Soft steel for machine cutting and method of producing it

Details Soft steel for machine cutting and method of producing it Soft steel for machine cutting and method of producing it

1989-12-01

1990-12-18

Yee, Deborah

Alloys or metallic compositions

Ferrous

Over 0.05 percent sulfur, over 0.04 percent phosphorus or...

420 84, 420 85, 420 88, 420129, 75567, 75568, C22C 3860

Patent

active

049784994

ABSTRACT:
A soft steel for machine cutting with high machinability performances having a content of C.ltoreq.0.25%, a content of Mn of 0.8 to 1.5%, a content of P of .ltoreq.0.1%, a content of S of 0.15 to 0.40%, and a content of Si of 0.05 to 0.40%, expressed in percentages by weight. After finishing of the metal, the inclusions of manganese sulfide are surrounded by a plastic oxide layer of an average composition SiO.sub.2 : 35 to 45%; Al.sub.2 O.sub.3 : 10 to 20%; CaO: 15 to 25%; MnO: 10 to 20%. In producing this grade, after the addition of silicon and manganese, the liquid metal is agitated in the presence of a slag of a composition CaO: 20 to 55%; SiO.sub.2 : 35 to 65%; Al.sub.2 O.sub.3 : 15 to 40%; with a CaO %/SiO.sub.2 % ratio of about 1.

REFERENCES:
patent: 3844773 (1974-10-01), Yamakoshi et al.
patent: 3948649 (1976-04-01), Tetsuo Takahashi et al.
patent: 3973950 (1976-08-01), Itoh et al.
patent: 4881990 (1989-11-01), Pielet et al.

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