CN110408758B - Heating rolling method of P91 steel plate - Google Patents
Heating rolling method of P91 steel plate Download PDFInfo
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- CN110408758B CN110408758B CN201910667223.6A CN201910667223A CN110408758B CN 110408758 B CN110408758 B CN 110408758B CN 201910667223 A CN201910667223 A CN 201910667223A CN 110408758 B CN110408758 B CN 110408758B
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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Abstract
The invention belongs to the technical field of metallurgy, and relates to a heating and rolling method of a P91 steel plate, which comprises the working procedures of heating and rolling; the heating process adopts low-temperature steel annealing and a four-stage progressive heating process, and the rolling process adopts a temperature-increasing rolling process; the low-temperature steel stewing step is that the charging temperature of the steel ingot is less than or equal to 200 ℃, and the steel stewing time is 8-10 hours after charging. The invention reduces the phenomenon of cracking of the steel plate in the rolling process, improves the forming performance of the steel plate and reduces the production cost by controlling the heating and rolling processes. The obtained steel plate has good surface quality and stable performance, the yield strength is more than or equal to 560MPa, the tensile strength is more than or equal to 680MPa, and the impact energy is more than or equal to 120J.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a heating rolling method of a P91 steel plate.
Background
The P91 steel plate is improved on the basis of U.S. 9Cr-1Mo, is used for boilers and pressure vessels, and has the properties of higher oxidation resistance, steam corrosion resistance, good creep rupture strength and the like. Since the 80 s of the last century, some thermal power plants in China introduced P91 steel and developed homemade research works. Because the content of alloy elements in the steel plate is high, if a traditional heating rolling mode is adopted, the P91 steel plate is easy to crack after being rolled, even the blank is directly cracked after being taken out of a heating furnace and can only be scrapped, and the economic loss is very large. Therefore, the research on the steel heating rolling process is particularly important.
Disclosure of Invention
The invention provides a heating rolling method of a P91 steel plate, which adopts low-temperature steel braising and a step progressive heating method to reduce the phenomenon of explosion cracking of the steel plate in the rolling process and reduce the production cost.
In order to solve the technical problems, the invention adopts the following technical scheme:
a heating rolling method of a P91 steel plate comprises the steps of heating and rolling, wherein the heating process adopts low-temperature steel stewing and a four-stage progressive heating process, and the rolling process adopts a temperature-increasing rolling process; the low-temperature steel stewing step is that the charging temperature of the steel ingot is less than or equal to 200 ℃, and the steel stewing time is 8-10 hours after charging.
In the heating procedure, the four-stage progressive heating step is that after low-temperature steel stewing of the steel ingot is finished, the steel ingot is heated to 650-670 ℃ at a heating rate of 40-60 ℃/h and then is kept warm for 2-3 hours; heating to 850-870 ℃ at a heating rate of 60-80 ℃/h, and then preserving heat for 2-3 hours; heating to 1150-1170 ℃ at a heating rate of 200-300 ℃/h, and then preserving heat for 2-3 hours; finally, heating to 1250-1270 ℃ at a heating rate of 200-300 ℃/h and preserving the heat for 2-3 h.
The rolling process adopts temperature-raising rolling, the initial rolling temperature is 1050-1100 ℃, steel is not dried in the rolling process, hot rolling is directly finished, the final rolling temperature is 950-980 ℃, and watering is not needed after rolling.
And stacking the rolled steel plates, wherein the stacking temperature is more than or equal to 550 ℃, the stacking time is 48-52 hours, and the unstacking temperature is 100-150 ℃.
The steel plate comprises the following chemical components in percentage by mass: c: 0.09-0.12%, Si: 0.3-0.4%, Mn: 0.4-0.5%, Cr: 8.5-9.5%, Mo: 0.95-1.05%, V: 0.20-0.25%, Al is less than or equal to 0.02%, Ni is less than or equal to 0.4%, P is less than or equal to 0.02%, S is less than or equal to 0.01%, N: 0.03 to 0.07%, Nb: 0.06-0.1% of Fe and inevitable impurities as the rest.
