CN110420997B - Heating and rolling method of high-chromium alloy steel plate - Google Patents
Heating and rolling method of high-chromium alloy steel plate Download PDFInfo
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- CN110420997B CN110420997B CN201910667189.2A CN201910667189A CN110420997B CN 110420997 B CN110420997 B CN 110420997B CN 201910667189 A CN201910667189 A CN 201910667189A CN 110420997 B CN110420997 B CN 110420997B
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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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B2001/225—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 plates, strips, bands or sheets of indefinite length by hot-rolling
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Abstract
The invention belongs to the technical field of metallurgy, and relates to a heating and rolling method of a high-chromium alloy steel plate, which comprises the working procedures of heating, rolling and stacking slow cooling; the heating procedure is to place the steel ingot in a heating furnace, adopt a weak oxidizing atmosphere, control the oxygen content to be 1-3%, and adopt a four-stage progressive heating mode. The invention adopts a progressive heating method, finishes rolling at high temperature, stacks and slowly cools after rolling, greatly reduces the probability of cracks generated in the rolling process of the steel plate, improves the yield of the steel plate rolling and reduces the production cost. The high-chromium alloy steel has smooth and clean surface without cracks and neat edges, and meets the use requirements.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a heating and rolling method of a high-chromium alloy steel plate.
Background
The high-chromium alloy steel plate is a high-alloy steel plate, has high chromium content, generally has good corrosion resistance and excellent high-temperature performance, and represents 9Cr steel, 5Cr steel and the like for welding steel pipes. In the production process of the steel, steel ingots are directly heated to the required rolling temperature, the temperature rise speed is controlled simply, and in the actual production, in order to save energy, reduce consumption and control cost, the steel ingots are generally heated in the same furnace with other types of steel and adopt the same processing system. Meanwhile, the rolling reduction and the finishing temperature are not controlled generally because of the need of subsequent heat treatment. Because the Cr content in the steel is high, when the steel is produced according to the conventional steel ingot heating and rolling process, surface cracks often appear at the edge or head and tail of a slab in the rolling process, and cracking or even slab fracture can occur in serious cases, so that steel billets are scrapped. The finished steel plate needs to be cut off at the cracked portions, resulting in a low yield of the steel plate.
Disclosure of Invention
The invention aims to solve the technical problem of providing a heating and rolling method of a high-chromium alloy steel plate, which adopts a step progressive heating method, greatly reduces the probability of cracks generated in the rolling process of the steel plate, improves the yield of the steel plate in rolling and reduces the production cost.
The invention adopts the following technical scheme: a heating and rolling method of a high-chromium alloy steel plate comprises the working procedures of heating, rolling and stacking slow cooling; the heating procedure is to place the steel ingot in a heating furnace, adopt a weak oxidizing atmosphere, control the oxygen content to be 1-3%, and adopt a four-stage progressive heating mode.
The steel ingot of the invention has the length of 3000-4000mm, the width of 1500-2300mm and the thickness of 200-250 mm.
In the heating procedure, the temperature rise rate is 50-60 ℃/h in the first stage, the temperature is heated to 200 ℃ and 250 ℃, and the temperature is kept for 3-3.5 h; the temperature rise rate of the second stage is 60-70 ℃/h, the temperature is heated to 400-450 ℃, and the temperature is kept for 2-2.5 h; in the third stage, the heating rate is 70-90 ℃/h, the temperature is heated to 800-850 ℃, and the temperature is kept for 1.5-2 h; the temperature rise rate of the fourth stage is 70-90 ℃/h, the temperature is heated to 1250-.
According to the heating process, the temperature of a hearth is lower than 100 ℃ when the steel ingot is placed in a heating furnace.
The rolling procedure of the invention adopts large reduction, the single-pass reduction of the first 3 passes is 20-30mm, the rolling temperature is 1200-1230 ℃, and the final rolling temperature is 920-960 ℃.
