Title:
STEEL FOR MACHINE STRUCTURAL USE, EXCELLENT IN MACHINABILITY AND GRAIN COARSENING RESISTANCE
Document Type and Number:
Japanese Patent JP3534166
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a steel for machine structural use, excellent in machinability, capable of inhibiting the coarsening of austenite grains even if high-temp., short-time treatment is performed at the time of surface hardening treatment such as carburizing, and increased in resistance to case crush.
SOLUTION: The steel has a composition consisting of, by weight, >0.3-0.5% C, <1.0% Si, ≤2.0% Mn, ≤0.03% P, 0.02-0.15% S, ≤2.0% Cr, ≤0.4% Ti, ≤0.4% Zr, ≤0.008% N, ≤3.5% Ni, ≤1.0% Mo, ≤1.0% W, ≤0.005% B, ≤0.1% Nb, ≤0.3% V, ≤0.3% Pb, ≤0.1% Ca, ≤0.1% Al, and the balance Fe with impurities and satisfying Ti(%)+Zr(%)=0.025 to 0.4%.
Inventors:
Murai, Nobuhiro
Watari, Koji
Watari, Koji
Application Number:
JP12858998A
Publication Date:
June 07, 2004
Filing Date:
May 12, 1998
Export Citation:
Assignee:
SUMITOMO METAL IND LTD
International Classes:
C22C38/00; C22C38/60; (IPC1-7): C22C38/00; C22C38/60
Other References:
「材料とプロセス」Ｖｏｌ．７（１９９４）Ｎｏ．３、Ｐ８１９
「材料とプロセス」Ｖｏｌ．７（１９９４）Ｎｏ．６、Ｐ１８３９
「材料とプロセス」Ｖｏｌ．９（１９９６）Ｎｏ．３、Ｐ３７８
「材料とプロセス」Ｖｏｌ．７（１９９４）Ｎｏ．６、Ｐ１８３９
「材料とプロセス」Ｖｏｌ．９（１９９６）Ｎｏ．３、Ｐ３７８
Attorney, Agent or Firm:
杉岡 幹二 （外２名）
Previous Patent: TONER SUPPLY DEVICE AND IMAGE FORMING DEVICE THEREWITH
Next Patent: METHOD AND CIRCUIT FOR DRIVING INJECTOR
Next Patent: METHOD AND CIRCUIT FOR DRIVING INJECTOR