Ferrite stainless steel and manufacturing method of ferrite stainless steel cold-rolled sheet made therefrom

Abstract

The invention provides ferrite stainless steel which comprises the following chemical components by weight percent: 0.008-0.020% of C, 0.80-1.20% of Si, 0.70-1.20% of Mn, less than or equal to 0.70% of Mo, 13.0-16.0% of Cr, less than or equal to 0.03% of P, less than or equal to 0.003% of S, [4*(C+N)+0.30]-0.60% of Nb, [6*(C+N)]-0.2% of Ti, 0.005-0.05% of Al, [0.15+10*(C+N)]-0.2% of Ti, 0.005-0.05% of Al, more than or equal to [0.15+10*(C+N)]% and less than or equal to 0.50% of [Ti+0.5Nb], less than or equal to 0.015% of N, less than or equal to 0.030% of C+N, less than or equal to 0.3% of Ni, less than or equal to 0.3% of Cu and the balance of Fe and inevitable impurities, wherein the total amount of impurities is less than 0.05%. The ferrite stainless steel cold-rolled sheet made from the steel has the advantage of good high-temperature property, and is extremely suitable for being used in a manifold component of an automobile exhaust system.

Description

technical field [0001] The present invention relates to ferritic stainless steel, in particular to the composition of steel grades capable of producing ferritic stainless steel cold-rolled sheets with good high-temperature strength, the cold-rolled sheets produced therefrom, and the manufacturing method thereof. This ferritic stainless steel cold-rolled sheet The board has excellent high-temperature performance and is suitable for making high-temperature end parts in automobile exhaust systems. Background technique [0002] With the development of the automobile industry and the continuous improvement of automobile exhaust emission requirements, the use of ferritic stainless steel with good high-temperature performance to make automobile exhaust system manifolds has attracted more and more attention from automobile manufacturers. Compared with the cast manifold, the stainless steel welded manifold can increase the temperature of the catalyst generator in the exhaust system i...

AI Technical Summary

Problems solved by technology

[0013] The Chinese patent application with the publication number CN1982492A adopts Nb monostabilization. By adding high Si content and compounding Mo and W to improve the high-temperature strength and high-temperature oxidation resistance of the material, the Mo content is 1.0-5.0%, and the cost of raw materials is very high.

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