Certificates

WKZ037-2006         A514GrF

1. steel ingot heating according to Ⅱgroup steel executive, highest heating temperature 1260 ℃, 1240 ℃temperature soaking pit.

2. The highest billet heating temperature of 1260 ℃, the temperature of 1200 ~ 1220 ℃soaking pit, total heating time of four to five hours.

3. according to the Ⅱtype controlled rolling, air steel thickness > 2 h, Ⅱstageopen rolling temperature ≤900 ℃, finishing temperature ≤860 ℃.

4. ACC water-cooled return to red temperature 680 ~ 730 ℃.

5, quenching: 930 ±10 ℃, heat preservation time 20 min. According to the current process WH80Q to  execution for cooling.

6 tempering technology is not confirm.