Method to produce cold-deformed pipes from double-phase alloys based on titanium

FIELD: metallurgy.

SUBSTANCE: method to manufacture cold-deformed pipes from double-phase alloys based on titanium includes ingot smelting, ingot forging in a β-area or β- and α+β-area with forging completion in the α+β-area into an intermediate blank with the specified forging reduction. The intermediate blank is produced with forging reduction of at least 1.35, a block is made from the intermediate blank, which is pressed into a billet and thermally treated at the temperature that is by 30°-40°C below the temperature of Tint, and them the billet is rolled with intermediate surface treatment, etching and thermal treatment. Drawing in process of rolling is defined using the following formula.

EFFECT: produced pipes are characterised by high physical-mechanical properties due to exclusion of formation of grain-to-grain microcracks.

4 tbl, 1 ex

 

The invention relates to pipe production, namely the production of high-strength pipes of two-phase alloys based on titanium, mostly from pseudo-α and (α+β)alloys. The invention can be used for the manufacture of responsible destination intended for operation in various fields of national economy, such as security guards geophysical instruments, actuators mechanization wing aircraft frame of the fuselage of the aircraft, hydraulic systems, etc.

Traditionally, two-phase alloys because of its high strength-tech mainly only when hot or warm deformation.

Known conventional method of forming titanium alloys, wherein pre-processing the workpiece - ingot produced in β and (α+β)-fields, and the final - (α+β)-area (see, for example, technology for the production of titanium aircraft structures / Aghbalyan, Bashlachev, VSO and others - M.: Mashinostroenie, 1995. - C-199).

A common drawback of these technologies is that when processing two-phase (α+β)-region even at low speeds and degrees of deformation of these alloys are formed grain boundary microcracks, uncontrolled UT and detectable only by microstructural analysis. They are the reason for the decline in physical-mehanicheskij properties of titanium alloys in which there are (α+β) phase (see, for example, the Collings E.V. Physical metallurgy of titanium alloys: TRANS. from English. Ed. by B. I. Verkin, Moskalenko V.A., M.: metallurgy, 1988. - S). Such physical phenomena characteristic of other multiphase alloys, in particular on the possibility of occurrence of such defects in 1947 warned Sigwin - "avoid uneven deformation and the appearance of significant additional stresses it is not recommended to prevent the deformation process of the phase change. The temperature of the end of the deformation must be taken at 20-30° above the line of change of phase state (see Siguin. Theory of metal forming. - M.: Metallurgizdat, 1947. - S-471). Therefore, the machining of titanium alloys in the final operations deformation at high temperatures in the (α+β)-region potentially reduces physical and mechanical properties of titanium alloys. Recommendations for final operations deformation of titanium alloys in the β-region can be applied with great assumptions due to the fact that there are prerequisites to the coarsening of the structure of titanium alloy.

A method of producing hot-rolled tubes from α and (α+β)alloys based on titanium, including the forging of the ingot to billet in the β-region or β - (α+β)-areas with the specified ukonom and then fur the systematic processing, getting checkers, deformation of the pipe in the (α+β)-field and heat treatment. The invention provides forming in the tubes of fine-grained microstructure with a high degree of homogeneity (RF Patent No. 2262401, IPC B21B 3/00, publ. 20.10.2005).

The method does not allow to fully realize the potential of pseudo-α - (α+β)alloys, as the final deformation is produced in the (α+β)-a region in the caliber of the rolls with releases that implement adverse diagram of stress-strain state, and the formation of grain-boundary cracks that impair physical and mechanical properties of alloys and limiting the permissible deformation during subsequent cold rolling of tubes.

A known method of manufacturing a hollow billets for the production of seamless pipes from pseudo - α and (α+β)-titanium alloys, including ingot smelting, forging ingot in the β-region or β - and α+β region with the end of the forging in the α+β region in the intermediate workpiece with a given ukonom (RF Patent No. 2127160, IPC B21B 3/00, publ. 10.03.1999) prototype.

The method does not take into account the physico-mechanical properties of alloys and does not guarantee during thermomechanical processing education in the original β-grain secondary α-plates in the workpiece, complicating the cold deformation of two-phase alloys.