In order to improve the rolling yield of the steel plate, the invention determines a heat preservation platform in the heating process according to the phase diagram of the steel plate, and determines the heating rate according to the phase transformation rate. The internal stress of the blank is reduced by the heat preservation of the phase platform and the proper heating rate, and the blank can be effectively prevented from being cracked. The hot rolling direct forming in the steel plate rolling process can avoid the phenomenon of incapability of rolling due to the fact that the temperature of the blank is too low, and the rolling qualified rate is improved. The process of watering and stacking after rolling is not needed after rolling, so that the internal stress of the steel plate after rolling can be further reduced, and the rolling yield of the steel plate is improved.
The forming performance of the steel plate can be obviously improved by controlling the heating temperature and the heating speed of the P91 blank and the blank rolling process, the burst phenomenon in the rolling process is obviously reduced, the surface quality of the obtained steel plate is good, the performance is stable, the yield strength is not less than 560MPa, the tensile strength is not less than 680MPa, and the impact energy is not less than 120J.
Drawings
FIG. 1 shows the rolled shape of the steel plate in 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 steel plate P91 of the embodiment comprises the following chemical components in percentage by mass: c: 0.12%, Si: 0.40%, Mn: 0.50%, Cr: 9.5%, Mo: 1.05%, V: 0.25%, Al: 0.02%, Ni: 0.40%, P: 0.02%, S: 0.01%, N: 0.07%, Nb: 0.10%, the balance being Fe and unavoidable impurities.
The production method of the steel plate comprises the following steps:
(1) a heating procedure: adopting low-temperature steel braising and a four-stage progressive heating process; the charging temperature of the steel ingot is 200 ℃, and the steel is braised for 8 hours after charging; then heating to 670 ℃ at the heating rate of 50 ℃/h, and then preserving heat for 2 h; heating to 870 ℃ at the heating rate of 80 ℃/h, and then preserving heat for 2 h; heating to 1170 ℃ at the heating rate of 300 ℃/h, and then preserving heat for 2 h; finally heating to 1270 ℃ at the heating rate of 300 ℃/h and then preserving heat for 2 h;
(2) a rolling procedure: adopting a temperature-controlled rolling process, wherein the initial rolling temperature is 1100 ℃, steel is not dried in the rolling process, the hot rolling is directly finished, the final rolling temperature is 980 ℃, and watering is not needed after rolling;
(3) after rolling, stacking treatment is carried out, wherein the stacking temperature is 550 ℃, the stacking time is 48h, and the unstacking temperature is 150 ℃.
The P91 steel plate obtained in the embodiment has the yield strength of 590MPa, the tensile strength of 693MPa and the impact energy of more than 200J. The shape of the rolled steel plate is intact, the defects such as cracking and the like do not occur, the appearance of the steel plate is shown in figure 1, and the appearance of the steel plate in other embodiments is similar to that in figure 1, so the defects are omitted.
Example 2
The steel plate P91 of the embodiment comprises the following chemical components in percentage by mass: c: 0.09%, Si: 0.30%, Mn: 0.40%, Cr: 8.5%, Mo: 0.95%, V: 0.20%, Al: 0.01%, Ni: 0.35%, P: 0.01%, S: 0.009%, N: 0.03%, Nb: 0.06%, the balance being Fe and unavoidable impurities.
(1) A heating procedure: adopting low-temperature steel braising and a four-stage progressive heating process; the charging temperature of the steel ingot is 180 ℃, and the steel is braised for 10 hours after charging; heating to 650 ℃ at the heating rate of 40 ℃/h, and then preserving heat for 3 h; heating to 850 ℃ at the heating rate of 60 ℃/h, and then preserving heat for 3 h; heating to 1150 ℃ at the heating rate of 200 ℃/h, and then preserving heat for 3 h; finally heating to 1250 ℃ at the heating rate of 200 ℃/h and then preserving heat for 3 h;
(2) a rolling procedure: adopting a temperature-controlled rolling process, wherein the initial rolling temperature is 1050 ℃, the steel is not aired in the rolling process, the hot rolling is directly finished, the final rolling temperature is 950 ℃, and watering is not needed after rolling;
(3) after rolling, stacking treatment is carried out, wherein the stacking temperature is 570 ℃, the stacking time is 52h, and the unstacking temperature is 100 ℃.
