Induction heating of Austenitic stainless steel

Question

Induction heating of Austenitic stainless steel

TheBing (Mechanical)

(OP)

25 Mar 03 23:53

Need advice to determine if using SS in an application where 9 80mm dia studs fastens the arms of an electric furnace electrode holder to its control column. The present stud material supplied by the manufacturer is 4150. Will the non magnetic properties of an austenitic stainless steel reduce induction heating of the stud? High temp causes blueing of the steel stud, elongation and subsequent loss of clamping load.

Would 317L SS or a Super Austenitic SS be an appropriate material to solve or reduce the induction heating of the Studs?

arunmrao (Materials) · Answer 1 · 2003-03-26 07:52:08

SS 304 stud will definitely avoid localised induction heating. SS 304 is commonly used as clamps and other such fastening aids in induction melting furnaces. But I am not sure if strength property wise this can replace 4150 material.

TVP (Materials) · Answer 2 · 2003-03-26 09:23:52

What is the temperature? What type of clamp load does this application need? High strength, high temperature fasteners are often fabricated from A-286, an iron-based superalloy. You can obtain more information from the following websites:

http://www.specialmetals.com/publication/tech_bulletin_a-286.pdf

http://www.spstech.com/aero/prod_lit/special_fasteners.pdf

grandprix (Aerospace) · Answer 3 · 2003-03-26 10:23:11

If you do not want to go to the expense of using a nickel alloy you may be able to get away with using a duplex stainless steel such as 2205 (uns 31803). It will give you similar strength with about half of the cost. It depends on the temperatures you are encountering and whether they are continuous.
It depends on whether the original decision to go to a 4150 was based on it's mechanical properties or only on it's availability.

GRoberts (Materials) · Answer 4 · 2003-03-26 10:37:57

Induction heating will take place in any material that conducts electricity. This basically encompasses all metals, since they can all be induction melted in a furnace. However the idea of substituting austenitic fasteners may possibly solve your problem. The austenitic materials are typically more creep resistant than ferritic ones, but a good martensitic creep risitant steel (9 or 12 Cr) may be stuitable also. Then you could also avoid the galling problems associated with austenitic fasteners.

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Induction heating of Austenitic stainless steel