LOW-CARBON AUTOMATIC STEEL Russian patent published in 2017 - IPC C22C38/60 

FIELD: metallurgy.

SUBSTANCE: steel contains, wt %: carbon 0.09-0.14, manganese 1.20-1.43, silicon no more than 0.05, lead 0.15-0.30, aluminium no more than 0.007, sulfur 0.20-0.35, chromium is no more than 0.25, nickel is no more than 0.20, calcium is no more than 0.001, iron is the rest. The ratio of the carbon content to the maximum value of the aluminium content is no more than 20, the ratio of the silicon content to the aluminium content is no more than 10, and the ratio of manganese content to sulfur content is at least 4.

EFFECT: high machinability by cutting and no defects in rolled products in the form of stress cracks.

4 dwg, 3 tbl