Aluminium strip with high content of manganese and magnesium
SUBSTANCE: invention relates to an aluminium alloy for making substrates for offset printing plates. The aluminium alloy contains the following components in wt %: 0.2% ≤ Fe≤0.5%, 0.41% ≤ Mg ≤ 0.7%, 0.05% ≤ Si ≤ 0.25%, 0.31% ≤ Mn ≤0.6%, Cu ≤0.04%, Ti ≤ 0.05%, Zn ≤ 0.05%, Cr ≤ 0.01%, the balance - Al and inevitable impurities, each present in an amount of not more than 0.05%, and making up at most 0.15%, overall.
EFFECT: aluminium alloy and an aluminium strip made from an aluminium alloy which is suitable for making substrates for printing plates, having high fatigue resistance when bent across the direction of rotation and high thermal stability without reducing granulation capacity.
7 cl, 4 tbl, 2 dwg
The invention relates to an aluminum alloy for the production of substrates for offset printing plates, and aluminum tape, obtained from aluminum alloy, to a method of manufacturing aluminum tape and its use for the production of substrates for offset printing plates.
Aluminum tape for the production of substrates for offset printing plates must be of very high quality, and in this regard they are constantly improving. Aluminum tape must comply with a comprehensive set of properties. Thus, during the production of substrates for offset printing plates aluminum tape is subjected to electrochemical graining, the process of granulation should provide unstructured appearance without the effect of the bands at the maximum processing speed. The purpose of testing those patterns aluminum tape is to provide the opportunity for continuous deposition on a substrate of the printing form photosensitive layers, which are then illuminate. Photosensitive layers burn at a temperature of from 220°C to 300°C over a period of time from 3 to 10 minutes Typical combinations of time and temperature of burning are, for example, 240°C for 10 min or 280°C for 4 minutes in Addition, the substrate of the printed form should be user-friendly, i.e. to a substrate for a printed f the RM can be clamped in a printing device. Therefore, the softening of the substrate for printed forms after burning should not be too pronounced. The maximum tensile strength to the process of burning can guarantee that the tensile strength after burning will be quite high. However, the high tensile strength to the process of burning prevents the alignment of the aluminum strip, i.e. the elimination of deformation of the roll of aluminum tape before processing for forming substrates for printed forms. In addition, increasingly used printing machines with a maximum size of printing elements, and therefore, the substrate for printed forms should not hold along the direction of rotation and transversely of the direction of rotation to create a very large print. This means that more importance is the fatigue strength in bending of the substrate for printed forms across the direction of rotation. To optimize the properties of aluminum tape in terms of its ability to graining, its heat resistance, mechanical properties before and after burning and fatigue resistance in bending along the direction of rotation, was based on tape for the production of substrates for offset printing plates, which can be characterized by the ability to graining in combination with high fatigue resistance at of the IBE along the direction of rotation and sufficient thermal stability known from European patent EP 1065071 B1, which belongs to the applicant. Due to the increase in size of printing machines and the resulting requirements increase substrate for printed forms, the question arose about the need to improve the properties of aluminum alloys and made of them substrates for printed forms in terms of softening in the direction transverse to the direction of rotation, in the absence of a negative impact on the ability of aluminum tape to the grain size.
From international application WO 2007/045676, which was also filed by the applicant, also known Association of its high iron content: 0.4 wt.% up to 1 wt.% with a relatively high content of manganese and magnesium content up to 0.3 wt.%. When using this aluminum alloy can improve thermal stability and fatigue resistance in bending along the direction of rotation after burning. However, earlier it was considered that, in particular, the content of manganese and magnesium in the amount of more than 0.3 wt.% represents a challenge to the ability of the aluminum alloy to the grain size.
In this regard, the aim of the present invention is to provide aluminum alloy and aluminum tape, which is suitable for the production of substrates for printing plates and has a higher fatigue resistance when bending the Pope is the EC of the direction of rotation and greater thermal stability without compromising the ability to graining. Thus the present invention solves the problem of creating a method for the manufacture of aluminum tape, which is particularly well adapted to the production of substrates for offset printing plates, designed to clamp in the transverse direction.
According to the first disclosure of the present invention described above, the objective of creating aluminum alloy for the production of substrates for offset printing plates is achieved by the fact that the aluminum alloy contains the following components in wt.%:
0,2% ≤ Fe ≤ 0,5%,
0,11% ≤ Mg ≤ 0,7%,
0,05% ≤ Si ≤ 0,25%,
0,31% ≤ Mn ≤ 0,6%,
Si ≤ 0,04%,
Ti ≤ 0,1%,
Zn ≤ 0,1%,
Cr ≤ 0,1%,
the rest of Al and unavoidable impurities, each of which is present in an amount of not more than 0.05%, and overall, they represent a maximum of 0.15%.
