... , Q370R, 09MnNiDR, 18MnMoNbR, 15MnNiDRHSLA/ High Strength Low Alloy Steel Plate: 1>. Standard: ASTM Grade: A572 Grade 50, ... (L390), X60 (L420), X65, X70Quenching and Tempering High Tensile Steel Plate: Standard: Special ConditionGrade: WH70Q, WQ590D, Q550DThe ... annealing, tempering, quenching, normalizing plus tempering, quenching and tempering, and other delivery states are available. Tests: HIC, SSC ...