The objective of the invention which is a method of obtaining cold-deformed pipes of two-phase titanium alloys with improved physical and mechanical properties of the metal.

The technical result achieved in the implementation of the invention is to provide a technology that allows for end-stage deformation manufacture titanium pipe without forming a grain boundary microcracks by cold rolling, the rolling is performed with a calculated value hoods to ensure deformation without failure.

This technical result is achieved in that in the method of manufacturing a cold-deformed pipes of two-phase alloys based on titanium, including ingot smelting, forging ingot in the β-region or β - and α+β region with the end of the forging in the α+β region in the intermediate workpiece with a given ukonom, intermediate billet get with ukonom not less than about 1.35, of the intermediate pieces produce a piece that is pressed into the tubular workpiece at a temperature not exceeding the temperature determined by the formula:

where Tn- heating temperature checkers before pressing. °C;

TPP- temperature polymorphic α↔β transformation, °C;

σs(Tn- the deformation resistance of the metal at the heating temperature, MPa;

lnµi- the natural logarithm of the real hoods during pressing;

C - specific heat of the metal, kJ/kg·°C;

ρ is the density of the metal, g/cm3,

then trubo the workpiece thermoablative at a temperature of 30-40°C below the temperature T PPand then effect the rolling of billets with an intermediate surface treatment, etching and heat treatment, with the hood when rolling is determined by the formula:

where µ - hood during cold rolling of tubes on the machines chorionic gonadotropin;

KCU - impact strength (kgf·m/cm2;

σof 0.2- yield strength, MPa;

K - factor of plasticity K=0,45-0,6.

The essence of the invention is as follows.

The first forging of the ingot in the intermediate workpiece at temperatures in β, (α+β)-region destroys the cast structure and allows you to pre-prepare the microstructure (grind grain), final UCAV not less than about 1.35 and regulated heating form in the piece with globular microstructure of α-phase for subsequent pressing her into the tubular workpiece at a temperature defined by the formula (1). The temperature is calculated taking into account the lowest possible temperature on the basis of physico-mechanical properties of the alloy, which ensure manufacturability of the pressing process and the maximum possible temperature, the excess of which will lead to the formation of the original β-grain secondary α-plates, complicating the cold deformation of two-phase alloys. Subsequent heat treatment at a temperature of 30-40°C below the temperature TPPSPO is obstet odnorodnosti mechanical properties of the workpiece and the removal of internal stresses. Cold rolling of tubes produced when the hood is defined by the formula (2), which guarantees deformation without fracture. If necessary, the pipe is subjected to subsequent procadam with intermediate anneals.

The possibility of carrying out the invention is illustrated by the example of manufacturing cold-rolled pipe size ⌀48×5 mm titanium (α+β)alloy Gr23 (Ti-6Al-4V ELI) Chemical composition of the alloy Gr23 are shown in table 1.

Table 1
Area selectionTiThe content of elements, %
AlVFeO2NH2Each impurityΣCR
Incore.5,984,00,0640,0750,0080,008<0,002<0,1 0,128
Ncore.5,904.09 to0,0690,0710,0060,007<0,002<0,10,129
The requirement of ASTM a 861core.5,5-6,53.5 to 4.5No more than
0,250,130,080,03of 0.01250,10,4

CCI=948°C

The required level of mechanical properties according to ASTM a 861:

the ultimate tensile strength ≥828 MPa (120ksi),

- yield strength (offset of 0.2%) at least 759 MPa (110ksi),

- elongation on 50 mm, not less than 10%.

The pipe was manufactured according to the following scheme:

1. Forging rod ⌀140×L mm according to the scheme: β, α+β, β, α+β (wkow≥3), the final UCAV 1,35.

2. Machining, fabrication billets checkers ⌀132×⌀58×37 mm

3. Heating to a temperature of 878°C, calculated by the formula (1):

4. Pressing billets in press 660 TC. size ⌀85×⌀57×14 mm

5. Annealing: CCI - 30° exposure 60 min, cooling the air.

6. Edit.

7. Machining size ⌀80×⌀60×10 mm

8. Pickling.

9. Annealing oxidation.

10. The first rolling mill HPT 90 size ⌀65×⌀52×6.5 mm, with hood, calculated by the formula (2).

11. Sandblasting, etching.

12. The annealing.

13. Edit, trim ends.

14. The second rolling mill chpt 3 ½ size ⌀48,2×⌀38×5.1 mm, with hood, calculated by the formula (2).

15. Sandblasting, etching.

16. The annealing.

17. Edit, etching, trimming ends, control.

Cold rolled pipe size ⌀48×5 mm alloy Gr23 supplied by the control tensile tests.

