Cold rolled steel strip with controlled mechanical properties and controlled cutting properties Sulfided and refractory steel bars

摘要

Stanadyne Case 239COLD DRAWN FREE-MACHINING RESULFURIZEDAND REPHOSPHORIZED STEEL BARS HAVING CONTROLLEDMECHANICAL PROPERTIES AND CONTROLLED MACHINABILITYABSTRACT OF THE DISCLOSUREA cold drawn resulfurized and rephosphorized free-machining steel bar has the composition, by weight, C up to0.08%; Mn 0.6% to 1.4%; Si up to 0.1%; P at least 0.03%;S 0.25% to 0.50%; Cb 0.01% to 0.10%; V up to 0.1%; the sum ofNi, 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 X%S) / %Cb is from 2 to 50. The yield strength of the steelbar is further determined by the draft in cold drawing the barfrom the hot rolled state and the size and cross section ofthe bar after draft.