Certificates

 

WKZ072-2005         Q345E-Z25

1. ingot according to Ⅱgroup steel heating, adopt the Ⅱtype controlled rolling, Ⅰstage low-speed under pressure, air steel thickness > 1.6 h, Ⅱstage finishing temperature ≤920 ℃, finishing temperature ≤900 ℃.

2. after rolled steel plate stacking slow cold for 24 hours.

3. normalized, must be in the normalizing furnace, the machine often furnace processing, not allow underneath the car furnace processing.

Normalized technology:910±10℃, the total heating time ≥1.5 min/mm,

Heat preservation time of outside furnace≥1.5 min/mm