[MW:32509] QT stamp on Quenched and Tempered forgings

Dear Experts,

Below is an excerpt from ASME SA-350 and is related to product marking:

Could you please advise the basis of this requirement. In most cases, this stamping is specified for Quenching and tempered or Quenching and precipitation heat treated only unlike the Normalizing or Normalized and tempered.

Regards,

Vivek.

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