hot oil boiler steel pipe 1Manufacturing Technology:melted steel 2. ... for mechanical and pressure use, and also for transporting steam, water, gas and etc. 2. Reference standard: ASTM, JIS, ... DIN, and GB.3. Manufacturing technology: hot-rolling and cold-drawing.4. Chemical composition: C≤0.3Mn ... to your orderSupply ability8000 tons per monthpicture example: hot oil boiler steel pipe