Check API 5L X65 Welded Pipe Specification, API 5L X65 ERW Pipe, View CS API 5L X42 ERW Pipe Properties. Navstar Steel is a leading supplier and manufacturer of the API 5L X52 ERW Pipe and other types in the 5L standard. The material has high wear and tear resistance. It is a carbon steel that is tough and has high stress resistance. The API 5L Welded Pipe is produced from a strip or a piece of carbon API 5L Welded (ERW, LSAW, SSAW) Steel Line PipeOctal supply API 5L welded (ERW, EFW, LSAW, SSAW) steel line pipe in Gr B, X42, X46, X52, X56, X60, X65, X70, X80 PSL1, PSL2 and for sour service (NACE pipe). Line pipe brief introduction. API 5L steel line pipe is for oil and gas industries pipelines, developed for different working environments.