Scaling temperature for 13%Cr 2.5%Ni 1.5% Mo steel 2

[JB2001]

Hi!
Do anyone of you got an idea on the scaling temperature of a steel containing 0.2%C, 13%Cr, 2.5%Ni, 1.5%Ni, 0.25%V, 0.25%Nb?
My guess is 600-700 degree C, but I have not found any written data.

 

[metengr]

For your alloy, I would consider the reference below that gives a continuous exposure temperature of 705 deg C for 410 ss. In actuality, the maximum scaling temperature would probably be slightly higher than 705 deg C (probably 750 deg C) because of the 2.5% Ni addition. The chromium and nickel alloy additions are the major contributors for elevated temperature oxidation resistance. The other alloying elements like V and Nb would tend to promote elevated temperature strength thru precipitation of carbides, in lieu of increasing resistance to oxidation.

http://www.ssina.com/temperature/index.htm

 

[EdStainless]

Under static conditionss 9Cr1Mo and 12Cr0.5Mo both show an increase in oxidation rate at about 760C.
Higher Cr alloys like 430 and 446 hit the limit at about 850C.
The estimate of ~750C sounds reasonable.
The old US Steel, Making, Shaping and Treating of Steel, has some good oxidation data.

Remember cyclic oxidation temps are much lower, and any corrodants in the air can be very damaging.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm

 

[JB2001]

Thank you metengr and Edstainless for your answers. They were both helpful to me!