Title:
低合金鋼
Document Type and Number:
Japanese Patent JP4561834
Kind Code:
B2
Abstract:
A low alloy steel for a heat-resisting structural member being improved in long time creep ductility at high temperatures and temper softening resistance, characterized by comprising, by mass percent, C: 0.03 to 0.10%, Si: not more than 0.30%, Mn: not more than 1.0%, Cr: more than 1.5% to not more than 2.5%, Mo: 0.01 to 1.0%, V: 0.04 to 0.30%, Nb: 0.001 to 0.10%, Ti: 0.001 to 0.020%, B: 0.0001 to 0.020%, Al: 0.001 to 0.01% and Nd: 0.0001 to 0.050%, with the balance being Fe and impurities, wherein the content of P is not more than 0.020%, the content of S is not more than 0.003%, the content of N is less than 0.0050% and the content of O (oxygen) is not more than 0.0050% among the impurities, in which the value of BSO represented by the following formula (1) is 0.0001 to 0.010: BSO = B - ( 11 / 14 ) N - ( 11 / 32 ) S - ( 11 / 16 ) O
wherein each element symbol in the formula (1) represents the content (by mass %) of the element concerned. The steel may further contain one or more element selected from among W, Cu, Ni, Co, Mg, Ca, La, Ce, Y, Sm and Pr.
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Inventors:
Masaaki Igarashi
Kaori Kono
Kaori Kono
Application Number:
JP2007528134A
Publication Date:
October 13, 2010
Filing Date:
April 17, 2006
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
C22C38/00; C22C38/32; C22C38/54
Domestic Patent References:
| JPH05269590A | 1993-10-19 | |||
| JP2004107719A | 2004-04-08 | |||
| JPH09296249A | 1997-11-18 |
Attorney, Agent or Firm:
Mikiji Sugioka
Terutada Hogami
Chihara
Terutada Hogami
Chihara