Unlike aluminum alloys previously used for the production of substrates for offset printing plates, which generally contain very small fractions of manganese and magnesium, aluminum alloy according to the invention combines the high manganese content of at least 0.31 wt.% with a relatively high magnesium content of from 0.1 to 0.7 wt.%. In the result, it was found that the aluminum alloy according to the invention not only has very good fatigue resistance when bending transversely of the direction of rotation by combining high content of manganese and m is fester. Due to the excellent thermal stability of the substrate for printing forms, made of aluminum alloy according to the invention, user friendly, and especially high process reliability in terms of providing the mechanical properties before and after burning. Despite the high content of manganese and magnesium, contrary to expectation, the experts found no problems in terms of their ability to graining.
Good behavior when the grain size is also caused by silicon, which is contained in the aluminum alloy according to the invention in quantities of from 0.05 wt.% to 0.25 wt.%. When the electrochemical graining or etching the Si content provides a number of fairly deep recesses, to ensure optimal absorption of the light-sensitive varnish.
The copper content should be limited to a maximum of 0.04 wt.% to prevent the occurrence of inhomogeneous structures during the process of granulation. Titanium, which is injected into the aluminum alloy to reduce grains in the melt, creates problems when the grain size with high content of more than 0.1 wt.%. The level of zinc and chromium has a negative effect on the granulation, and, therefore, they must be present in an amount of not more than 0.1 wt.%.
According to the first implementation of the aluminum alloy p the invention thermal stability of the aluminum alloy can be further improved if aluminum alloy will contain the MP number, wt.%:
0.5 wt.%≤MP≤0.6 wt.%.
It was found that the higher manganese content not only leads to a further increase of thermal stability, i.e. less softening after burning, but at the same time stabilizes the fatigue resistance when bending transversely of the direction of rotation in relation to the selected mode of production. This effect is particularly pronounced when the manganese content of 0.5 wt.% to 0.6 wt.%.
According to the following implementation of the aluminum alloy according to the invention the content of Mg in the above-mentioned alloy is in wt.%:
and thus, the fatigue strength in bending transversely of the direction of rotation can be further enhanced. At higher manganese content, for example at least 0.5 wt.%, or a combination of manganese with magnesium from a magnesium content of at least 0.5 wt.% found no problems in terms of their ability to electrochemical graining of aluminum tape, made of a suitable aluminum alloy.
As mentioned, Ti, Zn and CR can affect the result of granulation and, in principle, can lead to the effect of the stripes on the aluminum tape. Thus, the aluminum alloy according to the invention can be additionally the luchsen in terms of process reliability when graining and therefore, in terms of its use for substrates for printed forms, if the aluminum alloy contains the following alloy components in wt.%:
According to the second disclosure of the present invention described above, the goal of aluminum tape for the manufacture of substrates for offset printing plates comprising an aluminum alloy according to the invention, with the thickness of 0.15 mm to 0.5 mm Aluminum tape according to the invention is characterized by not only an excellent ability to grain size, but ensures optimal ease of use with respect to the use of very large printing devices with a clamp across the substrates for printing plates due to the very good thermal stability at a moderate tensile strength. Most importantly, this is complemented by excellent fatigue resistance of aluminium strip according to the invention when bending transversely of the direction of rotation.
According to the following implementation of the aluminum strip according to the invention after the process of burning out at a temperature of 280°C for 4 min said tape has a tensile strength Rm of more than 150 MPa, the nominal yield strength Rp 0.2 of more than 140 MPa and fatigue resistance when bending transversely of the direction of rotation of at least 1950 cycles test results of fatigue in bending. Because aluminum Les is that according to the invention has very good thermal stability, using the traditional method, you can adjust the parameters of tensile strength to the process of burning so that they were in perfect technological range, for example, to allow to adjust the residual deformation of the roll and at the same time guaranteed the convenience of use and stability when used in very large print devices.
Due to the above described combination of properties of aluminum alloy and is made of an aluminum tape, according to the third disclosure of the present invention the above objective is also reached by the application of the aluminum strip according to the invention for the manufacture of substrates for offset printing plates.
