Title:
PROCESS FOR PRODUCING ANNULAR PART
Document Type and Number:
WIPO Patent Application WO/1992/002326
Kind Code:
A1
Abstract:
A process for producing an annular part excellent in abrasion resistance and mechanical strength, wherein the surface layer of which an abrasion resistance is required has a hardness of HRC (58 to 63) and the inside has a hardness of HRC (25 to 40), said process comprising subjecting a powdery raw material composed of 0.4 to 0.9 wt.% of carbon, 1.5 to 4.0 wt.% of nickel, 0.2 to 0.6 wt.% of molybdenum, and the balance of iron and inevitable impurities to compression molding, sintering, forging, hardening at a temperature ranging from 800 to 950 °C, high-temperature tempering at a temperature ranging from 570 to 700 °C for 20 to 60 min, hardening of the surface layer(s) of the inner and/or outer periphery of the sinter, and if necessary low-temperature tempering at a temperature ranging from 160 to 220 °C.
Inventors:
KOBAYASHI KAZUYA (JP)
NAGAHARA SHIGEYOSHI (JP)
HOSONO HIKARU (JP)
NAGAHARA SHIGEYOSHI (JP)
HOSONO HIKARU (JP)
Application Number:
PCT/JP1991/001058
Publication Date:
February 20, 1992
Filing Date:
August 07, 1991
Export Citation:
Assignee:
MITSUBISHI MATERIALS CORP (JP)
International Classes:
B22F3/24; B22F5/10; C21D1/10; C21D9/40; C22C33/02; (IPC1-7): B22F3/24; C21D9/40; C22C33/02
Foreign References:
| JPS63227751A | 1988-09-22 | |||
| JPS54104406A | 1979-08-16 | |||
| JPS5538983A | 1980-03-18 |
Other References:
See also references of EP 0543010A4
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