buy spiral steel pipe Q235 standard:API,ASTM,ASME ... material:API 5L, A53,A106,A333 GR6,Q235,Q345 buy spiral steel pipe Q235 SSAW (Spiral Submerged-arc Welded) ... , black painting. Epoxy Coating according to AWWA C-210 Bitumen Coating according to DIN30672, BS534 Coal- Tar Enamel Coating ... Inside lining: Epoxy lining according to AWWA C-210 Bitumen Lining according to DIN30673, BS534 Coal-Tar Enamel Lining ...