Certificates

 

WKZ074-2005             Q420D、Q460E

1. Q460E ingot temperature, temperature WenQing send, outfit.

2. Q420D, Q460E ingot according to Ⅱgroup in steel heating, and simmer for 1 hour steel, when under 1000 ℃, the rate of temperature rise is 120℃/h, for Q460E steel ingot, soaking pit furnace must air furnace more than 30 minutes before put steel. and the highest Q460E heating temperature is not more than 1250 ℃for Q460E.

3. adopt The Ⅱtype controlled rolling, the first Ⅱstage accumulative total pressure as close as possible rate 50%, the first Ⅱstage opening rolled temperature ≤920 ℃, than finishing temperature ≤880 ℃.

4. after rolled  use the ACC water-cooled, the temperature of steel cooling to red is 650-700℃

2 # normalizing furnace: 900±10 ℃, total heating time 2 min/mm, the temperature of steel cooling to red is 640-680℃