Cold drawn free-machining resulfurized and rephosphorized steel

Details Cold drawn free-machining resulfurized and rephosphorized steel Cold drawn free-machining resulfurized and rephosphorized steel

1988-06-09

1989-11-14

Yee, Deborah

Metal treatment

Stock

Ferrous

420 87, 420 84, 420127, C22C 3860, C22C 3812

Patent

active

048804797

ABSTRACT:
A resulfurized and rephosphorized free-machining steel bar formed by cold drawing a hot rolled steel bar has the composition, by weight, C up to 0.08%; Mn 0.6% to 1.4%; Si up to 0.1%; P at least 0.03%; S 0.25% to 0/50%; Cb 0.02% to 0.10%; the sum of Ni, Cr, Mo and Cu up to 0.15%; balance iron. The ratio of %Mn/%S is from 1.6 to 4.0, and the ratio of [%Mn-(1.62.times.%S)]/%Cb is from 2 to 50. 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 size and cross section of the bar after draft. The relationship between strength and ductility is further improved by heavy drafting in cold drawing the bar from the hot rolled state.

REFERENCES:
patent: 4056387 (1977-11-01), Cantera et al.

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