The P91 steel plate obtained in the embodiment has good plate shape after rolling and has no defects such as cracking and the like. The yield strength 584MPa, the tensile strength 705MPa and the impact energy of the steel plate are all more than 159J.
Example 3
The steel plate P91 of the embodiment comprises the following chemical components in percentage by mass: c: 0.09%, Si: 0.30%, Mn: 0.40%, Cr: 9.5%, Mo: 0.95%, V: 0.21%, Al: 0.015%, Ni: 0.30%, P: 0.015%, S: 0.008%, N: 0.05%, Nb: 0.07%, the balance being Fe and unavoidable impurities.
(1) A heating procedure: adopting low-temperature steel braising and a four-stage progressive heating process; the charging temperature of the steel ingot is 190 ℃, and the steel is braised for 8.5 hours after charging; heating to 655 ℃ at a heating rate of 46 ℃/h, and then preserving heat for 2.6 h; heating to 860 ℃ at the heating rate of 75 ℃/h, and then preserving heat for 2.4 h; then heating to 1155 ℃ at the heating rate of 230 ℃/h, and then preserving heat for 2.4 h; finally heating to 1260 ℃ at the heating rate of 280 ℃/h, and then preserving the heat for 2.4 h;
(2) a rolling procedure: adopting a temperature-controlled rolling process, wherein the initial rolling temperature is 1080 ℃, the steel is not dried in the rolling process, the hot rolling is directly finished, the final rolling temperature is 970 ℃, and watering is not needed after rolling;
(3) after rolling, stacking treatment is carried out, wherein the stacking temperature is 565 ℃, the stacking time is 50h, and the unstacking temperature is 120 ℃.
The P91 steel plate obtained in the embodiment has good plate shape after rolling and has no defects such as cracking and the like. The yield strength of the steel plate is 569MPa, the tensile strength is 684MPa, and the impact energy reaches more than 139J.
Example 4
The steel plate P91 of the embodiment comprises the following chemical components in percentage by mass: c: 0.11%, Si: 0.35%, Mn: 0.43%, Cr: 8.7%, Mo: 0.97%, V: 0.22%, Al: 0.017%, Ni: 0.29%, P: 0.012%, S: 0.009%, N: 0.06%, Nb: 0.09%, the balance being Fe and unavoidable impurities.
(1) A heating procedure: adopting low-temperature steel braising and a four-stage progressive heating process; the charging temperature of the steel ingot is 170 ℃, and the steel is braised for 10 hours after charging; then heating to 665 ℃ at the heating rate of 48 ℃/h, and then preserving heat for 2.3 h; then heating to 870 ℃ at the heating rate of 71 ℃/h, and preserving heat for 2.2 h; heating to 1165 ℃ at the heating rate of 280 ℃/h, and then preserving heat for 2.3 h; finally heating to 1265 ℃ at the heating rate of 240 ℃/h, and then preserving heat for 2.1 h;
(2) a rolling procedure: adopting a temperature-controlled rolling process, wherein the initial rolling temperature is 1090 ℃, the steel is not dried in the rolling process, the hot rolling is directly finished, the final rolling temperature is 975 ℃, and watering is not needed after rolling;
(3) after rolling, stacking treatment is carried out, wherein the stacking temperature is 576 ℃, the stacking time is 49h, and the unstacking temperature is 140 ℃.
