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Ferritic stainless steel sheet and method for producing same

A technology of stainless steel plate and manufacturing method, which is applied to manufacturing tools, furnaces, heat treatment equipment, etc., can solve problems such as cracks and cracks in steel plates, and achieve the effect of excellent hydrogen embrittlement resistance and excellent corrosion resistance.

Active Publication Date: 2021-11-05
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] If hydrogen embrittlement occurs, not only cracks are likely to occur during the processing of the steel plate, but also in the steel plate that has been processed into a processed part, cracks may occur in the portion where the residual stress occurs, and these phenomena become a problem.

Method used

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  • Ferritic stainless steel sheet and method for producing same
  • Ferritic stainless steel sheet and method for producing same
  • Ferritic stainless steel sheet and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0167] Ferritic stainless steel having the composition shown in Table 1-1 was melted into a 100 kg steel ingot, heated at a temperature of 1150° C. for 1 hour, and hot rolled so that the plate thickness became 3.0 mm. The hot-rolled sheet is air-cooled immediately after the final pass of hot-rolling.

[0168] [Table 1-1]

[0169]

[0170] The obtained hot-rolled sheet was kept at the annealing temperature of each hot-rolled sheet recorded in Table 1-2 for the annealing time of each hot-rolled sheet described in Table 1-2, and then air-cooled to produce a hot-rolled annealed sheet.

[0171] The hot-rolled annealed sheet is first pickled in a sulfuric acid solution and then in a mixed solution of hydrofluoric acid and nitric acid to produce a raw material for cold rolling, and then cold-rolled to a thickness of 1.0 mm to obtain a cold-rolled sheet. plate.

[0172] After keeping the cold-rolled sheet annealing temperature recorded in Table 1-2 for the annealing time of each co...

Embodiment 2

[0205] After melting the ferritic stainless steel having the composition shown in Table 2 into a 100 kg ingot, it was heated at a temperature of 1150° C. for 1 hour, and hot rolled so that the sheet thickness would be 3.0 mm. The hot-rolled sheet is air-cooled immediately after the final pass of hot-rolling.

[0206] The obtained hot-rolled sheet was held at 940° C. for 10 seconds, and then air-cooled to obtain a hot-rolled annealed sheet.

[0207] The hot-rolled annealed sheet was pickled first in a sulfuric acid solution and then in a mixed solution of hydrofluoric acid and nitric acid to prepare a raw material for cold rolling, and then cold-rolled to a thickness of 1.0 mm to obtain a cold-rolled sheet.

[0208] After holding the obtained cold-rolled sheet at 1040° C. for 45 seconds, it was air-cooled, and then the surface was ground to remove the surface scale layer to obtain a cold-rolled annealed sheet.

[0209] The above-mentioned evaluations were performed on the obta...

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Abstract

Provided is a ferritic stainless steel sheet which does not require a dehydrogenation treatment for the production thereof and has excellent corrosion resistance and hydrogen embrittlement resistance properties in spite of the fact that Ni, Cu and Mn are not contained in larger amounts. The ferritic stainless steel sheet has a component composition comprising, in % by mass, 0.001 to 0.020% of C, 0.10 to 0.60% of Si, 0.10 to 0.60% of Mn, 0.040% or less of P, 0.030% or less of S, 0.030 to 0.060% of Al, 16.5 to 19.0% of Cr, 0.15 to 0.35% of Ti, 0.30 to 0.60% of Nb, 0.01 to 0.60% of Ni, 0.0025 to 0.0050% of O (oxygen), 0.001 to 0.020% of N and a remainder made up by Fe and unavoidable impurities, and is so configured that the number of precipitates each having a cross-sectional area of 5.0 [mu]m2 or more in a 1-mm2 zone is 300 or less and the average cross-sectional area of precipitates each having a cross-sectional area of 5.0 [mu]m2 or more is 20.0 [mu]m2 or less.

Description

technical field [0001] The ferritic stainless steel plate of the present invention is used in an environment where hydrogen penetrates into the steel, and has excellent corrosion resistance and excellent hydrogen embrittlement resistance. Background technique [0002] Stainless steel forms a dense and chemically stable passivation film on the steel surface by containing Cr in the steel, and is excellent in corrosion resistance. Among stainless steels, ferritic stainless steel is cheaper than austenitic stainless steel because it does not contain a lot of expensive elements, has a small coefficient of thermal expansion, and has characteristics such as magnetism. It is used in various applications including cooking utensils. [0003] On the other hand, general-purpose ferritic stainless steels have significantly deteriorated corrosion resistance at welded portions when welded. Significant deterioration of corrosion resistance at the welded portion causes a so-called sensitiza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/50C22C38/52C22C38/60
CPCC22C38/00C21D9/46C22C38/60C22C38/50C22C38/52C21D8/0273C22C38/001C22C38/002C22C38/48C22C38/06C21D8/0236C21D8/0226C22C38/02C22C38/04C22C38/44C22C38/46C21D2211/005
Inventor 西田修司吉野正崇高法刚山口广史
Owner JFE STEEL CORP
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