And finally, according to a fourth disclosure of the present invention mentioned above the goal of reaching a method of manufacturing aluminum tape substrates for offset printing plates comprising an aluminum alloy according to the invention consists in the fact that the cast rolled ingot, rolled ingot optional homogenized at a temperature of from 450°C to 610°C, rolled ingot is subjected to hot rolling to a thickness of from 2 to 9 mm, hot-rolled strip is subjected to cold rolling with intermediate annealing or without it to the final thickness of 0.15 mm to 0.5 mm, Process intermediate annealing, if this Prohm is filling the annealing is carried out, carry out so that the subsequent process of cold rolling to the final thickness was set the required final strength aluminum tape in the final laminated state.
Intermediate annealing is preferably carried out at an intermediate thickness of from 0.5 to 2.8 mm, with intermediate annealing performed in a roll or in a continuous annealing furnace at a temperature of from 230°C. to 470°C. as a result of this intermediate annealing ultimate strength of aluminium strip in the final laminated condition can be adjusted depending on the thickness of the tape at which carry out intermediate annealing. The final annealing process preferably can be omitted to reduce production costs to a minimum level.
Thanks to the aluminium alloy according to the invention in combination with the described settings fatigue resistance when bending transversely of the direction of rotation is very high, and with the softening of the aluminum strip, caused by compulsory process of burning is reduced. As a result, may be made of a substrate for a printed form by the method according to the invention, which in addition to excellent ability to graining also combine properties excellent thermal stability and high fatigue resistance when bending transversely of the direction of rotation.
Due to this, there are lots of packages is her production and improvement of the aluminum alloy according to the invention, aluminum strip according to the invention, its use and method of manufacturing aluminum tape. For this purpose, references were made to the clauses, dependent clauses 1, 6, and 9, and on the way of performing in conjunction with the figure.
The only Fig. shows a schematic view in section of the device used to determine fatigue in bending.
In table 1, below, shows the composition of the reference aluminum alloy Ref and aluminum alloys according to the invention 15, 16 and 17, which were also investigated. The composition indices in table 1 are given in wt.%.
Alloys 15, 16 and 17 according to the invention had a much higher manganese content of 0.5 wt.% in comparison with the reference aluminum alloy. The Mg content was varied from 0.2 wt.% to 0.6 wt.%. Rolled ingots were cast from aluminum alloys of these compositions. Then rolled the ingot is homogenized at a temperature of from 450°C to 610°C and subjected to hot rolling to a thickness of hot tape 4 mm Cold rolling to a final thickness of 0.3 mm was carried out as with intermediate annealing, and without it, the intermediate annealing was carried out at a tape thickness of 0.9 to 1.2 mm, preferably of 1.1 mm At intermediate annealing used two temperature range, more specifically from 300°C to 350°C and 400°C to 450°C.
Aluminum tape, izgotovlennoe in accordance with the above-described method, were subjected to electrochemical graining to study the suitability for the production of substrates for printed forms. Unexpectedly and contrary to the expectations of experts there was no evidence of any effect of the bands after the granulation process, even at relatively high content of magnesium and manganese in the aluminum alloys according to the invention. Therefore, all aluminum alloys according to the invention are characterized by very good or good behavior graining. The results of the tests ability to grain size shown in table 2.
Table 3 shows the results of fatigue testing in bending, as well as related indicators thickness at the intermediate annealing and the temperature of intermediate annealing.
As is clear from table 3, the number of possible cycles of bending as in the final laminated state, and the state after living the project can be significantly increased compared with the reference alloy. At 2300 cycles minimum number of cycles of bending transversely of the direction of rotation in the state after a burn-in 1,8 times higher than that of the reference alloy. Thus, the aluminum alloy according to the invention is particularly well adapted for the production of substrates for very large printing plates, which are clamped in printing devices across the direction of rotation.
Increased thermal stability is also ensured due to the high manganese content, which more specifically is manifested in higher rates of tensile strength and conditional yield strength. Mechanical properties of specimens of the alloys are given in table 4. They were measured in accordance with EN standard.
|Burning at 280°C/4 min, when measured along the direction|
|The number of trials||Rp 0.2 (MPa)||Rm (MPa)|
The effect of intermediate annealing on the performance of Rm and Rp 0.2 obvious. The highest tensile strength Rm and the conditional yield strength Rp 0.2 were identified during the tests 5.1, 6.1 and 7.1. It should be associated with the manufacture of tapes without intermediate annealing. Intermediate annealing at 0.9 mm - 1.2 mm, preferably at 1.1 mm gave moderate rates of tensile strength and conditional yield strength after burning, while these rates again decreased with increasing temperature intermediate annealing, which demonstrate practical examples 5.3, 6.3 and 7.3.