The results of the mechanical tests of hot-pressed heat-treated tube ⌀85×14 mm, after heat treatment (heating 918°C (TPP- 30°C), shutter speed 60 minutes, cooled air) are shown in table 2.

td align="center"> 797
Table 2
No. sampleYield strengthThe tensile strength ofRelates. extension Relates. narrowingImpact strength (KCU)
ksiMPaksiMPa%%kgf·m/cm2
1117,3809129, 9mm89616,846,58,1
2115,6797to 129.389216,446,28,3
3115,9799129,189016,441,57,8
max117,3809129, 9mm89616,846,58,3
min115,6129,189016,441,57,8
AVG. aifm.to 116.2801,7129,4892,716,544,78,1
ASTM a 861≥110≥759≥120≥828>10

The results of the mechanical tests of samples of finished pipe (delivery value) for $ ⌀48×5 mm alloy Gr23 are shown in table 3 and 4.

Table 3 - mechanical properties of cold-rolled pipe size ⌀48×5 mm, the state after heat treatment. Heat treatment regime: heating to 700°C, the shutter speed 60 minutes, the cooling air (heat treatment in a vacuum furnace).

Table 3
No. sampleYield strengthThe tensile strength ofOtnositel
ksiMPaksiMPa%
1126,9875146,61011the 11.6
ASTM B 861≥110≥759≥120≥828>10

Table 4 - mechanical properties of cold-rolled pipe size

⌀48×5 mm, the state after heat treatment. Heat treatment regime: heating to 700°C, the shutter speed 60 minutes, the cooling air (selection mode in the laboratory STC).

Table 4
No. sampleYield strengthThe tensile strength ofRelates. extension
ksiMPaksiMPa%
1 122,1842140,997210,3
2122,2843of 142.898510,2
max122,2843of 142.898510,3
min122,1842140,997210,2
AVG. aifm.122,2842,5141,9978,5of 10.25
ASTM B 861≥110≥759≥120≥828>10

Practical application of manufacturing cold-deformed pipes of two-phase alloys based on titanium, in particular the manufacture of pipes of alloy Gr23 showed the possibility of obtaining products with tailored mechanical properties. Process p is ocess stable, 10 running billets losses on marriage was not. Technology used the standard equipment.

A method of manufacturing a cold-deformed pipes of two-phase alloys based on titanium, including ingot smelting, forging ingot in the β-region or β - and α+β region with the end of the forging in the α+β region in the intermediate workpiece with a given ukonom, characterized in that the intermediate workpiece is received with ukonom not less than about 1.35, of the intermediate pieces made piece that is pressed into the tubular workpiece at a temperature not exceeding the temperature determined by the formula:

where Tn- heating temperature checkers before pressing, °C;
TPP- temperature polymorphic α↔β transformation, °C;
σs(Tn- the deformation resistance of the metal at the heating temperature, MPa;
lnµi- the natural logarithm of the real hoods during pressing;
c - specific heat of the metal, kJ/(kg·°C);
ρ is the density of the metal, g/cm3,
then round billet thermoablative at a temperature of 30-40°C below the temperature TPPand then effect the rolling of billets with an intermediate surface treatment, etching and heat treatment, with the hood when rolling is determined by the formula:

where µ is the latter the spacecraft during cold rolling of tubes on the machines chorionic gonadotropin;
KCU - impact strength (kgf·m/cm2;
σof 0.2- yield strength, MPa;
K - factor of plasticity, K=0,45-0,6.



 

Same patents:

FIELD: metallurgy.

SUBSTANCE: method is implemented by the surface treatment of parts made of heat resisting alloys with high-current pulsed electron beam with a pulse duration of 20-50 mcs, the electron energy of 110-120 keV, the energy density of 18-45 J/cm2 per pulse and number of pulses of 2.5, followed by a stabilising annealing in a vacuum at a pressure not exceeding 10-5 mm Hg for 2-6 hours.

