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Manufacturing method of ferritic stainless steel seamless pipe with small diameter

A manufacturing method and ferritic technology are applied in the manufacture of small-diameter ferritic stainless steel seamless pipes and the manufacturing field of ferritic stainless steel pipes, which can solve the problems of low yield of deep processing and inability to solve cracks on the inner and outer surfaces of steel pipes, etc. Achieve significant technological progress, avoid intergranular corrosion problems, and reduce production costs

Inactive Publication Date: 2006-01-18
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

Method used

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  • Manufacturing method of ferritic stainless steel seamless pipe with small diameter
  • Manufacturing method of ferritic stainless steel seamless pipe with small diameter
  • Manufacturing method of ferritic stainless steel seamless pipe with small diameter

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Embodiment Construction

[0060] 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.

[0061] 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.

[0062] A method for manufacturing a small-diameter ferritic stainless steel seamless pipe, which includes the following steps:

[0063] 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 ...

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Abstract

This invention relates to a process method to make stainless steel tube without gap, which comprises the following steps: providing the required steel ingot; forging; heating tube blank; drilling and rolling; processing the rolling, empty sinking, cold-drawing; again empty sinking, final product annealing and final product making.

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 Applications(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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