Difference Between AISI 410 AND SA-182

AISI 410 is a martensitic SS grade with 12-13%Cr and no Ni content. 316 SS is an austenitic one and softer than 410 type. Both are used for valve internals (trim).

If you ask for the sealing surfaces of seat, 410 type is better because is more abrasion resistant (harder) and the seat surface will last longer.

AISI 410 is covered by SA-182 standard too, but is the grade F6a (UNS S41000)

Kind regards

Thank you KWEST

I couldn´t see in this way the characteristic about 410 in my specfification, nevertheles whit your comment i can take a decision about the better material to specify in procedures and requisitions.

but what do you think about the abrasion at valve used to gas process because i have some valve adquired to this services whit trims made whit 316 ss

best regards

Gabriel

I think it was check valves, isn't it? Gas service don't use to be classified as "abrasive". The only case in which I wouldn't use 316 is for seating material in valves which need to be hard seated (high torque/thrust applied to stem) like gate or globe valves, because the greater tendency of 316 to galling.

Kind regards

Kwest

You are right. the valve that i have are check valve. and i think that you have reason.

i am thinking that is very important stablish oneself some considerations before specify or determinate a material to trims in valves.

1.- Hard seated is required?

2.-The process is considered whit abrassion properties?

I believe that after do this question we can see in a better way or clearly the better option to specify a material to trims.

What do you think?

Austenitic stainless steels (316 for example) are prone to galling if two surfaces have to slide under pressure.This is not common in check valves (at least on tilting disc type. For stop-check valves I wouldn't recommend a SS).

For Gate valves, in which a sliding motion between disc and seat occurs during closing and high lateral forces can be applied if the valve is differential pressure (flow) stroked, for this sliding seating surfaces you need a hardest material and less prone to galling. AISI 410 type is a martensitic stainless steel commonly used in valve trim. For higher strength Cobalt based alloys (Stellite 6 type) is also used.

Kind regards