Petroleum API pipe CARBON STEEL:Astm a 53/106/ API 5LA/ ... Technique:Hot Rolled or Cold Rolled Size:1/2"-24" Petroleum API pipeMaterial:1. CARBON STEEL: Astm a 53/106/ API ... . Application: The products are widely used in oil & gas, fertilizer, petroleum, boiler, power station, shipping military, chemical industry, environment protection, traffic ...