CN113430359B - High-strength and high-toughness rolling method for large-size gun steel bar - Google Patents
High-strength and high-toughness rolling method for large-size gun steel bar Download PDFInfo
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- CN113430359B CN113430359B CN202110544919.7A CN202110544919A CN113430359B CN 113430359 B CN113430359 B CN 113430359B CN 202110544919 A CN202110544919 A CN 202110544919A CN 113430359 B CN113430359 B CN 113430359B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/20—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a non-continuous process,(e.g. skew rolling, i.e. planetary cross rolling)
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- C—CHEMISTRY; METALLURGY
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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Abstract
The invention discloses a high-strength and high-toughness rolling method of gun steel, relates to the field of gun steel material processing methods, and particularly relates to a high-strength and high-toughness rolling method of gun steel, which comprises the following steps: designing a tool, determining deformation parameters, processing, preparing and installing a deformation tool, adjusting the deformation parameters, then placing a blank in a heating furnace, heating to 1050-1070 ℃, preserving heat for 2 hours, then quickly cooling to 800-830 ℃ at 5-7 ℃/s, and preserving heat for 5 min; 3D-SPD forming, namely cooling the rolled blank by water; and (3) heating the water-cooled blank to 630-650 ℃, preserving the heat for 2h, and cooling the blank to room temperature in air. The invention adopts a process system of solid solution before deformation and direct water cooling and tempering treatment after deformation, can effectively avoid the growth of fine grains obtained by large deformation in the subsequent solid solution treatment process, and simultaneously utilizes solid solution strengthening, fine grain strengthening and second phase strengthening to obviously improve the obdurability of the shot steel. The adoption of the pressure-torsion composite 3D-SPD process avoids the prior need of adding expensive alloy elements to achieve the expected performance of the material.
Description
Technical Field
The invention relates to the field of processing methods of gun steel materials, in particular to a high-strength and high-toughness rolling method of a large-size gun steel bar.
Background
The gun steel is an important material in weapon materials, and the common standard for evaluating the performance of the gun is the energy of a muzzle, the shooting precision and the service life, but with the continuous improvement of the performance of the gun in the present year, the three indexes can not meet the requirements on the design and the use of the gun, and particularly, the gun steel for a small-caliber quick-firing weapon is more obvious, and the gun steel for the small-caliber quick-firing weapon requires the material strength limit, particularly the proportion or the yield limit to be high, and simultaneously has the advantages of high heat strength, high temperature wear resistance and ablation resistance. The continuous development of modern tank cannons, grenade cannons and other large-caliber cannons provides higher challenges for the research and preparation of industrial large-size cannon steel materials. In view of this, how to realize the improvement of the performance of the large-size gun steel material is a problem which needs to be solved urgently at present.
The report of the process for preparing the high-strength and high-toughness steel shot is fresh at home and abroad, but the steel shot has the advantages of high strength, high toughness and the like, so that the wide application prospect in the processing field is doubtful.
Document 1 (publication No. CN 111455283A) discloses an extrusion molding process of a gun steel material, in which alloying elements such as C, Co, Mo, etc. are added into a refining agent, and the chemical component proportion and the rolling temperature of the raw materials of the gun steel are changed to prepare high-strength and high-toughness gun steel, so that the cost is increased.
In document 2 (publication No. CN 111020321A), it is disclosed that a gun steel product formed by SLM (Selective laser Melting) has low interlayer bonding force due to lack of external pressure stress between the various layers, so that the formed part has low plasticity, and the subsequent heat treatment requires four stages of quenching treatment and tempering treatment, which complicates the heat treatment process and increases energy consumption.
The literature 3 (Hushilu, luyan, Hujun, Lidong kernel, Huangjian text. development of high-strength and high-toughness thick-wall gun steel material [ J ]. weapon material science and engineering, 2018,41(06):108 + 112.) discloses that the theoretical design of the gun steel component system by the "alloy reduction method" and the production of high-strength and high-toughness gun steel by the alloying and oxide control method have complicated process.