EFFECT: increased exploitation parameters of the products.

2 ex, 6 tbl

FIELD: metallurgy.

SUBSTANCE: method for obtaining high-strength wire from (α+β)-titanium-based martensite alloy involves obtaining of ingot, its hot deformation so that workpiece for drawing is obtained; drawing at room temperature till final size is obtained, and final heat treatment. After heat treatment is completed, the obtained workpieces are annealed in the air and machined; drawing is performed for many times with intermediate annealings in the air environment; at that, the machining is performed after the first drawing pass, and final heat treatment is performed in the air environment during 60-180 minutes at temperature of (0.5÷0.7)TSL °C with further cooling to room temperature.

EFFECT: increasing ultimate tensile strength at maintaining the high level of relative elongation due to uniformity of the structure throughout the length and section of wire.

1 tbl, 2 ex

FIELD: metallurgy.

SUBSTANCE: method of thermomechanical treatment of items from titanium alloys involves thermomechanical treatment which is performed at twelve stages; at that, at the first stage there performed is heating to temperature of (Tpt+200÷Tpt+270)°C, deformation which involves four stages at cooling down to temperature of (Tpt+70÷Tpt-100)°C with change of deformation direction through 90° at alternation of shrinkage and drawing with deformation degree of 30÷60% at each stage; the second stage involves heating to temperature of (Tpt+120÷Tpt+170)°C, four stages of deformation at cooling down to the temperature of (Tpt-50÷Tpt-110)°C with the change of deformation direction through 90°C at alternation of shrinkage and drawing with deformation degree of 30-60% at each stage; the third stage involves heating up to temperature of (Tpt+20÷Tpt+70)°C, four stages of deformation at cooling down to temperature of (Tpt-70÷Tpt-140)°C with the change of deformation direction through 90°C at alternation of shrinkage and drawing with deformation degree of 30÷60% at each stage; the fourth stage involves heating up to temperature of (Tpt-20÷Tpt-40)°C, deformation with degree of 15-60% at cooling down to temperature of (Tpt-100÷Tpt-140)°C; the fifth stage involves heating up to temperature of (Tpt+70÷Tpt+90)°C, deformation with degree of 30-60% at cooling down to temperature of (Tpt-40÷Tpt-90)°C; the sixth stage involves heating up to temperature of (Tpt-20÷Tpt-40)°C, deformation with degree of 20-40% during cooling down to the temperature of (Tpt-60÷Tpt-100)°C; the seventh stage involves heating up to temperature of (Tpt+20÷Tpt+50)°C, deformation with degree of 30-60%) during cooling down to temperature of (Tpt-40÷Tpt-70)°C; the eighth stage involves heating up to temperature of (Tpt-20÷Tpt-40)°C, deformation with degree of 20-60% during cooling down to temperature of (Tpt-60÷Tpt-100)°C; the ninth stage involves heating up to temperature of (Tpt+30÷Tpt+70)°C, deformation at rolling with degree of 40-70% during cooling down to the temperature of (Tpt-70÷Tpt-170)°C; the tenth stage involves heating up to temperature of (Tpt-20÷Tpt-40)°C, rolling deformation with degree of 30-50% during cooling down to the temperature of (Tpt-100÷Tpt-200)°C; the eleventh stage involves heating to temperature of (Tpt-70÷Tpt-170)°C with exposure during 15-60 minutes, air or water cooling; the twelfth stage involves heating up to temperature of (Tpt-270÷Tpt-470)°C with exposure during 5-15 hours, where Tpt - polymorphic transformation temperature; at that, deformation direction through 90° is changed from two to four times starting from the fourth stage and ending with the eighth stage.

EFFECT: method of thermomechanical treatment provides the use of titanium alloys at low temperatures and at high stresses at biaxial tension and allows improving its operating reliability.

2 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may be used in machine building, engine production, automotive industry, etc. Proposed method comprises multiple reiteration of upsetting-broaching operations on applying deforming force along three axes of orthogonal coordinate system of the workpiece at a time. Billet is broached to square and upset in die. Die has cylindrical cavity with axis of symmetry aligned with deforming force direction. Forming is executed in several cycles to reach accumulated deformation e>2 so that square diagonal does not exceed die cavity diameter after broaching. Tapered recesses are formed on end surfaces of workpiece being upset.

