There has been some difference in opinion on how to weigh out Heats of metal, here is the instructions I received in the 90's from the US Navy V/r HT1
Way I'm reading it, Total desired weight multiplied by percentage equals total weight of compositional additives (Sn, Zn, Pb). 1 + 1 = 2.........
See, you should have been paying attention in math class instead of hiding in the back sniffing that pregnant girl's panties.
the example is very straight forward. say you are using 3 different types of scrap, or you have a much more complicated alloy or in the case of a ferrous heat you have 50% FeSi and 30% FeMg, the math starts getting more complicated. but there it is in BW V/r HT1
That book is hard to find. It's in a few libraries but nothing local. It's written by Joe King?? Joking works for the Navy, who knew. I'm interested in the ferrous part just because that's what I used to do. We had to calculate for the recovery rate and percentage for each alloy but I don't have the formulas any more. When you try to calculate how much Silicon you need when you have 75% FeSi and an 85% recovery rate, it does get a little complicated. But then you have high oxygen level in the steel and it jumps all over the Silicon so you only recover about 40%, then you pull your hair out. I'm surprised recovery rate doesn't come in on Non-ferrous, I guess you would only have to worry about burning off elements like Zinc.