Document 4 (Han Zhang, Qiansheng, Zhao Jinyun, Ma Sheng Bai. double quenching has an influence on obdurability of blast steel [ J ] weapon material science and engineering, 1987 (10): 27-33.) proposes a heat treatment process of heating and quenching at an ultra-high temperature, then heating and quenching at 10-20 ℃ above AC1, but the ultra-high temperature quenching can improve fracture property of blast steel and simultaneously reduce notch impact toughness.
In recent years, ultra-fine grain/nano-grain materials have received attention from experts in the material field of various countries around the world due to their excellent properties. The level of toughness of polycrystalline materials has been continuously increased by continuously refining grains, and among them, the research results of the Severe Plastic Deformation (SPD) technology have been particularly noted. Currently, the mainstream SPD process includes five methods of High Pressure Torsion (HPT), equal channel angular Extrusion (ECAP), cumulative pack rolling (ARB), Multidirectional Forging (MF), and Torsional Extrusion (TE). However, these SPD methods also have significant limitations, mainly manifested by:
(1) the severe deformation zone has poor permeability which is only generated near the surface layer of the workpiece-die or workpiece-workpiece and does not penetrate into the core part of the workpiece, i.e. the deformation zone has small penetration depth or poor penetration capability, thus being far incapable of meeting the requirements of preparing industrial large-size full-body ultrafine grained materials.
(2) In the deformation process of the existing SPD technology, enough hydrostatic pressure plays an important role in inhibiting deformation defects such as cracks and the like and restraining the free deformation of materials to strengthen the deformation accumulation effect, so that the forming load (the average unit pressure reaches GPa level) of the existing various SPD methods is far higher than that of the conventional plastic deformation method (generally MPa level), and the engineering application of the SPD technology in the field of large-size block material preparation is severely restricted.
Equidistant spiral and reverse tapered spiral roller superfine crystal rolling methods of large-size 45 steel superfine crystal bar materials are mentioned in patents (CN 108580548A) and (CN 108480397A) by Liudong research teams of northwest industry university and west' an building science and technology university, and 45 steel large-size superfine crystal bar materials with the particle size of 1-5 mu m are prepared. In the patent CN 109772890A, a rolling method of a large-size high-temperature alloy ultrafine-grained bar material is provided, and the high-temperature alloy large-size ultrafine-grained bar material with the grain size of about 4.2 mu m and the grain refinement degree of 96.3 percent is prepared
In the forming process, the deformation body generates severe torsion and compression composite plastic deformation in a three-dimensional space, the method is named as a three-dimensional severe plastic deformation method, and is named as a three-dimensional super large plastic deformation method, namely a 3D-SPD forming method, English: 3 Dimensional Server Plastic Deformations, 3D-SPD for short.
At present, the refining of the grain size by the severe plastic deformation process to improve the strength and ductility and toughness of the metal material at the same time is gaining more and more attention. However, the ultra-fine grain material has poor high-temperature thermal stability, and crystal grains are easy to grow up in the heating process. Particularly for the shot steel with combined action of second-phase strengthening and fine-grain strengthening, the second-phase strengthening needs to adopt a heat treatment process of high-temperature solid solution and low-temperature tempering, and the high-temperature solid solution treatment in the heat treatment system can cause the grain size to grow again, thereby offsetting the effect of fine-grain strengthening. Therefore, it has become a difficult problem how to improve the strength and ductility of the gun steel by using the fine-grained strengthening and the second-phase strengthening simultaneously.
The comprehensive analysis shows that: the process for improving the obdurability of the shot steel mentioned in the prior patent or paper is limited by alloy elements and processing temperature, and the industrial-grade large-size high-obdurability shot steel is difficult to prepare.
