Japanese standard steel plate grades from China SB450M Chemical composition of pressure vessel plates&Mechanical properties
SB450M Approaching Steel Plate Grade Lookup Table

Grade Chemical composition Mechanical properties Remark
C Mn Si S P Ni Al Cr Cu Mo … ReH Rm KV₂ Elongation:
2 inches [50 mm] %
SB450M 0.25 0.98 0.45 0.03 1.03 0.45-0.60 255 450-590 19