Title:
STEEL MATERIAL
Document Type and Number:
WIPO Patent Application WO/2021/171494
Kind Code:
A1
Abstract:
Provided is a steel material having an excellent limit processing rate and excellent chip treatability. A steel material according to the present embodiment has a chemical composition containing, in terms of mass%, 0.11-0.15% of C, 0.17-0.35% of Si, 0.45-0.80% of Mn, 0.005-0.050% of S, 1.50-1.90 (exclusive of 1.90) of Cr, 0.0005-0.0100% of B, 0.010-0.050% (exclusive of 0.050) of Ti, 0.010-0.100% of Al, 0.0002-0.0030% of Ca, at most 0.0080% of N, at most 0.050% of P, and at most 0.0030% of O, with the remainder consisting of Fe and impurities. This steel material satisfies formulae (1)-(4) described in the specification, and has a microstructure in which the total area ratio of ferrite and pearlite is at least 85.0% and the total area ratio of pearlite grains having an area of at least 200 μm2 is 20.0-35.0% (exclusive of 35.0).
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Inventors:
SHIGA AKIRA (JP)
NEISHI YUTAKA (JP)
NEISHI YUTAKA (JP)
Application Number:
PCT/JP2020/008071
Publication Date:
September 02, 2021
Filing Date:
February 27, 2020
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C21D1/06; C22C38/60
Domestic Patent References:
| WO2012108460A1 | 2012-08-16 | |||
| WO2019198415A1 | 2019-10-17 |
Foreign References:
| JP2019218586A | 2019-12-26 | |||
| JP2017193767A | 2017-10-26 | |||
| JP2004332078A | 2004-11-25 |
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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