Choice of metal for high temperature application 2

[tiga852]

Seek help from material expert.

Among copper, cast iron, carbon steel and stainless steel, or any other more appropriate metal, which is more appropriate for making gas burners exposed to direct firing and high temperature? The supporting reasons for the choice.

 

[metengr]

Not enough information to provide a good recommendation. For large industrial burners exposed to radiant heat with no supplemental cooling (air or water), you need 310 stainless steel or possibly Ni-base type alloys. The 310 stainless and certain Ni-base alloys material are best suited because of the alloy content that provides oxidation resistance from exposure to radiant heat or direct flame impingement.

 

[EdStainless]

If there is no corrosion (oxidation, sulfur, so on) then a low carbon steel would work fine.
In practice the limits are related to high temperature corrosion.
You can use Cu alloys if they are water cooled and there is zero sulfur.
Cast iron works in low temp application.
Steels will handle a slightly higher temp, but no serious corrosion.
For the next step up you move to stainless steels. 430 works well in moderate applications (better than 304), for higher temps 309 or 310 are the alloys of choice. They offer both strength and high temp oxidation resistance, and even some resistance to sulfur.
Ni alloys with ceramic coatings are the top end of the scale. They are expensive and delicate, but they will resist attack very well.

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Plymouth Tube

 

[tiga852]

The application is for making gas burners and the surrounding support for domestic cooking or catering appliance. The working temperature is around 500 to 600 deg C. The gas is clean, free of sulfur.

 

[metengr]

Use 309 stainless steel for visual appearance and durability.

 

[EdStainless]

The conventional choice for this application is cast iron.
You could use 409 SS as an option.
If they are cast components then you might consider one of the CA type cast stainless alloys.
Though cast irons are much easier to work with. A spheroidal or ductile iron will withstand oxidation damage better. An iron with some Ni, Cr (and maybe even Mo) (usually all less than 1%) will also do better.

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Plymouth Tube

 

[Metalhead97]

tiga852,

FYI 500C-600C isn't considered to be 'metallurgically hot'

Metalhead

 

[mk1979]

the most applicable for this purpose is CUNi20Fe DIN17664,in my opinion.