National standard for seamless steel pipe

National standard for seamless steel pipe

The standard and allowable deviation of seamless steel pipe wall thickness are different. Generally, pipeline construction depends on the situation. The type of liquid transported, the flow rate and the static pressure head all affect the selection of steel pipe.

Absolute deviation of outer diameter of special purpose steel pipe and cold rolled (drawn) steel pipe can be adopted. The allowable wall thickness deviation can be divided into standardized and non-standardized. The standardized allowable wall thickness deviation should be preferred.

Implementation standard of seamless steel pipe:

1. the structure of seamless pipe (GB/T8162-2008) is used for general structure and mechanical structure of seamless steel pipe.

2. seamless steel pipe for fluid transportation (GB/T8163-2008) is used for conveying water, oil, gas and other fluids of the general seamless steel pipe.

3. low and medium pressure boiler with seamless steel pipe (GB3087-2008) is used for manufacturing all kinds of structure of low and medium pressure boiler superheated steam pipe, boiling water pipe and locomotive boiler with superheated steam pipe and arch brick pipe of high-quality carbon structural steel hot rolled and cold drawn (rolled) seamless steel pipe.

4. high pressure boiler with seamless steel pipe (GB5310-2008) is used for manufacturing high pressure and above the water tube 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 fertilizer equipment (GB6479-2000) is suitable for chemical equipment and pipelines working temperature of -40~400℃, working pressure of 10~30Ma of high-quality carbon structural steel and alloy steel seamless steel pipe.

Seamless steel pipe has a wide range of uses. General purpose seamless steel tubes are rolled by ordinary carbon structural steel, low alloy structural steel or alloy structural steel, and have the largest output. They are mainly used as pipes or structural parts for conveying fluids.

Supply is divided into three categories according to different uses: according to chemical composition and mechanical properties; Supplied according to mechanical properties; Supplied by hydrostatic test. Steel tubes supplied according to class a and Class b, if used to withstand liquid pressure, shall also be subjected to hydrostatic tests.

The special use of seamless tube boiler seamless tube, chemical power, geological seamless steel pipe and petroleum seamless tube and so on.

Seamless steel pipe has hollow section, widely used for conveying fluid pipeline, such as conveying oil, natural gas, gas, water and some solid materials, etc. Compared with solid steel such as round steel, steel pipe is a kind of economic section steel because of its light weight and the same bending and torsional strength.

It is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and steel scaffolding used in construction. It can improve the utilization rate of materials, simplify the manufacturing process, save materials and processing hours, and has been widely used in the manufacture of steel pipe.