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A manufacturing process of 2.25cr1mo0.25v steel large wall thickness hydrogenation forging

A 2.25cr1mo0.25v, manufacturing process technology, applied in the field of large-wall thickness hydrogenated forgings, can solve the problems of poor comprehensive performance, large temperature variation and distribution inhomogeneity, and large thickness.

Active Publication Date: 2021-03-12
CITIC HEAVY INDUSTRIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrogenation reactor, as a representative of large-wall hydrogenation forgings, is the main reaction device in the petroleum refining and chemical industry. Working for a long time under complex conditions such as large wall thickness hydrogenated forgings due to their large thickness, heating and cooling, large temperature changes and uneven distribution, resulting in poor overall performance

Method used

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  • A manufacturing process of 2.25cr1mo0.25v steel large wall thickness hydrogenation forging
  • A manufacturing process of 2.25cr1mo0.25v steel large wall thickness hydrogenation forging
  • A manufacturing process of 2.25cr1mo0.25v steel large wall thickness hydrogenation forging

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The composition of the 2.25Cr1Mo0.25V steel used in embodiment 1 and embodiment 2 is: C 0.15%, Si 0.07%, Mn0.57%, P 0.0047%, S 0.0005%, Cr 2.47%, Mo 1.02%, V 0.32 %, Ti 0.015%, B0.0016%, Nb 0.038%, Ni 0.18%, Al 0.04%, As 0.0053%, Sn 0.0025%, Sb 0.0013%, Cu 0.025%, Ca 0.001%, [H] 0.00010%, [ O]≤0.0012%, [N]≤0.0072%, and the balance is Fe and unavoidable impurities.

Embodiment 3

[0039] The composition of the 2.25Cr1Mo0.25V steel used in embodiment 3 and embodiment 4 is: C 0.14%, Si 0.097%, Mn0.55%, P 0.0062%, S 0.0005%, Cr 2.49%, Mo 1.09%, V 0.32 %, Ti 0.015%, B0.0014%, Nb 0.022%, Ni 0.17%, Al 0.0016, As 0.0053%, Sn 0.0025%, Sb 0.0013%, Cu 0.025%, Ca 0.001%, [H] 0.00010%, [O ]≤0.0012%, [N]≤0.0072%, and the balance is Fe and unavoidable impurities.

[0040] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0041] Example 1

[0042] Preliminary heat treatment: Put the hydrogenated forging with large wall thickness into the heat treatment furnace, keep it at 600°C for 2 hours, heat the heat treatment furnace at a heating rate of ≤60°C / h to 910±10°C and keep it at the temperature, holding time: 2h / 100mm according to the wall thickness, Then cool down at ≤15°C / h to 650±10°C for heat preservation, heat preservation time: according to the wall thickness ...

Embodiment 2

[0046] Preliminary heat treatment: Put the hydrogenated forging with large wall thickness into the heat treatment furnace, keep it at 650°C for 6 hours, heat the heat treatment furnace at a heating rate of ≤60°C / h to 910±10°C and keep it warm. The holding time: according to the wall thickness 2h / 100mm, Then cool down at ≤15°C / h and keep warm at 650±10°C, holding time: according to the wall thickness 2h / 100mm, cool down to 250°C with the furnace and leave the furnace for air cooling;

[0047] Quenching: heat the annealed forging at 350°C for 6 hours, heat it to 710±10°C at a heating rate of ≤80°C / h and hold it for 8 hours, heat it at a heating rate of ≤50°C / h to 950±10°C and hold it for 12 hours, and leave the furnace Water cooling for 90 minutes;

[0048] Tempering: Heat the quenched forging to 350°C for 6 hours, heat it to 690±10°C at a heating rate of ≤50°C / h and hold for 14 hours, and then air-cool it to obtain a hydrogenated forging with a large wall thickness that meets t...

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Abstract

The invention discloses a manufacturing process of hydrogenated forgings with large wall thickness of 2.25Cr1Mo0.25V steel. The manufacturing process includes: first heating the forgings after preliminary heat treatment to 300°C-350°C for 2-6h, and then heating to 710±10 ℃ for 4‑8 hours, then heated to 930℃‑960℃ for 8‑12h, then water-cooled after being released from the furnace; then heated to 300℃‑350℃ for 2‑6h, and then heated to 690±10℃ for 10 hours ‑14h, out of the furnace and air-cooled to obtain a large-wall thickness hydrogenated forging that meets the requirements; among them, the chemical composition of 2.25Cr1Mo0.25V steel is calculated by weight percentage: C 0.13‑0.16%, Si≤0.1%, Mn 0.50‑0.60% , P≤0.008%, S≤0.005%, Cr 2.40‑2.60%, Mo 0.95‑1.04%, V 0.28‑0.35%, Ti≤0.03%, B 0.001‑0.002%, Nb 0.03‑0.05%, Ni 0.15‑0.20 %, Al 0.02‑0.04%, As≤0.007%, Sn≤0.004%, Sb≤0.003%, Cu≤0.08%, Ca≤0.015%, [H]≤0.00015%, [O]≤0.0020%, [N] ≤0.008%, the balance is Fe and unavoidable impurities. The chemical composition of the 2.25Cr1Mo0.25V steel used for forgings in the present invention matches the manufacturing process, so that the obtained large-wall-thick hydrogenation forgings have excellent comprehensive properties and uniform and fine structures.

Description

technical field [0001] The invention relates to the technical field of large-wall-thick hydrogenation forgings, in particular to a manufacturing process of large-wall-thickness hydrogenation forgings of 2.25Cr1Mo0.25V steel. Background technique [0002] With the increasingly tight demand for energy, the demand for petrochemical equipment is gradually increasing. Hydrogenation reactor, as a representative of large-wall hydrogenation forgings, is the main reaction device in the petroleum refining and chemical industry. Working for a long time under complex conditions such as large wall thickness hydrogenated forgings has poor comprehensive performance due to its large thickness, large temperature changes and uneven distribution during heating and cooling. [0003] 2.25Cr1Mo0.25V steel is a low-alloy heat-resistant steel. It is an improved steel for large-wall forgings. Due to the addition of alloy elements such as chromium, molybdenum, vanadium, and titanium, it has higher s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C22C38/50C22C38/54C22C38/48C22C38/42C22C38/06C21D9/00C21D1/18
Inventor 马窦琴宋亚虎张广威郎庆斌赵学谦毛宽亮庞庆海王文焱张连振林乙丑陈明王博郭亚森郑三妹胡寒婷孙胜伟王明飞
Owner CITIC HEAVY INDUSTRIES CO LTD