Straight seam steel pipe acceptance steps

1. The approval procedure for batch acceptance of straight seam steel pipes should meet the corresponding product standards.
2. Straight seam steel pipes should meet the corresponding product standards, including inspection items, sampling quantity, sampling location and test methods. With the buyer's consent, hot-rolled seamless steel pipes can be sampled in batches according to the number of rolled pipes.
3. If there are items that do not meet the requirements of the product standards, the unqualified items should be selected, and double samples should be taken from the same batch of straight seam steel pipes, and the unqualified products should be reviewed. If the results of the re-inspection do not meet the standards, the batch of straight seam steel pipes shall not leave the factory.
4. Straight seam steel pipes that do not meet the standards (including items that do not meet the standards and are not allowed to be re-checked) should be submitted to the supplier for acceptance at one time, or a new batch of reheat treatment should be accepted (reheat treatment should not exceed two times).
5. If there is no special regulation in the product standard, the chemical composition of the straight seam steel pipe will be accepted according to the melting composition.

What is the difference between straight seam steel pipe and high frequency straight seam steel pipe

Welded steel pipes with only one longitudinal weld are straight welded steel pipes. According to the provisions of GB/9711.1, the diameter of the straight-welded steel pipe is greater than 914.4, and the welding angle is 180°, and there can be two straight-seam steel pipes that are the same.

Straight seam steel pipes can be divided into JCOE straight seam steel pipes and rolled straight seam steel pipes according to the production process.

High-frequency straight seams, submerged arc straight seams, electric welded straight seams, and pipe straight seams are collectively referred to as straight seam steel pipes. The high-frequency straight seam steel pipe adopts the high-frequency current skin effect to produce high temperature and short-term force extrusion at both ends of the steel plate. The wall thickness of the straight seam steel pipe is controlled at about ±0. The end of the 2mm steel pipe meets the American APL standard or GB/T 9711.1 standard. The pipe end is cut and the transportation length is fixed. In recent years, ERW steel pipe has been used as a natural gas pipe network project and a gas company urban pipe network. The main steel pipes have been widely used. At present, the high-frequency straight seam steel pipes with explosives left over from the war account for 60% of the world's steel pipes.

Double-sided submerged arc straight seam steel pipes are also straight seam steel pipes. The submerged arc welded straight welded steel pipe adopts the JCOE cold forming process, the welding seam adopts welding wire, and the granular flux is used for submerged arc. The main production process of submerged arc welded straight seam steel pipe is flexible and can produce any specifications with a wall thickness of 325~1420 mm.To a large extent, it meets the international requirements for the size of steel pipes, and high-frequency straight seam steel pipes are usually used in domestic standard production.

High-frequency straight seam steel pipes are often referred to as original steel pipes. The name of this industry is different from submerged arc welded straight seam steel pipes or thermal expansion high-frequency straight seam steel pipes, and their names are often confused.

The above content is to share with you what is a straight seam steel pipe. I hope that after reading this article, it will be helpful to you. If you want to know more about steel pipes, please contact Shenlong Pipeline. We specialize in the production, processing and sales of various steel pipes and fittings. The main products include seamless steel pipes, straight seam steel pipes, spiral pipes, galvanized steel pipes; elbows, tees, reducers, flanges, etc.
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