Title:
STEEL MATERIAL
Document Type and Number:
WIPO Patent Application WO/2023/048248
Kind Code:
A1
Abstract:
Provided is a steel material which has exceptional machinability, in which cracking during hot working and melt cracking during induction hardening can be suppressed, and which has exceptional fatigue strength when used as a component for a machine structure. This steel material contains, in terms of mass%, 0.05-0.30% of C, 0.05-0.45% of Si, 0.30-2.00% of Mn, no more than 0.030% of P, 0.010-0.095% of S, 0.01-2.00% of Cr, 0.0051-0.1500% of Bi, and 0.0030-0.0250% of N, and satisfies expression (1). In the steel material, the number density of fine Bi particles is 80-8,000/mm2, and the number density of coarse Bi particles is 10/mm2 or less. [Expression 1]: 0.25≤C+(Si/10)+(Mn/5)−(5S/7)+(5Cr/22)+1.65V≤1.00
Inventors:
MIYANISHI KEI (JP)
AISO TOSHIHARU (JP)
AISO TOSHIHARU (JP)
Application Number:
PCT/JP2022/035434
Publication Date:
March 30, 2023
Filing Date:
September 22, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21C7/04; C21D8/06; C21D9/30; C22C38/00; C22C38/60
Foreign References:
| JP2004018879A | 2004-01-22 | |||
| JP2000265243A | 2000-09-26 | |||
| US4255188A | 1981-03-10 | |||
| JP2021155808A | 2021-10-07 |
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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