1. Classified by type: straight seam steel pipe, seamless spliced steel pipe, spiral steel pipe, etc.
2. Classification of cross-sectional shapes of straight seam steel pipes: square steel pipes, stainless steel round pipes, flat stainless steel round pipes, rectangular square pipes, semi-circular pipes, etc.
Straight seam steel pipe product quality inspection
The general standard for straight seam steel pipe is GB/T 3091-2008. If it is used as a structural (column, etc.) standard, it can be carried out. However, if it is used as drum production and pressure equipment for heating furnaces and gas pipelines, the standard has lower requirements for the ovality, parallelism, and welds of straight seam steel pipes.
The requirements for the production and processing of straight seam steel pipes are much higher than the requirements for the construction of straight seam steel pipes. Straight seam steel pipes for transporting fluids can be divided into straight seam steel pipes for general fluid transportation and straight seam steel pipes for pressure resistance (in fact, there are many kinds of fluid pipelines, which are classified only according to their ability to withstand). The inspection standards for low-pressure fluid transport steel pipes can be carried out by GB/T 3091-2008; the T 9711.2 standard is produced/implemented by the pressure vertical GB/T 3087 or API or GB very high standards. There are so many norms involved.
Several aspects need to be paid attention to: At the beginning of the steel pipe industry, there were many tricks to deceive people, but now we are more proficient in this field, so we can identify these tricks with our own hands.
1. If the wall thickness is insufficient, the steel pipe end with the hammer shield will appear thicker, but instrument measurements will show the original appearance.
2. Use a straight seam as a seamless splicing steel pipe. The seam between the straight seam and the longitudinal split weld is less than 1. Use equipment to polish the entire steel pipe, which is generally called polishing. It will appear that there are no gaps and no gaps. The effect of seam splicing.
3. Nowadays, there is a more complicated way to seamlessly splice steel pipes. Seamless spliced steel pipes are thermally deformed pipes. After expansion, there is a lead powder inside and different weld ignition marks on the outside. We cannot see it at the same time.
4. Grinding and polishing of circular electric welded straight seam steel pipes means seamless splicing of steel pipes and straight seam steel pipes.
Generally speaking, when purchasing straight seam steel pipes, you must conduct comprehensive research on the raw materials, specifications, thickness, solid solution treatment, non-destructive testing technology, etc. of straight seam steel pipes. It is best to use straight seam steel pipes produced by reliable manufacturers. Steel Pipe.
Post time: Feb-22-2024