identifying steel grade from chemistry

[Naz14]

I am trying to identify a steel grade via it's chemistry. It is used in the manufacture of chain used in the food processing conveyor. It's chemistry consists of .03% Aluminum .27% Carbon .34% Chromium .03% Copper .99% Manganese .02% Nickel .07% Silicon .02% Titanium. This chemistry is very similar to SAE 1525 grade steel except for the .34% Chromium which is more than trace quantities. The chain product is heat treated after forming and welding and must exhibit fairly high strength, good wear ability, good impact resistance, and good fatigue resistance. The above chemical recipe through hardened to approx. 45-50 Rockwell "C" has proven to meet all of the requirements but I cannot identify the steel grade. If anyone knows of a grade that fits the above chemistry, please post it as I am about to the point of pulling my hair out

 

[Chumpes]

hi
in my opinion, the best way to obtain valuable information is to contact the manufacturer.

 

[metengr]

I think your correct with the 15XX series based on the Mn content. The added chromium, although not a specified element, may have been deliberate to increase hardenability.

 

[Naz14]

Thanks for the input. I did contact the manufacturer but they said it is proprietary information.

 

[MintJulep]

Where in the world is the manufacturer? Might help to narrow down the search to a smaller set of standards.

The chemistry is not far from AISI 86xx

AISI 8622H looks pretty close

http://www.matweb.com/search/datasheet.aspx?MatGUID=aa23a50590904afd9a0150fe3f309853

 

[WKTaylor]

NAZ14... General comment...

Deducing a specific alloy based on a single chemical check analysis can be difficult, since each alloy has it's 'variation limits'... and those limits may be 'allowed' a slight variation above or below [those limits] by another governing test spec.

AMS2259 Chemical Check Analysis Limits Wrought Low-Alloy and Carbon Steels helps define this quandary.

A classic example is thus...
The slight chemical variations between 4340M and 300M steel ... all within each-other's 'limit envelops'... can make segregating one from the other virtually impossible... without added physical and metallurgical [grain] evaluation/testing. NOTE the differences between 4340 and 4340M and is simply re-processing for trash/tramp-element removal/control; and/or added special wrought processing to improve the grain for physical or mechanical properties.

The best approach is as suggested earlier: ASK the vendor... but with a legitimate engineering need that demands a precise answer... and be prepared to sign proprietary rights agreements for this information. Soooo... Is 'knowing' worth the effort/cost?

NOTE: Your vendor may have a proprietary formulation for the steel in their high performance chains; or may actually allow 1-or-2-or-3 similar alternate alloys depending on 'cost/performance' or 'special performance' requirements... such as for use in extreme/non-standard environments... or not.

Regards, Wil Taylor

o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]

 

[TVP]

If this is made in Europe or Asia, it is quite likely that this is a standard grade of steel with a small Cr addition for increased hardenability, as metengr noted. 27MnCrB5-2 according to EN 10083-3 fits your stated composition if you include B in the range of 0.0008 to 0.005.