CN110541065A - Postweld heat treatment process of chromium-molybdenum submerged arc welded pipe - Google Patents
Postweld heat treatment process of chromium-molybdenum submerged arc welded pipe Download PDFInfo
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- CN110541065A CN110541065A CN201910764949.1A CN201910764949A CN110541065A CN 110541065 A CN110541065 A CN 110541065A CN 201910764949 A CN201910764949 A CN 201910764949A CN 110541065 A CN110541065 A CN 110541065A
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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
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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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
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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Abstract
the invention discloses a postweld heat treatment process of a chromium-molybdenum submerged arc welded pipe, which comprises the working procedures of preheating, heating, heat preservation, slow cooling and cooling of the welded pipe. The postweld heat treatment process creatively increases the early preheating process, optimizes key technical parameters such as temperature rise and drop rate, total in-furnace time, slow cooling process and the like by combining the components of the chromium-molybdenum welded pipe, greatly reduces the welding crack defects of the welded pipe after postweld heat treatment, and effectively solves the problems that the chromium-molybdenum welded pipe is easy to generate heat cracks and delay cracks in a welding seam and a heat affected zone after welding. The performance of the chromium-molybdenum welded pipe treated by the postweld heat treatment process of the invention at the 1/2-part of the wall thickness is as follows: the average yield strength is more than or equal to 390MPa, the average tensile strength is 520-570MPa, the impact energy at the wall thickness of 1/2 ℃ below zero is more than or equal to 150J, and the mechanical property of the welded pipe is stable and good.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a postweld heat treatment process of a chromium-molybdenum submerged-arc welded pipe.
Background
the chrome molybdenum steel pipe has good obdurability matching, excellent welding performance and good forming performance, and is widely applied to the design and manufacture of auxiliary pipelines of key core equipment in petrochemical industry and coal chemical industry. However, with the rapid development of petrochemical and coal chemical industries in China, the technical requirements of users on the chromium-molybdenum steel pipe are higher and higher, and part of the requirements are even close to or reach the limit level of the steel.
The purpose of the heat treatment after welding of the chromium molybdenum steel pipe is generally to eliminate welding stress and reduce or avoid the generation of welding crack defects. Under the new situation, the conventional postweld heat treatment process of the chromium-molybdenum steel pipe is adopted, so that the phenomenon of incomplete elimination of welding stress of the chromium-molybdenum steel pipe after welding is easily caused, the unplanned rate (rejection rate) of welding pipe cracks is more than or equal to 4.5 percent, welding defects such as welding cracks and the like are caused, and great hidden danger is brought to equipment safety while economic loss is caused.
in order to meet the requirements of the development trend, optimization and innovation of the heat treatment process of the chromium-molybdenum steel pipe are urgently needed to solve the problems that the chromium-molybdenum welded pipe is easy to generate hot cracks and delayed cracks in a welding seam and a heat affected zone in the welding process.
disclosure of Invention
the invention aims to solve the technical problem of providing a postweld heat treatment process of a chromium-molybdenum submerged arc welded pipe. The welding crack defect of the postweld heat treatment process is greatly reduced, and the problems that the chromium-molybdenum welded pipe is easy to generate heat cracks and delay cracks in a welding seam and a heat affected zone in the welding process are effectively solved; meanwhile, the obtained chromium-molybdenum welded pipe has stable and good mechanical property.
in order to solve the technical problems, the invention adopts the technical scheme that: a postweld heat treatment process of a chromium-molybdenum submerged arc welded pipe comprises the working procedures of preheating, heating, heat preservation, slow cooling and cooling of the welded pipe, and specifically comprises the following steps:
(1) preheating a welded pipe: the welding tube is put into a furnace at the temperature of 20-25 ℃, and is heated to the temperature of 300-350 ℃ at the heating rate of 30-150 ℃/h and is kept for 20-25 min;
(2) heating the welded pipe: after the preheating of the welding tube is finished, the welding tube is not taken out of the furnace, and the temperature is uniformly increased to 695-plus 705 ℃ at the temperature increase rate of 30-150 ℃/h;
(3) Heat preservation of welded pipes: heating the welding pipe to 695-705 ℃, and keeping the temperature for 2-2 h8 min;
(4) Slow cooling of welded pipes: after the heat preservation is finished, slowly cooling to 300-400 ℃ at a slow cooling rate of 30-150 ℃/h at a constant speed;
(5) repeating the heating, heat preservation and slow cooling processes of the steps (2), (3) and (4) for four times, wherein the total heat preservation time is 8-8 h32 min;
(6) Cooling the welded pipe: after the heating, heat preservation and slow cooling processes are repeatedly executed for four times, the welded pipe is taken out of the furnace and is cooled to 20-25 ℃ in air.