All measured values of the tensile strength Rm and the conditional yield strength RP 0.2 aluminum is th tape according to the invention is significantly higher than the previously obtained parameters for the reference alloy during the test R while for intermediate annealing was chosen smaller thickness of the aluminum strip according to the invention at the same temperature intermediate annealing.
On figa shows a schematic view of the device for measuring fatigue in bending 1, which was used to determine the number of possible cycles of fatigue testing in bending. The device 1 for determining fatigue bending consists of rolling segment 3, which is located at a fixed segment 4 so that the segment 3 moves back and forth during the fatigue tests in bending by rolling on a fixed segment 4, and thus, a fixed sample 2 is subjected to bending at right angles to the stretching of the sample, fig.1b. To study fatigue in bending transversely of the direction of rotation to cut a sample of the aluminum strip according to the invention only transversely of the direction of rotation and clamp device for determining fatigue bending 1. The radius of the segments 3, 4 is 30 mm Measure the number of cycles of bending, and the cycle of bending ends at segment 3 to the original position.
The measurement of fatigue in bending of the alloys according to the invention clearly showed that, in General, the number of cycles of bending can be increased with increasing content of manganese and magnesium, with a record number of cycles of bending to rastreskivaniyu was also achieved without intermediate annealing. More specifically, the number of cycles of bending an intermediate annealing in the final laminated state was largely close to the number of cycles of bending of the sample with high content of manganese and magnesium in the state after burning. In this respect, one can observe a positive effect of the content of manganese and magnesium on the mechanical properties of aluminium strip according to the invention.
1. The substrate for offset printing plates comprising an aluminum alloy, characterized in that the aluminum alloy contains the following components in wt.%:
0,2% ≤ Fe ≤ 0,5%,
0,41% ≤ Mg ≤ 0,7%,
0,05% ≤ Si ≤ 0,25%,
0,31% ≤ Mn ≤ 0,6%,
Si ≤ 0,04%,
Ti ≤ 0,05%,
Zn ≤ 0,05%,
Cr ≤ 0,01%,
Al and inevitable impurities - other, with each of the impurities is present in an amount of not more than 0.05%, and overall, they represent a maximum of 0.15%, and after burning at a temperature of 280°C for 4 min, the substrate has a tensile strength Rm of more than 150 MPa, the nominal yield strength Rp 0,2 more than 140 MPa, and fatigue resistance when bending transversely of the direction of rotation of at least 1950 cycles test results of fatigue in bending.
2. The substrate for offset printing plates according to claim 1, characterized in that the aluminum alloy contains MP in number, wt.%:
3. The substrate for offset printing plates according to claim 1 or 2, characterized arisugawa fact,
that the aluminum alloy contains Mg in an amount, wt.%:
of 0.5%<Mg≤0.7 percent.
4. The substrate for offset printing plates according to claim 1 or 2, characterized in that the substrate has a thickness of from 0.15 mm to 0.5 mm
5. The substrate for offset printing plates according to claim 3, characterized in that the substrate has a thickness of from 0.15 mm to 0.5 mm
6. A method of manufacturing aluminum tape substrates for offset printing plates according to any one of items 1 to 5, in which cast rolled ingot, rolled ingot optional homogenized at a temperature of from 450°C to 610°C, subjected to hot rolling to a thickness of from 2 to 9 mm, and hot-rolled strip is subjected to cold rolling with intermediate annealing or without it to the final thickness of 0.15 mm to 0.5 mm
7. The method according to claim 6, characterized in that the intermediate annealing is carried out at an intermediate thickness of from 0.5 to 2.8 mm, preferably from 0.9 to 1.2 mm, and implement it in a roll or in a continuous annealing furnace at a temperature of from 230°C. to 470°C.
SUBSTANCE: in compliance with proposed method of rolling thin bands from aluminium Al-Mg or Al-Mg-Mn system alloys fully recrystallised hot-rolled band blank is subjected to rolling. Band blank features cubic texture and depth 9-10 times larger than band final depth. Rolling causes 45-47% reduction at every of two last passes at deformation rate of at least 10 m/s and band coiling temperature of 140-160°C, coil weight making at least 8 t.
EFFECT: higher metal ductility, decreased scatter of mechanical properties.
SUBSTANCE: alloy contains, wt %: 3.5-4.5 zinc, 3.5-4.5 magnesium, 0.6-1.0 copper, 2.0-3.0 nickel, 0.25-0.3 zirconium, aluminium - balance, at the same time after strengthening thermal treatment the alloy has yield point of 570 MPa, strength limit of 600 MPa, hardness of 160 HY, and after deformation at 440-480°C with speed of 0.001-0.01 1/s the alloy has elongation of more than 500%.
