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Martensitic stainless steel sheet

A stainless steel plate and system technology, applied in furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problem of high susceptibility to stress corrosion cracking of stainless steel, and achieve the goal of improving ultimate deformation capacity, excellent corrosion resistance, excellent strength and processability Effect

Active Publication Date: 2018-11-09
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, austenitic stainless steel contains a large amount of Ni, which is an expensive element, and there is a big problem in terms of material cost
In addition, austenitic stainless steel has the problem of high susceptibility to stress corrosion cracking

Method used

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  • Martensitic stainless steel sheet
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0119] A 30 kg steel billet having the composition shown in Table 1 was melted and cast in a vacuum melting furnace. After being heated to 1200°C, hot rolling was performed to produce a thin slab of 25 mm in thickness and 150 mm in width. The thin slab was kept in a 700°C furnace for 10 hours and softened. Next, the thin slab was heated to 1100°C and then hot rolled to produce a hot rolled sheet having a thickness of 4 mm. Next, the hot-rolled sheet was kept in a furnace at 700° C. for 10 hours and annealed to produce a hot-rolled annealed sheet. Next, the hot-rolled annealed sheet was made into a cold-rolled sheet having a thickness of 0.2 mm by cold rolling, and was quenched and heat-treated at the temperature shown in Table 2 and then cooled. In addition, the cooling rate at this time is all set to 1 degreeC / sec or more. Furthermore, some cold-rolled sheets were subjected to tempering heat treatment at the temperature shown in Table 2 after cooling after the quenching hea...

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Abstract

A martensitic stainless steel sheet has a component composition containing, in mass%, C: 0.030% to less than 0.20%, Si: 0.01% to 2.0%, Mn: 0.01% to 3.0%, P: 0.050% or less, S: 0.010% or less, Cr: 10.0% to 16.0%, Ni: 0.01% to 0.80%, Al: 0.001% to 0.50%, Zr: 0.005% to 0.50% and N: 0.030% to less than 0.20%, the balance being made of Fe and unavoidable impurities.

Description

Technical field [0001] The present invention relates to a martensitic stainless steel plate that is excellent in strength and workability and also excellent in corrosion resistance. Background technique [0002] For the purpose of preventing leakage of exhaust gas, cooling water, lubricating oil, etc., a sealing member called a gasket seals between the components of the exhaust system of the automobile. As for the gasket, the sealing performance must be exerted in any case where the gap is enlarged or reduced due to pressure fluctuations in the pipe, and therefore, a convex part called a bead is processed. Reinforcing ribs require high strength due to repeated compression and relaxation during use. In addition, depending on the shape of the ribs, severe processing is sometimes required. Therefore, the gasket material is also required to have excellent workability. In addition, since the gasket is exposed to exhaust gas, cooling water, etc. during use, it is also required to hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/58C21D9/46
CPCC22C38/00C22C38/58C21D6/004C21D8/0226C21D8/0236C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/54C21D9/46C21D8/0205C21D2211/008C22C38/34C21D6/005C21D6/007C21D6/008
Inventor 中村彻之石川伸上力
Owner JFE STEEL CORP
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