Title:
ALLOY STEEL POWDER FOR SINTER WITH HIGH STRENGTH, HIGH FATIGUE STRENGTH AND HIGH TOUGHNESS, SINTER, AND PROCESS FOR PRODUCING THE SINTER
Document Type and Number:
WIPO Patent Application WO/1994/027764
Kind Code:
A1
Abstract:
A chromium-base alloy steel powder for high-strength sinter with high tensile strength, high fatigue strength and high toughness suitable for the use as automotive parts, office automation equipment parts and the like. The steel powder comprises, on the weight basis, at most 0.1 % of carbon, at most 0.08 % of manganese, 0.5-3 % of chromium, 0.1-2 % of molybdenum, at most 0.01 % of sulfur, at most 0.01 % of phosphorus, at most 0.2 % of oxygen, and if necessary at least one member selected between 0.2-2.5 % of nickel and 0.5-2.5 % of copper, the balance consisting of unavoidable impurities and iron. The sinter has a similar composition except that the carbon content is particularly restricted to 0.2-1.2 %. The production process comprises compacting the powder, sintering the compact at a temperature of 1,100 to 1,300 �C, and either immediately cooling the sinter at a cooling rate of 10-200 �C/min, or carburizing and heat treating the sinter.
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Inventors:
UNAMI SHIGERU (JP)
FURUKIMI OSAMU (JP)
FURUKIMI OSAMU (JP)
Application Number:
PCT/JP1993/001141
Publication Date:
December 08, 1994
Filing Date:
August 12, 1993
Export Citation:
Assignee:
KAWASAKI STEEL CO (JP)
UNAMI SHIGERU (JP)
FURUKIMI OSAMU (JP)
UNAMI SHIGERU (JP)
FURUKIMI OSAMU (JP)
International Classes:
C22C33/02; C22C38/00; C22C38/22; (IPC1-7): B22F1/00; C22C33/02; C22C38/00
Foreign References:
| US4266974A | 1981-05-12 | |||
| JPS58107469A | 1983-06-27 | |||
| JPS6347302A | 1988-02-29 |
Other References:
See also references of EP 0653262A4
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