DN450 Seamless Steel Pipe Outside Diameter

Seamless steel pipe OD is divided into large OD and small OD, small OD is 478mm, large OD is 457mm. Seamless steel pipe is a kind of long steel with a hollow section and no seams around it.According to the different production methods, it is classified into hot-rolled pipe, cold-rolled pipe, cold-drawn pipe, extruded pipe, top pipe and so on secondly.According to the shape of the cross-section, seamless steel pipe is divided into two kinds of round and heteromorphic. According to the different uses, it can be classified into thick-walled seamless steel pipe and Thin-walled seamless steel pipe.

I. Classification of seamless steel pipe

1, along the perimeter of its cross-section seamless steel pipe. According to the different production methods are divided into hot-rolled tube, cold-rolled tube, cold-drawn tube, extruded tube, top tube, etc., all have their own process regulations.

2、Materials are ordinary and high-quality carbon structural steel] (Q215-A to Q275-A and 10 to 50 steel), low alloy steel (09MnV, 16Mn, etc.), alloy steel, stainless and acid-resistant steel, and so on.

3, according to use is divided into general purpose (for water, gas pipelines and structural components, mechanical parts) and specialized (for boilers, geological exploration, bearings, acid-resistant, etc.) two categories.

Second, the use of seamless steel pipe

Seamless steel pipe has a hollow cross-section, used in large quantities as a pipeline for the transportation of fluids, such as pipelines for the transportation of oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, steel pipe is lighter in weight when the bending and torsion strength is the same, and it is a kind of economic cross-section steel.

Widely used in the manufacture of structural and mechanical parts, such as oil drilling rods, automobile drive shafts, bicycle frames and steel scaffolding used in building construction, etc. Use of steel pipe to manufacture annular parts, can improve the material utilization rate, simplify the manufacturing process, save materials and processing time, has been widely used in the manufacture of steel pipe.

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