Title:
STEEL SHEET AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2023/112634
Kind Code:
A1
Abstract:
The purpose of the present invention is to propose: a steel sheet which has excellent joint toughness, excellent base material toughness and high tensile strength even at low temperatures of -60°C or less in a high heat input welding heat-affected zone where the welding heat input is 50 kJ/cm or more; and a method for producing this steel sheet. The present invention provides a steel sheet which contains specific components so as to satisfy formula (1) and formula (2), while containing 0.003% or less of Nb and having a specific structure and specific characteristics. Formula (1): 0 < (Ca - (0.18 + 130 × Ca) × O)/1.25/S < 1
Formula (2): Ceq. ≤ 0.36
Meanwhile, Ceq. = C + Mn/6 + (Cr + Mo + V)/5 + (Cu + Ni)/15.
In formula (1) and formula (2), the atomic symbols represent the contents (mass%) of the respective elements.
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Inventors:
ARAO RYO (JP)
TAKESHITA RYUHEI (JP)
TACHIBANA SHUNICHI (JP)
HIRAIDE TAKASHI (JP)
TAKESHITA RYUHEI (JP)
TACHIBANA SHUNICHI (JP)
HIRAIDE TAKASHI (JP)
Application Number:
PCT/JP2022/043459
Publication Date:
June 22, 2023
Filing Date:
November 25, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C22C38/14; C22C38/58
Domestic Patent References:
| WO2017135179A1 | 2017-08-10 | |||
| WO2014141632A1 | 2014-09-18 | |||
| WO2021182618A1 | 2021-09-16 | |||
| WO2018138887A1 | 2018-08-02 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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