Heat treatment process for fine grain austenitic steel pipe bend

An austenitic and fine-grained technology is applied in the field of heat treatment process for fine-grained austenitic steel pipe elbows to achieve the effects of low temperature range, inhibiting grain growth, and improving elbow performance.

Inactive Publication Date: 2012-06-13
SHANGHAI BOILER WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, there is no good heat treatment process that can solve this problem in China, so it is urgent to invent a new heat treatment process.

Method used

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  • Heat treatment process for fine grain austenitic steel pipe bend
  • Heat treatment process for fine grain austenitic steel pipe bend
  • Heat treatment process for fine grain austenitic steel pipe bend

Examples

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Embodiment Construction

[0017] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0018] The heat treatment process for the fine-grained austenitic steel pipe elbow provided by the present invention includes: heat-treating the fine-grained austenitic steel pipe elbow at 900-1050° C. for 2-120 minutes in a heat treatment furnace, and then taking it out of the furnace for cooling , The cooling method adopts air cooling or water cooling.

[0019] The heat treatment temperature adopted in this embodiment is 950° C., heat preservation for 30 minutes, and air cooling.

[0020] The fine-grained austenitic stainless steel elbow used in this example is Super304H austenitic stainless steel, and its chemical composition is shown in Table 1.

[0021] Table 1: Chemical composition (Wt%) of fine-grained austenitic stainless steel elbows.

[0022] chemical element C mn Si S P Cr measured value 0.07 0.64 0.28 ...

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Abstract

The invention discloses a heat treatment process for a fine grain austenitic steel pipe bend. The process comprises the following steps: carrying out heat treatment on the fine grain austenitic steel pipe bend in a heat treatment furnace at a temperature of 900 to 1050 DEG C for 2 to 120 min, discharging the bend out and cooling the bend by using air or water; detecting the hardness and the grain size of the bend after heat treatment is finished. The heat treatment process provided in the invention enables residual stress after pipe bending to be effectively eliminated, the grain size to be effectively controlled, excellent performance of fine grain austenitic stainless steel in a manufacture process to be retained and production cost to be saved.

Description

technical field [0001] The invention relates to a heat treatment process for a steel pipe elbow, in particular to a heat treatment process for a fine-grained austenite steel pipe elbow. Background technique [0002] With the rapid development of the domestic power plant boiler industry, the steam temperature and pressure of the boiler are getting higher and higher, and there are higher requirements for the performance of high-temperature heat-resistant materials, so that fine-grained austenitic stainless steel has been widely used. Compared with ordinary austenitic stainless steel, fine-grained austenitic stainless steel has better high-temperature durability strength and high-temperature steam oxidation resistance. [0003] Fine grains are the guarantee for improving the high-temperature steam oxidation resistance of austenitic stainless steel. Through fine graining treatment, the channels for Cr elements to diffuse to the surface during steam oxidation can be improved, mak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/08
Inventor 李宝虎金用强王崇斌
Owner SHANGHAI BOILER WORKS
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