EFFECT: production of alloy with equiaxial homogeneous fine-grain structure.
SUBSTANCE: aluminium-based alloy with lower density is designed for making deformed semi-finished products, including sheets used in aircraft building. The alloy contains the following components, wt %: magnesium 4.2-5.0; zinc 3,2-3.9; copper 0.4-1.0; scandium 0.17-0.30; zirconium 0.07-0.14; titanium 0.01-0.05; berillium 0.0001-0.005; hydrogen 0.05-0.35 cm3/100 g of metal; manganese < 0.25; chrome <0.10; iron <0.30; silicon <0.20; aluminium - balance, with the ratio of magnesium content and zinc content - 1.3. The method for processing of alloy includes homogenisation is carried out at 400-430°C for 6-15 hours, hot deformation - at temperature of 380-430°C, and cold deformation to the final size - at the total extent of hot and cold deformation of less than 80%.
EFFECT: alloy has higher strength in combination with lower density.
2 cl, 5 tbl
SUBSTANCE: method involves casting of an ingot and obtaining of workpiece from it using equal-channel annular pressing with back pressure. Reduction of duration of shape-generating operations performed in the mode of high-speed superplasticity, as well as reduction of the workpiece heating time is provided due to the fact that prior to the ingot casting, the molten metal is heated up to 760-800°C and exposed at that temperature during 0.5-1.0 h; ingot is cast by means of semi-continuous casting to sliding crystalliser; cast ingot is annealed at temperature of 360-380°C during 3-8 h; workpiece of rectangular section, which is square in plan view, is obtained from ingot with ratio of thickness to width of 0.17 to 0.33; deformation of workpiece obtained from the ingot by pressing is performed at crossing angle channels of 90° at temperature of 305-325°C with number of passes of 4 to 8, which corresponds to true deformation of ~4 to ~8, with back pressure value equal to 30-40% of the value of applied pressure, with rotation of workpiece after each pass through 90° relative to the axis perpendicular to large edge of workpiece and passing through the centre of workpiece; then, workpiece is subject to rolling at temperature of previous pressing with total swaging of 80-95% at temperature of working rolls of rolling mill, which is equal to rolling temperature.
EFFECT: optimisation of superplastic shaping process of products of irregular shape.
1 tbl, 1 ex
SUBSTANCE: plate of 10 mm thickness or larger from aluminium alloy features higher durability. Note here that said aluminium alloy has the following chemical composition with the following components, in wt %: Mg 4.0-6.0, Mn 0.2-1.4, Zn not over 0.9, Zr < 0.3, Cr < 0.3, Sc < 0.5, Ti < 0.3, Fe < 0.5, Si < 0.45, Ag < 0.4, Cu < 0.25, other elements and unavoidable impurities of each aforesaid element - <0.05, sum - <0.20, aluminium making the rest. Plate features elongation in L direction exceeding 10% and tensile strength making, t least, 330 MPa. Proposed plate is produced by casting, preheating and/or homogenising, hot rolling, first cold forming, annealing at less than 350°C, and second cold forming.
EFFECT: higher resistance to kinetic projectiles, better formability.
27 cl, 3 dwg, 2 tbl, 2 ex
SUBSTANCE: melt is overheated to a temperature of 760-800 °C with an exposure of 0.5-1.0 h, a billet is cast by continuous casting into the slide mould, the billet is annealed at a temperature of 360-380 °C for 3-8 h, production of a rectangular billet out of a square bar in the ratio of thickness to width ratio from 0.17 to 0.33. This is followed by deformation resulting from a bar of the billet using equal-channel angular pressing at an angle of channels intersection of 90 °C at a temperature of 305-325 °C with the number of passes of 8 to 10, which corresponds to a true deformation of 8 to 10, with back pressure equal to 40-50% of the applied pressure, and rotating the billet after each pass per 90 ° about the axis perpendicular to a bigger face of the billet, and passing through the centre of the billet. After the deformation of the billet using an equal channel angular pressing, cold rolling is carried out with a total compression of 75-80%, or cold rolling with a combined compression 80-95% followed by annealing at a temperature of 305-335 °C for 0.5-1.0 h with cooling to room temperature with a rate of 15-35 °C/h.
EFFECT: deformed billets with high mechanical strength while maintaining flexibility.
