Certificates

 

WKZ067-2005   “05exit -64”contract  S460N

1. steel ingot should Send, cleaning and packing in normal temperature

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 220mm.in the Ⅱstage the open rolling temperature ≤920℃,finishing temperature≤900℃

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

normalized 910℃,heat preservation time 1.8min/mm