It's best to use solders and fluxes suited to steels knifemakers' normally use.
I don't use solder anymore, JB weld does just as well if joints are tight and a lot less trouble.
As Eli said, not likely to find any solder that will stand up to the heats required for heattreating serious blade steel. Brass/silver brazing are even marginal at most HTng temps.
Good heat guns will work with the low temps like Sta-Brite. Not all "low" temp solders are lead based.
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Carl Rechsteiner, Bladesmith
Georgia Custom Knifemakers Guild, Charter Member
Knifemakers Guild, voting member
Registered Master Artist - GA Council for the Arts
C Rex Custom Knives
Blade Show Table 6-H
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