... / Q500FC7>. GB Q245R, Q345R, 16MnDR, Q370R, 09MnNiDR, 18MnMoNbR, 15MnNiDRHSLA/ High Strength Low Alloy Steel Plate: 1>. Standard: ASTM Grade: A572 Grade 50, A709 Grade ... (L360), X56 (L390), X60 (L420), X65, X70Quenching and Tempering High Tensile Steel Plate: Standard: Special ConditionGrade: WH70Q, WQ590D, Q550DThe property of Z15, Z25 ...