1、A992 /Q345B/ AISI 1022/20Mn comparisonChemical RequirementsStd. Designation Grade C Si Mn P S V Nb Ti Cr Ni Cu Mo NASTM A992 50 0.23 0.4 0.5-1.5 0.035 0.045 0.11 0.05 0.35 0.45 0.6 0.15 0.015Chinese GB Q345 B 0.2 0.55 1-1.6 0.04 0.04 0.02-0.15 0.015-0.06 0.02-0.20 AISI 1022 0.18-0.23 0.15-0.35 0.7-1
2、.0 0.03 0.05Chinese GB 20Mn 0.17-0.24 0.17-0.37 0.7-1.00.0350.0400.250.250.25Mechanical property:Std. Designation Grade Tensile strength, min MPa Yield point Yield to tensile ratio,max Elongation in 200mm, min. % Elongation in 50mm, min. %ASTM A992 50 450 345-450 0.85 18 21Chinese GB Q345 B470-630 16-35mm, 32521AISI 1022 429 317 35Chinese GB 20Mn450 275 24
