casing materials for steam turbine
casing materials for steam turbine
(OP)
Hi
Subject: Material for turbine casing
I want your expert opinion regarding the application of Nodular Cast Iron GGG40 for LP turbine inner casing and IP turbine outer casing in a power plant. The boiler will operate at subcritical pressure( 245 bar and temperature 540C).What are the shortcomings of using Cast Iron in Casing. Which will be the best material in these conditions.
Subject: Material for turbine casing
I want your expert opinion regarding the application of Nodular Cast Iron GGG40 for LP turbine inner casing and IP turbine outer casing in a power plant. The boiler will operate at subcritical pressure( 245 bar and temperature 540C).What are the shortcomings of using Cast Iron in Casing. Which will be the best material in these conditions.





RE: casing materials for steam turbine
For an IP outer shell you need a low alloy steel like 1Cr-1/2 Mo or 1.25Cr- 1/2 Mo (A 356 Grade 5 or 6) for elevated temperature strength and ductility to guard against thermal/mechanical fatigue cracking at shell transitions.
RE: casing materials for steam turbine
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Plymouth Tube
RE: casing materials for steam turbine
Thanks for your response and useful advice . However, I will highly appreciate if you kindly answer specifically about my queries and your recommendation/suggestion.
Thank you very much.
RE: casing materials for steam turbine
Ed has plainly and correctly stated the necessary conditions for selecting a grade of material . It is for you
to form an opinion about its suitability. In a forum like this with limited information, it is impossible to provide such specific information and no one is obliged to .
Good Luck, hope the matter rests .
RE: casing materials for steam turbine
I don't know of anyone that would currently choose such materials over cast alloy steels.
Today even many IP housings are made from cast 400 series SS grades.
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Plymouth Tube
RE: casing materials for steam turbine
RE: casing materials for steam turbine
I don't recall the exact sizes but I would guess that none of them were over 500kW.
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Plymouth Tube