Title:
HIGHLY CORROSION-RESISTANT STAINLESS STEEL MEMBER AND METHOD FOR MANUFACTURING SAME, HEAT TREATMENT METHOD FOR STAINLESS STEEL MEMBER, AND ROLLING BEARING AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2022/064643
Kind Code:
A1
Abstract:
Provided is a highly corrosion-resistant stainless steel member which is made from a martensitic stainless steel, does not contain ferrite in a surface layer part thereof, and has both of high corrosion resistance and high hardness. The highly-corrosion-resistant stainless steel member comprises a martensitic stainless steel containing 0.35 to 0.43% of C, 0.5% or less of Si, 0.5% or less of Mn, 0.04% or less of P, 0.04% or less of S, 15 to 17% of Cr, 0.1 to 0.3% of W, 1.5 to 3.0% of Mo, 0.001 to 0.005% of B and 0.12 to 0.18% of N in terms of weight ratio, with the remainder comprising Fe and unavoidable impurities, in which a base structure of a surface layer part in the whole outer surface is a dual-phase mixed structure comprising retained austenite and martensite, and the hardness of the surface is HRC57 or more.
Inventors:
TANEDA SYOTA (JP)
MAENO KEIKI (JP)
MAENO KEIKI (JP)
Application Number:
PCT/JP2020/036329
Publication Date:
March 31, 2022
Filing Date:
September 25, 2020
Export Citation:
Assignee:
MINEBEA MITSUMI INC (JP)
International Classes:
C21D9/40; C21D6/00; C22C38/00; C22C38/32; F16C33/62; F16C33/64
Domestic Patent References:
| WO2018008674A1 | 2018-01-11 | |||
| WO2017141928A1 | 2017-08-24 |
Foreign References:
| JP2010077525A | 2010-04-08 | |||
| JP2000345304A | 2000-12-12 | |||
| JPH1036945A | 1998-02-10 | |||
| JP2010265487A | 2010-11-25 | |||
| JP2020180313A | 2020-11-05 |
Attorney, Agent or Firm:
SUENARI, Mikio (JP)
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