HLT has 3 longitudinally H.F. welded pipe producing lines, 6 spirally double-side submerged arc welded pipe producing lines, which can produce longitudinally welded steel pipes with diameter ranging from 88.9 to 457.2mm and wall thickness ranging from 4.00 to 16mm, spirally double-sided submerged arc welded steel pipe with diameter ranging from 219mm to 3000mm and wall thickness ranging from 5.0 to 22.0mm，with total annual capacity 300,000 tons. Our products comply with various standards such as API 5L/5CT, ASTM, DNV, ISO, DIN, EN, BS, CE, etc. HLT also can do all kinds of anti-corrosion pipes, such as: FBE, 2PE, 3PE, epoxy coal asphalt, inside and outside solvent free epoxy lining, cement mortar lining that meet international coating standards