Tianjin YouFa Steel Pipes Group (youfasp), TOP value="500" unitname="in">500 in China, is a leading manufacturer and exporter of steel pipes, black, galvanized, spiral, steel-plastic, scaffolding, line pipe, casing and tubing etc., outside diameter 21value="2034" unitname="mm">-2034mm; wall thickness 1.8value="18" unitname="mm">-18mm, conform to standards BS 1387, ISO 65, ASTM A53, DIN 2440/2444, EN 10219, EN 39, API value="5" unitname="l">5L, API 5CT etc., nearly 50 production lines with a production capacity of approximately 3,000,000 tonnes per year, learn more from www youfasp dot com, contact us by email of youfasp at gmail dot com.