... and characteristics No., standard, varietyStamping steelDX51D+Z,DX51D+ZFGB/T 2518Ordinary use, mechanical seaming, deep punching, and ultra-deep ... ,DX53D+ZFDX54D+Z,DX54D+ZFStructural steelS220GD+Z,S220GD+ZFGB/T 2518Used for structure. Good corrosion resistance and processability.S250GD ... +Z,S320GD+ZFS350GD+Z,S350GD+ZFS550GD+Z,S550GD+ZFGB/T 2518Include low-alloy high-strength steel, and dual-phase ...