Patent ID: 6485540
Filing Date: 2002-11-26
Classification: B22F,C22C

Abstract:
A method of providing a material having tensile strength greater than 100 ksi, yield strength greater than 80 ksi, RC hardness of at least 20, and elongation greater than 2.0%, the method comprising:providing a metallurgical powder including a low alloy steel powder and 0.3 up to 1.0 weight percent carbon; forming a compact from at least a portion of the metallurgical powder by pressing at least a portion of the metallurgical powder in a mold at 20 to 70 tsi; heating the compact to a temperature greater than 1800Â° F. and less than the melting temperature of the metallurgical powder to bond together the metallurgical powder and form a sintered compact; pressing the sintered compact at 20 to 80 tsi in a heated die while the compact is at a temperature of 1400Â° F. to 2000Â° F.; and heating the pressed sintered compact to a temperature of 1000Â° F. to 2300Â° F. and below the melting temperature of the compact to re-sinter the compact.