Alloy steel powders, sintered bodies and method

Details Alloy steel powders, sintered bodies and method Alloy steel powders, sintered bodies and method

C - Chemistry, Metallurgy

22

C

C22C 38/24 (2006.01) B22F 3/12 (2006.01) C22C 33/02 (2006.01) C22C 38/22 (2006.01)

Patent

CA 2143015

Alloy steel powders capable of obtaining high strength in a sintered state and having excellent compacting compressibility and methods of manufacturing a sintered body. The alloy steel powder comprises, by wt%, about 0.5 - 2% of Cr, not greater than about 0.08% of Mn, about 0.1 - 0.6% of Mo, about 0.05 - 0.5% of v, not greater than about 0.015 of S, not greater than about 0.2% of O, and the balance being Fe and incidental impurities. The alloy steel powder is compacted and sintered at a temperature of about 1100 - 1300°C and then cooled at a cooling rate no higher than about 1°C/s in a temperature range of from about 800°C to 400°C. The alloy steel powder can contain Nb and/or Ti and one or more of Co, W and B. Additionally, Ni powder and/or Cu powder may be adhered and dispersed onto the surface of the alloy steel powder.

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