Help Indentify Tool Steel /Stainless Steel

[CR100]

I was wondering if anyone can help me indentify this material. It is used in High temperature automotive applications as a bushing.

C = 1.139
Mn = .540
P = .041
S = .021
Si = 2.149
Cr = 32.812
Ni = .377
Mo = 2.054
Cu = .228
Mg = .032
W = .039
V = .277
Co = .053
Sn = .012
Al = .034
Nb = .049
Pb = .007
B =.004
Se = .002
Ta = .002
Zr = .010
Fe = Remainder

Thanks

 

[arunmrao]

It is a tool steel due to high carbon content 1.1%,Grade, I shall have to look up and let you know,or you could do that yourself now.

 

[TVP]

This does not resemble a conventional wrought alloy. Any chance that the current part is made by a powder metallurgy process (PM)? Or that the part has a coating, rendering the composition as a composite of the base metal + coating? Materials used near the exhaust side of automotive cylinder heads are often made by PM methods and/or use hard coatings such as Stellite.

 

[CR100]

It does have black coating, we figured it was nitrided.

Given so much Carbon, that hardness was only 38 HRC, which I thought was odd.



The PM comment is very interesting, as another part we have I swore is PM but it is made up of CK20 which is an investment cast 310 stainless. I am unsure if the PM composition would be the same as the cast, or would it resemble the wrought alloy more.

 

[TemperedMartensite]

32% chrome and +1% carbon makes it a very odd alloy.

 

[SMF1964]

Were it not for the carbon content, it looks like the ferritic stainless SHOMAC 30-2 that's listed in my copy of the Metals Handbook. Add a carbide coating?

 

[JoeyV87]

Are you sure you have Ni and Fe the right way around? Or swap Fe and Co and it looks like F75.

If that is a steel, it would have to be made to order by a specialist alloy supplier, it doesn't seem to fit any of the international specs.