Thick-walled spiral welded steel pipes are a common steel pipe product with a wide range of uses. They are used in the transportation of steel pipe systems of industries such as petroleum, natural gas, chemical industry, and electric power.
First, the characteristics of thick-walled spiral welded steel pipes
1. Good corrosion resistance: The inner and outer surfaces of thick-walled spiral welded steel pipes are treated with anti-corrosion, which can effectively prevent the steel pipes from being affected by corrosion during use, thereby extending the service life of the steel pipes.
2. High strength and high pressure resistance: Thick-walled spiral welded steel pipes are made of high-quality steel, with high strength and pressure resistance, which can meet the use requirements of various industrial fields.
3. Smooth surface and no defects: The inner and outer surfaces of thick-walled spiral welded steel pipes have undergone high-quality processing, with smooth surfaces and no obvious defects, thus ensuring the safety performance of the steel pipes.
4. Convenient construction and short construction period: Thick-walled spiral welded steel pipes can be welded on site, which is convenient for construction and short construction period, and can effectively improve the progress and efficiency of the project.
Second, the production of thick-walled spiral welded steel pipes
1. Steel plate pretreatment: First, the steel plate is pretreated, including rust removal, oil removal, cleaning, and other processes to ensure the cleanliness and smoothness of the steel plate surface.
2. Rolling: The pretreated steel plate is rolled into a tube, and then the edges are aligned for subsequent welding.
3. Spiral welding: The steel pipe after rolling is spirally welded, usually using submerged arc welding or double-sided submerged arc welding to ensure welding quality.
4. Steel pipe straightening: The welded steel pipe is straightened to ensure the geometric shape and dimensional accuracy of the steel pipe.
5. Dimension verification: The steel pipe is dimensionally verified, including inspections of outer diameter, wall thickness, length, etc., to ensure the quality standards of the steel pipe.
6. Anti-corrosion treatment: The steel pipe is anti-corrosion treated, including spraying anti-corrosion paint, coating anti-corrosion agents, and other processes to improve the corrosion resistance of the steel pipe.
Third, the quality standards of thick-walled spiral welded steel pipes
The quality standards of thick-walled spiral welded steel pipes mainly include the following aspects:
1. Chemical composition: It should meet the chemical composition requirements of relevant standards.
2. Mechanical properties: It should meet the mechanical properties requirements of relevant standards, including tensile strength, yield strength, elongation, and other indicators.
3. Appearance quality: The surface of the steel pipe should be smooth, without cracks, scars, bubbles, and other defects.
4. Dimensional accuracy: The outer diameter, wall thickness, length and other dimensions of the steel pipe should meet the requirements of relevant standards.
Post time: Jun-05-2025