Free cutting steel

Details Free cutting steel Free cutting steel

1974-03-01

1976-04-06

Rutledge, L. Dewayne

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75123F, 75123N, 75123J, 75126B, 75126C, 75126G, 75126R, 75128W, C22C 3860

Patent

active

039486494

ABSTRACT:
A free cutting steel for construction of machines, characterized in that the deoxidation product remaining in the steel has a composition of 40-60% of SiO.sub.2, 10-30% of MnO and 5-25% of Al.sub.2 O.sub.3, the balance being other oxides such as CaO and the sum of contents of SiO.sub.2, MnO and Al.sub.2 O.sub.3 being so adjusted as to be at least 85% of the whole oxides in the deoxidation products, the steel being further incorporated with 0.02 - 0.10% of Pb, and that the non-metallic composite inclusions comprising sulfides and finely divided Pb particles are uniformly dispersed.

REFERENCES:
patent: 2236479 (1941-03-01), Harder
patent: 2914400 (1959-11-01), Roberts
patent: 3203788 (1965-08-01), Contractor
patent: 3630723 (1971-12-01), Asada
patent: 3634074 (1972-01-01), Ito et al.
patent: 3729293 (1973-04-01), Steven
"The Electron-Probe Microanalysis Oxide oxide Inclusions in Steel", Ridal et al., Journal of the Iron and Steel Inst., Oct. 1965, pp 995-997.

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