Title:
高周波焼入部品およびその製造方法
Document Type and Number:
Japanese Patent JP3606024
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain machine parts such as gears having characteristics equal to or better than those of carburized particles as for machinability or the like with high productivity by specifying the chemical compsn. of steel and the number and size of oxide nonmetallic inclusions and furthermore specifying hot forging conditions in a secondary working process. SOLUTION: Steel having a compsn. contg., by weight, 0.5 to 0.75% C, 0.5 to 1.8% Si, 0.1 to 1.5% Mn, <=0.020% P, 0.019 to 0.05% Al, <=0.0015% O and 0.003 to 0.015% N, contg., at need, one or more kinds among 0.05 to 0.5% Mo, 0.0003 to 0.005% B, 0.005 to 0.05% Ti, 0.1 to 1.0% Ni, 0.005 to 0.5% V and 0.01 to 0.5% Nb, and the balance Fe is heated to the temp. region of the Ac3 -100 deg.C to the Ac3 +200 deg.C, is forged at >=70% draft in the temp. region, is next cooled at a rate of 0.005 deg.C/sec and is thereafter subjected to induction hardening and tempering treatment to obtain the parts in which the number of oxide nonmetallic inclusions in the steel is regulated to <=2.5/mm<2> and the maximum size thereof is regulated to <=19 μ.
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Inventors:
Toshiyuki Hoshino
Yasuhiro Omori
Yi Geon
Yasuhiro Omori
Yi Geon
Application Number:
JP29589997A
Publication Date:
January 05, 2005
Filing Date:
October 28, 1997
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
C21D8/00; C21D1/10; C21D9/32; C22C38/00; C22C38/06; C22C38/14; (IPC1-7): C22C38/00; C21D1/10; C21D8/00; C21D9/32; C22C38/06; C22C38/14
Domestic Patent References:
| JP9041085A |
Attorney, Agent or Firm:
Tetsuya Mori
Yoshiaki Naito
Cui Shu Tetsu
Yoshiaki Naito
Cui Shu Tetsu