Identical Heat Numbers from several MTR's
Identical Heat Numbers from several MTR's
(OP)
I am dealing with an MTR for pipe from COMCO supplier. There is confusion about the associated heat numbers. The mill has provided several MTR's with identical heat numbers showing up in separate MTR's each having slightly different compositions for both product and heat analysis. Also in the MTR are additional heat numbers that are not relevant to our tag number for the PO.
So I have two questions:
1) If the heat number traces the original cast (heat) or roll (product), how can the composition vary? For instance, wt.% carbon for heat # X = 0.13 in MTR2, and wt.% carbon for heat # X = 0.15 on MTR3. Is there an acceptable variance I should be aware of according to a standard or rule of thumb.
2) Does the mill provide multiple MTR's for the same heat number to represent different sections of pipe?
Thank you!
So I have two questions:
1) If the heat number traces the original cast (heat) or roll (product), how can the composition vary? For instance, wt.% carbon for heat # X = 0.13 in MTR2, and wt.% carbon for heat # X = 0.15 on MTR3. Is there an acceptable variance I should be aware of according to a standard or rule of thumb.
2) Does the mill provide multiple MTR's for the same heat number to represent different sections of pipe?
Thank you!





RE: Identical Heat Numbers from several MTR's
Bill
RE: Identical Heat Numbers from several MTR's
RE: Identical Heat Numbers from several MTR's
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Identical Heat Numbers from several MTR's
LittleInch, your link was very useful! - stanweld, you replied to the thread in this link and made a comment with regard to sulfur content: "There is no way that the sulfur contents could be so disparate". This concerns me a bit, as the sulfur content is 0.003 wt% in the MTR I am reviewing. We specify that it shall be less than 0.015%. What common manufacturing practice is used to reduce the sulfur content to such a low level? - I would like to follow up with our Warehouse supplier with this question. Thanks!
RE: Identical Heat Numbers from several MTR's