The wall thickness of the chromium-molybdenum submerged arc welded pipe is 25.88-40.56 mm.
the invention relates to a chromium-molybdenum submerged arc welding pipe, which comprises the following components in percentage by weight: cr: 0.94 to 1.10%, Mo: 0.40-0.44%.
the performance of the chromium-molybdenum submerged arc welded pipe treated by the postweld heat treatment process at the position of 1/2 parts of the wall thickness of the chromium-molybdenum steel pipe is as follows: the average yield strength is more than or equal to 390MPa, the average tensile strength is 520-570MPa, and the impact energy at the wall thickness of 1/2 ℃ below zero is more than or equal to 150J.
adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. compared with the conventional heat treatment process, the postweld heat treatment process creatively increases the early preheating process, optimizes key technical parameters such as temperature rise and drop rate, total in-furnace time, slow cooling process and the like by combining the components of the chromium-molybdenum welded pipe, greatly reduces the welding crack defects of the welded pipe after the postweld heat treatment, ensures that the planned external rate of the welded pipe cracks is less than or equal to 1 percent, and effectively solves the problems of heat cracks and delayed cracks easily generated in a welding seam and a heat affected zone after the welding of the chromium-molybdenum welded pipe is implemented. 2. The performance of the chromium-molybdenum welded pipe treated by the postweld heat treatment process of the invention at the 1/2-part of the wall thickness is as follows: the average yield strength is more than or equal to 390MPa, the average tensile strength is 520-570MPa, the impact energy at the wall thickness of 1/2 ℃ below zero is more than or equal to 150J, and the mechanical property of the welded pipe is stable and good.
Detailed Description
the present invention will be described in further detail with reference to specific examples.
example 1
the chromium molybdenum welded pipe of the embodiment: cr: 0.94%, Mo: 0.40% and a thickness of 25.88 mm.
The postweld heat treatment process of the chrome-molybdenum submerged arc welded pipe comprises the working procedures of preheating, heating, heat preservation, slow cooling and cooling of the welded pipe, and specifically comprises the following steps:
(1) Preheating a welded pipe: putting the welded tube into a furnace at 20 ℃, heating to 300 ℃ at the heating rate of 150 ℃/h, and keeping for 20 min;
(2) Heating the welded pipe: after preheating of the welded pipe, the welded pipe is not taken out of the furnace, and the temperature is uniformly increased to 705 ℃ at the heating rate of 150 ℃/h;
(3) heat preservation of welded pipes: heating the welded pipe to 705 ℃, and preserving heat for 2 h;
(4) slow cooling of welded pipes: after the heat preservation is finished, slowly cooling to 400 ℃ at a slow cooling rate of 150 ℃/h at a constant speed;
(5) repeating the heating, heat preservation and slow cooling processes of the steps (2), (3) and (4) for four times, wherein the total heat preservation time is 8 h;
(6) cooling the welded pipe: after the heating, heat preservation and slow cooling processes are repeatedly executed for four times, the welded pipe is taken out of the furnace and is cooled to 20 ℃ by air.
After the chromium-molybdenum submerged arc welded pipe is treated by the post-welding heat treatment process, the chromium-molybdenum welded pipe has no crack defects or cracking phenomena on the surface and has good external quality through detection; performance at 1/2 part of the wall thickness of the chrome molybdenum welded pipe: the average yield strength is 430MPa, the average tensile strength is 570MPa, the impact energy at the position with the thickness of 1/2 and the temperature of 20 ℃ below zero is 200J, and the mechanical property of the welded pipe is stable and good.
