Some Common Knowledge About Large-Diameter Anti-Corrosion Spiral Steel Pipes
Release time:
2020-10-20
Currently, there are two main types of anti-corrosion treatments for large-diameter, anti-corrosion steel pipes made using spiral welding: one is internal wall corrosion protection, and the other is external wall corrosion protection. The Ministry-level standard and the National standard are currently the two most commonly used standards for spiral welded pipes; however, the National standard is stricter than the Ministry-level standard in terms of both thickness and inspection requirements. 1. Thickness of large-diameter, anti-corrosion steel pipes made using spiral welding: The thickness specified by the National standard differs from that specified by the Ministry-level standard. According to the National standard, the allowable deviation in thickness is within 0.5 millimeters, whereas the Ministry-level standard allows a deviation of up to 1 millimeter. 2. Inspection of spiral welded pipes used in large-diameter, anti-corrosion steel pipes: All National standards adopt...
Currently, there are two main types of anti-corrosion treatments for large-diameter, anti-corrosion steel pipes made using spiral welding: one is internal wall corrosion protection, and the other is external wall corrosion protection.
The Ministry Standard and the National Standard are currently the two commonly used standards for spiral steel pipes; however, the National Standard is superior to the Ministry Standard in terms of both thickness and inspection requirements.
1. Spiral steel pipe for large-diameter anti-corrosion steel pipes Thickness: The thickness specified by the national standard differs from the thickness specified by fabric standards. The allowable tolerance range for the national standard's thickness is: 0.5 Within millimeters, the allowable range for the standard deviation of fabric is 1 Within millimeters
2. Spiral steel pipes in large-diameter anti-corrosion steel pipes Inspection: All national standards employ ultrasonic testing, while fabric labels are subject to sampling inspection.
3 Exterior wall anti-corrosion
There are various types of exterior wall corrosion protection, with the common ones being: 3PE Anti-corrosion, coal tar epoxy asphalt anti-corrosion, and epoxy resin anti-corrosion. 3PE Anti-corrosion is currently quite common. 3PE Currently, anti-corrosion spiral steel pipes offer relatively good corrosion protection, but they come at a higher price. While epoxy coal tar coatings are typically used in the oil and gas industry, they are more commonly applied in the water pipeline sector due to their relatively lower cost.
4 Internal wall corrosion protection
Internal wall corrosion protection mainly includes: IPN8710 Anti-corrosion and cement mortar anti-corrosion. IPN8710 Anti-corrosion is primarily used in the potable water pipeline industry, while cement mortar anti-corrosion is mainly used in the sewage pipeline industry.
The raw materials for spiral steel pipes are strip steel or coil plates, both of which are hot-rolled sheets.
Hot-rolled sheet—also known as hot-rolled steel plate or steel strip—is commonly referred to as "zha," such as "hot-rolled sheet." However, all these terms refer to the same hot-rolled sheet. It refers to a material with a width of 150 mm or greater. 600 Millimeters, with a thickness of 0.35–200 Millimeter-thick steel plates and a thickness of 1.2-25 Millimeter-thick steel strip. Cold-rolled steel sheets are produced from hot-rolled coils at room temperature and below the recrystallization temperature.
The difference between hot-rolled and cold-rolled steel sheets:
Hot-rolled steel plates are categorized into structural steel, low-carbon steel, and welding bottle steel. Then, depending on the specific type of steel required, you can identify the appropriate material and check its density and chemical composition.
Hot-rolled steel plates have low hardness, are easy to process, and exhibit good ductility.
Cold-rolled steel sheets have high hardness and high relative strength in terms of machinability.
Recommended News
Advantages of anti-corrosion steel pipes
2022-09-19
What is TPEP anti-corrosion steel pipe?
2022-09-07
Let’s take stock of TPEP’s major advantages!
2022-08-18
Shisheng Tube-material Antiseptic
HOT LINE::
ADDRESS:
Puwacheng Industrial Development Zone,
Yanshan County, Hebei Province