Effect of manganese on annealing texture, plastic anisotropy, and mechanical properties of low-carbon steels containing 0.067 Pct phosphorus

Abstract

To establish the range of manganese content in phosphorus-containing low-carbon steels that will provide superiorr _m andAr values in cold-rolled sheets, the effects of manganese on annealing texture, plastic anisotropy, and mechanical properties of steels containing 0.067 pct P were studied. Both vacuum and air-melted laboratory heats were investigated. Results show that highr _m and low Ar values, a desirable combination for deepdrawing applications, can be obtained with manganese contents up to 0.25 pct, when the hot-rolled band is cold-rolled 80 pct, and annealed at 710 or 780° (1310 or 1435∮F) for 20 h. Annealing at the higher temperature developed better plastic anisotropy than did annealing at the lower temperature. Ther _m values of the air-melted steels were superior to those of the vacuum-melted steels. It is believed that complex interactions of manganese with other elements in the steel, such as sulfur and oxygen, and possibly carbon, influenced the annealing behavior of the steels.