Title:
熱処理鋼板部材およびその製造方法
Document Type and Number:
Japanese Patent JP6380660
Kind Code:
B2
Abstract:
A heat-treated steel sheet member having a chemical composition including, by mass%: C: 0.05 to 0.50%; Si: 0.50 to 5.0%; Mn: 1.5 to 4.0%; P: 0.05% or less; S: 0.05% or less; N: 0.01% or less; Ti: 0.01 to 0.10%; B: 0.0005 to 0.010%; Cr: 0 to 1.0%; Ni: 0 to 2.0%; Cu: 0 to 1.0%; Mo: 0 to 1.0%; V: 0 to 1.0%; Ca: 0 to 0.01%; Al: 0 to 1.0%; Nb: 0 to 1.0%; REM: 0 to 0.1%; and the balance: Fe and impurities, wherein the steel sheet member has a steel micro-structure comprising: mainly martensite; and retained austenite of which a volume ratio is 0.2 to 1.0%, a number density of retained carbide being present in the steel sheet member and having circle-equivalent diameters of 0.1 µm or larger is 4.0 × 10 3 /mm 2 or lower, a tensile strength is 1.4 GPa or higher, and a yield ratio is 0.65 or higher.
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Inventors:
Yoshihiro Suwa
Shinichiro Tabata
Masashi Higashi
Kazuo Oda
Shinichiro Tabata
Masashi Higashi
Kazuo Oda
Application Number:
JP2017511058A
Publication Date:
August 29, 2018
Filing Date:
April 07, 2016
Export Citation:
Assignee:
Nippon Steel & Sumitomo Metal Corporation
International Classes:
B21B1/26; C22C38/00; C21D1/18; C21D9/00; C21D9/46; C22C38/60
Domestic Patent References:
| JP2008240046A | ||||
| JP2011195958A | ||||
| JP2008261032A | ||||
| JP2004353026A | ||||
| JP2014122398A |
Foreign References:
| WO2016158961A1 | ||||
| WO2011158818A1 |
Attorney, Agent or Firm:
Patents corporation Blitas