D2 corrosion

[pedrof]

We are having some rust issues with D2 steel. It is 58-60 HRC. I was looking at 440C as a possible alternative to this tool steel since it can be hardened.
Are there are major downsides to using this instead?

 

[EdStainless]

You will be able to get RC 57-58, and it does have a little more Cr, so there will be a little corrosion resistance.
But it isn't stainless by any stretch.
What is causing the rusting?
Have you looked at using various anti-rust agents?

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Plymouth Tube

 

[pedrof]

Yes we have, we can go that route but would rather reduce the chances of it occuring.
We suspect it is moisture left from cleaning after manufacturing test and then a long shipping time. We just need a less susceptible alternative to D2, some of the surfaces are aesthetically important. Would another 400 series be a better option?

 

[arunmrao]

There is no assurance that 400 series will not rust. I would suggest better packing techniques during transportation . By changing the alloy, you might be inviting some new problems.

I'm just one step away from being rich, all I need now is money.
( read somewhere on the internet)

 

[Maui]

Take a look at better rust preventative coatings too. Some examples from Daubert can be found in this link:

http://www.daubertchemical.com/brands/noxrust/industry/metalworking

Maui

 

[pedrof]

Thanks for the feedback. I think we are going to investigate the cause further before changing material.
I see the D2 already has a high chromium content so should be fairly good if kept clean and dry.
The only option after that is to try 440C or something like 154CM with extra moly.