CARBON STEEL LINE PIPE. page. 10-11. CORROSION RESISTANT ALLOY LINE PIPE. page. 12-13. DP25U. page. 14-15 All the supply records for most of the severe environment of pipe line project indicate that NIPPON STEEL is the leader in line pipe technologies. We have been supplying high quality SEAMLESS STEEL LINE PIPE with most advanced technologyA53 Seamless & Welded (ERW) Steel Pipe ASTM A53 ASTM Specification A53 covers seamless and welded, black and hot-dipped galvanized nominal (average) wall pipe for coiling, bending, flanging and other special purposes and is suitable for welding. U. S. Steel Tubular Products does not produce galvanized pipe.