... the steel plate as follows.Steel grade:Carbon structural plate: SS400,S235JR,A36,Q195 Q215-255A,BNormal low alloy plate: S355JR, ... SM490,Q295 Q345 Q390 Pressure vessel plate: A572 GR60,16MnR, 20R, 15MnVRBoiler plate: A572,20g 16MngHigh ... quality carbon plate: S45C,S10C,S20C, ...