Steel grade? 2

[Flesh]

I have a bolt material with this chemistry:
C - 0.40
Mn - 1.13
S - 0.005
P - 0.010
Si - 0.26
Mo - 0.22
Cu - 0.17
Al - <0.005
V - <0.005
Nb - <0.005

I couldn't really match it up with a US grade (possibly an SAE 40XX grade). Any idea what this could be? Foreign grade?

 

[metengr]

Where was it used?

 

[Flesh]

Used in the U.S.

 

[EdStainless]

What application, type of equipment?
Any markings at all?
Was the anlaysis with a portable unit or a real lab chemistry? Where is the Cr?

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[Flesh]

SAE Gr. 8 flange head, ~5/8"-coarse.

I don't remember what the head markings are, but this is suppose to be Gr 8. Measured core hardness is 35HRC.

Analysis done with ICP-OES, in a lab.

It is not alloyed with Cr or Ni, but here are the values:
Cr - 0.07
Ni - 0.08

 

[CoryPad]

This appears to be 4037 (commonly used for Grade 8 fasteners) with extra manganese (perhaps unintentional, or just variation from heat to product).

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[unclesyd]

Depending on where it is to be used it could be a no Grade bolt. I would definitely not use this in an application that calls for a Grade 8 fastener. If the bolt in application leaves your site you are subject to all sorts of liabilities.

 

[dbooker630]

I've seen J1199 grade 10.9 (similar to J429 cl8) fasteners made from 4037 Modified, with chemistries such as the one you describe.

It is a low-cost alternative to 4140 steel, the hardenability is slightly lower than 4140 but the chemistry is enough to permit its use in larger diameter fasteners where straight 4037 will not sufficiently harden.

 

[Flesh]

dbooker630: That was my suspicion after CoryPad's post. Thanks. The SAE J429 standard does not limit material to actual "grades", rather some sort of alloyed medium carbon steel in my case. To further my suspicion it is a modified grade, this fastener is acutually 3/4"-coarse (not 5/8" as I originally thought). A modified grade (of 4037) I think would be needed to meet the 90% martensite requirement of the SAE standard. Thanks for everyone's input.