Example 2
the chromium molybdenum welded pipe of the embodiment: cr: 1.01%, Mo: 0.42% and a thickness of 30.96 mm.
the postweld heat treatment process of the chrome-molybdenum submerged arc welded pipe comprises the working procedures of preheating, heating, heat preservation, slow cooling and cooling of the welded pipe, and specifically comprises the following steps:
(1) Preheating a welded pipe: putting the welded tube into a furnace at 23 ℃, heating to 320 ℃ at the heating rate of 140 ℃/h, and keeping for 22.5 min;
(2) Heating the welded pipe: after the preheating of the welded pipe is finished, the welded pipe is not taken out of the furnace, and the temperature is uniformly increased to 700 ℃ at the temperature increase rate of 130 ℃/h;
(3) heat preservation of welded pipes: heating the welded pipe to 700 ℃, and preserving heat for 2h2 min;
(4) Slow cooling of welded pipes: after the heat preservation is finished, slowly cooling to 350 ℃ at a slow cooling rate of 140 ℃/h at a constant speed;
(5) repeating the heating, heat preservation and slow cooling processes of the steps (2), (3) and (4) for four times, wherein the total heat preservation time is 8h8 min;
(6) Cooling the welded pipe: after the heating, heat preservation and slow cooling processes are repeatedly executed for four times, the welded pipe is taken out of the furnace and is cooled to 24 ℃ in air.
After the chromium-molybdenum submerged arc welded pipe is treated by the post-welding heat treatment process, the chromium-molybdenum welded pipe has no crack defects or cracking phenomena on the surface and has good external quality through detection; performance at 1/2 part of the wall thickness of the chrome molybdenum welded pipe: the average yield strength is 405MPa, the average tensile strength is 546MPa, the impact energy is 181J at the position with the thickness of 1/2 and the temperature of minus 20 ℃, and the mechanical property of the welded pipe is stable and good.
example 3
the chromium molybdenum welded pipe of the embodiment: cr: 1.10%, Mo: 0.44% and a thickness of 40.56 mm.
the postweld heat treatment process of the chrome-molybdenum submerged arc welded pipe comprises the working procedures of preheating, heating, heat preservation, slow cooling and cooling of the welded pipe, and specifically comprises the following steps:
(1) preheating a welded pipe: putting the welded tube into a furnace at 25 ℃, heating to 350 ℃ at a heating rate of 130 ℃/h, and keeping for 25 min;
(2) heating the welded pipe: after preheating of the welded pipe, the welded pipe is not taken out of the furnace, and the temperature is uniformly increased to 695 ℃ at the temperature increase rate of 125 ℃/h;
(3) Heat preservation of welded pipes: heating the welded pipe to 695 ℃, and preserving heat for 2h3 min;
(4) slow cooling of welded pipes: after the heat preservation is finished, slowly cooling to 300 ℃ at a slow cooling rate of 130 ℃/h at a constant speed;
(5) repeating the heating, heat preservation and slow cooling processes of the steps (2), (3) and (4) for four times, wherein the total heat preservation time is 8h12 min;
(6) Cooling the welded pipe: after the heating, heat preservation and slow cooling processes are repeatedly executed for four times, the welded pipe is taken out of the furnace and is cooled to 25 ℃ in air.
after the chromium-molybdenum submerged arc welded pipe is treated by the post-welding heat treatment process, the chromium-molybdenum welded pipe has no crack defects or cracking phenomena on the surface and has good external quality through detection; performance at 1/2 part of the wall thickness of the chrome molybdenum welded pipe: the average yield strength is 390MPa, the average tensile strength is 520MPa, the impact energy at the thickness of 1/2 ℃ below zero is 150J, and the mechanical property of the welded pipe is stable and good.
Example 4
The chromium molybdenum welded pipe of the embodiment: cr: 0.97%, Mo: 0.41% and 34.72mm thick.
