Tianjin youfa steel pipes group (youfasp), TOP 500 in China, a leading manufacturer and exporter of steel pipes, black, galvanized, spiral, steel-plastic, scaffolding, line pipe, casing and tubing etc., od 21-2034mm wt 1.8-18mm, BS 1387, ISO 65, ASTM A53, DIN 2440,2444, EN 10219, EN 39, API 5L, API 5CT etc.,50 production lines with 3,000,000 tons production capacity per year.learn more from www youfasp dot com, contact email youfasp at gmail dot com.