KNIFE MATERIAL:
1. The choice of tool material for steel composition mainly depends on the material to be cut. Since the steel will be cut by steel, the quality of the cut is always the main criterion for selection. This means that the material of the knife must be harder than the material to be cut. The second most important criterion for selecting a material must be the ability to maintain its cutting edge, that is, the cutting quality under load must be weakened anyway. Therefore, the material suitable for the tool is an alloy steel, which in principle can be hardened, can be deeply hardened and can withstand plastic deformation under pressure.
2. When selecting materials, one must decide which of these three main characteristics should be given priority, namely hardness, toughness and wear resistance, or which one of these three characteristics is desired and possible to be the best combination.
3. Since the thickness of the material to be cut can vary from 0.05 mm to 20 mm, the load of the knife on the slitting line will vary greatly. In addition to the thickness, the composition and tensile strength of the material to be cut also determine the load on the slitting line. General rule: The thinner the material to be cut, the higher the hardness of the knife.
4. There are four basic grades of steels used for slitting knives :
(a) Shock Resistance Steel/Hot Die Steel
(b) High Carbon High Chrome Steel
(c) High Speed Steel
(d) Carbide
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