17-4-PH trim material

[arash807]

Can we use SS410 instead of 17-4-PH in a control valve which is installed in steam service?

 

[bao2ye]

What is the temperature of your steam?

 

[arash807]

@ba02ye
360 centigrade.

 

[hsbcn]

And what is the pressure rating? Is this a globe valve?

My focus is on valve stockists in the us and us who supply duplex and super duplex valves, and inconel and hastelloy valves, plus titanium, alloy 20 and 904L valves.

 

[arash807]

Yes this is a globe valve with follow conditions:
inlet pressure=40 barg
operating temperature=410 centigrade
plug material:F6NM+stellite
cage material:17-4-PH
we are going to replace the cage with ss410.is it possible or not?

 

[valvexpert]

While 410 stainless steel has the strength component - it lacks the corrosion resistance properties of 17-4 PH.
17-4 PH would be preferrable over 410 stainless steel.

 

[bingbingwang]

add more to "valveexpert":
you should choose 17-4PH HT1150 hardened cage, which is good for high temperature (410 C deg) erosion-corrosion resistance, and also higher strength at high temperature. the seat ring should be solid cobalt/stellite hardened,if you can make the cage seat surface hardened with alloy6, it would be better. this is a super-heated steam application, the steam can cut the metal quickly if it leaks or operating at low flow condition. 410SST is not very good for this severe process.


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