This specification covers seamless and welded steel line pipe. It includes plain-end, threaded-end, and belled-end pipe, as well as through-the-flowline (TFL) pipe and pipe with ends prepared for use with special couplings. Gangsteel is specialized in supplying API 5L steel plate in X80.API 5L X52|X52 STEEL PLATE__Steel SupplierAPI 5L standard specification for line pipe. The purpose of this specification is to provide standards for pipe suitable for use in conveying gas, water, and oil in both the oil and natural gas industries. This specification covers seamless and welded steel line pipe.