Business 1. astm a307 mechanical properties and head marking

1. Tension Stength Yield Strength Enlogation Length ksi ksi % in. Brinell Rockwell B ＜3*D 121-241HRB 69-100HRB ≥3*D 241max 100max ＜3*D 121-212 69-95 ≥3*D 212max 95max…