Certificates

 

WKZ031-2005         A572Gr50

1. The ingot, billet all According to Ⅱgroup steel heating

2.adopt the Ⅱtype controlled rolling, the Ⅱstage open rolling temperature≤920℃, finishing temperature ≤880 ℃.

3. The temperature after rolling steel cooling to red:≤700℃。

4, normalized technology:

  normalizing  furnace:900±10℃.totally heating time:≥1.6min/mm       

Outside machine furnace, car bottom furnace:900±10℃ 

Heat preservation time1.5min/mm