Title:
窒化用鋼材
Document Type and Number:
Japanese Patent JP5783101
Kind Code:
B2
Abstract:
A steel material for nitriding has a composition comprising, by mass percent, C: more than 0.15% and not more than 0.35%, Si≦0.20%, Mn: 0.10 to 2.0%, P≦0.030%, S≦0.050%, Cr: 0.80 to 2.0%, V: 0.10 to 0.50%, Al: 0.01 to 0.06%, N≦0.0080%, O≦0.0030%, and optionally one or more elements of Mo, Cu, Ni, Ti, Nb, Zr, Pb, Ca, Bi, Te, Se and Sb, the balance being Fe and impurities. The composition satisfies the conditions of [20≦(669.3×logeC−1959.6×logeN−6983.3)×(0.067×Mo+0.147×V)≦80] and [140×Cr+125×Al+235×V≧160]. The microstructure is a ferritic-pearlitic structure, a ferritic-bainitic structure, or a ferritic-pearlitic-bainitic structure. The area fraction of ferrite is 20% or more and the precipitate content of V is 0.10% or less.
Inventors:
Yuya Gyotoku
Masayuki Horimoto
Hideki Imataka
Kosuke Tanaka
Masayuki Horimoto
Hideki Imataka
Kosuke Tanaka
Application Number:
JP2012064740A
Publication Date:
September 24, 2015
Filing Date:
March 22, 2012
Export Citation:
Assignee:
Nippon Steel & Sumitomo Metal Corporation
International Classes:
C22C38/00; C21D1/06; C22C38/60; C23C8/26; C23C8/38; C23C8/50
Domestic Patent References:
| JP59190321A | ||||
| JP6025797A | ||||
| JP9071841A |
Foreign References:
| WO2012053541A1 |
Attorney, Agent or Firm:
Patents corporation Blitas