Title:
鋼材及びその製造方法
Document Type and Number:
Japanese Patent JP7364906
Kind Code:
B2
Abstract:
To provide a steel material that has an excellent toughness in HAZ of large heat input welding with a heat input of 35 kJ/mm or more.MEANS FOR SOLVING THE PROBLEM: A steel material contains C, Si, Mn, is composed of P: 0.030% or less, S: 0.008% or less, Al: 0.010% or less, N: 0.0010 to 0.0080%, O: 0.0005 to 0.0040%, Ti: 0.003 to 0.024%, Zr: 0.0007 to 0.0050%, B: 0.0003 to 0.0040%, total content of Ca, Mg and REM: 0.0005% or less, balance: Fe and impurity elements, Insol. Zr: 0.0007 to 0.0040%, Sol. Zr: 0.0010% or less, BF: 0.0030% or less, and has a predetermined micro structure and aggregate structure, in which (Zr, B)-containing oxide particles having a circle-equivalent diameter of 0.5 μm or more and an Al2O3 composition of 50 mass% or less is 5 to 300 pieces/mm2.SELECTED DRAWING: None
Inventors:
Daiki Imajo
Yoshiaki Shintaku
Keisuke Nakai
Shingo Nakamura
Yoshiaki Shintaku
Keisuke Nakai
Shingo Nakamura
Application Number:
JP2020065648A
Publication Date:
October 19, 2023
Filing Date:
April 01, 2020
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C22C38/00; B21B3/00; B22D1/00; B22D11/00; B22D11/108; B22D11/11; C21C7/10; C21D8/02; C22C38/14; C22C38/58
Domestic Patent References:
| JP2019023324A | ||||
| JP2019035107A |
Foreign References:
| WO2019058424A1 |
Attorney, Agent or Firm:
Sumio Tanai
Mitsuo Teramoto
Tomoo Katsumata
Hiroshi Yamaguchi
Mitsuo Teramoto
Tomoo Katsumata
Hiroshi Yamaguchi