Title:
WEATHERPROOF STEEL AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3348592
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a weatherproof steel capable of forming a dense weatherproof rust in an early stage even in a coastal area and its production.
SOLUTION: This weatherproof steel is a steel having a composition consisting of, by weight, 0.01-0.3% C, 0.05-0.5% Si, 0.3-2% Mn, 0.005-0.1% sol.Al, 0-1.5% Cr, 0-0.6% Mo, 0-0.5% Ni, 0-1% Cu, 0-0.1% Nb, 0-0.1% Ti, 0-0.1% V, and the balance Fe with inevitable impurities and also having a structure composed of mixed phases of two or more phases, and further, the difference of average hardness between hard phases and soft phases is 80-200 Vickers hardness and the average spacing between mutual hard phases is ≤50μm. This process of producing the weatherproof steel comprises hardening treatment from a two phase state of ferrite and austenite.
Inventors:
Masato Yamashita
Yuki Hideaki
Yuki Hideaki
Application Number:
JP11743896A
Publication Date:
November 20, 2002
Filing Date:
May 13, 1996
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
C21D6/00; C22C38/00; C22C38/58; (IPC1-7): C22C38/00; C21D6/00; C22C38/58
Domestic Patent References:
| JP4929215A |
Attorney, Agent or Firm:
Morio Mori (1 outside)
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