Rolling mill temperature control

FIELD: process engineering.

SUBSTANCE: invention relates to rolling and serves for adjustment of planarity at rolling of aluminium strip or foil. In compliance with this invention, this device comprises pair of working rolls to receive the strip or foil in contact zone between rolls. Besides, it comprises multiple fluid feeders configured to direct said fluid to one or more zones on the surface of at least one roll and heater to heat said one or more zones. Proposed method comprises feeding the cryogenic fluid to one or more zones on roll or rolls surface/surfaces via one or strip or foil feeders. Note here that said zones are distributed uniformly over roll width. One zone or more zones are heated on roll surface by one or more heaters for adjustment of roll radial size over its width.

EFFECT: higher quality of strip or foil.

29 cl, 3 dwg

 

The invention relates to the field of rolling mills for aluminum strip or foil and describes a new process that will improve the regulation of the temperature of the rolls, in order to improve the flatness of the strip and to provide other advantages security and performance.

The process of rolling of aluminium requires lubrication in order to obtain a satisfactory surface finish of the strip at higher elongation ratio. However, even with lubrication technology rolling process produces a large amount of heat which must be dissipated to prevent overheating and destruction of the lubricant. Therefore requires additional cooling rolls. To date this has been achieved in only two ways:

A small number of rolling mills, rolled aluminium strip or foil, use a water-based emulsion as a rolling cooler and lubrication. It would seem the ideal solution, because water has a high cooling capacity, while the oil content can be configured to give good lubrication properties. However, if the water is not completely removed from the strip immediately after rolling, the strip surface are formed mordant agent, marring its appearance. In practice, it was obvious the ü it is difficult to provide a completely dry strip, if the output temperature of the strip from the rolling mill is not significantly higher than 100°C. This limits the practicality rolling, and hence, only a small number of professional rolling mills, rolled special products, use this method.

The vast majority of rolling mills, cold rolled aluminium strip or foil, use kerosene as a rolling lubricant and coolant. It was found that the kerosene must have the best compromise between the properties of the cooling and lubrication without any problems leaving traces on the strip. However, kerosene is not the best lubricant or coolant and has significant problems of fire safety related to environmental and health problems, associative associated with it.

In order to improve the efficient cooling kerosene, may require the expenditure of up to several thousand liters per minute. Such volumes require expensive recirculation systems and filtration and will inevitably be forced to form an oil mist, which requires a costly diversion systems and gas cleaning. The inventors showed that for the purposes of lubrication can be sufficient costs less than 10 liters per minute.

In both the above solutions combs races is liteline nozzles apply the fluid directly on the rolls, in order to effectively cool them, while additional separately controlled spray nozzles direct fluid on the rolls below the zone of contact of the rolls, in order to lubricate the process of rolling.

An additional use for cooling aerosols are also known. One of the main challenges in cold rolling aluminum strip and foil is to ensure that the product is flat after rolling. Poor flatness is called stripe, sanjeevi thickness for different values of the width of the rolling mill. This is caused by changes of the gap between the rolls in the rolling mill. Changing the cooling effect of the width of the roll can report different degrees of thermal expansion of different parts of the roll, thereby providing a mechanism to compensate for local changes in the roll gap.

There are a number of patents (for example, GB2012198, EP41863), illustrating the technology to change the cooling rate across the width of the roll using a device for measuring the flatness on the outlet side of the rolling mill, direct flatness of rolled strip.

GB2156255 describes the technological process, which uses separate lubrication and cooling (SLC). Combs water jets used for ohlord is of the rolls and implementation regulation of the form, while the low number of more suitable lubricating oil applied to the strip upstream from the rolling mill.

The effect, known in the aluminum industry as "solid edge"is one of the main reasons that the tear strip during rolling. GB2080719 describes a partial heating of the rolls with the use of so-called "Inductors dense edges" (TEI). This technology uses inductive effect for local heating of rolls in the area of the strip edges, to prevent incomplete rolling of the strip edge.