Disclosure of Invention
Aiming at the problem that the prior art does not have the industrial-grade high-strength high-toughness bar material of the large-size gun steel, the invention provides the high-strength high-toughness rolling method of the large-size gun steel bar material, adopts a proper rolling process and a heat treatment process, and simultaneously utilizes fine grain strengthening and second phase strengthening to improve the strength and the plastic toughness of the gun steel.
The invention relates to a high-strength and high-toughness rolling method of a large-size gun steel bar, which comprises the following steps of:
firstly, tool design and deformation parameter determination: firstly, establishing a finite element model of the 3D-SPD of the gun steel bar by using a finite element simulation technology, and setting convergence conditions as follows: the torsion angle of any mass point in the deformation zone is 30-50 degrees, the face shrinkage is 60-75 percent, and the face shrinkage is as follows: determining the shapes of the roller and the guide plate, the taper angle alpha of the roller surface, the feed angle beta, the rolling angle gamma, the pass ovality coefficient and the roller spacing adjusting parameter according to the ratio of the difference between the original area and the rolled area to the original area; if the blank meets the convergence condition under the action of the determined deformation tool, roll surface taper angle alpha, feed angle beta, rolling angle gamma, hole pattern ovality coefficient and roll spacing adjustment parameters, the next step is carried out, and if the convergence condition is not met, the first step is repeated until the convergence condition is met;
and step two, machining, preparing and installing a deformation tool: obtaining parameters input when the convergence conditions are met according to the first step, and designing a roller and a guide plate, wherein the parameters are optimal technological parameters; designing a rolling angle adjusting cushion block, designing a feed angle adjusting tool, and then finishing the preparation, processing, installation and debugging work of a roller, a guide plate, the rolling angle adjusting cushion block and the feed angle adjusting tool;
thirdly, deformation parameter adjustment: after the installation and debugging are finished, adjusting parameters of a roll surface taper angle alpha, a feed angle beta, a rolling angle gamma, a hole pattern ovality coefficient and a roll spacing according to optimal process parameters;
step four, heating the blank: placing a blank with the diameter of 80-200 mm and the length of 300-1000 mm in a heating furnace, heating to 1050-1070 ℃, preserving heat for 2h, then quickly cooling to 800-830 ℃ at the speed of 5-7 ℃/s, and preserving heat for 5 min;
fifthly, 3D-SPD forming: transferring the blank heated to the temperature from the heating furnace into a guide chute of a rolling mill for 8s, feeding the blank through the guide chute, conveying the blank into a deformation zone between rollers, spirally moving the blank in the deformation zone until the deformation is finished, completely separating from the deformation zone, and cooling the rolled blank by water;
sixthly, heating the water-cooled blank to 630-650 ℃, preserving heat for 2h, and cooling in air to room temperature.
Preferably, in the fifth step, the feeding angle beta is 25-27 degrees, the rolling angle gamma is 20-22 degrees, the rotating speed n of the roller is less than 30r/min, the ovality coefficient is less than 1.02, and the cone angle alpha of the roller surface of the deformation zone is more than 4 degrees.
Preferably, the gun steel is 30Cr3MoNiNb gun steel.
The invention adopts a process system of solid solution before deformation and direct water cooling and tempering treatment after deformation, can effectively avoid the growth of fine grains obtained by large deformation in the subsequent solid solution treatment process, and simultaneously utilizes solid solution strengthening, fine grain strengthening and second phase strengthening to obviously improve the obdurability of the shot steel. The adoption of the pressure-torsion composite 3D-SPD process avoids the prior need of adding expensive alloy elements to achieve the expected performance of the material.
The method comprises the steps of heating to 1050-1070 ℃ for heat preservation for 2h before rolling, rapidly cooling to 800-830 ℃ at the speed of 5-7 ℃/s for heat preservation for 5min, rolling the steel bar of the gun steel by using a 3D-SPD forming technology, cooling by water after rolling, heating to 630-650 ℃ for heat preservation for 2h after water cooling, and then cooling by air to room temperature, so that the problem that solution treatment after large deformation and fine grain affects fine grain strengthening effect can be effectively avoided, and the defect that grain growth affects grain refinement can be avoided, so that the plasticity of the material is reduced, and the obdurability of the gun steel is improved.
