As far as the inner race of the roller bearings go, you are not heating the bearing until it is BLUE.
All you are doing is heating it for required expansion and it does not take a lot of heat.
The crankshaft journal in this case is machined for a interference fit between it and the bore of the bearing inner race, that tolerance also has some bearing on the interference (ie C0 / C1 / C2 C3)
All you have to do is warm the inner race, it takes very little heat to expand them and they all but slide on, they then cool from that very little heat and go back to normal spec and the interference is obtained with no drama to the journal.
It is the same at removal, warm the inner and when you use the puller it will come off with little fuss.
People do know there are industrial induction bearing heaters for this exact purpose ?.
Please watch this.
Just saying is all because this thread seems to have suggested you should not heat the inner's and they must be bashed on cold which is false (imho)
Someone new finds the thread and they think that is the only way.
I would add, knocking them on can result in bounce when they come up against the crank cheek.
With heat all that is needed is the shaft vertical and a tube type weight used, the inner will then cool hard up.
I also believe hard up the inner applies some support to the journal radius.