Method of making stainless steel having improved machinability

Details Method of making stainless steel having improved machinability Method of making stainless steel having improved machinability

1974-08-12

1976-01-20

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75 57, 75 58, 751305, C22C 3300, C21C 700

Patent

active

039334805

ABSTRACT:
Improved machinability of stainless steels, as determined by production-type operation of automatic screw machines, is obtained: by providing globular inclusions in the steel, which comprise essentially sulfur and selenium or tellurium, in combination with manganese, and which maintain globular character through extensive reduction as by hot rolling, the proportions of such elements being controlled to produce the inclusions, very preferably with a specific, relatively low and economical addition of selenium or tellurium; and also by controlling the actual presence of aluminum oxide in the steel, including the control of deoxidation practice, to provide production of stainless steel having not more than a critically very low content of aluminum oxide. In martensitic grades, the improved stainless steels are further enhanced in machinability, e.g. as to chip characteristics, by special heat treatment, including heating between the A.sub.1 and A.sub.3 critical points of temperature. Optional additions of rare earth elements can coact in establishing or enhancing the desired, e.g. sulfide-selenide, inclusions, and can afford deoxidation function effective in avoiding unwanted aluminum addition, for corresponding cooperation in minimizing occurrence of aluminum oxide.

REFERENCES:
patent: 2576782 (1951-11-01), Daley
patent: 2799039 (1961-09-01), Lula
patent: 3235415 (1966-02-01), Palty
patent: 3301663 (1967-01-01), Wicher
patent: 3314782 (1967-04-01), Arnaud
patent: 3459540 (1969-08-01), Tisdale
patent: 3467167 (1969-09-01), Mahin
patent: 3723094 (1973-03-01), Schlatter

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