This technology has been used successfully on a number of rolling mills, however, there are significant problems with the use of electronic devices on the rolling mill, using kerosene cooler.

In his paper "Thermal regulation forms during cold rolling of the strip by means of an adjustable inductive heating rolls", international conference on rolling steel, Japan, 1980, Sportman and Pavelski describe the experiments made using a combination of water cooling injectors and induction heaters for change thickness during rolling of steel strip.

Additional improvements in this technology up to date has been limited to improvements in the regulirovanie and permission cooling effect of the kerosene.

Meanwhile, in other areas, was completed some work on the use of cryogenic gases or liquids as refrigerant in industrial rolling processes. Various patents have been published on this topic, including DE3150996, JP2001096301, WO02/087803, US6874344.

But all of this previous work has focused on cooling the processed material for metallurgical and other effects.

US 2007/0175255 discloses a method and apparatus for cold rolling metal rolling, in which a number of nozzles used to apply different combinations of lubricating emulsion or crude oil, coolant and inert gas are in klinovuyu and arch areas of the upper and lower rolls for cleaning, cooling, lubrication and ensure inertness. Regulation flatness thermal barrel mill roll is mentioned, but it is described as achieved by using a combination of inert gas and traditional coolers, which in the field of machinery rolling of aluminum implies a high consumption of kerosene with all its associative related issues and safety equipment.

According to the invention the device controlling the temperature of the roll and of the time rolling a metal strip or foil contains the characteristics set out in paragraph 1 of the formula is subramania, attached to the materials of the present application.

According to the second aspect of the invention a method for regulating the temperature of the roll and of the time rolling a metal strip or foil contains the characteristics set out in paragraph 18 of the claims attached to the materials of the present application.

In the context of this application of the invention, the term cryogenic substance is specified with reference to a substance which is normally gaseous at room temperature, but which remains in the liquid state via a suitable regulation of the temperature and pressure and which is used as coolant. Related terms, such as cryogenic shall be construed accordingly.

Cryogenic substance includes, but not as a limitation, nitrogen, carbon dioxide, argon and oxygen.

Embodiments of the invention provide a new, improved technology regulation cooling and flatness, which is designed with the following characteristics:

Combing device applying a cryogenic gas or liquid used cooling to either or both sides of the rolls.

These devices application is divided into separately controlled zone, which can be adjusted to give the effect of changing cooling across the width of the roll.

Additionally, one and the and more heating devices full width of the roll used in connection with devices of drawing cooler roll.

A heating device of the roll is divided into a number of separately controllable zones across the width of the roll. The number of zones may or may not be the same as the number of cooling zones depending on the requirements of the process.

System flatness control in connection with a device for measuring the flatness installed on the discharge side of the rolling mill, changes the amount of cooling or heating to be applied to each zone of the width of the roll, in order to produce a flat strip. In its simplest form, the system flatness control performed by the human operator, which changes the amount of heating and/or cooling in response to data generated by the device for measuring the flatness. In a more sophisticated embodiment, the electronic controller is provided and is made with the ability to change the heating and/or cooling in response to such data.

Isolated and secure supply of cryogenic substances attach storage containers to the heads of the application.

In order to prevent the condensation of water vapor due to the cold temperatures, the stand of the rolling mill can be equipped with dual-stage sealing system and ventilation. Inner compartment containing the cage mill is kept under positive what t, to ensure no penetration of water vapor in the cooled region, while the outer region is kept at a negative pressure compared with the main part of the shop, in order to prevent the depletion of oxygen in the areas of personnel access.

Separate rolling lubricant is applied to the strip before rolling. It is applied very thin, even layer using a process such as an electrostatic precipitator.

