1.seamless steel pipe 2.material:material:ST37,ST35.8,ST44,ST45,ST52; ... 1629,1630,17175,2391,2448MaterialST37,ST35.8,ST44,ST45,ST52Packagingpainting black, pipe cap, steel strips bundled.Applications range petroleum, construction ,shipbuilding,smelting, aviation ... according to requirement2.anti-corrosion and high-temperature resistant with black painting3. All the production process are made under the ...