Quenched and Tempered (+QT1) 1.7231 Cast SteelQuenched and Tempered (+QT2) 1.7231 Cast SteelMechanical Properties Brinell Hardness 240 to 280 Elastic (Young's, Tensile) Modulus 190 GPa 27 x 106 psi Elongation at Break 11 to 12 % Fatigue Strength 360 to 500 MPa 52 to 72 x 103 psi ...