This system offers numerous great advantages over the prior art:

Complete replacement of kerosene as the cooler rolls cryogenic cooled inert liquid or gas eliminates the risk of fire, the rolling mill. Simultaneous elimination of the risk of loss of integrity and products, along with eliminating the need to install expensive equipment fire.

Reduced impact on the environment of the rolling process of aluminum. Hydrocarbon emissions into the atmosphere is reduced to zero as soon as the kerosene is removed from the process.

The introduction is divided into zones full width of the cooling and heating of the roll gives the system the flatness able to react quicker to changes in the technological process, than the system is only with cooling. It also gives you the ability to easily control the temperature of the rolls in situations such as changing the width or cold starts, where all or part of the rolls should be heated, and other parts must be cooled.

The outer zone of the heating devices will also provide an effective reduction of the defect flatness "thick edge".

The application of very small amounts of alternative rolling oils directly on the strip before rolling will result in the following advantages over existing systems:

Optimization of the properties of oil to lubricate the rolling, providing a greater number of cuts can be for a given set of parameters of the rolling mill compared with kerosene rolling - this leads to better performance

Reduced frequency of events etched in rolls during annealing caused by excessive grease left on the strip after rolling, it leads to a higher yield of products

Reduced frequency of events etched in rolls, caused by contamination of coolant leaks oil, it leads to a higher yield of products

Short time for annealing coils, due to the reduced requirement to evaporate the excess kerosene

Additionally, replacement ke the aspen cryogenic cooler eliminates the need for the following components and their associated operating costs:

Storage containers of kerosene and circulation system

Purification system for vapor kerosene

Installation for filtering kerosene

Equipment polishing strip at the exit of the rolling mill

Troubleshooting installation filter kerosene removes equipment to use and the subsequent costly disposal of hazardous environments, filtering, resulting in winning security and cost.

Construction of the rolling mill are greatly simplified, since eliminated the need for specially protected oil chutes and storage pits.

Requirements for placement of rolling mill generally decrease with the elimination of large processing systems kerosene.

The invention hereinafter will be described a non-limiting example with reference to Fig. 1, 2 and 3, on which:

Fig. 1 shows a perspective representation of a rolling mill according to the invention;

Fig. 2 is a detailed view showing an additional preferred characteristic of the invention, and

Fig. 3 is a schematic illustration of the invention illustrating an additional preferred characteristic of the invention.

Fig. 1 shows a schematic diagram of the cage 1 rolling mill according to the invention with aluminum strip or foil 2 through the cage from left to right, as indicated by the arrow. Work rolls 3 and support the preliminary rolls 4 rolling mill loaded and rotate, in order to perform the reduction of thickness of metal, as is well known in the art. Before entering the area shown in the diagram, the metal, which must skate 2 has a suitable rolling lubricant, put a very thin uniform layer. By the present invention typically sufficient lubricant consumption less than 10 liters per minute.

The local temperature (and therefore, the diameter of the work rolls 3 regulated during the process of rolling process, as set forth below:

System 5 cryogenic storage and delivery delivers cryogenic cooler device 7 application of refrigerant through insulated and protected inlet pipe 6. In this embodiment, device 7 application of the cryogenic cooler is located on the discharge side of the rolling mill, but they could be located anywhere along the diameter of the work roll 3, as dictated by the size of the rolling mill, the available space and the required cooling effect.

Device 7 application of cryogenic refrigerant is divided into separately controlled zone, to apply different cooling effects on the width of the rolls, as required by the system flatness.

In addition to the devices 7 drawing refrigerant heating device 8 full Shi the ins shown on the entrance side of the rolling mill. These heating device 8 can be located anywhere around the periphery of the work roll, as dictated by the size of the rolling mill, the available space and the required cooling effect.

The heating device 8 is divided into separately controlled zone, to apply varying the heating steps across the width of the rolls, as required by the system flatness.

