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I designed some parts to be made out of C360. Called a metal distributor (one of the county's largest) and they had C360 with Heat numbers. I forgot to ask to see the MTR before ordering. When I got the papers all the supplier gave me was a Certificate of Conformance saying they would only guarantee the chemical composition not the physical. Since the parts were made I sent out a piece to get tested and it failed.

Selling something with a heat number and no test papers is that common?

If the metal failed how can you call it C360?


What exactly failed? The chemical composition did not meet a specification requirement? Which specification? The mechanical properties did not meet a specification requirement? I would say that it is fairly common for large distributors to stock items that are certified for chemical composition only. Obviously this has some limitations for the end user.


Yes, certificates of conformance are very common because for general use most users do not need to worry about mechanical properties; they assume them (from what I observe, and do not agree).

Most Codes and Standards and recognized international material specifications require material test reports to be supplied with product forms or at least require mechnical properties to be met by reference to the material specification.
Once again buyer beware.

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