Quick Question about PVD Coatings

[AKdan]

Hi,

I am looking at having a 4140 Remington receiver and PTG bolt coated with a PVD (TiN derivation) Coating. The coater told me that the application temperature is typically 700 deg F. From What I have researched this should not effect the internal hardness of the Remington action or Bolt as they are tempered at a higher temperature. Does anyone have any better insight. The main purpose is to provide a hard corrosion prohibitive surface in for wear faces and in the nooks and crannys. I am familiarizing myself with tempering of 4140 steels and the subsequent Rc Values, but want to be 100% certain prior to having this done.

Thanks,

Dan

 

[Bullet bumper]

As far as I can tell you need to be careful , This article says , " PVD is preferred for steel parts because the deposition temperatures exceeds the austenitizing temperature of steel. https://en.wikipedia.org/wiki/Titanium_nitride
The temp for austenitizing steel is 727 Celcius not Fahrenheit . That's 1340 F https://en.wikipedia.org/wiki/Austenite
I'm no expert on this but something seems amiss with just some casual research .
You need to look more closely at it before you jump in . The coater may have his temp scales mixed up .