High Temperature Pump Body Material
High Temperature Pump Body Material
(OP)
For a heat recovery pump, where the temperature is expected t rise around 800 C, we use stainless steel 316 casting for pumps body. Are there any better material such a ss310 casting that can be used?





RE: High Temperature Pump Body Material
Why are you asking if there is a better material? Have you had problems from leaks caused by creep deformation?
RE: High Temperature Pump Body Material
RE: High Temperature Pump Body Material
If this distortion is a chronic problem it could be that you need to thicken the case to reduce service stresses. The 316 ss exhibits oxidation resistance for high temperature use, but creep strength is another matter. Can you check the carbon content of the casting? It should meet the specification below for starters
ASTM A 351 either Grade CF-8M 0.08% C max, or it could be a CF-12M (316 ss) with higher carbon to 0.12%. I would hop your carbon content is close to 0.08%.
RE: High Temperature Pump Body Material
RE: High Temperature Pump Body Material
Yes, you can have cast versions of 310 ss. There are cast versions of high temperature - heat resistant stainless steels like HH, HK, and so on.
RE: High Temperature Pump Body Material
I have made some pump parts in HU too. Today I have an enquiry for HV castings.
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RE: High Temperature Pump Body Material
RE: High Temperature Pump Body Material
I would lean toward the HU grade. This is cast 825, with higher carbon for high temp strength. If you need to weld on it then use the CU lower carbon version. Even that one will have a lot higher strength than your 316.
RE: High Temperature Pump Body Material
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RE: High Temperature Pump Body Material
When you want some corrosion resistance and high temp strength there are not a lot of good options. The other nice thing is that at ~40% Ni this alloy has pretty good CSCC resistance to go along with its strength and phase stability.