The postweld heat treatment process of the chrome-molybdenum submerged arc welded pipe comprises the working procedures of preheating, heating, heat preservation, slow cooling and cooling of the welded pipe, and specifically comprises the following steps:
(1) preheating a welded pipe: putting the welded tube into a furnace at 22 ℃, heating to 340 ℃ at a heating rate of 105 ℃/h, and keeping for 23 min;
(2) Heating the welded pipe: after preheating of the welded pipe, the welded pipe is not taken out of the furnace, and the temperature is uniformly increased to 698 ℃ at the temperature increase rate of 110 ℃/h;
(3) heat preservation of welded pipes: heating the welded pipe to 698 ℃, and preserving the heat for 2h4 min;
(4) slow cooling of welded pipes: after the heat preservation is finished, slowly cooling to 320 ℃ at a slow cooling rate of 95 ℃/h at a constant speed;
(5) Repeating the heating, heat preservation and slow cooling processes of the steps (2), (3) and (4) for four times, wherein the total heat preservation time is 8h16 min;
(6) Cooling the welded pipe: after the heating, heat preservation and slow cooling processes are repeatedly executed for four times, the welded pipe is taken out of the furnace and is cooled to 21 ℃ in air.
After the chromium-molybdenum submerged arc welded pipe is treated by the post-welding heat treatment process, the chromium-molybdenum welded pipe has no crack defects or cracking phenomena on the surface and has good external quality through detection; performance at 1/2 part of the wall thickness of the chrome molybdenum welded pipe: the average yield strength is 418MPa, the average tensile strength is 532MPa, the impact energy at the thickness of 1/2 ℃ below zero is 176J, and the mechanical property of the welded pipe is stable and good.
Example 5
The chromium molybdenum welded pipe of the embodiment: cr: 1.05%, Mo: 0.43 percent and the thickness of 28.32 mm.
the postweld heat treatment process of the chrome-molybdenum submerged arc welded pipe comprises the working procedures of preheating, heating, heat preservation, slow cooling and cooling of the welded pipe, and specifically comprises the following steps:
(1) preheating a welded pipe: putting the welded tube into a furnace at 24 ℃, heating to 310 ℃ at a heating rate of 85 ℃/h, and keeping for 21 min;
(2) heating the welded pipe: after preheating of the welded pipe, the welded pipe is not taken out of the furnace, and the temperature is increased to 703 ℃ at a constant speed at a heating rate of 105 ℃/h;
(3) heat preservation of welded pipes: heating the welded pipe to 703 ℃, and preserving the heat for 2h5 min;
(4) Slow cooling of welded pipes: after the heat preservation is finished, slowly cooling to 330 ℃ at a slow cooling rate of 95 ℃/h at a constant speed;
(5) repeating the heating, heat preservation and slow cooling processes of the steps (2), (3) and (4) for four times, wherein the total heat preservation time is 8h and 20 min;
(6) cooling the welded pipe: after the heating, heat preservation and slow cooling processes are repeatedly executed for four times, the welded pipe is taken out of the furnace and is cooled to 22 ℃ in air.
after the chromium-molybdenum submerged arc welded pipe is treated by the post-welding heat treatment process, the chromium-molybdenum welded pipe has no crack defects or cracking phenomena on the surface and has good external quality through detection; performance at 1/2 part of the wall thickness of the chrome molybdenum welded pipe: the average yield strength is 425MPa, the average tensile strength is 551MPa, the impact energy at the position with the thickness of 1/2 and the temperature of 20 ℃ below zero is 192J, and the mechanical property of the welded pipe is stable and good.
Example 6
The chromium molybdenum welded pipe of the embodiment: cr: 1.08%, Mo: 0.42% and 37.21mm thick.
