Certificates

 

WKZ005-2006        AISI 4140

1. Send, WenQing, temperature ingot temperature loading.

2.steel ingot simmer for 1 hour steel, when under 1000 ℃, the rate of temperature rise is≤100℃,  and the highest heating temperature is 1260 ℃ ,Heat preservation time

According to  Ⅱgroup steel’s provisions

3. finishing temperature≤950℃

4,air cold after rolled

5.tempering technology:620±10℃.Heat preservation time 3.5min/mm

Annealing technology:650±10℃，Heat preservation time≥20h,cooled down to 350℃air cold out.