Is it compliant to certify A 193 B7 material as A 194 2H nuts? 3

[vanmorrison]

Upon receipt inspection of nuts specified as A 194 2H nuts in a purchase order the vendor certifed the nuts as A 194 2H nuts with a starting material is A 193 B7. The vendor machined nuts from A 193 material. The nuts were procured from a material organization.
The starting material as per the material traceability heat # and accompanying CMTR is A 193 B7. The CMTR supplied meets the chemical percentage requirements of A 194 2H with the exception of the additional elements of Cr and Mo as specified for 193 B7.
A 194 2H specifies that conformance to A 962 is required. It states that the starting material shall not contain an unspecified element other than nitrogen in austentic stainless steels for the ordered grade to the extent that it then conforms to the requirements of another grade for which that element is a specified element having a minimum content.
I understand this as the situation with the material received and therefore it is not conforming to the material specification, purchase order and design requirements.
In addition the differences between heat treatment requirements between the 2 materials specification I do not fully comprehend as acceptable either.
I am seeking comments and information so that I can either put my concern to rest or supporting my concern before I raise the issue as a material and vendor noncompliance. If concerns with compliance are valid the issue may require Regulatory involvement and will not be welcomed by management.

 

[EdStainless]

They don't meet chem. Period.
You can't use a "better" alloy just because you feel like it. If it does not meet all requirements of A194 2H then you would need an engineering deviation to use them.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

 

[vanmorrison]

Thank you Ed, I agree with you as did the other responders to my inquiry in the different forums that I posted. I received a polite reprimanded.
The final cert attesting that the material is A 194-2H indicate that the mechanicals are in alignment with A194-2H and stated heat treatment at 1000 deg. The minimum heat treatment for A 193-B7 is 1100.
Would this mean the A 193-B7 underwent that specs required heat treatment then heat treated again in accordance with A 194-2H?
I am not certain if the heat treatment processes of A193-B7 and A 194-2H are equal and if the different processes can correlate between the 2 different material grades.

 

[metengr]

vanmorrison;
What you are describing can bar purchased to A 193 Grade B7 be machined and reheat treated into Grade 2H nuts, per A 194 specification.

The answer is no because of chemical composition limits. There is an A 194 Grade 7 nut and this can be manufactured from A 193 Grade B7 bar, but it cannot be made to conform to Grade 2H.

 

[rmw]

HOw many fora do you have this question posted in?

rmw

 

[vanmorrison]

I am posted in 4 forums. I am new and was not aware of the expectations. I have been advised. I am receiving great responses. It won't happen again. This is a great site!

 

[rmw]

Welcome to the fourums and yes it is.

rmw

 

[PAN]

I'm curious how the manufacturer issue material certificate for ASTM A194 - 2H...

Normally, end users may not be able to check all requirements of ASTM before material receiving...

 

[vanmorrison]

Pan, the certificate was included with the material shipment.

 

[PAN]

I may be pessimistic. Some manufacturers/vendors just only provide material certificate to purchasers. However, we always find non-compliance problems during material verification and traceability...

Vendor selection should be improved for preventive action...

 

[vanmorrison]

I do not understand the context in which you refer to purchaser. Let's say; I issued the PO to the supplier. The PO specified the submission of a CMTR? I paid the supplier. Am I not the purchaser?

 

[PAN]

In my view, you are the purchaser...