Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1998-02-09
1999-08-10
Mai, Ngoclan
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75231, 75243, 75244, 75252, 75254, 419 11, 419 23, 419 38, 419 47, 419 57, C22C 3302
Patent
active
059361700
ABSTRACT:
A blend of pre-alloyed stainless steel powder for use in producing sintered stainless steel, said powder consisting essentially of, by weight, up to 0.05% carbon, 22% to 26% chromium, 10% to 24% nickel, 2.7% to 5% molybdenum, 0.1% to 1% boron, up to 2.0% manganese, up to 2.0% silicon, balance iron and residuals, together with manganese sulfide particles added thereto until they comprise up to 4%, by weight, of the overall blend, experimental results having shown that the blend offers significant improvements in the machinability of the resulting steel. The patent also claims a method for making sintered steel using the blend, as well as the sintered steel resulting from the process.
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S. Nigarura, et al. The Influence of Powder Process on the Nature of Inclusions and Its Relation to the Machinability of MnS Prealloyed P/M Parts. Metal Powder Industries Federation. 105 College Rd. East, Princeton, New Jersey 08540-6692, USA. 1992. 223-.
H. Sanderow, et al. The Effect of Manganese Sulfide on the Mechanical Properties of P/M Steels. Adv. Powder Metall. Part. Mater. (1993) vol. 4, Processing, Properties, and Applications, pp. 97-108.
S. St-Laurent, et al. The Effect of Sulfur Content on Machinability of Forged Specimens Made of Water Atomized Steel Powders Pre-Alloyed with MnS. Adv. Powder Metall. Part. Mater. vol. 2, 15/95-15/109, 1997.
Hanlin, Sr. David J.
Reen Orville W.
Intech P/M Stainless Steel, Inc.
Mai Ngoclan
Wargo Kenneth W.
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