A36 mild carbon steel alloy. Common structural steel in U.S.A. Minimum yield of 36,000 PSI (250 MPa) and ultimate tensile strength of 58,000 to 80,000 PSI (400-550 MPa). Please enter your postal code to check availability. Steel, Angle Stock, 1" x 1" x 3 x 1/8" A36 mild carbon steel alloy. Common structural steel in U.S.A. Minimum yield of 36,000 PSI (250 MPa) and ultimate tensile strength of 58,000 to 80,000 PSI (400-550 MPa).