PRECIPITATION HARDENING-TYPE MARTENSITE-BASED STAINLESS STEEL AND UNDERGROUND EXCAVATION DRILL COMPONENT

Title:

PRECIPITATION HARDENING-TYPE MARTENSITE-BASED STAINLESS STEEL AND UNDERGROUND EXCAVATION DRILL COMPONENT

Document Type and Number:

WIPO Patent Application WO/2020/054540

Kind Code:

A1

Abstract:

This precipitation hardening-type martensite-based stainless steel and this underground excavation drill using the same, contain C<0.10 mass%, 0.01≤Si≤0.10 mass%, 0.01≤Mn≤0.10 mass%, P≤0.010 mass%, S≤0.010 mass%, 10.0≤Ni≤16.0 mass%, 8.0≤Cr≤10.9 mass%, 1.0≤Mo≤2.5 mass%, 0.001≤N≤0.010 mass%, 0.40≤Al≤1.40 mass%, Cu<0.10 mass%, 0.30≤Ti≤1.40 mass%, and 0≤Nb≤0.50 mass%, the remaining portion being Fe and unavoidable impurities, wherein 1.00 ≤ [Al]+[Ti]+[Nb] ≤ 2.00, 5.50 ≤ [Ni]/([Al]+[Ti]+[Nb]) ≤ 12.00, 10.00≤Nieq≤17.00, and 12.00≤Creq≤17.00 are satisfied.

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Inventors:

OKAMOTO AKIHIKO (JP)
TAKABAYASHI HIROYUKI (JP)
TAKAHASHI NOBUYUKI (JP)

Application Number:

PCT/JP2019/034788

Publication Date:

March 19, 2020

Filing Date:

September 04, 2019

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Assignee:

DAIDO STEEL CO LTD (JP)

International Classes:

C22C38/00; C22C38/50; C21D6/00; C21D8/00

Domestic Patent References:

WO2012002208A1

2012-01-05

Foreign References:

JP2013147698A	2013-08-01
JP2013209742A	2013-10-10
JP2018524473A	2018-08-30
CN101050509A	2007-10-10

Attorney, Agent or Firm:

KOH-EI PATENT FIRM, P.C. (JP)

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