The stacking slow cooling process of the invention has the stacking time of 24-32 h.
The Cr content of the steel plate is 4-10%, and the thickness of the steel plate is 10-35 mm.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: (1) by adopting a step progressive heating method, the problem of thermal stress accumulation generated inside the high-chromium alloy steel in the heating process can be effectively avoided, so that the problem that the steel ingot is cracked or even cracked in the heating and subsequent rolling processes by adopting a conventional heating method is avoided; (2) the rolling of the steel plate is completed at high temperature, and the steel plate is stacked and slowly cooled after rolling, so that the internal stress in the steel is further released, and the possibility of cracks of the steel plate is reduced.
Drawings
FIG. 1 is a view showing the surface condition of a steel sheet according to example 1 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The grade of the high-chromium alloy steel plate is SA387Gr9Cl1, the thickness of the finished steel plate is 32mm, and the high-chromium alloy steel plate comprises the following chemical components in percentage by mass: 0.12% of C, 0.69% of Mn, 0.36% of Si, Cr: 9.42 percent of Mo, 1.01 percent of Mo, and the balance of Fe and inevitable impurities.
The production method of the steel plate comprises the working procedures of heating, rolling and stacking slow cooling, and comprises the following specific process steps:
(1) a heating procedure: placing a steel ingot with the length of 3000mm, the width of 1600mm and the thickness of 200mm in a heating furnace with the hearth temperature lower than 100 ℃, adopting a weak oxidation atmosphere, controlling the oxygen content to be 1.5%, adopting a four-stage progressive heating mode, heating to 220 ℃ at the first-stage heating rate of 56 ℃/h, and preserving heat for 3 h; the temperature rise rate of the second stage is 62 ℃/h, the temperature is heated to 430 ℃, and the temperature is kept for 2.2 h; in the third stage, the heating rate is 73 ℃/h, the temperature is heated to 830 ℃, and the temperature is kept for 1.7 h; in the fourth stage, the heating rate is 73 ℃/h, the temperature is increased to 1270 ℃, and the temperature is kept for 3.5 h;
(2) a rolling procedure: adopting large reduction, wherein the reduction of the first 3 times is respectively 22mm, 26mm and 21mm, the initial rolling temperature is 1210 ℃, and the final rolling temperature is 940 ℃;
(3) and after rolling, stacking and slow cooling are carried out, and the stacking time is 26 h.
The surface of the steel sheet has no cracks, as shown in FIG. 1, and the surface of the steel sheet of the other examples is similar to that of example 1, and thus is omitted.
Example 2
The grade of the high-chromium alloy steel plate is SA387Gr9Cl1, the thickness of the finished steel plate is 10mm, and the high-chromium alloy steel plate comprises the following chemical components in percentage by mass: 0.13% of C, 0.62% of Mn, 0.31% of Si, Cr: 9.52 percent of Mo, 1.05 percent of Mo, and the balance of Fe and inevitable impurities.
The production method of the steel plate comprises the working procedures of heating, rolling and stacking slow cooling, and comprises the following specific process steps:
(1) a heating procedure: placing a steel ingot with the length of 3200mm, the width of 1700mm and the thickness of 210mm in a heating furnace with the hearth temperature lower than 100 ℃, adopting a weak oxidation atmosphere, controlling the oxygen content to be 1.0%, adopting a four-stage progressive heating mode, heating to 240 ℃ at the first-stage heating rate of 57 ℃/h, and preserving heat for 3.1 h; the temperature rise rate of the second stage is 65 ℃/h, the temperature is heated to 420 ℃, and the temperature is kept for 2.3 h; in the third stage, the heating rate is 75 ℃/h, the temperature is heated to 830 ℃, and the temperature is kept for 1.6 h; in the fourth stage, the heating rate is 76 ℃/h, the temperature is increased to 1280 ℃, and the temperature is kept for 3.2 h;
(2) a rolling procedure: adopting large reduction, wherein the reduction of the first 3 passes is respectively 27mm, 24mm and 21mm, the initial rolling temperature is 1220 ℃, and the final rolling temperature is 943 ℃;
(3) and after rolling, stacking and slow cooling are carried out, and the stacking time is 27 h.
