Certificates

 

WKZ007-2006        P460NH/NL1

Perform technical conditions: WJX048-2005

1. Send, WenQing, temperature ingot temperature loading.

2.before steel ingot set up soaking pit furnace should air furnace more than 30 minutes.Simmer for 1 hour steel ingot, when below1000℃,the  temperature rise rate is120℃/h, the highest heating temperature is 1250 ℃,the total heating time extended 1hour on the basis ofⅡsteel group

3.adopt theⅡgroup control rolling. Air steel thickness ≥300mmwhen thick plate is 200-180mm. Air steel thickness ≥260mmwhen thick plate is 170-150mm .in the Ⅱstage the open rolling temperature ≤920℃,finishing temperature≤900℃

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

5.normalized technology910±10℃,heat preservation time 1.8min/mm