Process for heat treatment of 12Cr1MoVG high pressure tubes after forging

A post-forging heat treatment and high-pressure tube technology, which is applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as poor normalizing effect and affect the progress of mass production of products, achieve fast heating speed, improve product qualification rate, The effect of high production efficiency

Active Publication Date: 2014-09-03
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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Problems solved by technology

[0002] For the 12Cr1MoVG material used in the production of high-pressure boiler tube products in the power station high-pressure boiler industry, the conventional normalizing and tempering process with a long period of time is adopted for a long time during the heat treatment after forging. It takes about 6 days from entering the annealing furnace to being released from the furnace, which seriously affects The progress of mass production of products has been delayed, and the normalizing effect is poor

Method used

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  • Process for heat treatment of 12Cr1MoVG high pressure tubes after forging

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Effect test

Embodiment 1

[0060] A post-forging heat treatment process for 12Cr1MoVG high-pressure pipes, the selected steel type is 12Cr1MoVG, C=0.08~0.15%, Si=0.17~0.37%, Mn=0.40~0.70%, Cr=0.90~1.20%, Mo=0.25~0.35% , V=0.15~0.30%, S≤0.010%, P≤0.025%, high-pressure pipe with a specification of φ455mm, after vacuum degassing, online hydrogen determination [H] content, [H]≥3ppm, 12Cr1MoVG high-pressure pipe after forging The steps of the heat treatment process are as follows:

[0061] Step S01: put the forged 12Cr1MoVG high-pressure tube into an annealing furnace at 500°C and keep it warm for 14 hours;

[0062] Step S02: After the heat preservation is completed, the 12Cr1MoVG high-pressure tube is taken out of the furnace and air-cooled until the surface temperature is 350-400°C;

[0063] Step S03: heat the 12Cr1MoVG high-pressure tube after entering the furnace at 350° C. for 10 hours;

[0064] Step S04: put the 12Cr1MoVG high-pressure tube after heat preservation for 10 hours into hydrogen expansion...

Embodiment 2

[0068] A post-forging heat treatment process for 12Cr1MoVG high-pressure pipes, the selected steel type is 12Cr1MoVG, C=0.08~0.15%, Si=0.17~0.37%, Mn=0.40~0.70%, Cr=0.90~1.20%, Mo=0.25~0.35% , V=0.15~0.30%, S≤0.010%, P≤0.025%, high-pressure pipe with a specification of φ455mm, after vacuum degassing, online hydrogen determination [H] content, [H]≥3ppm, 12Cr1MoVG high-pressure pipe after forging The steps of the heat treatment process are as follows:

[0069] Step S01: put the forged 12Cr1MoVG high-pressure tube into an annealing furnace at 575°C and keep it warm for 13 hours;

[0070] Step S02: After the heat preservation is completed, the 12Cr1MoVG high-pressure tube is taken out of the furnace and air-cooled until the surface temperature is 350-400°C;

[0071] Step S03: heat the 12Cr1MoVG high-pressure tube after entering the furnace at 375° C. for 8 hours;

[0072] Step S04: put the 12Cr1MoVG high-pressure tube after heat preservation for 8 hours into hydrogen expansion a...

Embodiment 3

[0076] A post-forging heat treatment process for 12Cr1MoVG high-pressure pipes, the selected steel type is 12Cr1MoVG, C=0.08~0.15%, Si=0.17~0.37%, Mn=0.40~0.70%, Cr=0.90~1.20%, Mo=0.25~0.35% , V=0.15~0.30%, S≤0.010%, P≤0.025%, high-pressure pipe with a specification of φ455mm, after vacuum degassing, online hydrogen determination [H] content, [H]≥3ppm, 12Cr1MoVG high-pressure pipe after forging The steps of the heat treatment process are as follows:

[0077] Step S01: put the forged 12Cr1MoVG high-pressure tube into an annealing furnace at 650°C and keep it warm for 12 hours;

[0078] Step S02: After the heat preservation is completed, the 12Cr1MoVG high-pressure tube is taken out of the furnace and air-cooled until the surface temperature is 350-400°C;

[0079] Step S03: heat the 12Cr1MoVG high-pressure tube after entering the furnace at 400° C. for 6 hours;

[0080] Step S04: Put the 12Cr1MoVG high-pressure tube after heat preservation for 6 hours into hydrogen expansion a...

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Abstract

The invention relates to a process for heat treatment of 12Cr1MoVG high pressure tubes after forging. After vacuum degassing, [H] contents are detected by online hydrogen determination, so that processes for heat treatment of the 12Cr1MoVG high pressure tubes after forging for are respectively formulated against two conditions that [H] is greater than or equal to 3ppm and [H] is less than 3ppm; a process of hydrogen diffusion and then normalizing is adopted for the 12Cr1MoVG high pressure tube of which [H] content is greater than or equal to 3ppm detected by online hydrogen determination, a rate-limiting cooling stage in the original process is cancelled, the hydrogen diffusion time at 650 DEG C is appropriately prolonged, and temperature rise is directly carried out after hydrogen diffusion is ended so as to carry out normalizing, and the workpiece is hoisted down from a lathe after normalizing and is then subjected to air cooling, so that the annealing time is greatly shortened; after vacuum degassing, except for optimizing according to above process, as for the 12Cr1MoVG high pressure tube of which [H] content is less than or equal to 3ppm detected by online hydrogen determination, a heat insulation stage at 500-650 DEGC as well as hydrogen diffusion annealing and normalizing temperature rise rate limiting stages are not required, and thus the annealing process peroid is further shortened. The invention discloses the process for heat treatment of the 12Cr1MoVG high pressure tubes after forging, which has the advantages that the production peroid is effectively shortened, the productivity of high pressure tubes after forging is increased and the normalizing effect is improved.

Description

technical field [0001] The invention belongs to the production field of high-pressure boiler tube products, and in particular relates to a post-forging heat treatment process for 12Cr1MoVG high-pressure tubes used in the power station high-pressure boiler industry. Background technique [0002] For the 12Cr1MoVG material used in the production of high-pressure boiler tube products in the power station high-pressure boiler industry, the conventional normalizing and tempering process with a long period of time is adopted for a long time during the post-forging heat treatment. It takes about 6 days from entering the annealing furnace to being released from the furnace, which seriously affects The progress of mass production of products has been affected, and the normalizing effect is relatively poor. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a heat treatment process for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/08
Inventor 赵颖赵玉李亚平
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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