The invention can improve the strength of the gun steel material, ensure the plasticity, improve the service performance, improve the productivity, reduce the production cost and have high comprehensive performance.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
FIG. 2 is a heat treatment schedule of the present invention.
FIG. 3 is a schematic diagram of a finite element model of a 3D-SPD of the gun steel bar.
Fig. 4 is a top view of fig. 3.
FIG. 5 is a schematic view of a roll deformation zone.
FIG. 6 is a schematic view of the initial structure of the blank according to the first embodiment.
FIG. 7 is a schematic view of the structure of the blank after being tempered at 640 ℃ for 2 hours in the first embodiment.
FIG. 8 is a schematic representation of the flow lines before deformation.
Fig. 9 is a schematic view of a twist angle.
Reference numerals: 1-blank, 2-roller and 3-guide plate.
Detailed Description
The invention relates to a high-strength and high-toughness rolling method of a large-size gun steel bar, which comprises the following steps of:
firstly, tool design and deformation parameter determination: firstly, establishing a finite element model of the 3D-SPD of the gun steel bar by using a finite element simulation technology, and setting convergence conditions as follows: the torsion angle of any mass point in the deformation zone is 30-50 degrees, the face shrinkage is 60-75 percent, and the face shrinkage is as follows: determining the shapes of the roller 2 and the guide plate 3, the taper angle alpha of the roller surface, the feed angle beta, the rolling angle gamma, the pass ovality coefficient and the roller spacing adjusting parameter according to the ratio of the difference between the original area and the rolled area to the original area; if the blank 1 meets the convergence condition under the action of the determined deformation tool and roll surface taper angle alpha, feed angle beta, rolling angle gamma, hole pattern ovality coefficient and roll spacing adjustment parameters, carrying out the next step, and if the convergence condition is not met, repeating the first step until the convergence condition is met;
and step two, machining, preparing and installing a deformation tool: according to the parameters input when the convergence conditions are met, the roller 2 and the guide plate 3 are designed, and the parameters are the optimal process parameters; designing a rolling angle adjusting cushion block, designing a feeding angle adjusting tool, and then finishing the preparation, processing, installation and debugging work of the roller 2, the guide plate 3, the rolling angle adjusting cushion block and the feeding angle adjusting tool;
thirdly, deformation parameter adjustment: after the installation and debugging are finished, adjusting parameters of a roll surface taper angle alpha, a feed angle beta, a rolling angle gamma, a hole pattern ovality coefficient and a roll spacing according to optimal process parameters;
step four, heating the blank 1: placing a blank 1 with the diameter of 80-200 mm and the length of 300-1000 mm in a heating furnace, heating to 1050-1070 ℃, preserving heat for 2h, then quickly cooling to 800-830 ℃ at 5-7 ℃/s, preserving heat for 5min, and cooling to reach an ideal deformation temperature during deformation, so as to inhibit the coarsening effect of crystal grains, wherein if the blank is directly deformed, the activation energy of the crystal grains is too high, and the crystal grains are coarse;
fifthly, 3D-SPD forming: transferring the blank 1 heated to the temperature from the heating furnace into a guide chute of a rolling mill for 8s, feeding the blank 1 through the guide chute, conveying the blank 1 into a deformation area between rollers 2, spirally moving the blank 1 in the deformation area until the deformation is finished, completely separating from the deformation area, and cooling the rolled blank 1 with water;
and sixthly, heating the water-cooled blank 1 to 630-650 ℃, preserving the heat for 2h, and cooling the blank to room temperature in air.
