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Spiral steel pipe is a type of steel pipe specifically used for transporting chemical media. It is made of low-carbon steel or low-alloy steel strip and manufactured through spiral forming and submerged arc welding processes. It has high strength, corrosion resistance, and sealing properties, and is suitable for the transmission needs of corrosive media such as acids, alkalis, and salts.
keyword Chemical transportation pipeline steel pipe Category Scene photos Related products Get a quoteDefinition and core characteristics of spiral steel pipes for chemical transportation pipelines
Spiral steel pipe is a type of steel pipe specifically used for transporting chemical media. It is made of low-carbon steel or low-alloy steel strip and manufactured through spiral forming and submerged arc welding processes. It has high strength, corrosion resistance, and sealing properties, and is suitable for the transmission needs of corrosive media such as acids, alkalis, and salts.
1、 Technical characteristics and manufacturing processes
Materials and Forming Technology
Raw material selection: Low carbon steel (such as Q235B) or low alloy steel (such as X60M) is used, and the strip steel needs to be pre treated with leveling, trimming, and planing to ensure surface smoothness and dimensional accuracy.
Spiral welding: The pipe blank is rolled using external/internal control roll forming technology, and single or double wire submerged arc welding (such as Lincoln welding machine in the United States) is used to complete the internal and external double-sided welding. The weld gap is strictly controlled within 1-3mm to ensure sealing and compressive strength.
Anti corrosion treatment
Multi layer anti-corrosion technology: In response to the strong corrosiveness of chemical media, 3PE process (epoxy powder+adhesive+polyethylene) or hot-dip galvanizing treatment is adopted to significantly improve acid and alkali resistance and chemical corrosion resistance.
Surface treatment: Sandblasting rust removal, acid cleaning and other processes ensure the adhesion of anti-corrosion coatings, extending the service life of pipelines by 5-10 years.
Performance advantages
Pressure resistance: Spiral welds disperse stress, with a pressure bearing capacity 30% higher than straight seam pipes, and can withstand a maximum pressure of 20MPa.
Temperature resistance: Supports working conditions from -40 ℃ to 150 ℃, suitable for high-temperature reactions or low-temperature storage needs in chemical production.
Economy: Producing large-diameter pipes (such as DN1600) with narrowband steel reduces material costs by 20% and maintenance costs are low.
2、 Application scenarios and quality control
Application in the field of chemical engineering
Corrosive medium transportation: long-distance transportation of highly corrosive fluids such as sulfuric acid, hydrochloric acid, liquid alkali, etc.
Pharmaceutical and food industries: The transportation of high-purity chemical reagents or food grade media must meet hygiene standards and pollution prevention requirements.
Industrial wastewater treatment: Used for wastewater discharge pipelines containing heavy metals and organic solvents, it needs to have both corrosion resistance and leakage resistance.
Quality Control Standards
Non destructive testing: 100% coverage of welds through ultrasonic testing, automatic defect alarm and marking, manual re inspection to eliminate hidden dangers.
Pressure test: Each steel pipe undergoes a computer-controlled hydrostatic pressure test, with pressure parameters automatically recorded and printed for archiving.
Standard specifications: Follow GB/T 9711 (Petroleum and Natural Gas Industry Transmission Steel Pipe) and specialized anti-corrosion standards for the chemical industry.
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