EFFECT: higher quality and efficiency.

4 dwg, 1 ex

FIELD: metallurgy.

SUBSTANCE: method for obtaining metal sheet (1) from zirconium-based alloy with Kerns factor close to 0.33 in the direction perpendicular to rolling direction, for manufacture of spacer grid. Metal sheet (1) has longitudinal axis A, transverse axis B, which determine the sheet plane (BA). Method involves a stage for obtaining sheet (2) from zirconium-based alloy; at that, sheet (2) is subject at least to one preparatory cold rolling and final cold rolling, which are carried out in one direction along longitudinal axis (A). Heat treatment of sheet (2) is performed between preparatory and final rolling so that partial recrystallisation of zirconium-based alloy with degree of not more than 90% is performed. Method for obtaining spacer grid (3) which restricts grid (5) cells for fuel rods. Cutting of sheet (1) into strips (4) is performed so that their longitudinal axes (B) are perpendicular to rolling direction. Strips (4) are arranged so that spacer grid (3) can be formed and so that longitudinal axes (B) of metal strips (4) are perpendicular to longitudinal direction (6) of grid cells (5).

EFFECT: slow growth at least in one direction is found out in metal sheet.

27 cl, 2 dwg

FIELD: metallurgy.

SUBSTANCE: treatment method of semi-finished products from TH-1 titanium nickelide by preliminary heat cycling at intervals of martensitic conversions in twisting mode is proposed. Heat cycling at intervals of martensic conversions is repeated until steady-state values of deformation responses are obtained; at that, semi-finished product is heated from martensitic state T= 295 K to austenitic state T= 500 K and cooled back to martensitic state.

EFFECT: obtaining deformation characteristics of stable effect of reversible deformation.

4 tbl

FIELD: metallurgy.

SUBSTANCE: treatment method of vanadium-based alloys of V-4Ti-4Cr system is proposed. Method involves homogenisation, thermal mechanical treatment and final stabilising annealing. After homogenisation is completed, ingots are heated to 850-1000°C with exposure at this temperature during 1.5-2 hours; extrusion with elongation ratio of 2-5 with further annealing at temperature exceeding the solubility temperature of secondary phases in vacuum of 10-4 Pa. First, thermal mechanical treatment is performed by means of deformation with deformation degree of 30% at room temperature with further annealing at temperature of 500-600°C, and then, by means of multiple pressing with change of deformation axis along three axes with deformation value of not less than 30% per pass, and final stabilising annealing is performed at 800-900°C.

EFFECT: improving high-temperature strength of vanadium-based alloys.

1 dwg, 1 tbl, 2 ex

FIELD: metallurgy.

SUBSTANCE: ingot is first produced to be subjected to thermomechanical treatment by heating at temperature some 150÷380°C higher than Tcp and to deformation to 40÷70%, heating to temperature some 60÷220°C higher than Tcp and deformation to 30÷60%, heating to some 20÷60°C below Tcp and deformation to 30÷60%. Then recrystallisation is performed by heating the ingot to temperature some 70÷140°C higher than Tcp and deformation to 20÷60% and cooling to room temperature. After heating to temperature some 20÷60°C below Tcp the billet is deformed to 30÷70% and subjected to additional recrystallisation by heating to temperature some 30÷110°C higher than Tcp and deformation to 15÷50% and cooling to room temperature. After heating to temperature some 20÷60°C below Tcp the billet is deformed to 50÷90% and subjected to final deformation.

EFFECT: higher precision, better stable mechanical properties.

4 cl, 3 tbl

FIELD: metallurgy.

SUBSTANCE: proposed method comprises primary fast heating, cold deformation, subsequent fast heating, another deformation cycle and heating, and final ageing. Optimisation of strength and plastic properties in both deformed and aged states is possible due to that primary fast heating to temperature higher than that of recrystallisation onset is performed by electric contact heating. Then, material is cooled (tempered) at cooling rate of 10-80°C/s. Subsequent cold drawing, intermitting with tempering, is performed with summed deformations between tempering making 25-49%. Final heating is performed to temperature below that of recrystallisation by 10-70°C. Thereafter, final drawing with deformation of 5-12% and ageing for 4-6 hours are performed.