The steel sheet obtained in this example had no cracks on the surface.
Example 3
The grade of the high-chromium alloy steel plate is SA387Gr5Cl2, the thickness of the finished steel plate is 22mm, and the high-chromium alloy steel plate comprises the following chemical components in percentage by mass: 0.11% of C, 0.64% of Mn, 0.32% of Si, Cr: 4.00 percent of Mo, 1.03 percent of Mo, and the balance of Fe and inevitable impurities.
The production method of the steel plate comprises the working procedures of heating, rolling and stacking slow cooling, and comprises the following specific process steps:
(1) a heating procedure: placing a steel ingot with the length of 4000mm, the width of 1800mm and the thickness of 220mm in a heating furnace with the hearth temperature lower than 100 ℃, adopting a weak oxidation atmosphere, controlling the oxygen content to be 2.0%, adopting a four-stage progressive heating mode, heating to 245 ℃ at the first-stage heating rate of 58 ℃/h, and preserving heat for 3 h; the temperature rise rate of the second stage is 63 ℃/h, the temperature is heated to 425 ℃, and the temperature is kept for 2.2 h; in the third stage, the heating rate is 74 ℃/h, the temperature is heated to 835 ℃, and the temperature is kept for 1.5 h; the fourth stage heating rate is 74 ℃/h, heating is carried out to 1270 ℃, and heat preservation is carried out for 3 h;
(2) a rolling procedure: adopting large reduction, wherein the reduction of the first 3 times is respectively 28mm, 23mm and 22mm, the initial rolling temperature is 1200 ℃, and the final rolling temperature is 953 ℃;
(3) and after rolling, stacking and slow cooling are carried out, and the stacking time is 24 h.
The steel sheet obtained in this example had no cracks on the surface.
Example 4
The grade of the high-chromium alloy steel plate is SA387Gr9Cl2, the thickness of the finished steel plate is 22mm, and the high-chromium alloy steel plate comprises the following chemical components in percentage by mass: 0.13% of C, 0.42% of Mn, 0.35% of Si, Cr: 10.00 percent of Mo, 1.05 percent of Mo, and the balance of Fe and inevitable impurities.
The production method of the steel plate comprises the working procedures of heating, rolling and stacking slow cooling, and comprises the following specific process steps:
(1) a heating procedure: placing a steel ingot with the length of 3700mm, the width of 1500mm and the thickness of 240mm in a heating furnace with the hearth temperature lower than 100 ℃, adopting a weak oxidation atmosphere, controlling the oxygen content to be 1.2%, adopting a four-stage progressive heating mode, heating to 235 ℃ at the first-stage heating rate of 56 ℃/h, and preserving heat for 3.2 h; in the second stage, the heating rate is 60 ℃/h, the temperature is heated to 435 ℃, and the temperature is kept for 2 h; in the third stage, the heating rate is 70 ℃/h, the temperature is heated to 825 ℃, and the temperature is kept for 1.7 h; the heating rate of the fourth stage is 75 ℃/h, the temperature is heated to 1260 ℃, and the temperature is kept for 3 h;
(2) a rolling procedure: adopting large reduction, wherein the reduction of the first 3 passes is respectively 27mm, 24mm and 22mm, the initial rolling temperature is 1210 ℃, and the final rolling temperature is 950 ℃;
(3) and after rolling, stacking and slow cooling are carried out, and the stacking time is 24 h.
The steel sheet obtained in this example had no cracks on the surface.
