These steels are then rolled and folded on top of Buffalo Bills Never underestimate a woman who understands football shirt each other several times to create millions of layers on top of each other, similar to kneading the dough by flipping it over itself over and over again to homogenize it. This process removes impurities and evens out the carbon content throughout the steel and thus improve the quality of the steel. Once the Hagane, Kawagane, and shine, are rolled enough so that their impurities are burned off and that their carbon content homogenized, the different steels are hammer forged into a single billet of different types of steels. Different weapon smiths and different pricing on swords vary their construction. Notice how the blade edge always uses the Hagane whilst the upper/core Nonedge areas favor the softer metals Kawagane and shine. This is why high-quality Katanas are remarkably sharp whilst retaining their toughness. At this point, the sword billet is still straight and has not curved yet.
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Once the billet is made, the sword is then hammered into its basic Buffalo Bills Never underestimate a woman who understands football shirt shape and has clay spread throughout its body to allow differential hardening through heat treating and quenching. This process changes the crystalline structure of the iron, with varying amounts of austenite, pearlite, and martensite. Austenite and pearlite are softer but tougher, whilst martensite is harder but more brittle. Austenite and pearlite forms by slow cooling (where carbon atoms have time to redistribute themselves throughout the iron, whilst martensite forms by fast cooling. The less clay on the sword billet, the less insulation the billet has and the more martensite is formed.