1. diversity of size 2. F316, F51,35CrMo, 36CrNiMo4 and so on 3. Heat treatment 4. detailed record cards of process 1. A105 Q235 Forged Carbon Steel Flange 2. Material:CS 3. Size:1/2"-48" 4. Pressure:150#-2500# 5. Certificate:ISO9001:20081. A105 Q235 Forged Carbon Steel Flange2. Material:Carbon Steel Material: A105 A105N A106 Q235 etc.3. Standard:GB,JIS,BS,DIN.ANSI/ASTM /API,NF,GOST,EN,ISO and ...