Determining failure temp from SS colouration
Determining failure temp from SS colouration
(OP)
We have a bearing failure and this has led to one adjacent component becoming coloured - straw colour with some blue hue.
Does anyone know the correlation of different stainless steel colours with temperature. I tried checking my annealing literature but could not find anything.
Thanks
Does anyone know the correlation of different stainless steel colours with temperature. I tried checking my annealing literature but could not find anything.
Thanks





RE: Determining failure temp from SS colouration
photographs probably wouldn't do it justice.
RE: Determining failure temp from SS colouration
You have raised an interesting question.
I will look into doing some tests on stainless bearings.
RE: Determining failure temp from SS colouration
This is in air in a furnace. Using martensitic 420ss spring strip.
Nick
I love materials science!
RE: Determining failure temp from SS colouration
Our stainless bearings primarily use SUS440C.
We are going to try and get some tests run but it will take awhile.
RE: Determining failure temp from SS colouration
http://www.mcnallyinstitute.com/05-html/5-3.html
Giving the following statement:
"The metal will become discolored and soften as it anneals. Annealing can occur any time the temperature exceeds 300°F (150°C):
Straw yellow 600° F. 315° C.
Brown 700° F. 370° C.
Blue 800° F. 425° C.
Black 900° F. 480° C"
But it does not substantiate the information. Still hunting ... !
Many thanks for the responses so far, I'll keep watch.