1 tbl, 1 ex
SUBSTANCE: there is received constructional material from alloy on the basis of aluminium, containing components at following ratios, wt %: magnesium 10.50-15.50, manganese 0.05-0.10, zirconium 0.01-0.15, titanium 0.09-0.15, silicon and iron not more than 0.08, aluminium is the rest. Crystallisation of melt is implemented in rotary crystalliser at gravitation coefficient, equal to 180-250, during time of melt existence, equal to 12-15 s/kg, and cooling rate not higher than 5°C/s. Ingot is thermal treated and rolled. At first it is heated during 2-4 hours at temperature 340-380°C, then at that temperature is implemented its hot rolling up to thickness 4-8 mm at a degree of deformation in each cycle up to 30% and final temperature of semi-finished rolled products in the range 310-330°C. Then it is implemented cold rolling of semi-finished rolled products at a degree of deformation in each cycle up to 50% with intermediate softening during 0.5-2.0 hours at tempearture 310-390°C up to required thickness 0.5-2.0 mm and it is implemented finish annealing of rolling during 5-40 minutes at temperature 400-450°C.
EFFECT: increased durability, plasticity and manufacturability of rolling.
2 dwg, 2 cl
FIELD: metallurgy industry.
SUBSTANCE: invention refers to metallurgy, and namely to methods of producing superductile plates from aluminium alloys of aluminium-magnesium-lithium system, and can be used for superductile moulding of complex-shaped parts, as well as structural material when producing extruded sections. From an ingot there made is a half-finished article in the form of a cylinder. Hardening is carried out at 460±10°C during 0.5 hour. After that the half-finished article is extruded in intersecting channels with diameter corresponding to diameter of half-finished article deformed with a shear at the temperature of 300-400°C with accumulated deformation degree e=10. Rolling is carried out at the temperature of 330-370°C.
EFFECT: producing plates with high homogeneity of mechanical properties and improved superductility indices at low temperatures and high metal flow rates.
1 tbl, 1 ex
SUBSTANCE: said utility invention relates to Al-Zn-Mg alloys, namely, to alloys for welded structures, such as structures used in marine construction, during manufacture of car and industrial vehicle bodies, and stationary or movable tanks. The method involves manufacture of a plate using semi-continuous casting. The plate is made of an alloy containing, % weight: Mg 0.5-2.0, Mn < 1.0, Zn 3.0-9.0, Si < 0.50, Fe < 0.50, Cu < 0.50, Ti < 0.15, Zr < 0.20, Cr < 0.50, aluminium with its inevitable impurities being the remaining, Zn/Mg > 1.7. After that, the plate is subjected to homogenisation and/or reheating at a temperature T1 selected so that 500°C ≤T1≤(Ts-20°C) where Ts is the alloy burning temperature. The first hot rolling stage includes one or several rolling passes on a hot-rolling mill, the input temperature T2 is selected so that (T1-60°C)≤T2≤ (T1-5°C), and the rolling process is performed in such a way that the output final temperature T3 would be so that (T1-150°C)≤T3≤(T1-30°C) and T3 < T2. The strip produced at the said first hot rolling stage is rapidly cooled to the temperature T4. The second stage of hot rolling of the said strip is performed at the input temperature T5 selected so that T5≤T4 and 200°C≤T5≤300°C. The rolling process is performed in such a way that the coiling temperature T6 would be so that (T5-150°C)≤T6≤(T5-20°C).
EFFECT: enhancement of balance between mechanical properties and corrosion resistance of base metal and welded joint using simplest and most reliable method.
34 cl, 8 dwg, 20 tbl, 10 ex
FIELD: foundry and rolling processes.
SUBSTANCE: structural material contains following components, wt %: magnesium 9.0-11.0, zirconium 0.15-0.2, cobalt 0.01-0.001, beryllium 0.001-0.02, boron 0.005-0.007, aluminum - the balance. Crystallization of melt is carried out in rotary crystallizer at gravitation coefficient 220-250 and melt lifetime 12-15 sec/kg. Ingot is first heated for 2-4 h at 340-380° C and then subjected to hot rolling at that temperature until thickness 4-8 mm is attained at deformation rate up to 30% in each cycle and final rolling temperature 310-330° C. Thereafter, cold rolling is effected with deformation rate up to 50% in each cycle and intermediate annealings for 0.5-2.0 h at 310-390° C until required thickness 0.5-2.0 mm is attained followed by final annealing of rolled metal for 5-40 min at 400-450° C.
EFFECT: increased strength, plasticity, and processability of aluminum-based alloy with 9-11% magnesium.
