So today i ordered some 5mm, 500 long (20 inches) carbon steel that i will make a "home utility sword" out of. Because 500mm is the longest i can fit in my home oven when tempering. Most real swords are a lot longer than this though. Now i'd like to know how (i guess where is the keyword here) swords are usually tempered. most of them seems to be hardened in gas/coal forges. but its seems kinda hard to temper them in these. or? So how is this supposedly done? generally.