Most people know that straight seam steel pipes have low production costs and come in various sizes. They are mainly used to transport low-pressure flow gases such as water, steam, and gas. But what should you pay attention to when purchasing straight seam steel pipes? How to close the trap? Not much is known. So, how to judge the quality of straight seam steel pipe products? As a carbon steel pipe manufacturer
with many years of experience in producing straight seam steel pipes, the following three suggestions are given for purchasing straight-seam steel pipes.
1. Thickness measurement of straight seam steel pipe
Straight seam steel pipe is the general name for high-frequency straight seam welded pipe (ERW steel pipe
), submerged arc welded straight seam steel pipe (LSAW steel pipe
) and other categories. With the continuous development and advancement of manufacturing technology, the production and processing processes of steel pipes are increasingly keeping pace with the times. At present, the thickness of straight seam steel pipes is increasing and can directly replace some stainless steel pipes.
Normally, if the wall thickness of a straight-seam steel pipe is required to reach 10mm, the actual produced straight-seam steel pipe will have upper and lower differences, such as 10.2mm or 9.75mm, which are normal deviations. However, in order to make the substandard straight-seam steel pipes look thicker, many unqualified manufacturers will use a hammer to blunt the end of the straight-seam steel pipes to make them look thicker. Therefore, you can use instruments to measure when purchasing straight-seam steel pipes. A look at the thickness of the tube wall can reveal these little tricks.
2. Judgment of the quality of straight seam steel pipes
a. Whether the material is uniform: The raw materials of inferior straight seam steel pipes have too many impurities and uneven materials, resulting in low density of steel and serious deviations in size and weight. Qualified straight-seam steel pipes are made of high-quality materials, with uniform composition and smooth and neat cut surfaces.
b. Whether the strength meets the standard: Inferior straight-seam steel pipes are easy to crack or bend, and can withstand gravity and pressure differences, while high-quality straight-seam steel pipes have high strength, are not easily damaged, and have a long service life.
c. Are there any errors in specifications and weight: Inferior straight-seam steel pipes may have size deviations and substandard weight due to process or human problems, while high-quality straight-seam steel pipes have small errors, are of sufficient weight, and meet the standards.
3. Factory inspection of straight seam steel pipes
Straight seam steel pipes will undergo a number of strict tests before leaving the factory. If one of them does not meet the factory standards, the unqualified straight seam steel pipes need to be picked out and double the number of samples will be taken from the same batch of straight seam steel pipes. , conduct re-inspection of unqualified straight seam steel pipes. If the re-inspection does not meet the standards, the order will not be shipped from the factory.
For example, Permanent Steel's
steel pipes have physical and chemical testing centers and inspection centers. Every straight-seam steel pipe leaving the factory needs to be tested by precision equipment such as hydraulic pressure testing and ultrasonic detection, so as to ensure that all products leaving the factory are qualified straight-seam steel pipes.
It is not easy to choose a good quality straight seam steel pipe that meets the requirements among many straight seam steel pipe manufacturers. First, you must determine your own requirements for the straight seam steel pipe specification, size, and process, and customize a more suitable one according to the scope of use. Straight seam steel pipe; secondly, to learn more about the qualifications of straight seam steel pipe manufacturers, it is best to visit the factory to be more direct.