Erosion rate between stainless steel and carbn steel at high temperature

[jtseng123]

Dear all,
Which one has higher erosion rate between SA-240-304H SS and SA-516-70 at 1000 degF ?

 

[MJCronin]

According to ASME-VIII, usage of SA516-70 carbon steel is not permitted at 1000F .... usage is limited to about 750F, as I recall

High temperature erosive service, such as that found inside a coal fired boiler depends on many factors, including the hardness of the material

This is a difficult question ..... can you tell us more about what you are trying to accomplish ???

MJCronin
Sr. Process Engineer

 

[jtseng123]

MJCronin, we use SA-516-70 up to 1050F for internal non-pressure or very low pressure (5 psig) parts in FCCU reactor, even they are under mechanical and thermal loading in an abrasive condition from catalyst particles. Low alloy is another option, but not necessary.
It is mixed bags that CS and SS are used for internal parts based on past experience or personal preference without a technical reasoning. So I just need to know which material can resist more erosion in high temp to standardize the material selection. It may have some relationship with hardness.

 

[EdStainless]

The SS will have lower erosion rates, but not as much different as at lower temps.
At lower temp the surface of the SS work hardens considerably, at 1000F this will effect be reduced considerably.
I would suggest using steel, and in places where you are getting (or expecting) erosion using a ceramic or Co alloy overlay.

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P.E. Metallurgy, Plymouth Tube

 

[metengr]

I can't see how carbon steel would survive under the stated conditions simply because the break away oxidation rate of CS is near 1000 deg F, which means erosion and oxidation will increase wastage (the loss of material), period.

I would definitely use Cr-Mo (SA 387 Gr D plate material) at the stated conditions versus carbon steel.