Aluminium strip with high content of manganese and magnesium

FIELD: chemistry.

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.%:

0,5%≤Mg≤0,7%,

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.%:

Ti≤0,05%,

Zn≤0,05%,

Cr≤0,01%.

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 2
AlloyBehavior graining
Ref++
15++
16+
17+

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.

Table 4
Burning at 280°C/4 min, when measured along the direction
rotation
The number of trialsRp 0.2 (MPa)Rm (MPa)
R136145
5.1180193
5.2153170
5.3148164
6.1181192
6.2154170
6.3151169
7.1178193
7.2162182
7.3161179

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.%:
0,5%≤MP≤0,6%.

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.



 

Same patents:

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8 cl, 13 dwg, 10 tbl, 1 ex

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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

FIELD: metallurgy.

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

FIELD: metallurgy.

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

FIELD: metallurgy.

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

FIELD: metallurgy.

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

FIELD: metallurgy.

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

FIELD: metallurgy.

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

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