The device 9 for measuring the flatness, known as "meter" in the art, is used to give feedback signals related to the flatness of the strip, manufactured rolling mill. These signals are used by the system flatness control. Any signal showing the flatness of the strip may serve as a feedback, where the control system establishes the configuration of the heating device and/or devices application of cryogenic substances. For example, since the flatness of the strip is a function of the roll profile, the use of meter forms to measure the latter gives a signal indicating the flatness of the strip, albeit indirectly (the term "roll profile" is meant to indicate the uniformity of the diameter of the roll on its width). However, in the illustrated preferred embodiment, the implementation of the population meter 9 form is used for measuring the flatness of the strip.

Electronic computerized system flatness control (not illustrated) is used to ensure that the treated metal is as flat as possible. Electronic control system uses feedback signals from the measuring instrument forms plus other rolling parameters as input into a computer model of flatness. The model then calculates the correct action that should be taken to ensure that the flat strip. These actions are sent as electronic signals on a device applying a cryogenic cooler, a heating device full width and traditional mechanical drives flatness provided as part of the stands of the rolling mill (for example, cylinders adjust the gap between the rollers).

System flatness control for use in connection with based on kerosene cooling known in the art, in light of these information specialists is fully capable to provide a system suitable for use with a cryogenic cooler.

A unique system coupled cooling and heating full width allows greater flexibility in the regulation and faster reaction times temperature change.

With reference to figure 2, the inventors have found that with a the Yu flatness control drawing cooler 'klinovuyu' zone 10 of the roll is undesirable for at least two reasons, namely:

1) it gives rise to an ill-defined and irregular zones of the spray, which makes the regulation of flatness more difficult, and

2) some cooler inevitably in contact with the strip, and uncontrolled cooling of the strip on either side of the roll can cause errors of flatness.

For these reasons, according to a preferred variant of the invention, the cryogenic cooler is directed to 'arch' or sloping area roll 11 and the screen 12 is included in the composition to prevent the achievement of the cooler V-zones.

The screen 12 is schematically illustrated in figure 3. In practice, the screen 12 (for example) could be implemented as a gas curtain, solid screen or a combination of both.

In order to realize the effectiveness of the above system, it is preferable to use cryogenic equipment did not cause the water to condense on the equipment of the rolling mill and drip on the strip. Figure 3 shows the preferred method of excluding water vapor from the stands of the rolling mill, and hence prevent any condensation.

Equipment 13 stand rolling mill surrounded by the inner chamber 14. The camera is created of sheet material 15 and will include close access points, and removable sections, as trebuetsya to allow access for maintenance and repair to equipment 13 stand rolling mill. The metal, which should be treated 16 rolling mill, will pass through the openings on each side of the internal chamber 14. Inner chamber 14 is not a sealed unit, but the sheet material 15 reduces the remaining openings 17 to a certain size, where the pressure within the chamber can be adjusted.

Before rolling (for example, after action maintenance and repair) a suitable amount of dry gas is introduced into the internal chamber in order to displace any water vapor that may be present, before activated device 19 application of the cryogenic cooler. Dry gas is introduced at one or more points 18 within the internal chamber 14.

One or more points in 20 of the gas provided to the inner chamber. These sampling points are attached to a single system of gas sampling, as is well known in the art. The valve or damper 21 is present at each point 20 selection for controlling the amount of selection that occurs.

During the rolling of the cryogenic cooler is used for cooling the rolls, creates pressure dry gas within the internal chamber 14. Point 18 of the supply of dry gas or flap 21, as is supposed, are used to ensure that a small positive pressure of dry gas is stored in p is adelah the internal chamber 14. This adjustment can be done manually or automatically using a suitable pressure sensor. A small positive pressure will prevent any penetration of water vapor, but will also cause some amount of dry gas constantly go from the inner chamber through the gaps presented by 17.

To prevent the accumulation of gas that reduces the oxygen levels in the areas of access of the operator around the cage of the rolling mill, the outer chamber 22 surrounds the inner chamber. Outdoor camera has the same design sheet material as the inner chamber. Like the inner chamber outer chamber is not completely sealed, but the openings are reduced in size enough to allow some regulation of the pressure.