EFFECT: higher operating properties of wire made thereby.

1 tbl, 3 ex

FIELD: metallurgy.

SUBSTANCE: method involves plastic deformation and thermomechanical processing. Plastic deformation of workpieces is performed at temperature below 300°C so that total deformation degree of 10-40% is provided; thermomechanical processing is performed by heating the workpieces to temperature which is lower than recrystallisation temperature by 10-250°C and deformation with deformation degree of not less than 50%, and then, cooling of workpieces is performed to temperature of 20-300°C and deformation with deformation degree of not less than 60% so that logarithmic deformation degree of not less than 1.7 is provided. After thermomechanical processing the annealing is performed at temperature below 350°C.

EFFECT: obtaining the alloy grain size of 250-80 nm without using any intensive plastic deformation at processing of large-sized workpieces from titanium alloys.

2 cl, 2 dwg, 2 ex

FIELD: process engineering.

SUBSTANCE: proposed device comprises, at least, one first reeler 1, 5 and one second reeler 20, and at least one reversing stand 8, 13 arranged between two said reelers 1, 5. It comprises also appropriate means 22, 23, 28 to transfer coils to and from coil transfer stations 24, 29. Besides it includes transverse transfer means 27 to transfer coils between said stations 24, 29, 30. Note here that, downstream of coil transfer station 24, 29, one common transfer means 25 is arranged to transfer coils to and from means 27.

EFFECT: higher efficiency of rolled coils transfer.

12 cl, 2 dwg

Mill stand // 2463119

FIELD: process engineering.

SUBSTANCE: mill stand comprises forming rolls, bearings, through pads, dead pads and adjusting screws. Mill stand rigidity in direction perpendicular to rolling direction is ensured by providing said stand with bearing plates with rolled strip passages, holes for bolts to fasten roll pads and adjusting screw supports to said plates and vertical cutouts for roll pads to displace therein. Note here that roll dead pads are provided with hollow nuts to adjust roll axial displacement and accommodate bearing thrust assemblies to retain rolls in axial adjustment.

EFFECT: reduced torsion of rolled stock.

4 dwg

FIELD: process engineering.

SUBSTANCE: invention is intended for making high-strength rolled sheet from aluminium alloys. Proposed method comprises making flat billet and lengthwise cold rolling to target thickness. Note here that cold rolling is performed at -80 to -196°C with total reduction of 35-99%. After rolling to thickness exceeding target thickness by 2.8-9.5 times, billet is turned through 90 degrees in rolling plane.

EFFECT: higher strength and toughness.

2 cl, 1 tbl

System of rolls // 2462323

FIELD: process engineering.

SUBSTANCE: rolls are arranged to de displaced axially by drives (4, 104, 204). Note here that the latter comprises, at least, one hydraulic cylinder (5, 6, 105, 106, 205) to control axial displacement of rolls. Proposed system comprises means (11, 12, 13, 14) to allow displacement of roll bearing holders (15, 16, 17, 18) perpendicular to axial direction A and in axial direction by rotary motion. Hydraulic cylinder is arranged in frame mounted spatially fixed or moving coupled with device elements.

EFFECT: simplified design.

2 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: proposed system serves to define parameters describing identity and/or in-service state of forming roll to be replaced and is provided with, at least, one sensor device fitted on said roll to memorise said parameters.Said device allows registration of parameters describing identity of forming roll being replaced. System incorporates also a reader to allow contactless reading of registered parameters from sensor device. Note here that said sensor device allows registration of data on forming roll state parameters and may be operated at forming roll temperature making at least 150°C. Besides, proposed system comprises cart for roll change. Note also that said sensor device will be arranged on replacement forming roll.

EFFECT: higher reliability.

14 cl, 5 dwg

FIELD: process engineering.

SUBSTANCE: proposed seal comprises cover and sealing V-like annular cuffs including case, jaw with working edges to get in contact with baffle and adapter fitted on bearing bush. Working edges are pressed against sealed surface by elastic properties of the jaws. Gaps resulting from wear of cuff working edges are ruled out by providing the proposed device with elastic ring elements with cross-section shaped to circle or ring fitted with interference between cuff case and jaw.