Example 5
The grade of the high-chromium alloy steel plate is SA387Gr9Cl2, the thickness of the finished steel plate is 27mm, and the high-chromium alloy steel plate comprises the following chemical components in percentage by mass: 0.11% of C, 0.62% of Mn, 0.34% of Si, Cr: 9.41 percent of Mo, 1.03 percent of Mo, and the balance of Fe and inevitable impurities.
The production method of the steel plate comprises the working procedures of heating, rolling and stacking slow cooling, and comprises the following specific process steps:
(1) a heating procedure: placing a steel ingot with the length of 3200mm, the width of 1600mm and the thickness of 210mm in a heating furnace with the hearth temperature lower than 100 ℃, adopting a weak oxidation atmosphere, controlling the oxygen content to be 3.0 percent, adopting a four-stage progressive heating mode, heating to 235 ℃ at the first-stage heating rate of 52 ℃/h, and preserving heat for 3.3 h; the temperature rise rate of the second stage is 61 ℃/h, the temperature is heated to 430 ℃, and the temperature is kept for 2.2 h; in the third stage, the heating rate is 73 ℃/h, the temperature is heated to 835 ℃, and the temperature is kept for 1.5 h; the fourth stage heating rate is 77 ℃/h, heating to 1250 ℃, and keeping the temperature for 3.2 h;
(2) a rolling procedure: adopting large reduction, wherein the reduction of the first 3 passes is respectively 27mm, 25mm and 23mm, the initial rolling temperature is 1215 ℃, and the final rolling temperature is 960 ℃;
(3) and after rolling, stacking and slow cooling are carried out, and the stacking time is 25 h.
The steel sheet obtained in this example had no cracks on the surface.
Example 6
The grade of the high-chromium alloy steel plate is SA387Gr91Cl, the thickness of the finished steel plate is 29mm, and the high-chromium alloy steel plate comprises the following chemical components in percentage by mass: 0.09% of C, 0.46% of Mn, 0.23% of Si, Cr: 9.12%, Mo 0.93%, V0.21%, Nb 0.065%, N0.032%, and the balance Fe and inevitable impurities.
The production method of the steel plate comprises the working procedures of heating, rolling and stacking slow cooling, and comprises the following specific process steps:
(1) a heating procedure: placing a steel ingot which is 3600mm long, 1600mm wide and 250mm thick in a heating furnace with a hearth temperature lower than 100 ℃, adopting a weak oxidation atmosphere, controlling the oxygen content to be 2.5%, adopting a four-stage progressive heating mode, heating to 210 ℃ at a first-stage heating rate of 50 ℃/h, and keeping the temperature for 200 min; the temperature rise rate of the second stage is 68 ℃/h, the temperature is heated to 450 ℃, and the temperature is kept for 2.1 h; in the third stage, the heating rate is 85 ℃/h, the temperature is increased to 810 ℃, and the temperature is kept for 2 h; heating to 1295 ℃ at the temperature rise rate of 85 ℃/h in the fourth stage, and keeping the temperature for 190 min;
(2) a rolling procedure: adopting large reduction, wherein the reduction of the first 3 times is respectively 22mm, 28mm and 23mm, the initial rolling temperature is 1220 ℃, and the final rolling temperature is 925 ℃;
(3) and after rolling, stacking and slowly cooling for 30 h.
The steel sheet obtained in this example had no cracks on the surface.
Example 7
The grade of the high-chromium alloy steel plate is SA387Gr5Cl1, the thickness of the finished steel plate is 14mm, and the high-chromium alloy steel plate comprises the following chemical components in percentage by mass: 0.12% of C, 0.61% of Mn, 0.30% of Si, Cr: 5.13 percent of Mo, 1.01 percent of Mo, and the balance of Fe and inevitable impurities.
