420/D2

[pedrof]

I have an application for a tool where the corrosion resistance of D2 steel is proving a problem.
A hardenable stainless such as 420 should be hard enough and at least let us avoid plating. The environment is industrial, humid and mildly corrosive (China).
A supplier put me on to the crucible 420MQ which is C0.38 Mn0.46 Si0.4 Cr13.6 V0.3 as a good corrosion resistant option.
Only problem is the supplier is in Europe so I need a European steel reference.
I think a 420 would equivalent be fine, does anyone know of a German equivalent?

 

[EdStainless]

Typically these grades are used for molds, even in Europe they go by trade names.
Uddehlom makes Mirrax 40 (and some ESR options for this chem), and other tool steel makes have their versions as well.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[metengr]

http://www.euro-inox.org/pdf/map/Tables_TechnicalProperties_EN.pdf

 

[pedrof]

Thanks for the responses, that's given me something my contact can look into.
I have also heard Stavax may work.

 

[Maui]

You might also want to consider Crucible 154CM. The data sheet can be found here:

http://www.crucible.com/eselector/prodbyapp/stainless/154cms.html

Maui

 

[pedrof]

I'll mention that one too.
Sounds like the easiest one for them to try is going to be Bohler N695 extra or 1.4125.
They are being told locally the heat treatment/hardening reduces the corrosion resistnace but I'm told by other sources if it is tempered correctly this shouldn't knock it down too much.
Also, polished surfaces and passivation can help. I need to check how these steel can be cleaned without damaging them.

 

[EdStainless]

You are correct, the hardening lowers the corrosion resistance because some of the Cr is tied up in the carbides and not available for the bulk corrosion resistance.
Using higher temperature tempers (lower hardness conditions maximizes the corrosion resistance.
Good mechanical finishing (usually after a pickle treatment)followed by passivation is the best course.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube