High strength steel powder, method for the production...

B - Operations – Transporting – 05 – D

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B05D 3/12 (2006.01) B22F 1/02 (2006.01) B22F 7/00 (2006.01) B32B 5/16 (2006.01) B32B 15/00 (2006.01) C21D 7/00 (2006.01) C22C 38/12 (2006.01) C23C 8/10 (2006.01) C23C 8/14 (2006.01) C23C 22/05 (2006.01) C23C 22/07 (2006.01)

Patent

CA 2364453

Steel powder for use in case hardenable steels is provided. The steel powder is made from a plurality of pre-alloyed iron-molybdenum particles. Each of the particles has from about 1.5 to about 3.5 percent by weight of molybdenum and have a diameter of from about 20 to about 200 microns. The powders further have from about .001 % by weight to about 0.5 % by weight of a coating. The coating is made up of from about 40 % to about 85 % by weight of one or more of FeO, Fe3O4, Fe2O3, (Fe2O3.H2O) and combinations thereof; and from about 15 % to about 60 % by weight of one or more of FePO4, Fe3(PO4)2, FeHPO4, Fe3 (PO4)2. 2H2O, Fe2(PO4)3.8H2O, FeCrO4, FeMoO4, FeC2O4, and FeWO4. Also provided is a steel powder composition for use in manufacturing sinter hardenable structural parts. The powder is made from a plurality of pre-alloyed steel particles of from about 0.5 to about 3.5 percent by weight of molybdenum, from about 0 % to about 0.5 % by weight nickel and from about 0 % to about 0.6 % manganese and from about 0.05 to about 0.08 percent by weight of the mixture of particulates of graphite. The particles have a diameter of from about 20 to about 200 microns and each of the particles has from about 0.5 % by weight to about 2 % by weight of a coating disposed thereon. The coating is a substantially uniform metallurgical layer of one or more of copper, cobalt, nickel, and chromium. An article made by compressing this steel powder composition has an as pressed "green" strength of at least about 10 Kpsi as measured in accordance with MPIF 41 (ASTM B312/B528).

La présente invention concerne une poudre d'acier pour aciers durcissables. La poudre d'acier est faite de plusieurs particules de molybdène de fer pre-alliées. Chacune de ces particules contient environ 1,5 à environ 3,5 pour cent en poids de molybdène et a un diamètre d'environ 20 à environ 200 microns. Les poudres ont, de plus, un revêtement d'environ .001 % à environ 0,5 % en poids. Ce revêtement est fait d'environ 40 % à 85 % en poids d'un ou plusieurs éléments parmi FeO, Fe¿3?O¿4?, Fe¿2?O¿3?, (Fe¿2?O¿3?.H¿2?O) et de combinaisons en résultant, et d'environ 15 % à 60 % de FePO¿4?, Fe¿3?(PO¿4?)¿2?, FeHPO¿4?, Fe¿3? (PO¿4?)¿2?. 2H¿2?O, Fe¿2?(PO¿4?)¿3?.8H¿2?O, FeCrO¿4?, FeMoO¿4?, FeC¿2?O¿4?, et FeWO¿4?. L'invention concerne également une composition de poudre d'acier qui s'utilise dans la fabrication de pièces structurelles durcissables par frittage. La poudre est faite de plusieurs particules d'acier pre-allié d'environ 0,5 à environ 3,5 pour cent en poids de molybdène, d'environ 0 % à environ 0,5 % en poids de nickel et d'environ 0 % à environ 0,6 % de manganèse et d'environ 0,05 à environ 0,08 pour cent en poids du mélange de particules de graphite. Les particules ont un diamètre d'environ 20 à environ 200 microns et chacune de ces particules est recouverte d'un revêtement d'environ 0,5 % à environ 2 % en poids. Ce revêtement constitue une couche métallurgique sensiblement uniforme contenant un ou plusieurs des éléments suivants: cuivre, cobalt, nickel, et chrome. Un article fabriqué par compression de cette composition de poudre d'acier présente une résistance "à vert" comprimée d'au moins environ 10 Kpsi mesurée conformément à MPIF 41 (ASTM B312/B528).

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