The production method of the steel plate comprises the working procedures of heating, rolling and stacking slow cooling, and comprises the following specific process steps:
(1) a heating procedure: placing a steel ingot with the length of 3100mm, the width of 1500mm and the thickness of 200mm in a heating furnace with the hearth temperature lower than 100 ℃, adopting a weak oxidation atmosphere, controlling the oxygen content to be 3.0%, adopting a four-stage progressive heating mode, heating to 225 ℃ at the first-stage heating rate of 55 ℃/h, and keeping the temperature for 3.5 h; the temperature rise rate of the second stage is 65 ℃/h, the temperature is heated to 410 ℃, and the temperature is kept for 140 min; in the third stage, the heating rate is 88 ℃/h, the temperature is increased to 840 ℃, and the temperature is kept for 100 min; in the fourth stage, the heating rate is 83 ℃/h, the temperature is heated to 1290 ℃, and the temperature is kept for 3.3 h;
(2) a rolling procedure: adopting large reduction, wherein the reduction of the first 3 passes is respectively 26mm, 25mm and 20mm, the initial rolling temperature is 1205 ℃, and the final rolling temperature is 930 ℃;
(3) and after rolling, stacking and slowly cooling for 29 h.
The steel sheet obtained in this example had no cracks on the surface.
Example 8
The grade of the high-chromium alloy steel plate is SA387Gr9Cl2, the thickness of the finished steel plate is 25mm, and the high-chromium alloy steel plate comprises the following chemical components in percentage by mass: 0.10% of C, 0.60% of Mn, 0.31% of Si, Cr: 9.05%, Mo 1.02%, and the balance Fe and inevitable impurities.
The production method of the steel plate comprises the working procedures of heating, rolling and stacking slow cooling, and comprises the following specific process steps:
(1) a heating procedure: placing a steel ingot with the length of 3000mm, the width of 1600mm and the thickness of 210mm in a heating furnace with the hearth temperature lower than 100 ℃, adopting a weak oxidation atmosphere, controlling the oxygen content to be 2.8%, adopting a four-stage progressive heating mode, heating to 250 ℃ at the first-stage heating rate of 53 ℃/h, and keeping the temperature for 205 min; the temperature rise rate of the second stage is 66 ℃/h, the temperature is heated to 440 ℃, and the temperature is kept for 2.5 h; in the third stage, the heating rate is 80 ℃/h, the temperature is increased to 800 ℃, and the temperature is kept for 115 min; the heating rate of the fourth stage is 90 ℃/h, the temperature is heated to 1250 ℃, and the heat is preserved for 3.1 h;
(2) a rolling procedure: adopting large reduction, wherein the reduction of the first 3 passes is respectively 25mm, 25mm and 26mm, the initial rolling temperature is 1225 ℃, and the final rolling temperature is 955 ℃;
(3) and after rolling, stacking and slow cooling are carried out, and the stacking time is 31 h.
The steel sheet obtained in this example had no cracks on the surface.
Example 9
The grade of the high-chromium alloy steel plate is SA387Gr91Cl2, the thickness of the finished steel plate is 29mm, and the high-chromium alloy steel plate comprises the following chemical components in percentage by mass: 0.08% of C, 0.41% of Mn, 0.21% of Si, Cr: 9.03 percent of Mo, 0.91 percent of V, 0.20 percent of Nb, 0.061 percent of N, 0.031 percent of N, and the balance of Fe and inevitable impurities.
The production method of the steel plate comprises the working procedures of heating, rolling and stacking slow cooling, and comprises the following specific process steps:
(1) a heating procedure: placing a steel ingot with the length of 3000mm, the width of 1600mm and the thickness of 220mm in a heating furnace with the hearth temperature lower than 100 ℃, adopting a weak oxidation atmosphere, controlling the oxygen content to be 1.5%, adopting a four-stage progressive heating mode, heating to 230 ℃ at the first-stage heating rate of 60 ℃/h, and preserving heat for 3.5 h; the temperature rise rate of the second stage is 67 ℃/h, the temperature is heated to 400 ℃, and the temperature is kept for 2.4 h; in the third stage, the heating rate is 87 ℃/h, the temperature is heated to 845 ℃, and the temperature is kept for 2 h; in the fourth stage, the heating rate is 80 ℃/h, the temperature is increased to 1300 ℃, and the temperature is kept for 200 min;
(2) a rolling procedure: adopting large reduction, wherein the reduction of the first 3 passes is respectively 29mm, 20mm and 27mm, the initial rolling temperature is 1220 ℃, and the final rolling temperature is 920 ℃;
(3) and after rolling, stacking and slow cooling are carried out, and the stacking time is 28 h.
