Large-diameter spiral welded steel pipes are a type of steel pipe that has been widely used in recent years. Their main features are large diameter, high strength, and are suitable for long-distance transportation and transportation of high-pressure media.

First, spiral welding technology of large-diameter spiral welded steel pipes
Large-diameter spiral welded steel pipes use spiral welding technology, which is an efficient, continuous, and automated steel pipe production. Its production is as follows: First, the hot-rolled steel strip or cold-rolled steel strip is rolled into a tube shape, and then the edge of the steel strip is pre-bent, and then the edge of the pre-bent steel strip is pressed to form a circular weld of the steel pipe. Next, the steel pipe is welded through multiple passes to make it a complete spiral welded steel pipe. The advantage of spiral welded steel pipes is that they have high production efficiency and short production cycle, which can quickly meet market demand. At the same time, this can also improve the quality and performance of the steel pipe, so that the product has the characteristics of high strength, high wear resistance, and high pressure resistance. In addition, spiral welding technology can also adapt to a variety of materials and can produce steel pipes of various specifications.

Second, material selection of large-diameter spiral welded steel pipes
For large-diameter spiral welded steel pipes, the choice of materials is crucial. The main materials used are Q235B, Q345B, L245, L290, L360, X42-X80, etc. Among them, Q235B and Q345B are commonly used low-alloy steels with good strength and plasticity and relatively low prices. L245, L290, L360, X42-X80, etc. are high-strength steels used in oil and gas transmission steel pipes, which have good wear resistance, corrosion resistance, and pressure resistance. In terms of material selection, the use environment and customer needs of the steel pipe must also be considered to select suitable materials. At the same time, production also requires quality control of materials to ensure that the quality and performance of the steel pipe meet standards and customer requirements.

Third, the product features of large-diameter spiral welded steel pipes
1. Large diameter: The diameter of large-diameter spiral welded steel pipes is generally above 219mm and can reach more than 3000mm. This large-diameter steel pipe can meet the requirements of industries such as petroleum, natural gas, water conservancy, and chemical industry for large amounts of conveying media and long conveying distances.
2. High strength: The material used in large-diameter spiral welded steel pipes has high strength and can withstand greater pressure and bending force. Its strength and rigidity are also higher than other steel pipes, and it can be used in complex geological environments.
3. Wear and corrosion resistance: The material of large-diameter spiral welded steel pipes has been specially treated to have good wear resistance and corrosion resistance. This feature enables it to maintain a longer service life when conveying media such as oil and gas.