Certificates

 

WKZ021-2006     A572Gr50/A709Gr50A572Gr42

1. According to Ⅰgroup steel of heating, Ⅱstage open rolling temperature ≤950 ℃, steel plate finishing temperature ≤880 ℃.

2. Micro alloying steel composition adjustment process points (test)

According to Ⅰgroup steel of heating, Ⅱstage open rolling temperature ≤950 ℃, steel plate finishing temperature≤860 ℃.

15 mm thickness of steel frequency, the temperature of cooling to red is 680 ~ 720 ℃.

3,normalized : 920±10 ℃, heat preservation time 1.8 min/mm.