Fluid seamless steel pipe is a long steel with a hollow section and no joints around it. There are more than 5,100 manufacturing plants under more than 1,850 companies in more than 110 countries all over the world, including more than 260 plants under more than 170 companies in 44 countries that manufacture kerosene pipes.

1. Software

Fluid delivery pipes, boiler plants, engineering, machining plants.

two functions

1. The domestic seamless pipe factory provided according to the mechanism function, the general carbon steel is manufactured according to the GB/T700-88 Class A steel (but it must be ensured that the sulfur content does not exceed 0.050% and the phosphorus content does not exceed 0.045%). The performance of the machine should conform to the values specified in the GB8162-87 table.

2. The domestic seamless pipe provided by the hydraulic test must guarantee the hydraulic test specified by the standard.

3. The physical performance test of the fluid seamless steel pipe is carried out according to the relevant standards stipulated in the contract.

3. Function 2.1. The function of seamless pipe is very broad. The general-purpose seamless pipe is rolled from ordinary carbon structural steel, low-alloy structural steel or alloy structural steel.

2. According to the difference in function, it is provided in three categories: a. Provided by chemical factors and mechanical performance; b. Provided by mechanical performance; c. Provided by hydraulic test. Steel pipes provided according to categories a and b, if they are used to withstand liquid pressure, shall also undergo a hydraulic test.

3. There are many kinds of seamless pipes for special functions, such as seamless pipes for boilers, seamless pipes for geological use and seamless pipes for kerosene.

4. Varieties

1. Seamless steel pipes can be divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, extruded pipes, etc. according to the difference in manufacturing techniques.

2. According to the shape, there are round tubes and special-shaped tubes. In addition to square tubes and rectangular tubes, special-shaped tubes include oval tubes, semi-circular tubes, triangular tubes, hexagonal tubes, convex-shaped tubes, plum-shaped tubes, etc.

3. According to the difference of materials, it is divided into general carbon layout pipe, low alloy layout pipe, high-quality carbon layout pipe, alloy layout pipe, stainless steel pipe, etc.

4. According to special functions, there are boiler pipes, geological pipes, kerosene pipes, etc.

Specification

Five, fluid seamless steel pipe is delineated according to GB/T8163-87

1. Specifications: The outer diameter of the hot-rolled tube is 32-630 mm. The wall thickness is 2.5 to 75 mm. The outer diameter of the cold-rolled (cold-drawn) pipe is 5-200 mm. The wall thickness is 2.5 to 12 mm.

2. Appearance quality: The inside and outside appearance of the steel pipe shall not have cracks, folds, folds, delaminations, hair lines and scars. These shortcomings should be completely eliminated, and the wall thickness and outer diameter should not exceed negative errors after elimination.

3. Both ends of the steel pipe should be cut at right angles, and the burrs should be removed. Steel pipes with wall thickness greater than 20 mm are allowed to be cut by gas cutting and thermal sawing. It is not necessary to cut the head after the negotiation between the supply and demand sides.

4. "Appearance and Quality" of cold-drawn or cold-rolled precision seamless steel pipe refers to GB/3639-83.