The feeding angle beta is 25 degrees to 27 degrees, the rolling angle gamma is 20 degrees to 22 degrees, the rotating speed n of the roller 2 is less than 30r/min, the ovality coefficient is less than 1.02, and the roller surface taper angle alpha of the deformation area is more than 4 degrees.
The blast steel is 30Cr3MoNiNb blast steel.
The invention has the advantages that the solution treatment is carried out before rolling, and the water cooling and tempering treatment are directly carried out after rolling, so that the influence of the solution treatment after large deformation and fine grain on fine grain strengthening effect can be effectively avoided, and the influence of the growth of crystal grains on the effects of poor refining plasticity and strength reduction of the crystal grains can be avoided. The combination of solid solution strengthening, fine grain strengthening and second phase strengthening can obviously improve the obdurability of the shot steel. The adoption of the pressure-torsion composite 3D-SPD process avoids the prior need of adding expensive alloy elements to achieve the expected performance of the material.
Example one
The following example illustrates a blank 1 in the form of a bar of gun steel having a diameter of 80mm and a length of 400mm, however, the invention is not limited thereto and other sizes of bar may be produced by the method of the invention. The invention relates to a high-strength and high-toughness rolling method of gun steel, wherein a purchased gun steel bar is obtained by a manufacturer through smelting, forging and machining in a vacuum consumable arc furnace, the quality meets the rolling requirement, a cylindrical blank 1 has three sections of a large end, a middle end and a small end, the diameters are respectively 120mm, 110mm and 100mm, no defects such as impurities, air holes and the like are found, and the schematic diagram of the initial structure of the blank 1 is shown in figure 6.
The processing method comprises the following steps:
step one, tool design and deformation parameter determination: firstly, establishing a finite element model of the 3D-SPD of the gun steel bar by using a finite element simulation technology, and setting convergence conditions as follows: the torsion angle of any mass point in the deformation zone is 40 degrees, the surface shrinkage rate is 60 percent, and the shapes of the roller 2 and the guide plate 3, the taper angle alpha of the roller surface, the feed angle beta, the rolling angle gamma, the pass ovality coefficient and the roller spacing adjusting parameters are determined;
if the blank 1 meets the convergence condition under the action of the determined deformation tool and roll surface taper angle alpha, feed angle beta, rolling angle gamma, hole pattern ovality coefficient and roll spacing adjustment parameters, carrying out the next step, and if the convergence condition is not met, repeating the first step until the convergence condition is met;
and step two, machining, preparing and installing a deformation tool: according to the determined optimal process parameters: designing a model of the roller 2 and the guide plate 3, wherein the roller surface taper angle alpha =5 °, the feeding angle beta =26 °, the rolling angle gamma =21 °, the pass ovality coefficient =1.01, and the roll spacing adjustment parameter =50.60 mm; designing an adjusting cushion block, and then finishing the preparation, processing, installation and debugging work of the roller 2, the guide plate 3 and the adjusting cushion block;
thirdly, deformation parameter adjustment: after the installation and debugging are finished, adjusting the feeding angle beta =26 °, the rolling angle gamma =21 °, the pass ovality coefficient =1.01 and the roll spacing adjusting parameter =50.60mm of the rolling mill according to the optimal process parameters;
step four, heating the blank 1: placing a blank 1 with the diameter of 80mm and the length of 400mm in a heating furnace, heating to 1060 ℃, wherein the heating time t =2h, cooling to 830 ℃ at the speed of 6 ℃/s, and keeping the temperature for 5 min;
fifthly, forming the 3D-SPD: 3D-SPD test: transferring the blank 1 heated to the temperature from the heating furnace to a guide chute of a rolling mill for 8s, feeding the blank 1 through the guide chute, conveying the blank 1 to a deformation area between rollers 2, rotating the rollers 2 at a speed of 25r/min, spirally moving the blank 1 in the deformation area until the deformation is finished, completely separating from the deformation area, wherein the surface shrinkage is 60%, tempering the blank 1 subjected to rolling at a low temperature, cooling the blank 1 with water to the room temperature, then heating to 640 ℃, preserving heat for 2h, and then cooling with air to the room temperature, wherein the structure schematic diagram is shown in fig. 7.