Provided by point 23 selection attached to the same selection process gas, and the internal camera. Valves or valve 24 regulates the speed of selection, to ensure that the outer chamber is always kept at a negative pressure relative to the zones of the operator, and hence, the surrounding air will be sucked into the openings 25 in the outer chamber 22. Through this method, the minimum gas discharged from the outer chamber, ensuring the safety of operators rolling mill.

Properly the rd system selection is checked properly spaced sensors 26 depletion of oxygen.

1. Rolling device for rolling a metal strip or a metal foil containing a pair of work rolls made with the possibility of receiving strip or foil in the area of contact of the rolls between them, many feeders fluid made with the possibility of the direction of the fluid in one or more of the many areas on the surface of at least one of the rolls, and means for heating one or more of the many areas on the surface of the roll through one or more heating devices, and the feeder fluid made with the possibility of supply of cryogenic fluid, and the fluid contains a cryogenic fluid.

2. The device according to claim 1, characterized in that it is provided with a device for measuring the flatness made with the possibility of the signal, showing the flatness of a metal strip or metal foil after vanishing from the roll.

3. The device according to claim 2, characterized in that it is provided with a means for changing the heat and/or cryogenic fluid to one or more areas in response to the said signal.

4. The device according to claim 3, characterized in that it has a processor, configured to receive signals from the device for measuring the flatness and control of the heating devices and/or devices supply of cryogenic fluid in response to the aforementioned signals is to change the heat and/or cryogenic fluid to one or more zones.

5. The device according to claim 1, characterized in that the device for measuring the flatness made with the possibility of measuring the profile of the roll or the direct measurement of the flatness of a metal strip or a metal foil.

6. The device according to claim 1, characterized in that it is provided with a supply of lubricant, and means for directing lubricant to the metal strip or a metal foil upstream from the rolls.

7. The device according to claim 6, characterized in that the supply of lubricant is arranged to feed lubricant in the amount of less than 10 liters per minute.

8. The device according to claim 1, characterized in that the feeder cryogenic fluid is made with the possibility of sending a cryogenic fluid to one or more of the many areas of the arch region of at least one of the rolls.

9. The device according to claim 8, characterized in that it is provided with at least one screen configured to prevent penetration of the cryogenic fluid in klinovuyu region of the roll and/or strips and/or foil.

10. The device according to claim 9, characterized in that the screen quality used solid screen TV and a gas curtain.

11. The device according to claim 1, characterized in that it has an internal compartment, the covering rolls, outer cover covering the inner compartment, means for under what the actual content of the internal compartments under positive pressure relative to ambient pressure, and means for maintaining the outer compartment under negative pressure relative to ambient pressure.

12. The device according to claim 11, characterized in that it is provided with means for injection of dry gas.

13. The device according to claim 11, characterized in that it is provided with a means of selection of gas.

14. The device according to claim 1, characterized in that as the cryogenic fluid used nitrogen or carbon dioxide.

15. Method for controlling shape during rolling of a metal strip or a metal foil, including the direction of the cryogenic fluid to one or more of the many areas on the surface of one or more rolls through one or more devices supply of cryogenic fluid, with many zones are evenly distributed across the width of the roll, and heated one or more of the many areas on the surface of the roll through one or more heating devices for regulating the radial dimension of the swath width of the roll.

16. The method according to item 15, characterized in that it additionally includes the stage of using the device for measuring the flatness generate a signal indicating the flatness of the metal strip after it comes off the roll, take the signal from the device for measuring the flatness and change the flow of cryogenic fluid and/or heat to one or more areas in response to the said signal.

17. The method according to item 16, characterized in that the supply of cryogenic fluid and/or heat to one or more zones change Aut manually using the operator in response to the said signal.

