Title:
MARTENSITIC FREE-CUTTING STAINLESS STEEL BAR MATERIAL AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2024/070413
Kind Code:
A1
Abstract:
Provided is a martensitic free-cutting stainless steel bar material characterized by having chemical components including 0.10-0.60% of C, 0.1-2.0% of Si, 0.1-3.0% of Mn, 0.15-0.40% of S, 0.10% or less of P, and 11.0-16.0% of Cr, the balance being Fe and impurities, as well as by having an average Cr carbide circle equivalent diameter of 0.80 μm or less, and having a Cr carbide number density of 0.10/μm2 or greater. More preferably, the average sulfide circle equivalent diameter is 5.0 μm or less, and the sulfide number density is 0.010/μm2 or greater. This makes it possible to obtain exceptional tool service life during precision cutting and to obtain cut surface quality having exceptional flatness achieved by cutting.
Inventors:
OKA YOSHIHIRO (JP)
TAKANO KOHJI (JP)
TENDO MASAYUKI (JP)
AISO TOSHIHARU (JP)
TAKANO KOHJI (JP)
TENDO MASAYUKI (JP)
AISO TOSHIHARU (JP)
Application Number:
PCT/JP2023/031185
Publication Date:
April 04, 2024
Filing Date:
August 29, 2023
Export Citation:
Assignee:
NIPPON STEEL STAINLESS STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/06; C21D9/00; C22C38/60
Domestic Patent References:
| WO2019240209A1 | 2019-12-19 |
Foreign References:
| JP2015137381A | 2015-07-30 | |||
| JP2004197198A | 2004-07-15 | |||
| CN106591730A | 2017-04-26 |
Attorney, Agent or Firm:
KINOSHITA & ASSOCIATES (JP)
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