... Grade: AISI4140, KP42, A48CPR, SA612M, 07MnNiMoVDR, 07MnCrMoVR, 12MnNiVR, WDB620 / Q500FC7>. GB Q245R, Q345R, 16MnDR, Q370R, 09MnNiDR, 18MnMoNbR, 15MnNiDRHSLA/ High Strength Low Alloy Steel ... Plate: 1>. Standard: ASTM Grade: A572 Grade 50, A709 Grade 50, A633D, A633E, A588 Grade B2>. Standard: JIS G3106 Grade: SM490B, SM520 ...