Cold working process for high Cr ferrite stainless steel seamless pipe

A high-chromium ferrite and stainless steel technology, which is used in the manufacture of ferritic stainless steel pipes and the cold working field of ferritic stainless steel seamless pipes, can solve the problems of low yield of deep processing and inability to solve the cracks on the inner and outer surfaces of steel pipes, etc. Significant technological progress, avoidance of intergranular corrosion problems, effect of significant economic significance

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

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  • Cold working process for high Cr ferrite stainless steel seamless pipe
  • Cold working process for high Cr ferrite stainless steel seamless pipe
  • Cold working process for high Cr ferrite stainless steel seamless pipe

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Embodiment Construction

[0038] 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.

[0039] 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.

[0040] First, provide eligible steel ingots, where,

[0041] The chemical composition of the steel ingot meets: carbon C≤0.12%; silicon Si<1.0%; manganese Mn≤0.8%; sulfur S≤0.03%; phosphorus P<0.0035%; Fe, 5c is 5 times the carbon content, and the chromium Cr content is controlled in the r...

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Abstract

Cold preparation technique for high chromium ferritic stainless steel seamless tube. Wherein, roll the hot-rolled formed pipe repeatedly and control the deformation value into predetermined value; take anneal for former rolling product, take out and cool with water, straighten, cut off, decrease wall, and control the deformation value into predetermined value; take empty sinking time after time to control deformation; take anneal and air cooling for finished product in vacuum. This invention solves effectively brittleness problem for ferritic stainless steel, decreases even avoids the cement out of carbide and nitride; prevents hypersensitization effectively, avoids intergranular corrosion; and the combination of cold drawing and cold rolling solves the problem that it is easy to appear flaw for ferritic stainless steel seamless tube.

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 cold working of 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 cold work, especiall...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P13/00
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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