Among the common problems of seamless steel pipes, wall thickness difference (eccentricity) occupies the first place. Wall thickness difference, as the name implies, is the difference between the maximum wall thickness and the minimum wall thickness. As long as it is a seamless steel pipe, there will be wall thickness deviation, but how much can this deviation be controlled?
1. Wall thickness deviation specified by national standards
What is the general allowable deviation of seamless steel pipe wall thickness? According to national standards: GB/T8162-2008 National Standard for Seamless Steel Pipes for Structures
Q: What is the allowable deviation of 25*5 seamless steel pipe wall thickness?
A: The wall thickness S is 5mm, corresponding to the allowable deviation range of >3~10 -10%S to +12.5%S, then the allowable deviation of 25*5 seamless steel pipe wall thickness is -0.5~+0.625mm.
2. The impact of uneven wall thickness of seamless steel pipes
In some mechanical processing applications, the wall thickness deviation of seamless steel pipes is a very important indicator. If the wall thickness deviation is too large, a larger margin will be required, which will waste materials and increase costs. It will be difficult to accept orders and will not be competitive in the market.
3. How to control the wall thickness deviation of steel pipes and help customers save costs
(1) The source of steel pipe production—perforation
- We have sophisticated perforation equipment (extended type). The furnace length is equipped with preheating, heating, and high-temperature zones. Natural gas nozzles are used throughout the process to ensure uniform temperature and ensure the quality of perforation.
- We use high-quality alloy plugs to ensure better and more stable perforation quality.
- We keep sampling records throughout the perforation process and inspect each tube after perforation to ensure the quality of the tube.
- For general small steel pipe factories (processing workshops), perforated tubes are generally purchased from outside, and the quality of the tubes cannot be controlled and guaranteed from the source.
(2) Experience in steel pipe production, mature and stable process.
Thick-walled steel pipes are special products of steel pipes, especially various carbon steel and alloy thick-walled steel pipes, with specifications such as 32*12 (wall thickness), and 20*8 (wall thickness).
The steel pipe has two processes: cold drawing and cold rolling. The wall thickness deviation, precision, and performance of seamless steel pipes can be customized according to customer product requirements, helping customers save costs and have cost-effective products.
Post time: Oct-29-2024