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

C - Chemistry, Metallurgy

22

C

75/119, 75/124

C22C 38/04 (2006.01) C22C 38/22 (2006.01) C22C 38/44 (2006.01) C22C 38/60 (2006.01)

Patent

CA 1301490

Stanadyne Case 240 COLD DRAWN FREE-MACHINING STEEL BAR INCLUDING BISMUTH ABSTRACT OF THE DISCLOSURE 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 X %S is from 0.05 to 0.40. The ratio %Bi / (%Ni + %Cu) is at least 2Ø 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.

538743

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