Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1974-02-04
1979-02-20
Dean, R.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75123K, 75123L, 75123M, 148 124, 148 36, 148 39, C22C 3802
Patent
active
041405242
ABSTRACT:
A low alloy temper resistant saw blade steel containing about 0.90-1.4% carbon, 0.8-2% silicon, 0.5-1.5% vanadium, 1-3% tungsten plus twice the percent molybdenum, and the balance iron plus incidental impurities having a minimum hardness of Rc 60 in its hardness and tempered condition and which is not softened by exposure to temperatures of about 600.degree. F. A process for preparing the steel is also disclosed in which the alloy is hot worked to strip which is then austenitized, isothermally transformed at least in part to bainite, and subjected to a subcritical anneal to form a pinpoint carbide structure with hardness reduced sufficiently to facilitate fabrication of the saw teeth. After the saw teeth are formed and set, the heat treatment is completed by flame hardening the teeth and tempering so that the teeth are at a minimum hardness of about Rc 60 and do not soften when exposed to temperatures of about 600.degree. F.
REFERENCES:
patent: RE17846 (1930-10-01), Brown
patent: 1680301 (1928-08-01), Norris
patent: 1927986 (1933-09-01), Levy
Oberholtzer James R.
Philip Thoni V.
Carpenter Technology Corporation
Dean R.
Jay Edgar N.
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