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 .