Designation Thickness (mm) Chemical Composition(wt.%) C Si Mn P S Sol-Al POSHRD2 1.8~7.0 ~0.03 ~0.03 ~0.25 ~0.02 ~0.02 ~0.06 - POSHRD2 2.0~7.0 ~0.005 ~0.03 ~0.20 ~0.02 ~0.02 ~0.06 Ti 0.005~0.05 Nb 0.005~0.04 POSHRD3 2.0~7.0 ~0.005 ~0.03 ~0.20 ~0.02 ~0.02 ~0.06 Ti 0.01~0.06