The P91 steel plate obtained in the embodiment has good plate shape after rolling and has no defects such as cracking and the like. The yield strength of the steel plate is 578MPa, the tensile strength is 706MPa, and the impact energy reaches more than 187J.
Example 5
The steel plate P91 of the embodiment comprises the following chemical components in percentage by mass: c: 0.10%, Si: 0.38%, Mn: 0.42%, Cr: 8.9%, Mo: 1.00%, V: 0.23%, Al: 0.014%, Ni: 0.20%, P: 0.007%, S: 0.005%, N: 0.04%, Nb: 0.06%, the balance being Fe and unavoidable impurities.
(1) A heating procedure: adopting low-temperature steel braising and a four-stage progressive heating process; the charging temperature of the steel ingot is 200 ℃, and the steel is braised for 9 hours after charging; heating to 660 ℃ at a heating rate of 40 ℃/h, and then preserving heat for 2.5 h; heating to 855 ℃ at the heating rate of 69 ℃/h, and then preserving heat for 2.3 h; heating to 1155 ℃ at the heating rate of 300 ℃/h, and then preserving heat for 2.5 h; finally heating to 1256 ℃ at a heating rate of 250 ℃/h, and then preserving heat for 2.7 h;
(2) a rolling procedure: adopting a temperature-controlled rolling process, wherein the initial rolling temperature is 1060 ℃, the steel is not aired in the rolling process, the hot rolling is directly finished, the final rolling temperature is 955 ℃, and watering is not needed after rolling;
(3) after rolling, stacking treatment is carried out, wherein the stacking temperature is 580 ℃, the stacking time is 48.5 hours, and the unstacking temperature is 110 ℃.
The P91 steel plate obtained in the embodiment has good plate shape after rolling and has no defects such as cracking and the like. The plate yield strength is 562MPa, the tensile strength is 697MPa, and the impact energy is more than 201J.
Example 6
The steel plate P91 of the embodiment comprises the following chemical components in percentage by mass: c: 0.09%, Si: 0.39%, Mn: 0.50%, Cr: 9.0%, Mo: 0.99%, V: 0.24%, Al: 0.018%, Ni: 0.10%, P: 0.010%, S: 0.006%, N: 0.07%, Nb: 0.08%, the balance being Fe and unavoidable impurities.
(1) A heating procedure: adopting low-temperature steel braising and a four-stage progressive heating process; the charging temperature of the steel ingot is 182 ℃, and the steel is braised for 9.5 hours after charging; then heating to 650 ℃ at the heating rate of 45 ℃/h, and then preserving heat for 2.1 h; heating to 860 ℃ at the heating rate of 65 ℃/h, and then preserving heat for 2.5 h; heating to 1159 ℃ at the heating rate of 210 ℃/h, and then preserving heat for 2.8 h; finally heating to 1255 ℃ at a heating rate of 210 ℃/h, and then preserving heat for 2 h;
(2) a rolling procedure: adopting a temperature-controlled rolling process, wherein the initial rolling temperature is 1055 ℃, the steel is not cooled in the rolling process, the hot rolling is directly finished, the final rolling temperature is 960 ℃, and watering is not needed after rolling;
(3) after the rolling is finished, stacking treatment is carried out, wherein the stacking temperature is 560 ℃, the stacking time is 51h, and the unstacking temperature is 105 ℃.
The P91 steel plate obtained in the embodiment has good plate shape after rolling and has no defects such as cracking and the like. The yield strength of the steel plate is 579MPa, the tensile strength is 702MPa, and the impact energy reaches more than 157J.
Example 7
The steel plate P91 of the embodiment comprises the following chemical components in percentage by mass: c: 0.12%, Si: 0.32%, Mn: 0.46%, Cr: 8.5%, Mo: 1.01%, V: 0.23%, Al: 0.015%, Ni: 0.21%, P: 0.005%, S: 0.003%, N: 0.05%, Nb: 0.07%, the balance being Fe and unavoidable impurities.
