51 stainless steel pipe network introduction common wear-resisting steel composition brand chemical composition% C Mn Si P ≤ S ≤ Cr ZGMn13-1 1.10 ~ 1.50 11.0 ~ 14.0 0.30 ~ 1.00 0.09 0.05 ZGMn13-2 1.00 ~ 1.40 11.0 ~ 14.0 0.30 ~ 1.00 0.09 0.05 ZGMn13-3 0.90 to 1.30 11.0 to 14.0 0.30 to 0.80 0.08 0.05 ZGMn13-4 0.90 to 1.20 11.0 to 14.0 0.30 to 0.80 0.07 0.05 ZGMn13Cr2 0.90 to 1.30 11.0 to 14.0 ≤ 0.80 0.07 0.04 1.50 to 2.50 ZGMn14 1.12 to 1.25 13.0 to 15.0 0.30 to 1.00 0.055 0.05 ≤ 0.60