I never needed to melt the stuff in any particular order. *
Here’s the recipe for it.
Note how it requires:
4 wrought iron
3 Invar
1 Chromium
1 Manganese
*Also note, i don’t make invar in the same batch. Of course you could do…
In the same batch, but then the order does indeed become important as this is the recipe you’ll get FIRST if you have any chromium in the crucible with nickel in it.
NOTE the lower temperature than the invar recipe. This is why your batch fails.
Hence, i NEVER bother making alloys from stuff that isn’t exactly what the alloying recipe calls for.
I.E, i make the invar first and only use invar in the stainless steel recipe.
Wrought iron is the only thing i substitute regular iron for. But that’s because wrought iron and iron are essentially the same thing, just different temperatures.
In summary, make invar first and use that as the ingredient.
Or you’d have to ONLY throw in chromium after the temperature has reached 1916K