Thick-walled steel pipes refer to steel pipes with a ratio of outer diameter to wall thickness of less than 20. They are mainly used as petroleum geological drilling pipes, cracking pipes for petrochemicals, boiler pipes, bearing pipes, and high-precision structural pipes for automobiles, tractors, and aviation.
The biggest difference between thick-walled steel pipes and thin-walled steel pipes lies in the thickness of the steel pipe wall. Generally speaking, thin-walled steel pipes are cold-drawn, and thick-walled steel pipes are generally hot-rolled. If the measurement unit is used to distinguish, then it is generally believed that the wall thickness/pipe diameter equal to 0.02 is the watershed between thick-walled steel pipes and thin-walled steel pipes. The wall thickness/pipe diameter is less than 0.02 for thin-walled steel pipes and greater than 0.02 for thick-walled steel pipes. In terms of use, thin-walled steel pipes are mostly used for pipelines. Thick-walled steel pipes are mostly used for blanks of hollow parts. Pressure-bearing and important pipelines.
Thick-walled steel pipes are mainly used in water supply projects, the petrochemical industry, the chemical industry, the power industry, agricultural irrigation, and urban construction. For liquid transportation: water supply and drainage. For gas transportation: coal gas, steam, liquefied petroleum gas. For structural use: as piling pipes, bridges; docks, roads, building structure pipes, etc.
Phenomena of fake and inferior thick-walled steel pipes:
1. Fake and inferior thick-walled steel pipes are prone to folding.
2. The surface of fake and inferior thick-walled steel pipes often has pockmarks.
3. The surface of fake and inferior thick-walled steel pipes is prone to scarring.
4. The surface of fake and inferior materials is prone to cracks.
5. Fake and inferior thick-walled steel pipes are easily scratched.
6. Fake and inferior thick-walled steel pipes have no metallic luster and are light red or similar to pig iron.
7. The transverse ribs of fake and inferior thick-walled steel pipes are thin and low, and they often appear to be incomplete.
8. The cross section of fake and inferior thick-walled steel pipes is elliptical.
10. The material of fake thick-walled steel pipe contains many impurities and the density of steel is relatively low.
11. The inner diameter of fake thick-walled steel pipe fluctuates greatly.
12. The trademarks and printing of steel pipes are relatively standardized.
13. For large threads of three steel pipes with a diameter of more than 16, the spacing between the two trademarks is more than IM.
14. The longitudinal reinforcement of fake steel threaded steel is often wavy.
15. The fake thick-walled steel pipe manufacturer does not have a crane, so the packaging is loose. The side is oval.
Thick-walled steel pipe production steps:
1. Stainless steel elbows change the wall thickness of thick-walled steel pipes, and change the wall thickness along the length of the pipe;
2. Process the cross section of the square pipe, and change the circular cross section into a square, oval, or polygonal shape;
3. Square pipes with curling and bottom sealing, increase the total strength of the pipe end by curling the pipe to the outside or inside of the pipe or sealing the end of the square pipe;
4. Stainless steel elbows change the diameter of the square pipe, which means that the diameter of the pipe end or a part of the pipe is reduced;
5. Stainless steel elbows bend square pipes, which are more contact, that is, to change the straight pipe into a bend with different curvature radii, such as elbows, elbows, etc.;
6. Square pipes with flanges and round edges, the former refers to the end of the pipe convex to the inside or outside, and the latter refers to the square pipe with a bulge or groove formed in the circumferential direction of the pipe.
Post time: Dec-27-2024