(1) A heating procedure: adopting low-temperature steel braising and a four-stage progressive heating process; the charging temperature of the steel ingot is 150 ℃, and the steel is braised for 8.6 hours after charging; then heating to 655 ℃ at the heating rate of 43 ℃/h, and then preserving heat for 2 h; heating to 865 ℃ at the heating rate of 70 ℃/h, and then preserving heat for 2.6 h; heating to 1169 ℃ at the heating rate of 253 ℃/h, and then preserving heat for 2.6 h; finally heating to 1254 ℃ at a heating rate of 200 ℃/h, and then preserving heat for 2.8 h;
(2) a rolling procedure: adopting a temperature-controlled rolling process, wherein the initial rolling temperature is 1085 ℃, steel is not aired in the rolling process, hot rolling is directly carried out to form a material, the final rolling temperature is 963 ℃, and watering is not carried out after rolling;
(3) after rolling, stacking treatment is carried out, wherein the stacking temperature is 570 ℃, the stacking time is 51.5h, and the unstacking temperature is 120 ℃.
The P91 steel plate obtained in the embodiment has good plate shape after rolling and has no defects such as cracking and the like. The yield strength of the steel plate is 588MPa, the tensile strength is 697MPa, and the impact energy reaches above 178J.
Example 8
The steel plate P91 of the embodiment comprises the following chemical components in percentage by mass: c: 0.10%, Si: 0.32%, Mn: 0.40%, Cr: 9.2%, Mo: 0.98%, V: 0.21%, Al: 0.017%, Ni: 0.25%, P: 0.02%, S: 0.007%, N: 0.035%, Nb: 0.09%, the balance being Fe and unavoidable impurities.
(1) A heating procedure: adopting low-temperature steel braising and a four-stage progressive heating process; the charging temperature of the steel ingot is 160 ℃, and the steel is braised for 9.4 hours after charging; heating to 660 ℃ at a heating rate of 50 ℃/h, and then preserving heat for 2.4 h; heating to 853 ℃ at the heating rate of 67 ℃/h, and then preserving heat for 2.6 h; heating to 1160 ℃ at the heating rate of 270 ℃/h, and then preserving heat for 3 h; finally, heating to 1265 ℃ at the heating rate of 230 ℃/h, and then preserving heat for 2.4 h;
(2) a rolling procedure: adopting a warm-keeping rolling process, wherein the initial rolling temperature is 1095 ℃, steel is not dried in the rolling process, hot rolling is directly carried out to form a material, the final rolling temperature is 950 ℃, and watering is not carried out after rolling;
(3) and after rolling, stacking treatment is carried out, wherein the stacking temperature is 555 ℃, the stacking time is 50h, and the unstacking temperature is 140 ℃.
The P91 steel plate obtained in the embodiment has good plate shape after rolling and has no defects such as cracking and the like. The yield strength of the steel plate is 574MPa, the tensile strength is 689MPa, and the impact energy reaches above 152J.
Example 9
The steel plate P91 of the embodiment comprises the following chemical components in percentage by mass: c: 0.098%, Si: 0.31%, Mn: 0.45%, Cr: 9.3%, Mo: 0.99%, V: 0.21%, Al: 0.017%, Ni: 0.30%, P: 0.008%, S: 0.010%, N: 0.06%, Nb: 0.08%, the balance being Fe and unavoidable impurities.
(1) A heating procedure: adopting low-temperature steel braising and a four-stage progressive heating process; the charging temperature of the steel ingot is 180 ℃, and the steel is braised for 8.5 hours after charging; then heating to 670 ℃ at the heating rate of 48 ℃/h, and then preserving heat for 2.5 h; heating to 868 ℃ at the heating rate of 63 ℃/h, and then preserving heat for 2.2 h; heating to 1167 ℃ at the heating rate of 260 ℃/h, and then preserving heat for 2.2 h; finally heating to 1270 ℃ at the heating rate of 270 ℃/h and then preserving the heat for 2.6 h;
(2) a rolling procedure: adopting a temperature-controlled rolling process, wherein the initial rolling temperature is 1060 ℃, the steel is not cooled in the rolling process, the hot rolling is directly finished, the final rolling temperature is 960 ℃, and watering is not needed after rolling;
(3) after rolling, stacking treatment is carried out, wherein the stacking temperature is 580 ℃, the stacking time is 49 hours, and the unstacking temperature is 100 ℃.
