Galvanizing GB/T3091-2015 Steel Pipes

Galvanizing GB/T3091-2015 Steel Pipes

1. Raw materials

Spiral steel pipes that implement the standard GB/T3091-2015 use high-quality strip steel as raw materials, and their quality should comply with relevant national standards. After the strip steel is leveled, sheared, formed, welded, anti-corrosion and other processes, it is made into qualified spiral steel pipe. Among them, welding is one of the key links. Advanced welding technology and equipment are used to ensure welding quality and smooth welding seams.

2. Manufacturing process

The manufacturing process of spiral steel pipe mainly includes the following steps:

1. Strip leveling: Send the strip to the leveling machine for leveling to eliminate unevenness and distortion on the surface of the strip.

2. Strip cutting: Cut the leveled strip to the required length.

3. Forming: The cut strip steel is fed into the forming machine, and through processes such as bending and extrusion, it is made into a spiral-shaped steel pipe.

4. Welding: The formed steel pipe is fed into the welding machine, and advanced welding technology and equipment are used for automatic or semi-automatic welding.

5. Anti-corrosion: Perform anti-corrosion treatment on the welded spiral steel pipe to increase its service life.

3. Quality inspection

During the manufacturing process and finished product inspection stage, a series of quality inspections are required to ensure the quality and reliability of spiral steel pipes. Quality inspection mainly includes the following aspects:

1. Dimensional inspection: Check whether the outer diameter, wall thickness, length and other dimensions of the spiral steel pipe meet the standard requirements.

2. Surface quality inspection: Check whether the surface of the spiral steel pipe is flat and smooth, and whether there are cracks, pores and other defects.

3. Welding quality inspection: Check the quality of the welding seam, including the flatness of the welding seam, welding slag cleaning, etc.

4. Mechanical performance inspection: Conduct tension, compression, bending and other tests on the spiral steel pipe to check whether its mechanical properties meet the requirements.

5. Non-destructive testing: Use non-destructive testing methods such as ultrasonic flaw detection and radiographic flaw detection to detect internal defects in spiral steel pipes.

4. Application areas

Spiral steel pipes that implement the standard GB/T3091-2015 are widely used in the following fields:

1. Petroleum and chemical industry: used to transport corrosive media such as oil and natural gas, as well as chemical substances such as acid, alkali and salt.

2. Electric power industry: used to transport high-temperature, high-pressure steam or water and other fluids.

3. Water conservancy industry: used to transport clean water, sewage and other fluids, and as pipeline materials for hydropower plants.

4. Municipal engineering: used for the construction and maintenance of municipal facilities such as urban water supply pipe networks and sewage treatment plants.

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