The steel sheet obtained in this example had no cracks on the surface.
Example 10
The grade of the high-chromium alloy steel plate is SA387Gr5Cl2, the thickness of the finished steel plate is 28mm, and the high-chromium alloy steel plate comprises the following chemical components in percentage by mass: 0.12% of C, 0.62% of Mn, 0.32% of Si, Cr: 5.30 percent of Mo, 1.01 percent of Mo, and the balance of Fe and inevitable impurities.
The production method of the steel plate comprises the working procedures of heating, rolling and stacking slow cooling, and comprises the following specific process steps:
(1) a heating procedure: placing a steel ingot with the length of 3200mm, the width of 1700mm and the thickness of 200mm in a heating furnace with the hearth temperature lower than 100 ℃, adopting a weak oxidation atmosphere, controlling the oxygen content to be 2.0 percent, adopting a four-stage progressive heating mode, heating to 200 ℃ at the first-stage heating rate of 60 ℃/h, and keeping the temperature for 190 min; in the second stage, the heating rate is 60 ℃/h, the temperature is raised to 445 ℃, and the temperature is kept for 135 min; in the third stage, the heating rate is 90 ℃/h, the temperature is increased to 815 ℃, and the temperature is kept for 110 min; in the fourth stage, the heating rate is 87 ℃/h, the temperature is increased to 1280 ℃, and the temperature is kept for 3.4 h;
(2) a rolling procedure: adopting large reduction, wherein the reduction of the first 3 times is respectively 20mm, 25mm and 30mm, the initial rolling temperature is 1200 ℃, and the final rolling temperature is 925 ℃;
(3) and after rolling, stacking and slow cooling are carried out, and the stacking time is 31 h.
The steel sheet obtained in this example had no cracks on the surface.
Example 11
The grade of the high-chromium alloy steel plate is SA387Gr9Cl2, the thickness of the finished steel plate is 35mm, and the high-chromium alloy steel plate comprises the following chemical components in percentage by mass: 0.11% of C, 0.61% of Mn, 0.31% of Si, Cr: 8.92 percent of Mo, 1.02 percent of Mo, and the balance of Fe and inevitable impurities.
The production method of the steel plate comprises the working procedures of heating, rolling and stacking slow cooling, and comprises the following specific process steps:
(1) a heating procedure: placing a steel ingot with the length of 3200mm, the width of 2300mm and the thickness of 250mm in a heating furnace with the hearth temperature lower than 100 ℃, adopting a weak oxidation atmosphere, controlling the oxygen content to be 3.0 percent, adopting a four-stage progressive heating mode, heating to 205 ℃ at the first-stage heating rate of 55 ℃/h, and keeping the temperature for 195 min; the temperature rise rate of the second stage is 70 ℃/h, the temperature is heated to 405 ℃, and the temperature is kept for 2 h; in the third stage, the heating rate is 80 ℃/h, the temperature is heated to 850 ℃, and the heat is preserved for 1.6 h; the fourth stage heating rate is 80 ℃/h, heating to 1300 ℃, and keeping the temperature for 205 min;
(2) a rolling procedure: adopting large reduction, wherein the reduction of the first 3 passes is respectively 24mm, 24mm and 25mm, the initial rolling temperature is 1230 ℃, and the final rolling temperature is 920 ℃;
(3) and after rolling, stacking and slowly cooling for 32 h.
