material grade for Atmospheric furnace

[durcan]

What would the best stainless steel material for a atmospheric furnace which max temp is 500 deg C.

316L? or 304L? or any other types?
Can you give me a reason

Thanks

 

[hacksaw]

don't use the low carbon varieties, you need hot strength

 

[PAN]

durcan,
Low alloy steel (such as 5Cr-0.5Mo) might be better. What is the reason to use austenitic stainless steel in this application?

 

[durcan]

there is a low magnetic field, so any magnetic steel / material would effect it.
Mateial has to be non magnetic

 

[ThomasEun]

Recommended Materials; For Quick Access

1. Low corrosion environment at 500 deg.C :
(1) High strength/creep required: 9Cr-1Mo-V
(2) Medium strength/creep required: 9Cr-1Mo
(3) Low strength/creep required: 5Cr-1/2Mo

2. Medium corrosion environment at 500 deg.C :
(1) High strength/creep required: 347H SS
(2) Medium strength/creep required: 321H/ 304H SS
(3) Low strength/creep required: 316H SS

3. High corrosion environment at 500 deg.C :
(1) High strength/creep required: 310 SS
(2) Medium strength/creep required: 309 SS
(2) Low strength/creep required: 446 SS

* Anticipated Mass of Corrosion: V (V2O5), SO2 (Na2SO4), S, etc.

Thomas

 

[hacksaw]

vessel(furnace) design is more than picking a material and if you have specific issues redarding the electrical and or magnetic behavior and its effect on you process then a considerable amount of engineering is required just to establish the basis for design.

500 c (max)and use of austenetic stainless are little enough to define your problem, but if in addition you have a requirement as to non-magnetic, then you need to be specific as to the size of the furnace, the actual field strengths involved and at what location within the chamber, the skin temperatures involved, etc.

 

[arunmrao]

Any of the above grades 304L or 316L can be used.at 500C.Also there is another grade commonly used containing 12% Ni and 24% Cr ASTM A 297 Gr HH