Copper tube specification & hardness

[kclim]

I've been asked to verify a batch of copper alloy tubes that has been recently delivered to us. The specification called for EN12451 CuNi10Fe1Mn (90/10 copper nickel) in the R310 condition.

In the process of verifying the material condition (R310). Was hoping to do this via a vickers tests, which I am able to do in house. However, R310 refers to tensile strength rather than hardness. Ideally, would send it off to a capable lab for a tensile tests, but this is supposed to be quick check, and time and money constraints come into play.

Was wondering if there was a conversion chart available for copper nickel materials?

Also, I've noted the material conditions are grouped together in the standard. For CuNi10Fe1Mn, R310 and H105 are grouped together. H105 does have hardness properties listed. Are the two grades essentially the same? If so, this would eliminate the need to convert the hardness values I'm measuring.

Thanks

 

[EdStainless]

You need to test tensile, and maybe a micro. If you had a number of lots from the same mill then you might be able to use hardness, but I wouldn't trust a general conversion. Besides you really need to know the elongation.

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[TVP]

kclim,

Neither ASTM E 140 nor ISO 18265 lists conversions from hardness to strength for copper alloys. I agress with EdStainless that you should have the tubes tensile tested.