... thickness of the structural steelQ345A(B,C,D,E)S355N,S355NLA572Gr42(50)16MnD20,50,4520MnSiGB/T1591-2008EN10025- ... P355NL1, P355NL2P355NL2, A516Gr55(60,65,70)A299A517GrQ(A,B,E,F, H , P,S,)EN10028-3:2003ASTM A516/A516M ... A299M-03ASTM A517/A517M-06Ship, platform steelA514GrQ(A,B,E,F, H , P,S,)DH36,EH36,FH36ASTM A514 ... roughness can be controlled as 5mm / m. super thick steel low alloy steel plate S355J2G3