We need a tough high yeild material approx 10" dia for some tooling. 17/4 ph was used previously but has had some failures.
4330V has been proposed but we think we might need to treat it post machining to increase wear/corrosion resitance. EG Gas Nitriding and steam tempering (oxidising)
What concerns me is that these treatments are carried out at temps are in the range of the tempering temperature.
EG Tata have offered us
ASTM E4330V 260mm dia
Normalise at 910c for 6 hrs air cool
Harden at 880c for 6 hrs Water quench
Temper at 590c for 12 hrs Air cool
Stress Relieve at 520 for 11 hrs Air cool
Giving 1100MPA Ys (162KSI)
-50 Charpy of 45
The Gas nitriding is at 460-560 for long times.
Steam tempering is 450-500 Not sure about the times yet.
Concern....
4330V has been proposed but we think we might need to treat it post machining to increase wear/corrosion resitance. EG Gas Nitriding and steam tempering (oxidising)
What concerns me is that these treatments are carried out at temps are in the range of the tempering temperature.
EG Tata have offered us
ASTM E4330V 260mm dia
Normalise at 910c for 6 hrs air cool
Harden at 880c for 6 hrs Water quench
Temper at 590c for 12 hrs Air cool
Stress Relieve at 520 for 11 hrs Air cool
Giving 1100MPA Ys (162KSI)
-50 Charpy of 45
The Gas nitriding is at 460-560 for long times.
Steam tempering is 450-500 Not sure about the times yet.
Concern....