Seamless steel pipe wall thickness standards and allowable deviations are different, general pipeline construction according to the situation, the type of liquid transported, flow, static pressure head affects the selection of the steel pipe, should be calculated in advance the theoretical wall thickness.
Special-purpose steel pipe and cold rolled (drawn) steel pipe outside diameter allowable deviation can be used absolute deviation. Wall thickness allowable deviation is divided into standardized and non-standardized two, should give priority to standardized wall thickness allowable deviation.
The range of allowable deviation of wall thickness of national standard of seamless steel pipe:
Executive standard of seamless steel pipe:
1. Seamless pipe for structural use (GB/T8162-2008) is a seamless steel pipe used for general structure and mechanical structure.
2, seamless steel pipe for fluid transportation (GB/T8163-2008) is a general seamless steel pipe used for transportation of water, oil, gas and other fluids.
3, low and medium pressure boiler seamless steel pipe (GB3087-2008) is used to manufacture a variety of structural low and medium pressure boiler superheated steam pipe, boiling water pipe and locomotive boiler superheated steam pipe and arch brick pipe with high quality carbon structural steel hot-rolled and cold-drawn (rolled) seamless steel pipe.
4, high-pressure boiler seamless steel pipe (GB5310-2008) is used in the manufacture of high-pressure and above the pressure of water pipe boiler heating surface with high-quality carbon steel, alloy steel and stainless heat-resistant steel seamless steel pipe.
5, high-pressure seamless steel pipe for chemical fertilizer equipment (GB6479-2000) is a high-quality carbon structural steel and alloy steel seamless steel pipe for chemical equipment and pipelines with working temperature of -40~400℃ and working pressure of 10~30Ma.
Expanded InformationSeamless steel pipe has a wide range of uses. General-purpose seamless steel pipe is rolled from ordinary carbon structural steel, low alloy structural steel or alloy structural steel, with the highest output, and is mainly used as pipelines or structural parts for conveying fluids.
Supplied in three categories according to different uses: supplied according to chemical composition and mechanical properties; supplied according to mechanical properties; supplied according to hydraulic test. Steel pipe supplied according to category a, b, such as for bearing liquid pressure, also need to carry out hydraulic test.
Seamless tubes for specialized purposes include seamless tubes for boilers, chemical and electric power, seamless tubes for geological purposes and seamless tubes for petroleum purposes, among many others.
Seamless steel pipe has a hollow cross-section and is 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 driveshafts, bicycle frames, and steel scaffolding used in building construction, etc. Use steel pipe to manufacture annular parts, can improve material utilization, simplify the manufacturing process, save materials and processing time, has been widely used in the manufacture of steel pipe.
Baidu Encyclopedia - Seamless Steel Tube Executive Standard
Baidu Encyclopedia - Seamless Steel Tube