The P91 steel plate obtained in the embodiment has good plate shape after rolling and has no defects such as cracking and the like. The yield strength of the steel plate is 579MPa, the tensile strength is 693Pa, and the impact energy reaches more than 123J.
Example 10
The steel plate P91 of the embodiment comprises the following chemical components in percentage by mass: c: 0.11%, Si: 0.36%, Mn: 0.47%, Cr: 8.8%, Mo: 0.97%, V: 0.24%, Al: 0.01%, Ni: 0.15%, P: 0.017%, S: 0.005%, N: 0.05%, Nb: 0.10%, the balance being Fe and unavoidable impurities.
(1) A heating procedure: adopting low-temperature steel braising and a four-stage progressive heating process; the charging temperature of the steel ingot is 150 ℃, and the steel is braised for 9 hours after charging; then heating to 665 ℃ at the heating rate of 45 ℃/h, and then preserving heat for 2.8 h; heating to 860 ℃ at the heating rate of 80 ℃/h, and then preserving heat for 2 h; heating to 1162 ℃ at the heating rate of 290 ℃/h, and then preserving heat for 2.5 h; finally heating to 1255 ℃ at a heating rate of 220 ℃/h, and then preserving heat for 2.2 h;
(2) a rolling procedure: adopting a temperature-controlled rolling process, wherein the initial rolling temperature is 1070 ℃, the steel is not cooled in the rolling process, the hot rolling is directly finished, the final rolling temperature is 975 ℃, and watering is not needed after rolling;
(3) after rolling is finished, stacking treatment is carried out, wherein the stacking temperature is 590 ℃, the stacking time is 48h, and the unstacking temperature is 130 ℃.
The P91 steel plate obtained in the embodiment has good plate shape after rolling and has no defects such as cracking and the like. The yield strength of the steel plate is 601MPa, the tensile strength is 714a, and the impact energy is more than 174J.
Example 11
The steel plate P91 of the embodiment comprises the following chemical components in percentage by mass: c: 0.12%, Si: 0.30%, Mn: 0.50%, Cr: 9.4%, Mo: 0.98%, V: 0.25%, Al: 0.018%, Ni: 0.05%, P: 0.010%, S: 0.010%, N: 0.04%, Nb: 0.06%, the balance being Fe and unavoidable impurities.
(1) A heating procedure: adopting low-temperature steel braising and a four-stage progressive heating process; the charging temperature of the steel ingot is 200 ℃, and the steel is braised for 9.2 hours after charging; then heating to 652 ℃ at the heating rate of 43 ℃/h, and then preserving heat for 2.6 h; heating to 865 ℃ at the heating rate of 74 ℃/h, and then preserving heat for 3 h; heating to 1153 ℃ at the heating rate of 220 ℃/h, and then preserving heat for 2.4 h; finally heating to 1260 ℃ at the heating rate of 260 ℃/h, and then preserving heat for 3 h;
(2) a rolling procedure: adopting a warm-rolling process, wherein the initial rolling temperature is 1069 ℃, steel is not aired in the rolling process, the hot rolling is directly finished, the final rolling temperature is 973 ℃, and watering is not needed after rolling;
(3) after rolling, stacking treatment is carried out, wherein the stacking temperature is 569 ℃, the stacking time is 50.5h, and the unstacking temperature is 145 ℃.
The P91 steel plate obtained in the embodiment has good plate shape after rolling and has no defects such as cracking and the like. The yield strength 603MPa, the tensile strength 700Ma and the impact energy of the steel plate are all more than 148J.
