... )Wall thickness1.8mm-30mmstandardAPI5L,API5CT,ASTM-A106,ASTM-A53,SY5037-2000,GB/T5711.1-1997MaterialX42,X52,X60,X65,X70,Q235,Q345 ... painting3) All the production process are made under ISO 9001-2000 strictly. (1) Quality:Q195 Q215 Q235 Gra. A Gra. B ... ( dot ) com or skpye : yinyin6340waiting for your kindly reply .Thanks SY/T0413 polyethylene coated steel pipe