The steel sheet obtained in this example had no cracks on the surface.
Example 12
The grade of the high-chromium alloy steel plate is SA387Gr9Cl2, the thickness of the finished steel plate is 18mm, and the high-chromium alloy steel plate comprises the following chemical components in percentage by mass: 0.09% of C, 0.42% of Mn, 0.22% of Si, Cr: 9.16%, Mo 0.93%, V0.22%, Nb 0.061%, N0.031%, and the balance Fe and inevitable impurities.
The production method of the steel plate comprises the working procedures of heating, rolling and stacking slow cooling, and comprises the following specific process steps:
(1) a heating procedure: placing a steel ingot with the length of 3100mm, the width of 1600mm and the thickness of 210mm in a heating furnace with the hearth temperature lower than 100 ℃, adopting a weak oxidation atmosphere, controlling the oxygen content to be 1.0%, adopting a four-stage progressive heating mode, heating to 215 ℃ at the first-stage heating rate of 50 ℃/h, and preserving heat for 3.3 h; the temperature rise rate of the second stage is 63 ℃/h, the temperature is heated to 450 ℃, and the temperature is kept for 145 min; in the third stage, the heating rate is 90 ℃/h, the temperature is heated to 820 ℃, and the temperature is kept for 1.5 h; in the fourth stage, the heating rate is 70 ℃/h, the temperature is heated to 1255 ℃, and the temperature is kept for 3.5 h;
(2) a rolling procedure: adopting large reduction, wherein the reduction of the first 3 times is respectively 30mm, 22mm and 28mm, the initial rolling temperature is 1230 ℃, and the final rolling temperature is 935 ℃;
(3) and after rolling, stacking and slowly cooling for 30 h.
The steel sheet obtained in this example had no cracks on the surface.
As can be seen from figure 1, the surface of the high-chromium alloy steel plate is smooth and has no cracks, the cracking phenomenon is not generated in the production process, no cracks appear on the edge of the rolled steel plate, the rejection rate is low, and the yield is high. The steel plate has good quality and meets the use requirement.
Claims (4)
1. A heating and rolling method of a high-chromium alloy steel plate is characterized by comprising the working procedures of heating, rolling and stacking slow cooling; the heating procedure is that the steel ingot is placed in a heating furnace, the weak oxidation atmosphere is adopted, the oxygen content is controlled to be 1-3%, a four-stage progressive heating mode is adopted, the first-stage heating rate is 50-60 ℃/h, the steel ingot is heated to 200-250 ℃ and the temperature is kept for 3-3.5 h; the temperature rise rate of the second stage is 60-70 ℃/h, the temperature is heated to 400-450 ℃, and the temperature is kept for 2-2.5 h; in the third stage, the heating rate is 70-90 ℃/h, the temperature is heated to 800-850 ℃, and the temperature is kept for 1.5-2 h; the temperature rise rate of the fourth stage is 70-90 ℃/h, the temperature is heated to 1250-;
in the heating process, the temperature of a hearth is lower than 100 ℃ when the steel ingot is placed in a heating furnace;
the Cr content of the steel plate is 4-10%, and the thickness of the steel plate is 10-35 mm.
2. The heating and rolling method of a high-chromium alloy steel plate as claimed in claim 1, wherein the ingot is 3000-4000mm in length, 1500-2300mm in width and 250-200 mm in thickness.
3. The heating and rolling method of high-chromium alloy steel plate as claimed in claim 1, wherein the rolling procedure adopts large reduction, the previous 3 single-pass reduction is 20-30mm, the rolling temperature is 1200-1230 ℃ and the final rolling temperature is 920-960 ℃.
4. The heating and rolling method of a high-chromium alloy steel sheet according to any one of claims 1 to 3, wherein the stacking slow cooling step is performed for a stacking time of 24 to 32 hours.
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