Use or grade of this steel?

[Metalero]

Hi everybody.
Have you used this steel or do you know which grade is or typical use?
Yes, It's look like AISI Serie 61xx, Cr-V Steel (like the legend in some handtool), but i'm not sure about the Moly content in this serie.
C = 0.22, Mn = 1.11, Si = 0.29, P = 0.011, S = 0.003, Cr = 0.88, V = 0.13, Cu = 0.16 AND Mo = 0.52

Thanks a lot.

 

[Chumpes]

could it be 1Cr-0.5Mo (ASTM A387 grade 12) with too much carbon (>0.17) and manganese (>0.73) ?

 

[weldstan]

This would be used in relatively high temp applications from 800F to 1000F.

 

Carbon is too high to be one of the Cr-Mo steels. Also, V is high enough to consider it deliberately added, and that also doesn't mesh with any Cr-Mo steels that are around 1 or 1¼% Cr.
What is the product form?

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[Metalero]

Hi Ironic Metallurgist

The original shape of the product is unknown, I only have fragments of damaged and irregular geometry that was found in a very unusual location and in the vicinity there are from heavy machinery, pipes and various irons to hand tools.

in principle I also considered it to be some degree of a Cr-Mo steel, however I noticed that the V is high and looks more like a Cr-V steel, close to the AISI 6120, although Mo is not considered in this grade.

 

Clearly not pressure equipment so it is some AISI grade or foreign equivalent. Are you just trying to reverse engineer a part or identify foreign material? This alloy could very well have been used for hand tools.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[Metalero]

Yes, reverse engineer to a foreign material for positive material identification (PMI).

Yes, hand tool is my first suspicion, but I would like to back this conjecture with technical information. Specification sheets, literature, analysis of chemical composition that you have made to popular hand tools or perhaps not a hand tool, but a component that has that composition.

 

[pradipgoswami]

You may perform PMI with a reputed manufacturers' instrument,e.g. Niton or Oxford Alloys or other established manufacturers' product. The data base of the PMI equipment would reveal the nearest North American or overseas grade.

The other option according to be would be resource sites e.g.: matweb:

http://www.matweb.com/search/DataSheet.aspx?MatGUID=449aa27cc2bb4fee94767c3ee0ad0cc6&ckck=1.

AISI steels comes in lot of forms and shapes, many of them are not used in BPV codes, hence there are possibilities of getting steels with Higher "C Content" as well as with odd/uncommon compositions. If the component is a tool steel "C" may be high as compared to ASME/ASTM grades.

Thanks.

Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299

 

PMI would not be useful in determining the grade, since it does not test for carbon.
Exact compositional correspondence is not necessary. Final mechanical properties are where the rubber meets the road, so to speak.
What you want to do here is find an AISI grade with reasonably similar overall composition and very similar carbon, such that the hardenability properties are similar. Hardenability is the primary distinguishing characteristic of the low alloy AISI steels. Any proper metallurgist should be able to pull a few suitable candidates from the extensive list of AISI steels.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[pradipgoswami]

PMI methods commonly uses 2 techniques.
[ol 1]
OES--which detects all alloying elements, including "C",
XRF-Which detects all other alloying elements , except, C, S, P and a few other lighter elements depending on the equipment capability. In fact all XRF based equipment used for PMI are equipped with an inbuilt data base, so as to compare and provide results on the spot.That'd why such equipments are polpular for materials sorting also.

These are the only convenient ways to start reverse engineering on any unknown material.

The other option is to go back to the OEM and find out the grade procured or used for manufacturing and go from there.However experiences may say depending on the country of origin, the OEM is could beat loss about the grades used in their product. In those cases end user has to dig the dirt to gather information.

For Marriola V: If you're convinced about this steel being AISI 6120 or equivalent, please do a worldwide search for this grade.In fact if you know the country of origin of the product, searching the correct grade would be easy, if you do not have access to PMI equiments.


Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299

 

[EdStainless]

There are a couple of other portable chem methods that are starting to become more common, one is LIBS and I don't recall the other.
These will detect elements down to C with good precision

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P.E. Metallurgy, Plymouth Tube

 

PMI as practiced is understood to mean XRF using a hand held instrument. It is the biggest moneymaker for inspection companies, who have overhyped it to the point where many clients believe it is equivalent to chemical analysis.
I am familiar with OES, and it is a major and expensive undertaking in the field. It is essentially full chemical analysis, so it a little misleading to describe it as PMI.
I'm certain the sample of material under discussion here could be spark tested in a lab, for under U$80.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."