18. The method according to item 16, characterized in that the supply of cryogenic fluid and/or heat to one or more zones change using the processor, configured to receive signals from the device for measuring the flatness and control one or more devices supply of cryogenic fluid and/or one or more heating devices.

19. The method according to item 16, characterized in that the device for measuring the flatness perform with the possibility of measuring the profile of the roll or the direct measurement of the flatness of a metal strip or a metal foil.

20. The method according to item 15, characterized in that in addition put grease on the metal strip or a metal foil upstream from the roll.

21. The method according to claim 20, characterized in that the lubricant is applied with a flow rate of less than 10 liters per minute.

22. The method according to item 15, wherein the cryogenic fluid is directed into the curved region of the at least one roller and additionally carry out the stage at which set the screen to prevent the ingress of cryogenic fluid in klinovuyu region of the roll and/or strips and/or foil.

23. The method according to item 22, characterized in that the screen quality using solid screen or a gas curtain.

24. The method according to item 15, characterized in that it further comprises the steps on kotoryhtakie rolls in the inner compartment, enter into the inner compartment to the outer compartment to maintain positive pressure in the inner compartment relative to the ambient pressure and maintain a negative pressure in the outer compartment relative to the ambient pressure.

25. The method according to paragraph 24, wherein the pressure in the inner compartment regulate using the injection of dry gas and/or gas extraction.

26. The method according A.25, characterized in that the pressure of the outer compartment regulate using the gas selection.

27. The method according A.25, characterized in that the regulation mentioned pressure compartments is carried out manually by a system with open-circuited.

28. The method according A.25, characterized in that the regulation mentioned pressure compartments carried out automatically using the reading pressure in connection with computer control system.

29. The method according to item 15, wherein one or more of the many areas on the surface of one or more rolls served cryogenic fluid containing nitrogen or carbon dioxide.



 

Same patents:

FIELD: process engineering.

SUBSTANCE: method comprises spraying lubricant (9) on entry side (7a) of stand (1) and coolant (10) on stand (1) exit side (8a) and feeding them to strip bottom (2a) and/or top (2b), and/or stand (1) bottom roll (4) and top roll (3). Amount of lubricant on said entry side is continuously calculated and proportioned using physical model (22) to correspond to minimum required amount for rolling with due allowance for such rolling parameters as speed (13), strip quality (14), for example, tensile strength, flatness (11a, 11b), surface roughness (26) and tension (28) at stand entry and exit, rolling force (29), roll diameter (30), roughness and (31) and material (32) of rolls.

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FIELD: plastic working of special magnesium base alloys alloyed with elements capable to easy evaporation or to generation at deformation oxides hazard for environment, possibly manufacture of rolled sheets used for making anodes of electrochemical current sources.

SUBSTANCE: method comprises steps of preliminarily deforming heated blank of magnesium base alloy and warm rolling of preliminarily deformed blank for producing sheet; before preliminary deformation placing magnesium alloy blank into envelope of aluminum (Al-Mg-Si system) alloy without sealing. Length of envelope exceeds length of blank at least by 10%. Preliminary deformation is realized by hot rolling or upsetting in die set according to configuration of blank.

EFFECT: production of sheets with electrochemical properties uniform along the whole cross section and with enhanced surface quality, safety labor condition due to preventing evaporation of mercury, toxic oxides and other compounds containing mercury, thallium, gallium, cadmium.

12 cl, 4 tbl, 4 ex

FIELD: metallurgy; plastic metal working; production of strips from aluminum alloys.

SUBSTANCE: proposed method includes multi-pass hot rolling and final rolling; last pass of multi-pass hot rolling is performed at rate of deformation of 60-150 1/s and degree of deformation of 35-60% at temperature of Trec.+30 to Trec.; after multi-pass hot rolling, metal is subjected to relaxation holding at temperature range of Trec.+30 to Trec. continued for 2-50 min; said rate of deformation, degree of deformation and temperature of last pass of hot rolling, as well as temperature and time of last relaxation holding ensure completeness of spontaneous recrystallization; final rolling is performed at degree of deformation of 30-75% at temperature range of from Trec.-100 to Trec.-150, where Trec. is recrystallization temperature; then, roll is cooled in air. Ingots of mass no less than 5 t may be subjected to multi-pass hot rolling.

