Certiying A 193 B7 material as A 194 2H nuts. 3

[vanmorrison]

Upon recept inspection of nuts specified as A 194 2H nuts in a purchase order the vendor has certifed A 194 2H nuts when the starting material is A 193 B7.
The starting material as per the per material traceability heat # and accompanying CMTR with the material is A 193 B7.
The CMTR supplied meets the chemical percentage requirements of A 194 2H with the exception of additional elements of Cr and Mo as specified for 193 B7.
A 194 2H specifies 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 believe this is the situation with the material received and therefor is in nonconformance 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 shopping my concern around so that I can either put my concern to rest or for validity before I raise the issue as a material and vendor noncompliance. If concerns with compliance is valid the issue may require Regulatory involvement. The nuts are being used on a high pressure turbine. Any information or comments are welcomed.

 

[TVP]

Is it possible someone just made an error and sent the wrong certification?

 

[vanmorrison]

No, the vendor is aware and has not claimed this as the case. Nuts starting from A 193 and certified as A 194 2H has been ongoing since 2005. Originating material and heat #s are different in some of the cases.

 

[cloa]

You really shouldn't double(triple) post- but given the lack of response in Metal and Metallurgy engineering I don't blame you much.

 

[vanmorrison]

Cloa, I quadrupled posted... I am new. Thanks for sharing with me the posting expectations.

 

[stanweld]

A-194 2H nuts are commonly used with A-193 B7 bolts. A-193 is not a nut specification.

 

[metengr]

This is a material nonconformance issue, period. The ... in ASTM/ASME A/SA 194, Table 1 does not imply one can add elements and declare this is a Grade 2H material. Grade 2H is a medium carbon steel nut material, not 4140.

 

[vanmorrison]

Thank you all for your responses!