Yes, against a drawing or a standard, provided the composition range and the applicable specification are defined. What we will not do is guess a chemistry: if the drawing gives only a trade name and no standard, we ask which specification applies before quoting.
What makes a custom melt possible
A defined composition range — either a table on the drawing or a standard number we can work to. Without that there is nothing to melt against and nothing to test against.
A product form and size the downstream route can deliver: bar, plate, strip, tube, forging or cast stock. Some chemistries restrict which of those are practical, and that is a conversation worth having early.
A quantity that justifies a heat, and a certification requirement so the testing programme can be set at the same time.
The normal sequence
We check the composition against what the furnace and the downstream route can achieve, and against any element that is difficult to control or that tends to segregate. Then a trial or a first heat, testing to the specified standard, and delivery with the certificate. If the grade is close to something we already melt, the first heat is faster.
Why we ask for the standard
Because a trade name is a family, not a chemistry. Two alloys sold under the same family name can differ in molybdenum content by a factor of three, and the difference decides whether the part survives its service.
If the drawing names only a brand, the specification number is the missing piece — usually printed in a corner of the same drawing, or held by whoever wrote the requirement.