Stainless heat-resistant alloy steel seamless steel tube and preparation method thereof

A technology of seamless steel pipe and production method, which is applied to furnace types, furnaces, electric furnaces, etc., can solve the problems of restricting the production and development of ultra-supercritical power station boilers, untimely supply, insufficient resources, etc., and achieves stable and qualified chemical composition. The effect of preventing secondary pollution and accurate process

Inactive Publication Date: 2010-03-10
ZHEJIANG JIULI HI TECH METALS
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Problems solved by technology

At present, my country is still unable to produce such high-performance boiler tubes, and can only rely on imports. Imported tubes are not only expensive, but also insufficient in resources, and the supply is not timely, which seriously restricts the production and development of my country's ultra-supercritical power plant boilers.

Method used

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  • Stainless heat-resistant alloy steel seamless steel tube and preparation method thereof
  • Stainless heat-resistant alloy steel seamless steel tube and preparation method thereof
  • Stainless heat-resistant alloy steel seamless steel tube and preparation method thereof

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Embodiment Construction

[0017] The present invention will be further described below with embodiment.

[0018] A stainless heat-resistant alloy steel seamless steel pipe that is especially suitable for ultra-supercritical power plant boilers. The used pipe billet bar is Ф210mm, and its chemical composition is calculated by weight percentage: C 0.04~0.10, Si≤0.75, Mn ≤2.00, P≤0.03, S≤0.03, Ni 17.00~23.00, Cr 24.00~26.00, Nb+Ta0.20~0.60, N 0.15~0.35, the balance is Fe and unavoidable trace elements.

[0019] The production method of the stainless heat-resistant alloy steel seamless steel pipe comprises the following process steps:

[0020] Tube billet bar → acceptance → straightening → cutting head and tail → peeling → segmentation → drilling → end face processing → grinding → cleaning → preheating → primary heating → lubrication → reaming → secondary heating → lubrication → extrusion Mother pipe → water quenching → straightening → sawing → pickling → inspection → rough cold rolling → oil removal → so...

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Abstract

The invention relates to a stainless heat-resistant alloy steel seamless steel tube and a preparation method thereof. The seamless steel tube comprises the following chemical compositions by weight percent: 0.04-0.10% of C, 0.75% or less of Si, 2.00% or less of Mn, 0.03% or less of P, 0.03% or less of S, 17.00-23.00% of Ni, 24.00-26.00% of Cr, 0.20-0.60% of Nb+Ta, 0.15-0.35% of N and the balance Fe and inevitable trace elements. The preparation method of the invention adopts hot extrusion and cold rolling, computer automatic control solution heat treatment and other advanced technologies. Theproduct of the invention has excellent mechanical performance, high temperature resistant and corrosion resistance and various technical indexes of the product all meet or exceed Chinese relevant technical standards, thus successfully providing a new kind of qualified tube for the ultra supercritical power station boiler.

Description

technical field [0001] The invention relates to an alloy steel pipe and a production method thereof. Background technique [0002] The tube for ultra-supercritical power plant boiler is a high-performance alloy steel tube. It must have high-temperature mechanical properties, high-temperature durable strength, high-temperature flue gas corrosion resistance, high-temperature steam-water medium corrosion resistance, and good welding and processing technology. performance. At present, my country is still unable to produce such high-performance boiler tubes, and can only rely on imports. Imported tubes are not only expensive, but also insufficient in resources, and the supply is not timely, which seriously restricts the production and development of my country's ultra-supercritical power plant boilers. . Contents of the invention [0003] The object of the present invention is to provide a stainless heat-resistant alloy steel seamless steel pipe which is especially suitable fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/48C22C30/00C21C5/52C21C7/00C21D8/10B21C37/04
CPCY02P10/20
Inventor 蒋淮海陈培良苏诚王长城丁文炎
Owner ZHEJIANG JIULI HI TECH METALS
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