I am planning to make a small batch of close tolerance shafts from a 4340 VAR steel.
The shafts will need significant machining on their ends and we plan to stress relieve at 630degC prior to grinding.
Once ground we would like to Plasma Nitride the shafts (400 degC) and use them without...
Oil pumps installed in Porsche 911 engines are simple external gear pumps which operate a dry sump lubrication system.
The pressure pump section produces around 70psi and the scavenge section has around 2 x greater length than pressure section.
These pumps are generally quite long lived and...
I have been offered studs in 17-4PH Double Aged but at H900 +H900.
Will this steel be resistsnt to SCC in this condition? or should I use H1150 + H1150
Thanks
I have read, with interest, that ARP Fasteners will now manufacture 6AL4V Cylinder Head Studs.
I am intrigued by this idea.
ARP also state that they have developed a heat treatment schedule that will allow strenghts of up to 170000psi to be developed.
I can imagine that galling could be an...
I have been looking at the specification for 4340 for some time and the UTS values quoted by most US based suppliers is often quoted at 1800MPa - around 27ksi.
This is much higher than values typically quoted for EN24 (817M40).
The chemistry of the two materials is very similar and I believe...
