Alloy for high temperature application 3

[alva1]

Fixed shovels attacched to the wall in rotary furnaces with operating temperatures around 1.200°C (2,200°F)where expanded clay balls are produced. They must resist also to abrasion. Which alloy (possibly not from NASA applications) could be adequate?

Thanky you

Julio

 

[davefitz]

Can they be deisgned to have aspirating air flow thru them at all times? The use of air cooling will allow less exotic alloys.

 

[alva1]

Cooling appear a hard task to implement since the furnace rotates continuously althought at low speeds. Furnace is 100 m (330 ft) long and shovels are distributed along 5 even spaced lines.

Thanks again!

Julio

 

[NickE]

Are they all the same shape and size?

Wouldn't this be an ideal application for cast iron?

Nick
I love materials science!

 

[alva1]

All the shovels have the same shape. Cast iron could be a cheaper choice but considering the temperature of operation and the presence of corrosive gases containing no doubt SO2, I doubt such material can withstand too long.

Julio

 

[EdStainless]

Sounds like a ceramic job to me.

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Rust never sleeps
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[tomwalz]

Try HP Alloys (High Performance Alloys)

http://www.hpalloy.com/index.html

Thomas J. Walz
Carbide Processors, Inc.

http://www.carbideprocessors.com

 

[arunmrao]

You can try alloy containing 50% Ni,27% Cr,1.5%W and 0.2-0.5%C for this application.

 

[gfbotha]

Assume you saw the tread not long ago: "Searching for Material that will cope with 2600F temp." Might have relevant info.

 

[stanweld]

Ni-Cr-Al and Fe-Cr-Al alloys can meet your needs from an oxidation standpoint and they still have some strength but they may or may not meet your mechanical property needs.

 

[alva1]

A very expensive alloy named W24879 (48-50%Ni, 27-30%Cr, 1,5%Mn 4-5%W, 3%Co, 0,5-2%Si and 0,35-0,40%C)very close to that suggested by arunmrao used to last 2 years but lastly it fails after 6 months. Reasons appears a combined corrosion+wear phenomenum (noticeable presence of MnS close to the surface inside a dark layer).It could be associated to the use of oil of any origin as fuel, probably of high sulphur.

Julio

 

[arunmrao]

At 1200C you have very low options. infact I am making castings in the recommended alloy this week for export to Germany.

2years is a good service life,just a wild suggestion how about trying 27% Cr iron grades.These are cheap and if downtime is not critical keep replacing .