EFFECT: higher efficiency.

1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy. Rolling mill for rolling strip 4 has several main stands 1, 1' and reeler 2 arranged there behind. Said main stands incorporates working rolls 5, 5' and, at least, bearing rolls 6, 6'. Rolling mill control device 3 receives data on strip 4 to define, at least, one reduction A other than zero of strip 4 of all passes at rolling mill. Control device 3 uses entered data to define reduction of single pass for main stands 1, L. Said control device controls over stands 1, 1' and reeler 2 to make strip 4 be rolled in main stands in compliance with definite single-pass reductions and, then reeled, by reeler 2. Single-pass reduction of the main stand 1' arranged immediately ahead of reeler 2 equals zero while outlet side tension in strip 4 is smaller than that and inlet side. Strip 4 passes through said stand L with no deformation on, at least, one side.

EFFECT: higher quality of strip.

10 cl, 5 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy. Rolling mill for rolling strip 4 has several main stands 1, 1' and reeler 2 arranged there behind. Said main stands incorporates working rolls 5, 5' and, at least, bearing rolls 6, 6'. Rolling mill control device 3 receives data on strip 4 to define, at least, one reduction A other than zero of strip 4 of all passes at rolling mill. Control device 3 uses entered data to define reduction of single pass for main stands 1, L. Said control device controls over stands 1, 1' and reeler 2 to make strip 4 be rolled in main stands in compliance with definite single-pass reductions and, then reeled, by reeler 2. Single-pass reduction of the main stand 1' arranged immediately ahead of reeler 2 equals zero while outlet side tension in strip 4 is smaller than that and inlet side. Strip 4 passes through said stand L with no deformation on, at least, one side.

EFFECT: higher quality of strip.

10 cl, 5 dwg

FIELD: metallurgy.

SUBSTANCE: method for obtaining high-strength wire from (α+β)-titanium-based martensite alloy involves obtaining of ingot, its hot deformation so that workpiece for drawing is obtained; drawing at room temperature till final size is obtained, and final heat treatment. After heat treatment is completed, the obtained workpieces are annealed in the air and machined; drawing is performed for many times with intermediate annealings in the air environment; at that, the machining is performed after the first drawing pass, and final heat treatment is performed in the air environment during 60-180 minutes at temperature of (0.5÷0.7)TSL °C with further cooling to room temperature.

EFFECT: increasing ultimate tensile strength at maintaining the high level of relative elongation due to uniformity of the structure throughout the length and section of wire.

1 tbl, 2 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to rolling plant, and namely to tandem rolling plant for cold-rolled strip, with several roll stands located in one rolling mill; besides, in production direction (P) of metal strip the first roll stand is made as the drive roll stand and serves as an inlet for continuous roll stand section in which considerable reduction of metal strip thickness is performed, and due to the appropriate control of drive roll stand there can be achieved the increase in mechanical stress at metal strip inlet. There also described is control method of rolling plant, and namely tandem rolling plant for production of metal strip, in which the first roll stand is controlled in production direction (P) of metal strip as drive roll stand, in which by means of drive roll stand there performed is considerable increased in mechanical stress at metal strip inlet without considerable reduction of metal strip thickness.

EFFECT: providing the distribution of single reductions in compliance with design features of an individual roll stand in rolling mill.

17 cl, 2 dwg

FIELD: plastic working of metals, possibly manufacture of thin high-strength foil of titanium.

SUBSTANCE: method comprises steps of multi-pass reversing cold rolling and vacuum annealing; repeating cycle; using as initial blank titanium blank with ultra-fine grain structure provided due to intensified plastic deformation by equal-duct angular pressing process; rolling at pitch 15 - 8% for achieving total deformation 70 - 86 % per one cycle; setting number N of cycles necessary for making foil with thickness h according to mathematical expression; realizing vacuum annealing, preferably at temperature 350 -360 C for 0.5 - 1 h. Invention provides possibilities for making titanium foil with thickness up to 10 micrometers.

EFFECT: enhanced strength characteristics of titanium foil of lowered thickness with the same technological platicity7777.

2 cl, 2 tbl

Up!