Cold drawn free-machining steel bar including bismuth

Details Cold drawn free-machining steel bar including bismuth Cold drawn free-machining steel bar including bismuth

1986-06-10

1988-05-03

Yee, Deborah

Metal treatment

Stock

Ferrous

420 84, 420 87, C22C 3860

Patent

active

047417862

ABSTRACT:
A cold drawn free-machining steel bar having a composition consisting essentially of, in weight percent, C up to 0.15; Mn 0.7 to 1.3; P 0.03 to 0.09; S 0.30 to 0.50; Bi 0.05 to 0.25; the sum of Ni, Cr, Mo and Cu up to 0.15 and the balance iron. The ratio % Mn / %S is from 1.7 to 3.0 and the %Mn-1.62.times.%S is from 0.05 to 0.40. The ratio %Bi /(%Ni+%Cu) is at least 2.0. The yield strength of the steel bar is further determined by the draft in cold drawing the bar from the hot rolled state and the cross section of the bar prior to draft.

REFERENCES:
patent: 4255187 (1981-03-01), Bhattacharya et al.
patent: 4255188 (1981-03-01), Riekels
patent: 4333776 (1982-06-01), Bhattacharya et al.

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