Sometimes why there is inconsistency in thickness between the same batch of 304 stainless steel strips? Today I will tell you the reasons for the inconsistent thickness of 304 stainless steel strips, hoping to clarify your doubts.
1. The influence of temperature change:
Once the temperature of metallurgical spare parts changes, it will affect the production conditions of the steel rolling equipment, thereby driving the thickness of the stainless steel strip to change. The essence is that the temperature difference causes the thickness to fluctuate. Resulting in a change in the thickness between the stainless steel strips.
2. Effect of tension change:
The tension will affect the stress state, and can change the metal deformation resistance of the stainless steel strip, and further cause the thickness of the stainless steel strip to change. In addition to affecting the thickness of the head and tail of the stainless steel strip, the change of tension will also affect the thickness of other parts of the stainless steel strip.
Once the tension is too large, not only the thickness of the stainless steel strip will be affected, but also the width of the stainless steel strip will be affected. Therefore, during the hot rolling process, manufacturers often use loopers to stabilize the tension; similarly, cold rolling is required during the cold rolling process, because the stainless steel strip will be hardened during processing, which will reduce the deformation resistance. Big.
If you just adjust the roll gap of the rolling equipment to change the rolling force, it is difficult to obtain a suitable reduction rate, so it is necessary to use a relatively large inter-stand tension for rolling. In cold rolling production, large tension is necessary .
By reducing the rolling force, the energy consumption of rolling can be reduced, thereby avoiding deviation of the stainless steel strip, and controlling the thickness and deformation of the stainless steel strip well.
3. Effect of speed change:
The so-called speed mainly refers to changing the rolling pressure and reduction through the adjustment of friction factor, deformation resistance and bearing oil film thickness, thereby changing the thickness of the stainless steel strip.
4. The influence of roll gap change:
During the rolling process of stainless steel strip, because the rolls and bearings of the rolling mill components are affected by factors such as thermal expansion, roll gap wear, and roll eccentricity, the roll gap of the rolling equipment will produce high-frequency periodic thickness during high-speed rolling. Fluctuations directly affect the thickness of the stainless steel strip.
In addition to the above reasons, the fluctuation of incoming material thickness and mechanical properties is also caused by the change of rolling pressure to cause inconsistent thickness of steel strip. In addition, the calculation deviation of the rolling equipment setting, the accuracy of the measuring instrument, the design of the control system structure and control parameters, etc. will also affect the thickness accuracy of the stainless steel strip.
