LSAW steel pipes are mainly used in the power industry, agricultural irrigation, water supply engineering, chemical industry, and urban construction. It is a steel pipe with a weld parallel to the longitudinal direction of the steel pipe. Its production technology is simple, the production efficiency is high, the application field is wide, the cost is low, and the development is relatively fast. So what should we pay attention to when purchasing LSAW steel pipes?
What should I do before purchasing steel pipes?
1. Purchase needs to understand the types of steel pipes
According to the type: straight seam steel pipe, spiral steel pipe,
seamless steel pipe, etc.; straight seam steel pipe cross-sectional shape classification: elliptical pipe, square pipe, rectangular pipe, flat elliptical pipe, semicircular pipe, etc.
2. Quality inspection of straight seam steel pipes
The standard for ordinary straight seam steel is GB/T3091-2008. If it is used for structural purposes (columns and other types of applications), this standard can be completed. However, if it is used for roller production, pressure equipment is used in boilers, oil and gas pipelines, this standard has a bit low requirements for the ellipticity, straightness and welds of straight seam steel pipes.
The requirements for processing straight seam welded pipes are much higher than those for structural straight seam welded pipes. Straight seam steel pipes for fluid transportation can be divided into straight seam steel pipes for ordinary fluid transportation and straight seam welded pipes for pressure.
The pressure longitudinal GB/T3087 or API or GB produces/implements T9711.2 standards; the inspection standards for steel pipes for low-pressure fluid transportation can be implemented according to GB/T3091-2008, which are very high standards.
What should you pay attention to when purchasing LSAW steel pipes?
At the beginning of the steel pipe industry, there were many tricks to deceive people, but now people are more proficient in this industry, so now we can easily identify these tricks.
1. If the wall thickness is not enough, the mouth of the steel pipe will look thicker with a hammer shield, but it will be exposed when measured with an instrument.
2. Use the straight seam as a seamless steel pipe, and use a machine to polish the steel pipe as a whole, commonly known as polishing, to act as seamless as if there is no gap, because there are fewer welds in the straight seam and only one longitudinal analysis weld.
3. Now there is a more complicated method, which is seamless steel pipe. Seamless steel pipe is a heat expansion pipe. After expansion, there is lead powder inside, and there are different burning marks on the outside. The weld is also invisible to us. The girth welded straight seam steel pipe uses polishing to indicate seamless steel pipe and straight seam steel pipe.
In summary, when purchasing straight seam steel pipes, it is necessary to conduct a comprehensive investigation from various aspects such as steel pipe size, thickness, material, solution treatment, non-destructive testing, etc. It is best to choose straight seam steel pipes produced by regular manufacturers.
The above is the relevant content about straight seam steel pipes shared with you. I hope that through the above content, you can have a further understanding of straight seam steel pipes.
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