Title:
STEEL MATERIAL
Document Type and Number:
WIPO Patent Application WO/2022/201381
Kind Code:
A1
Abstract:
Provided is a steel material with which it is possible to inhibit roughening of the surface after a shaving process. The steel material according to the present embodiment has a chemical composition containing, by mass, 0.50 to 0.80% of C, 1.20 to 2.90% of Si, 0.25 to 1.00% of Mn, 0.40 to 1.90% of Cr, 0.05 to 0.60% of V, 0.020% or less of P, 0.020% or less of S, 0.0100% or less of N, 0 to 0.50% of Mo, 0 to 0.050% of Nb, 0 to 0.60% of W, 0 to 0.50% of Ni, 0 to 0.30% of Co, 0 to 0.0050% of B, 0 to 0.050% of Cu, 0 to 0.0050% of Al, and 0 to 0.050% of Ti, with the remainder made up by Fe and unavoidable impurities. In the microstructure of the steel material, the pearlite area ratio is 90% or above, and in ferrite in the pearlite, the number density of V-based precipitates having a maximum diameter of 2 to 20 nm is 3000 to 80,000 /μm3.
Inventors:
TERAMOTO SHINYA (JP)
CHIBA KEISUKE (JP)
NEISHI YUTAKA (JP)
CHIBA KEISUKE (JP)
NEISHI YUTAKA (JP)
Application Number:
PCT/JP2021/012350
Publication Date:
September 29, 2022
Filing Date:
March 24, 2021
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C22C38/24; C22C38/54; C21D8/06; C21D9/52
Foreign References:
| JP2002180199A | 2002-06-26 | |||
| JP2014208900A | 2014-11-06 | |||
| JP2002180200A | 2002-06-26 | |||
| JP2017179524A | 2017-10-05 | |||
| KR20180073389A | 2018-07-02 |
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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