Title:
HEAT RESISTANT LOW ALLOY FERRITIC STEEL
Document Type and Number:
Japanese Patent JP3733902
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide heat resistant low alloy ferritic steel which has reduced in creep strength reduction in a weld-heat affected zone.
SOLUTION: The heat resistant low alloy ferritic steel has a composition comprising, by mass, 0.001 to <0.05% C, ≤1.0% Si, ≤2.0% Mn, ≤0.030% P, ≤0.015% S, 0.2 to <7% Cr, 0.05 to 0.40% V, 0.01 to 0.10% Nb, 0.001 to <0.045% N, ≤0.010% sol.Al, and ≤0.010% O (oxygen), and the balance Fe with impurities, and in which the precipitation density of carbides and carbonitrides having particle diameters of ≥0.3 μm is ≤1×106 pieces/mm2. The steel can contain one or more kinds selected from Mo, W, Cu, Ni, Co, Ta, Hf, Nd, Ti, Ca, Mg, and B.
Inventors:
Hiroshi Hirata
Kazuhiro Ogawa
Kazuhiro Ogawa
Application Number:
JP2001395922A
Publication Date:
January 11, 2006
Filing Date:
December 27, 2001
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
C22C38/00; C22C38/12; C22C38/38; C22C38/58; (IPC1-7): C22C38/00; C22C38/12; C22C38/58
Domestic Patent References:
| JP2001279391A |
Attorney, Agent or Firm:
Mikiji Sugioka
Terutada Hogami
Michio Mori
Terutada Hogami
Michio Mori
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