Certificates

WKZ038-2005      St52-3N、St52-3U

1. The ingot, billetall according to Ⅱgroup steel heating, adopt the Ⅱtype controlled rolling,  finishing rolling temperature ≤880 ℃.

2.normalized temperature: 910±10℃, normalizing furnace’s total heating time > 1.5 min/mm,

3 the heat preservation time of  outside machine furnace and car bottom furnace:  1.6 min/mm