The guaranteed method of the wall thickness accuracy of the straight seam steel pipe
1. Tube billet heating
The heating should be even, and the rapid rise and fall of the temperature should be avoided. The temperature of each rise and fall should be steady and slow, and the temperature of the rise and fall should not exceed 30°C.
2. Rolling mill mandrel
Thick-walled pipes and solid blanks with average wall thickness greatly reduce the probability of bending deformation of the mandrel, which can effectively improve the wall thickness accuracy of the steel pipe.
3. The accuracy of the mandrel
The outer machining accuracy of the mandrel is controlled within ±0.1mm, and the straightness deviation of the mandrel does not exceed 5mm. During welding, a precision-machined pin is inserted between the two core rods for positioning to avoid excessively large total straightness formed by welding.
Determine whether the centering roller device is in place, adjust the center of the relevant core-holding roller, the opening angle and the size of the opening teeth of each action, and the center of the core-holding roller must be on the rolling line
5. Centering roller
Technology, to avoid the occurrence of central thinning and wall thickness increase, and the situation of Haou surpassing the limitation of restraint, and improve the accuracy of wall thickness.
Here are some methods of the straight seam steel pipe wall thickness accuracy. To help you to slove this problem during the steel pipe manufacturing.