Example 12
The steel plate P91 of the embodiment comprises the following chemical components in percentage by mass: c: 0.10%, Si: 0.36%, Mn: 0.47%, Cr: 9.0%, Mo: 1.02%, V: 0.20%, Al: 0.012%, Ni: 0.30%, P: 0.018%, S: 0.008%, N: 0.07%, Nb: 0.10%, the balance being Fe and unavoidable impurities.
(1) A heating procedure: adopting low-temperature steel braising and a four-stage progressive heating process; the charging temperature of the steel ingot is 140 ℃, and the steel is braised for 8 hours after charging; heating to 660 ℃ at the heating rate of 40 ℃/h, and then preserving heat for 3 h; heating to 850 ℃ at the heating rate of 70 ℃/h, and then preserving heat for 2.7 h; heating to 1160 ℃ at the heating rate of 240 ℃/h, and then preserving heat for 2.7 h; finally heating to 1260 ℃ at the heating rate of 290 ℃/h, and then preserving the heat for 2.3 h;
(2) a rolling procedure: adopting a temperature-controlled rolling process, wherein the initial rolling temperature is 1075 ℃, the steel is not aired in the rolling process, the hot rolling is directly finished, the final rolling temperature is 980 ℃, and watering is not needed after rolling;
(3) after rolling, stacking treatment is carried out, wherein the stacking temperature is 560 ℃, the stacking time is 51h, and the unstacking temperature is 125 ℃.
The P91 steel plate obtained in the embodiment has good plate shape after rolling and has no defects such as cracking and the like. The yield strength of the steel plate is 598MPa, the tensile strength is 706Ma, and the impact energy reaches more than 203J.
As can be seen from FIG. 1, the surface of the P91 steel plate of the invention is smooth and has no cracks, and no cracking phenomenon is generated in the production process. The steel plate has good quality and meets the use requirements according to the mechanical properties of the steel plate.
Claims (3)
1. A method for heating and rolling a P91 steel sheet, comprising heating and rolling steps, characterized in that: the heating process adopts low-temperature steel annealing and a four-stage progressive heating process, and the rolling process adopts a temperature-increasing rolling process; the low-temperature steel stewing step is that the charging temperature of steel ingots is less than or equal to 200 ℃, and the steel stewing time is 8-10 hours after charging; in the heating procedure, the four-stage progressive heating step is that after low-temperature steel stewing of the steel ingot is finished, the steel ingot is heated to 650-670 ℃ at a heating rate of 40-50 ℃/h and then is kept warm for 2-3 hours; heating to 850-870 ℃ at a heating rate of 60-80 ℃/h, and then preserving heat for 2-3 hours; heating to 1150-1170 ℃ at a heating rate of 200-300 ℃/h, and then preserving heat for 2-3 hours; finally heating to 1250-1270 ℃ at a heating rate of 200-300 ℃/h and preserving heat for 2-3 h;
the steel plate comprises the following chemical components in percentage by mass: c: 0.09-0.12%, Si: 0.3-0.4%, Mn: 0.4-0.5%, Cr: 8.5-9.5%, Mo: 0.95-1.05%, V: 0.20-0.25%, Al is less than or equal to 0.02%, Ni is less than or equal to 0.4%, P is less than or equal to 0.02%, S is less than or equal to 0.01%, N: 0.03 to 0.07%, Nb: 0.06-0.1% of Fe and inevitable impurities as the rest.
2. The heating rolling method of the P91 steel plate, according to claim 1, characterized in that the rolling process adopts temperature-controlled rolling, the initial rolling temperature is 1050-1100 ℃, steel is not cooled in the rolling process, the hot rolling is directly finished, the final rolling temperature is 950-980 ℃, and watering is not needed after rolling.
3. The method for heating and rolling the P91 steel plate as claimed in claim 1, wherein the steel plate is stacked after rolling, the stacking temperature is not less than 550 ℃, the stacking time is 48-52 h, and the unstacking temperature is 100-150 ℃.
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