Title:
高強度鋼板及びその製造方法
Document Type and Number:
Japanese Patent JP7136336
Kind Code:
B2
Abstract:
A high-strength steel sheet includes a predetermined chemical composition, a microstructure contains, by volume percentage, 80% or more of tempered martensite, and a remainder consists of ferrite and bainite, the microstructure contains 5.0 × 1011 pieces/mm3 or more of, per unit volume, precipitate containing Ti and having an equivalent circle diameter of 5.0 nm or less, Hvs/Hvc which is a ratio of an average hardness Hvs at a position of a depth of 20 µm from a surface to an average hardness Hvc at a position of 0.20 to 0.50 mm from the surface is 0.85 or more, and the tensile strength is 1,180 MPa or more.
Inventors:
Masashi Higashi
Eisaku Sakurada
Genki Akikawa
Kenichiro Otsuka
Takeshi Toyota
Eisaku Sakurada
Genki Akikawa
Kenichiro Otsuka
Takeshi Toyota
Application Number:
JP2021509340A
Publication Date:
September 13, 2022
Filing Date:
March 19, 2020
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C22C38/00; C21D9/46; C22C38/58
Domestic Patent References:
| JP2015147958A | ||||
| JP2001220642A |
Foreign References:
| WO2018026013A1 | ||||
| WO2010137317A1 |
Attorney, Agent or Firm:
Sumio Tanai
Mitsuo Teramoto
Tomomasa Katsumata
Hiroshi Yamaguchi
Mitsuo Teramoto
Tomomasa Katsumata
Hiroshi Yamaguchi
Previous Patent: High-strength steel plate and its manufacturing method
Next Patent: LIFTING/POLISHING DEVICE FOR PACHINKO BALL
Next Patent: LIFTING/POLISHING DEVICE FOR PACHINKO BALL