AISI 410 Vs 420

[shaff]

Hello,

Can we use AISI 420+stellite instead of AISI 410+stellite? This is for valve trim materials (Disc, Stem, Wedge, seat rings etc)

Preliminary search on this says that they are same material with different strengths.
420 has higher carbon content. Corrosion resistance is same for both.

Can we put AISI420 for AISI410 requirement for moderate temperature pressure applications? (20 bar pressure and 85deg design temperature)

Many Thanks

 

[hsbcn]

There are some minor differences between AISI 410 and 420; 420, for example, has a higher tensile strength, has less Manganese but more Chromium content, so they will respond slightly differently in corrosive conditions.

Facts aside, the real question is: why do you want to use 420 instead of 410? Are you concerned that the 410 can't handle the process (heat/corrosion issues?) If so, would it make more sense to go for an alloy, for example do an inconel, monel or tungsten carbide overlay?

The question "better" is always best asked in a given context, because in oil and gas, "better" simply doesn't exist outside of a process context. Is a Masserati "better" than a tractor; in sunny Barcelona, there's no doubt, but if the "process" is ploughing a field, I'd rather be sitting in a tractor, big wheels and noisy engine included!

=)

I work with valves in exotic alloys at The Alloy Valve Stockist. This is our blog, and this is me on Twitter and LinkedIn. Let's connect!