The postweld heat treatment process of the chrome-molybdenum submerged arc welded pipe comprises the working procedures of preheating, heating, heat preservation, slow cooling and cooling of the welded pipe, and specifically comprises the following steps:
(1) preheating a welded pipe: putting the welded tube into a furnace at 21 ℃, heating to 330 ℃ at a heating rate of 62 ℃/h, and keeping for 24 min;
(2) Heating the welded pipe: after preheating of the welded pipe, the welded pipe is not taken out of the furnace, and the temperature is increased to 699 ℃ at a constant speed at a temperature increase rate of 75 ℃/h;
(3) Heat preservation of welded pipes: heating the welded pipe to 699 ℃, and preserving heat for 2h6 min;
(4) slow cooling of welded pipes: after the heat preservation is finished, slowly cooling to 370 ℃ at a slow cooling rate of 57 ℃/h at a constant speed;
(5) Repeating the heating, heat preservation and slow cooling processes of the steps (2), (3) and (4) for four times, wherein the total heat preservation time is 8h and 24 min;
(6) Cooling the welded pipe: after the heating, heat preservation and slow cooling processes are repeatedly executed for four times, the welded pipe is taken out of the furnace and is cooled to 23 ℃ by air.
After the chromium-molybdenum submerged arc welded pipe is treated by the post-welding heat treatment process, the chromium-molybdenum welded pipe has no crack defects or cracking phenomena on the surface and has good external quality through detection; performance at 1/2 part of the wall thickness of the chrome molybdenum welded pipe: the average yield strength is 435MPa, the average tensile strength is 563MPa, the impact energy at the thickness of 1/2 and the temperature of minus 20 ℃ is 195J, and the mechanical property of the welded pipe is stable and good.
Example 7
the chromium molybdenum welded pipe of the embodiment: cr: 0.95%, Mo: 0.43 percent and the thickness is 32.56 mm.
The postweld heat treatment process of the chrome-molybdenum submerged arc welded pipe comprises the working procedures of preheating, heating, heat preservation, slow cooling and cooling of the welded pipe, and specifically comprises the following steps:
(1) preheating a welded pipe: putting the welded tube into a furnace at 22.5 ℃, heating to 325 ℃ at the heating rate of 48 ℃/h, and keeping for 22 min;
(2) Heating the welded pipe: after preheating of the welded pipe, the welded pipe is not taken out of the furnace, and the temperature is increased to 696 ℃ at a constant speed at a temperature increase rate of 30 ℃/h;
(3) Heat preservation of welded pipes: heating the welded pipe to 696 ℃, and preserving heat for 2h7 min;
(4) Slow cooling of welded pipes: after the heat preservation is finished, slowly cooling to 390 ℃ at a slow cooling rate of 54 ℃/h at a constant speed;
(5) Repeating the heating, heat preservation and slow cooling processes of the steps (2), (3) and (4) for four times, wherein the total heat preservation time is 8h28 min;
(6) cooling the welded pipe: after the heating, heat preservation and slow cooling processes are repeatedly executed for four times, the welded pipe is taken out of the furnace and is cooled to 21.5 ℃ in air.
After the chromium-molybdenum submerged arc welded pipe is treated by the post-welding heat treatment process, the chromium-molybdenum welded pipe has no crack defects or cracking phenomena on the surface and has good external quality through detection; performance at 1/2 part of the wall thickness of the chrome molybdenum welded pipe: the average yield strength is 427MPa, the average tensile strength is 565MPa, the impact energy at the thickness of 1/2 ℃ below zero is 188J, and the mechanical property of the welded pipe is stable and good.
Example 8
The chromium molybdenum welded pipe of the embodiment: cr: 1.03%, Mo: 0.41% and 35.18mm thick.
the postweld heat treatment process of the chrome-molybdenum submerged arc welded pipe comprises the working procedures of preheating, heating, heat preservation, slow cooling and cooling of the welded pipe, and specifically comprises the following steps:
(1) preheating a welded pipe: putting the welded tube into a furnace at 24.5 ℃, heating to 336 ℃ at the heating rate of 30 ℃/h, and keeping for 23.5 min;
(2) Heating the welded pipe: after preheating of the welded pipe, the welded pipe is not taken out of the furnace, and the temperature is increased to 701 ℃ at a constant speed at a temperature increase rate of 47 ℃/h;
(3) heat preservation of welded pipes: heating the welded pipe to 701 ℃, and preserving heat for 2h8 min;
(4) slow cooling of welded pipes: after the heat preservation is finished, slowly cooling to 310 ℃ at a slow cooling rate of 30 ℃/h at a constant speed;
(5) Repeating the heating, heat preservation and slow cooling processes of the steps (2), (3) and (4) for four times, wherein the total heat preservation time is 8h32 min;
(6) cooling the welded pipe: after the heating, heat preservation and slow cooling processes are repeatedly executed for four times, the welded pipe is taken out of the furnace and is cooled to 22.5 ℃ in air.
after the chromium-molybdenum submerged arc welded pipe is treated by the post-welding heat treatment process, the chromium-molybdenum welded pipe has no crack defects or cracking phenomena on the surface and has good external quality through detection; performance at 1/2 part of the wall thickness of the chrome molybdenum welded pipe: the average yield strength is 415MPa, the average tensile strength is 538MPa, the impact energy at the position with the thickness of 1/2 and the temperature of minus 20 ℃ is 183J, and the mechanical property of the welded pipe is stable and good.
through the statistics of multiple batches of production, the planned out-of-plan rate (rejection rate) of defects such as welded pipe cracks and the like generated by adopting the heat treatment process is less than or equal to 1.0 percent, the planned out-of-plan rate of the defects such as the welded pipe cracks and the like is reduced, the problems of hot cracks and delayed cracks easily generated in a welding line and a heat affected zone after the chromium-molybdenum welded pipe is welded are effectively solved, and the effect is obvious.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (4)
1. The postweld heat treatment process of the chrome molybdenum submerged arc welded pipe is characterized by comprising the working procedures of preheating, heating, heat preservation, slow cooling and cooling of the welded pipe, and specifically comprises the following steps:
(1) preheating a welded pipe: the welding tube is put into a furnace at the temperature of 20-25 ℃, and is heated to the temperature of 300-350 ℃ at the heating rate of 30-150 ℃/h and is kept for 20-25 min;
(2) heating the welded pipe: after the preheating of the welding tube is finished, the welding tube is not taken out of the furnace, and the temperature is uniformly increased to 695-plus 705 ℃ at the temperature increase rate of 30-150 ℃/h;
(3) heat preservation of welded pipes: heating the welding pipe to 695-705 ℃, and keeping the temperature for 2-2 h8 min;
(4) Slow cooling of welded pipes: after the heat preservation is finished, slowly cooling to 300-400 ℃ at a slow cooling rate of 30-150 ℃/h at a constant speed;
(5) Repeating the heating, heat preservation and slow cooling processes of the steps (2), (3) and (4) for four times, wherein the total heat preservation time is 8-8 h32 min;
(6) cooling the welded pipe: after the heating, heat preservation and slow cooling processes are repeatedly executed for four times, the welded pipe is taken out of the furnace and is cooled to 20-25 ℃ in air.
2. the post-weld heat treatment process for a chrome molybdenum submerged arc welded pipe according to claim 1, wherein the wall thickness of the chrome molybdenum submerged arc welded pipe is 25.88-40.56 mm.
3. The post-weld heat treatment process for a chrome molybdenum submerged arc welded pipe according to claim 1, wherein in the chrome molybdenum submerged arc welded pipe: cr: 0.94 to 1.10%, Mo: 0.40-0.44%.
4. The post-weld heat treatment process for the chrome-molybdenum submerged arc welded pipe according to any one of claims 1 to 3, wherein the performance of the chrome-molybdenum submerged arc welded pipe after the post-weld heat treatment process at the wall thickness of 1/2 parts of the chrome-molybdenum steel pipe is as follows: the average yield strength is more than or equal to 390MPa, the average tensile strength is 520-570MPa, and the impact energy at the wall thickness of 1/2 ℃ below zero is more than or equal to 150J.
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| CN111663027A (en) * | 2020-06-10 | 2020-09-15 | 舞阳钢铁有限责任公司 | Postweld heat treatment process of chromium-molybdenum steel plate for gasification furnace |
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Application publication date: 20191206 |