You can have the supplier to mark the heat number on every tube, but it won't be for free, you'll have to bear the cost. I say "every tube" because the tubes won't necessarily belong to the same heat. If they do belong to the same heat, then it won't be necessary to mark every tube, it'll be sufficient to state the heat number on the invoice. In this case, the invoice will read " xx tons of 1" Sch xx tube according to ASTM A106 GrB, belonging to heat number xx". It'll neither be for free, the seller will charge something to include that information.
Now, this is my opinion, which isn't necessarily the blessed truth. Your boiler must be a low pressure one (150 psig or 10 bars gage, for example). Otherwise, you wouldn't use plain carbon steel tubes. If I were the purchaser, I would require to mark the kind of steel on every tube (A106 GrB in this case) with no need to include the heat number, neither on the tubes nor on the invoice, in order not to increase cost. With the A 106 mark written on the tubes, you can be sure that they will perform as they should.
Now, a question comes to my mind. Where do the tubes come from? In this same Forum I've seen dozens of frequentors complaining that they bought such and such quality of plate, tube, forgings etc. made in China, which turned out to be of a quite a different quality (worse, of course).
Giovanni S. Crisi
Sao Paulo - Brazil
If the pipes are purchased to ASME and the marking is not up to code, i will ask the purchaser for a letter stating i have athourity to remark all items with heat, grade, ect.
usualy the pipe i get has printing all along the length.
I write letters mostly on small lengths.
but if i can trace the lot (heat) back to my PO and MTR and i have confidence in the manufacturer/supplier im good.
The AI has never questioned this.
But if you are unfamiliar with the origin of this pipe get it in writing.
MDK
ASME SA-530 (Identical to ASTM A-530 99)
SA-530
24 Product marking .
24.1 Each length of pipe shall be marked with manufacturers name/brand , the specification number (year of issue not required ) and grade. Marking Shall begin approx 12 inches from the end of each pipe
*****for pipe less than NPS 2 and Pipe under 3 feet in length , the required information may be marked on a tag securely attached to the bundle or box.that the pipe was shipeed in. ********
MDK