1.seamless steel pipe 2.material:material:ST37,ST35.8,ST44,ST45, ... black, pipe cap, steel strips bundled.Applications range petroleum, construction ,shipbuilding,smelting, aviation, power, foodstuff, papermaking, chemical, medical equipment, boiler heat, ... .Special design available according to requirement2.anti-corrosion and high-temperature resistant with black painting3. All the production process ...