The Maoming import large diameter thick-walled tube / ductile iron pipe manufacturers 
 Large diameter thick wall steel pipe ~ ~ Shandong Steel Pipe Co., Ltd. in the East China Sea, is located in the scenic Jiangbei Water City --- Liaocheng, is a main alloy tube, high pressure boiler tubes, seamless pipe of large enterprises, perennial spot sales of steel, the package Steel, Anshan Iron and Steel, Metallurgical Steel, Baoshan Iron and Steel, Hengyang Steel, Xining Special Steel, Tianjin and other major steel production of high quality GB seamless steel pipe - structural tube (GB/T8162- 1999), the fluid tube (GB/T8163-1999) low and medium pressure boiler pipe (GB3087-1999), high-pressure boiler pipe (GB5310-1995), fertilizer dedicated pipe (GB6479-2000), petroleum cracking tubes (GB9948-2000), hydraulic support tube (GB/T17396-1998) and domestic imports of alloy pipe, straight seam welded pipe, spiral welded pipe, large diameter, special thick-walled pipe, piling, columns, special axle tube. 
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 Large diameter thick wall steel pipe used primarily as a place of mechanical processing, production of the fuel tank! Usually more than the outer diameter of the large diameter thick wall steel pipe 200mm, wall thickness more than 20mm of steel pipes, the largest diameter can reach 1220mm, wall thickness can reach 80mm. The production technology of large diameter thick wall steel pipe generally includes hot-rolled, hot rolled, casting and other production methods! The large diameter thick wall steel pipe more common in double-sided submerged arc welding production process, product by bending, commissure, welding, outside welding, straightening, first-class multi-level process, to achieve the American Petroleum Institute standard requirements. The large diameter thick wall steel pipe used in more than a large steel structure construction, to do the main support section, for example, a bridge piling, the undersea piling, high-rise buildings piling. The material is generally used Q345B, Q345C. Lower temperature region will be used Q345D Q345E. The production process tube round → heating → perforation → the three-roll cross rolling, rolling or extrusion → detached → sizing (or reducing) → cooling → straightening → hydrostatic test (or testing) → marker → storage 
 Steel pipe weight formula [(OD - Wall Thickness) * Wall thickness] * 0.02466 = kg / m (per meter weight) 
 The Maoming import large diameter thick-walled tube / ductile iron pipe manufacturers