2 cl, 2 dwg, 1 tbl
SUBSTANCE: invention relates to the method for manufacturing of a strip, made of alloy of Al-Mg-Si, in which a bar for rolling is cast from alloy Al-Mg-Si, exposed to homogenisation, the bar for rolling heated to temperature of hot rolling, is exposed to hot rolling and then, if required, cold rolling to its final thickness, at the same time the hot strip has temperature of not more than 130°C directly at the outlet from the last stage of hot rolling, preferably the temperature of not higher than 100°C, afterwards the strip is wound at this or lower temperature.
EFFECT: method makes it possible to perform aluminium strips from alloy Al-Mg-Si, which have higher relative extension and accordingly higher extents of deformation when structural metal sheets are made.
15 cl, 5 tbl, 4 dwg
SUBSTANCE: composite material contains copper, manganese, zirconium, iron, silicon and boron, and has a structure consisting of solid aluminium solution and phases uniformly distributed in it at their further ratio in solid solution, wt %: 6-15 B4C, 2-6 Al15(Fe,Mn)3Si2, 2-6 Al20Cu2Mn3, 0.4-0.8 Al3Zr.
EFFECT: increasing heat resistance of material to heating processes at sufficient level of mechanical properties.
2 cl, 1 tbl, 5 ex
SUBSTANCE: magnesium-containing high-silica aluminium alloys intended for use as structural materials, including shapes, bars, sheets and forged pieces, are manufactured with the help of a technological process containing the following operations: ingot casting from the alloy by method of casting into a chill mould, preliminary heating of the ingot in order to disperse particles of eutectic phase of silicon, treatment in thermoplastic condition and thermal treatment in order to produce an item of final shape and with modified microstructure. Aluminium alloys contain, wt %: 0.2-2 of magnesium and 8-18 of silicon and have homogeneous and fine-grained microstructure, at the same time the aluminium matrix is homaxonic with the average size of grain, not exceeding 6 mcm, and particles of silicon and secondary phase are dispersed at the average size of particles not exceeding 5 mcm. Without addition of any modifiers they are produced with low costs by combination of casting into a chill mould with treatment in thermoplastic condition and thermal treatment.
EFFECT: high plasticity and relatively high strength.
8 cl, 13 dwg, 10 tbl, 1 ex
SUBSTANCE: aluminium alloy contains the following components: from 4.5 to 6.5 wt % magnesium, from 1.0 to 3.0% wt % silicon, from 0.3 to 1.0% wt % manganese, from 0.02 to 0.3% wt % chromium, from 0.02 to 0.2% wt % titanium, from 0.02 to 0.2 wt % zirconium, from 0.0050 to 1.6% wt % of one or more rare-earth metals, max. 0.2% iron, and the rest is aluminium.
EFFECT: alloy has high strength properties and is intended for use in die casting and related methods.
8 cl, 1 tbl
SUBSTANCE: aluminium-based alloy contains the following, wt %: zinc - 6.35 - 8.0, magnesium - 0.5 - 2.5, copper - 0.8 -1.3, iron - 0.02 - 0.25, silicon - 0.01 - 0.20, zirconium - 0.07 - 0.20, manganese - 0.001 - 0.1, chrome - 0.001 - 0.05, titanium - 0.01 - 0.10, boron - 0.0002 -0.008, beryllium - 0.0001 - 0.05, at least one element from potassium, sodium, calcium group in quantity of 0.0001 - 0.01 each, aluminium is the rest; at total content of zinc, magnesium, copper within 8.5-11.0, and that of zirconium, manganese and chrome - within 0.1-0.35. Method involves loading and melting of charge components, flux treatment of molten metal, molten metal purification, further vacuum treatment of molten metal in mixer and casting of ingots; boron is added to molten metal in the form of Al-Ti-Be alloy which is distributed at least one hour before molten metal pouring to mixer along the whole surface area of mixer bottom; at that, mixer is pre-heated to temperature which is by 15-30°C more than molten metal temperature, and vacuum treatment of molten metal in mixer is performed at temperature of 695-720°C, during 45-90 minutes.
EFFECT: invention allows obtaining high-strength aluminium alloys with absence of primary intermetallic compounds, decreased content in them of non-metallic inclusions and dissolved gases, with stable properties and optimum size of grain on basis of standard furnace and process equipment.
2 cl, 3 tbl
SUBSTANCE: Invention relates to metallurgy and may be sued in producing strained semi-finished products from thermally non-hardenable welded aluminium-based alloys used as structural and semiconductor material, primarily, in aerospace and nuclear engineering. Aluminium-base alloy comprises the following components in wt %: magnesium - 1.8-2.4, scandium - 0.2-0.4, zirconium - 0,1-0.2, cerium - 0.0001-0.005, iron - 0.01-0.15, silicon - 0.01-0.1, aluminium making the rest. Note here that iron-to-silicon content ratio may not be less than unity.
