1. thickness tolerance  +/-0.005mm , width tolerance -0 /+0.5mm , length tolerance -0/+0.5mm 

2. tensile strength and elongation test .

3. earring rate test 

   keep the temperature  190 degree 10 minutes . earring rate can be less than 2% 

4. punching test 

   to test the deep drawing quality ,  there are two punching machines in our lab 

our hot rolled quality sheet could be deep drawing up  to 60mm after two times drawing .