The original structure is shown in fig. 6, and the original austenite grains are refined from 110um to within 10um after single-pass deformation. By adopting the method, the high strength and toughness performance can be obtained through tensile mechanical property tests, after the 3D-SPD process, the yield strength of the gun steel bar can reach 1236MPa, the tensile strength is 1467MPa, the elongation is 13.3%, the reduction of area is 67.4%, and the high strength and toughness performance can be obtained, so that the application prospect is very wide.
Claims (2)
1. A high-strength and high-toughness rolling method for a large-size gun steel bar is characterized by comprising the following steps:
firstly, tool design and deformation parameter determination: firstly, establishing a finite element model of the 3D-SPD of the gun steel bar by using a finite element simulation technology, and setting convergence conditions as follows: the torsion angle of any mass point in the deformation zone is 30-50 degrees, the face shrinkage is 60-75 percent, and the face shrinkage is as follows: determining the shapes of the roller and the guide plate, the taper angle alpha of the roller surface, the feed angle beta, the rolling angle gamma, the pass ovality coefficient and the roller spacing adjusting parameter according to the ratio of the difference between the original area and the rolled area to the original area; if the blank meets the convergence condition under the action of the determined deformation tool, roll surface taper angle alpha, feed angle beta, rolling angle gamma, hole pattern ovality coefficient and roll spacing adjustment parameters, the next step is carried out, and if the convergence condition is not met, the first step is repeated until the convergence condition is met;
and step two, machining, preparing and installing a deformation tool: according to the parameters input when the convergence conditions are met, the roller and the guide plate are designed, and the parameters are the optimal process parameters; designing a rolling angle adjusting cushion block, designing a feed angle adjusting tool, and then completing the preparation, processing, installation and debugging work of a roller, a guide plate, the rolling angle adjusting cushion block and the feed angle adjusting tool;
thirdly, deformation parameter adjustment: after the installation and debugging are finished, adjusting parameters of a roll surface taper angle alpha, a feed angle beta, a rolling angle gamma, a pass ovality coefficient and a roll spacing according to optimal process parameters;
step four, heating the blank: placing a blank with the diameter of 80-200 mm and the length of 300-1000 mm in a heating furnace, heating to 1050-1070 ℃, preserving heat for 2h, then quickly cooling to 800-830 ℃ at the speed of 5-7 ℃/s, and preserving heat for 5 min;
fifthly, 3D-SPD forming: transferring the blank heated to the temperature from the heating furnace into a guide chute of a rolling mill for 8s, feeding the blank through the guide chute, conveying the blank into a deformation zone between rollers, spirally moving the blank in the deformation zone until the deformation is finished, completely separating from the deformation zone, and cooling the rolled blank by water;
sixthly, heating the water-cooled blank to 630-650 ℃, preserving heat for 2h, and cooling in air to room temperature;
the blast steel is 30Cr3MoNiNb blast steel.
2. The high strength and toughness rolling method for the large-size gun steel bar according to claim 1, wherein in the fifth step, the feeding angle β is 25-27 °, the rolling angle γ is 20-22 °, the roller rotating speed n is less than 30r/min, the ovality coefficient is less than 1.02, and the roller face cone angle α of the deformation zone is more than 4 °.
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|---|---|---|---|---|
| WO2013018564A1 (en) * | 2011-08-01 | 2013-02-07 | Nippon Steel & Sumitomo Metal Corporation | Controlled rolling method of seamless steel tube excellent in strength and low-temperature toughness |
| CN112163352A (en) * | 2020-08-13 | 2021-01-01 | 西安建筑科技大学 | Medium carbon steel ultrafine crystal bar 3D-SPD rolling damage prediction method and model |
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