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Method for making ferrite stainless steel seamless pipes and cold working process thereof

A manufacturing method, a stainless steel technology, is applied in the manufacture of ferritic stainless steel pipes and small-diameter ferritic stainless steel seamless pipes. The effect of technological progress, avoiding intergranular corrosion problems, and reducing production costs

Inactive Publication Date: 2006-06-14
天津冶金集团天材科技发展有限公司
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Problems solved by technology

[0004] The known technology has no good solution for the manufacture of ferritic stainless steel seamless steel pipes, especially for the production and manufacture of high chromium ferritic stainless steel small diameter seamless steel pipes, which cannot solve the problems of cracks on the inner and outer surfaces of the steel pipes, and the problem that the yield of deep processing is quite low

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  • Method for making ferrite stainless steel seamless pipes and cold working process thereof
  • Method for making ferrite stainless steel seamless pipes and cold working process thereof
  • Method for making ferrite stainless steel seamless pipes and cold working process thereof

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Embodiment Construction

[0085] Below in conjunction with preferred embodiments, the specific implementation, features and effects provided by the present invention are described in detail as follows; for the purpose of simplicity and clarity, the description of known technologies is appropriately omitted below to avoid unnecessary details Affect the description of this technical solution.

[0086] Manufacture an AISI446 ferritic stainless steel seamless pipe, the specification is Φ6.3×0.3mm, the outer diameter is ±0.1mm, the wall thickness is 0.3-0.35mm, and the length is 58.5±0.1mm; performance requirements: HV<200 during deep processing Cracks are not allowed, and the extension after processing is consistent.

[0087] A method for manufacturing a ferritic stainless steel seamless pipe, comprising the following steps:

[0088] I. The smelting process adopts a vacuum induction furnace with a vacuum degree of 10 -3 Torr, steel ingots can be smelted, and can also be smelted by VOD method;

[0089] T...

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Abstract

A method for manufacturing a ferritic stainless steel seamless pipe, comprising: smelting a steel ingot with uniform grain size, no cracks, and no scars, and meeting the set process conditions; the forging compression ratio is 8-12; the initial forging process The forging temperature is 1050°C-1120°C, and the final forging temperature is 800°C-850°C; the forged bar is processed into a tube blank and then heated; piercing and hot rolling; Pulling and reducing the wall, then empty drawing, and annealing the finished product to make a ferritic stainless steel seamless pipe. The invention can greatly improve the finished product rate of the ferritic stainless steel seamless pipe, reduce the production cost, have significant technical progress compared with the prior art, have important economic significance, and be easy to promote and apply in industry.

Description

technical field [0001] The invention belongs to the field of metal processing, in particular to the manufacture of ferritic stainless steel pipes, and is especially suitable for the manufacture of small-diameter ferritic stainless steel seamless pipes. Background technique [0002] Ferritic stainless steel refers to stainless steel with a chromium content of 11%-30%, a body-centered cubic crystal structure, and a ferrite structure in use. In addition to its stainless and general corrosion resistance, ferritic stainless steel has better local corrosion resistance such as chloride stress corrosion resistance, pitting corrosion resistance and crevice corrosion resistance. Its ferritic stainless steel has high strength, The thermal expansion coefficient is low, and it is also known as nickel-saving stainless steel. Although it has many advantages, it is not widely used. The reason is that ferritic stainless steel has poor plasticity and is difficult to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L9/02C22C38/28B21J5/00B21B23/00
Inventor 于庆莲
Owner 天津冶金集团天材科技发展有限公司
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