EFFECT: improved quality of metal possessing low anisotropy and enhanced mechanical properties.

2 cl, 1 ex

FIELD: non-ferrous metallurgy; methods of titanium alloy bricks production.

SUBSTANCE: the invention is pertaining to the field of non-ferrous metallurgy, in particular, to the brick made out of α+β titanium alloy and to a method of its manufacture. The offered brick consists of the following components (in mass %): aluminum - 4-5, vanadium - 2.5-3.5, iron - 1.5-2.5, molybdenum - 1.5-2.5, titanium - the rest. At that the alloy out of which the brick is manufactured, contains - 10-90 volumetric % of the primary α-phase. The average grain size of the primary α-phase makes 10 microns or less in a cross-section plain parallel to the brick rolling direction. Elongation of grain of the primary α -phase is the four-fold or less. The offered method of manufacture of the given brick includes a stage of a hot rolling. At that before the stage of the hot rolling conduct a stage of the alloy heating at the surfaces temperature (Tβ-150)- Tβ°C. During realization of the stage of the hot rolling the surface temperature is kept within the range of (Tβ-300)-( Tβ -50)°C, and the final surface temperature, that is a surface temperature directly after the last rolling, makes (Tβ-300)-( Tβ-100)°C, where Tβ is a temperature of α/β-transition. The technical result of the invention is formation of a brick out of the high-strength titanium alloy having a super pliability, excellent fatigue characteristics and moldability.

EFFECT: the invention ensures production of a brick out of the high-strength titanium alloy having a super pliability, excellent fatigue characteristics and moldability.

7 cl, 7 dwg, 21 tbl, 2 ex

FIELD: rolling processes and equipment, namely manufacture of armor sheets and plates of aluminum base alloys used in aircraft- and ship manufacture, for making armored transport vehicles and so on.

SUBSTANCE: method for making armor sheets and plates of aluminum base Al-Mg-Mn alloys with Mg content no less than 4 mass % comprises steps of hot rolling of ingot to plate and finish rolling of it; performing as finish rolling warm rolling at temperature 80 - 300°C with total deformation degree no less than 60%; preferably realizing warm rolling at temperature 250 - 290°C with total deformation degree 65 - 80%. Invention provides ballistic protection degree 738 - 742 m/s for plates with thickness 38.0 -38.2 mm at firing on with armor-piercing shells 7.62.

EFFECT: improved resistance against ballistic action due to constant strength and ductility values at high corrosion resistance, good welding capability and small mass.

4 cl, 3 dwg, 2 tbl, 2 ex

FIELD: plastic metal working.

SUBSTANCE: invention is designed for manufacturing of flat sections from zirconium-niobium alloys for use as structural materials of active zone in nuclear reactors. Proposed method includes forging of ingot of zirconium-niobium alloys, hot rolling with heating in α+β-area, cold rolling with intermediate and vacuum thermal treatments. Hot rolling is carried out at one stage of heating with integral value of deformation 1nμ.2.5 and partial reductions per pass of 1nμ≤0.32 or at two heating stages at summary deformation of 1nμ≤2.8. In some cases, prior to one of hot rolling stages, hardening of semifinished products is carried out from area of existence of β-zirconium. Invention guarantees mechanical properties of structural members for active of nuclear reactors at height technical and economical characteristics of production of flat sections from zirconium-niobium alloys featuring form-changing capabilities.

EFFECT: improved economy and homogeneity of mechanical properties of rolled product.

2 cl, 2 ex, 1 tbl

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