EFFECT: higher strength and conductivity, hence, reduced weight.
2 tbl, 1 ex
SUBSTANCE: invention refers to deformed thermally hardened high-tensile aluminium alloys Al-Zn-Mg-Cu designed for fabrication of all kinds of deformed semi-finished products, including thin sheets used in aircraft and machine engineering and other branches of industry. Deformed alloy on base of aluminium and an item out of it contain the following components, wt %: zinc 2.5-4.0, magnesium 4.1-6.5, copper 0.2-1.0, iron to 0.25, silicon to 0.15, scandium 0.005-0.3, zirconium 0.005-0.25, nickel and/or cobalt to 0.1, titanium to 0.15, boron and/or carbon to 0.05, at least one element out of group: hafnium to 0.15, molybdenum to 0.15, cerium to 0.15, manganese to 0.5, chromium to 0.28, yttrium to 0.15, vanadium to 0.15, niobium to 0.15, aluminium and unavoidable impurities - the rest, also ratio of Mg contents to Zn contents is more or equal to 1.1.
EFFECT: production of alloy and items out of it possessing raised strength properties at simultaneous increased wear-resistance, reduced rate of crack growth, increased durability of welded connections and reduced density, which results in increased resource and reliability of items operation and in reduced weight of structures.
3 cl, 2 tbl, 1 ex
SUBSTANCE: alloy contains following components, wt %: magnesium 4.1-4.9, titanium 0.01-0.04, beryllium 0.0001-0.005, zirconium 0.05-0.12, scandium 0.17-0.30, cerium 0.0001-0.0009, manganese 0.19-0.35, chromium 0.01-0.05, group of elements, containing iron and silicon 0.06-0.25, aluminium is the rest, at that value of iron content relation to silicon content has to be not less than unity.
EFFECT: increased strength property, strength of welded connection at cryogenic temperatures, weight saving of welded fabrication, manufactured from suggested alloy.
2 tbl, 1 ex
FIELD: metallurgy; alloys.
SUBSTANCE: alloy and products out of this alloy contain the following elements, mas.% magnesium 0.6-1.2; silicon 0.6-1.2; manganese 0.3-1.0; iron 0.1-0.5; copper 0.05-1.0; titanium 0.005-0.05; at least one element out of the group: tin 0.6-1.0; bismuth 0.2-0.8; at least one element of the group: gallium 0.001-0.05; calcium 0.001-0.05; at least one element from the group: boron 0.0005-0.005; carbon 0.0001-0.005; aluminium - the rest.
EFFECT: there obtained an alloy and products out of it not containing lead and possessing upgraded machinability, high corrosion resistance and strength.
2 cl, 4 dwg, 2 tbl, 1 ex
SUBSTANCE: said utility invention relates to the manufacture of products of a rolled aluminium alloy highly resistant to damage. The method involves casting an ingot with a chemical composition selected from the group consisting of AA2000, AA5000, AA6000, and AA7000 alloys, homogenisation and/or heating of the ingot after casting, hot rolling of the ingot into a hot-rolled product and, optionally, cold rolling of the hot-rolled product into a cold-rolled product. After the hot rolling, the hot-rolled product is cooled from the hot-rolling mill output temperature (Tout) to 150°C or lower, at a controlled cooling rate decreasing within the set range according to a continuous cooling curve determined using the following expression: T(t)=50-(50-Tout)eα-t, where T(t) is the cooling temperature (°C) as a function of the cooling time (hours), t is the cooling time (hours), and α is a parameter determining the cooling rate, within a range of -0.09±0.05 (hr-1).
EFFECT: enhanced impact strength; resistance to growth of fatigue cracks, and corrosion resistance without strength deterioration.
19 cl, 7 tbl, 1 dwg, 2 ex
SUBSTANCE: mixture of niobium and aluminium powders with fineness of not less than 98% and fraction of aluminium of 1.5 to 45 wt % is subject to mechanical processing in a planetary ball mill at amplification of balls of 100 to 600 m/s2 with duration of 0.5 to 20 minutes. Compaction by twisting under quasi-hydrostatic pressure on Bridgman anvils is performed at the temperature of 10 to 100°C, pressure of 2 to 10 GPa and relative turn of anvils at twisting till shear deformation γ≥50 is achieved.
EFFECT: obtained composite with a layered structure is characterised by a nanoscale size of grains and layers, increased hardness and large specific surface area of interphase boundaries.
3 dwg, 1 ex