Title:
溶接構造物用のTiN+MnSを析出させている鋼板、及びそれを製造するための方法、並びにそれを用いる溶接構造物
Document Type and Number:
Japanese Patent JP3895686
Kind Code:
B2
Abstract:
A weldable structural steel product having fine complex precipitates of TiN and MnS is provided which contains, in terms of percent by weight, 0.03 to 0.17% C, 0.01 to 0.05% Si, 1.0 to 2.5% Mn, 0.05 to 0.2% Ti, 0.0005 to 0.1% Al, 0.008 to 0.030% N, 0.0003 to 0.01% B, 0.001 to 0.2% W, at most 0.03% P, 0.003 to 0.05% S, at most 0.005% O, and balance Fe and incidental impurities while satisfying conditions of 1.2<=Ti/N<=2.5, 10<=N/B<=40, 2.5<=Al/N<=7, 6.5<=(Ti+2Al+4B)/N<=14, and 220<=Mn/S<=400. The steel has a microstructure consisting essentially of a complex structure of ferrite and pearlite having a grain size of 20 mum or less.
Inventors:
Jeon Hong Churu
Choi Hae Chan
Cho Eun Young
Choi Hae Chan
Cho Eun Young
Application Number:
JP2002546782A
Publication Date:
March 22, 2007
Filing Date:
November 20, 2001
Export Citation:
Assignee:
POSCO
International Classes:
B22D11/00; C22C38/00; B22D11/124; B22D11/20; B22D11/22; C21C7/06; C21D8/02; C22C38/04; C22C38/06; C22C38/12; C22C38/14; C22C38/60
Domestic Patent References:
| JP3264614A | ||||
| JP50033920A | ||||
| JP59185760A | ||||
| JP61117213A | ||||
| JP11229077A |
Attorney, Agent or Firm:
Mikio Yoshimiya
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