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Accelerated cooling method after 12Cr2Mo1VR steel plate quenching slot normalizing

A technology of accelerated cooling and quenching tank, which is applied in the direction of quenching device, heat treatment equipment, furnace, etc., can solve the problem of insufficient cooling capacity of the core, achieve the effects of improving water temperature uniformity, accelerating cooling speed, and reducing performance differences

Inactive Publication Date: 2018-07-03
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method of accelerated cooling after normalizing in the quenching tank of a large thickness 12Cr2Mo1VR steel plate, which solves the problem of insufficient cooling capacity of the core when the thickness ≥ 150mm 12Cr2Mo1VR steel plate is accelerated cooling after normalizing in the quenching tank, and ensures that the steel plate Improve the performance of the heart, and reduce the performance difference between the upper and lower surfaces of the steel plate and the performance of the head and tail

Method used

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  • Accelerated cooling method after 12Cr2Mo1VR steel plate quenching slot normalizing
  • Accelerated cooling method after 12Cr2Mo1VR steel plate quenching slot normalizing

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The specification of the large thickness 12Cr2Mo1VR steel plate in this example is 162*1850*13450mm, the chemical composition and mass percentage of the steel plate are: C: 0.13%, Si: 0.05%, Al: 0.024%, Mn: 0.58%, Cr: 2.36% , Mo: 1.03%, V: 0.32%, P: 0.005%, S: 0.003%, As: 0.007%, Sn: 0.005%, Sb: 0.001%, and the balance is Fe and unavoidable impurities.

[0023] In this embodiment, the production method of accelerated cooling after normalizing the large thickness 12Cr2Mo1VR steel plate in the quenching tank is as follows:

[0024] When the steel plate is normalized and cooled for the first time, the water temperature in the quenching tank is 30°C. The time for the steel plate to enter the water from the furnace is 60s. After the steel plate enters the water, the air stirring is turned on immediately, and the water volume in the upper part of the quenching tank is 500m 3 / h, the water entering the bottom is 1500m 3 / h, the water temperature in the quenching tank during t...

Embodiment 2

[0028] The specification of the large thickness 12Cr2Mo1VR steel plate in this example is 190*2000*9850mm, the chemical composition and mass percentage of the steel plate are: C: 0.12%, Si: 0.08%, Al: 0.019%, Mn: 0.54%, Cr: 2.41% , Mo: 1.02%, V: 0.35%, P: 0.006%, S: 0.002%, As: 0.006%, Sn: 0.002%, Sb: 0.001%, and the balance is Fe and unavoidable impurities.

[0029] In this embodiment, the production method of accelerated cooling after normalizing the large thickness 12Cr2Mo1VR steel plate in the quenching tank is as follows:

[0030] When the steel plate is normalized and cooled for the first time, the water temperature in the quenching tank is 28°C. The time for the steel plate to enter the water from the furnace is 49s. After the steel plate enters the water, the air stirring is turned on immediately, and the water volume in the upper part of the quenching tank is 510m 3 / h, the water entering the bottom is 1530m 3 / h, the water temperature in the quenching tank during th...

Embodiment 3

[0034] The specification of the large thickness 12Cr2Mo1VR steel plate in this example is 180*1760*10440mm, the chemical composition and mass percentage of the steel plate are: C: 0.14%, Si: 0.06%, Al: 0.021%, Mn: 0.54%, Cr: 2.40% , Mo: 1.01%, V: 0.34%, P: 0.006%, S: 0.004%, As: 0.005%, Sn: 0.003%, Sb: 0.001%, and the balance is Fe and unavoidable impurities.

[0035] In this embodiment, the production method of accelerated cooling after normalizing the large thickness 12Cr2Mo1VR steel plate in the quenching tank is as follows:

[0036] When the steel plate is normalized and cooled for the first time, the water temperature in the quenching tank is 30°C. The time for the steel plate to enter the water from the furnace is 53s. After the steel plate enters the water, the air stirring is turned on immediately, and the water volume in the upper part of the quenching tank is 550m 3 / h, the water entering the bottom is 1570m 3 / h, the water temperature in the quenching tank during t...

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Abstract

The invention discloses an accelerated cooling method after 12Cr2Mo1VR steel plate quenching slot normalizing. The method comprises the following steps of: controlling a water temperature of a quenching slot, controlling time from tapping to water entry of a steel plate, and controlling to start an air stirring process and a secondary normalizing pre-turnover process, wherein during the secondarynormalizing pre-turnover process, the steel plate needs to be normalized twice, and turnover needs to be firstly performed before secondary normalizing. After the method is adopted for normalizing, a12Cr2Mo1VR steel plate with a thickness greater than and equal to 150 mm is cooled in an accelerated mode, so that surface and core performances as well as die-welding performance of the treated steelplate can meet GB713-2014 requirements and are relatively stable, and performance difference among upper and lower surfaces as well as a head and a tail of the steel plate is relatively small.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an accelerated cooling method after normalizing in a quenching tank of a large-thickness 12Cr2Mo1VR steel plate. Background technique [0002] Compared with 12Cr2Mo1R, 12Cr2Mo1VR has improved strength, hydrogen resistance, temper embrittlement resistance, hydrogen-induced peeling resistance, etc. 12Cr2Mo1VR steel plates with a thickness ≥ 150mm are more and more used in the manufacture of large-scale hydrogenation reactors . Because the thickness of the steel plate is too large, it has exceeded the production capacity of the quenching machine, so the 12Cr2Mo1VR steel plate with a thickness ≥ 150mm can only be normalized through the bottom furnace and the quenching tank. In order to improve the quenching capacity of extra-thick steel plates, Wuyang Iron and Steel Co., Ltd. has improved the original quenching tank. The improvements include: 1. Add an air stirring de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/28C21D1/62C21D9/00
CPCC21D1/28C21D1/62C21D9/0062C21D9/0081
Inventor 邓建军赵文忠李杰龙杰侯敬超袁锦程吴艳阳牛红星尹卫江李样兵王东阳
Owner WUYANG IRON & STEEL
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