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Heat number identification on steels plates

Heat number identification on steels plates

Heat number identification on steels plates

(OP)
The following heat number / identification markings were taken off some steel plate.  Can anyone help me identify it?

75A679 287993 AAR-TC 128GRB USS

I recognize the material - AAR-TC128 GRB.
I think the Mill is US Steel
I'm not sure of the meaning of the digits of the first two number groupings.

Thanks

RE: Heat number identification on steels plates

rbrez,
Do you have a material test report by any chance?  I believe you have correctly identified the mill.  It is possible that the first two number groupings constitute the heat number although it is possible that the 75A679 is a reference to the 1975 edition of ASTM specification A679 for high tensile, cold drawn steel wire, although I see no reason this would appear on plate.  Are these the original mill markings?  Where did you procure this material from and what is the intended fabrication/service?
Regards,
RLS

RE: Heat number identification on steels plates

(OP)
Thanks for the reply.  That is the problem, I do not have the Mill test reports.  I agree that the 75 could be the year.  The plate TC 128 GRB is a special plate used in the railcar tank building industry.  I am just trying to find out what the code markings mean.
  

RE: Heat number identification on steels plates

Contact US steel QA department.

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