Japanese standard steel plate grades from China SB450 Chemical composition of pressure vessel plates&Mechanical properties
SB450 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] %
SB450 0.33 0.98 0.45 0.03 1.03 - 245 450-590 19