UHB 15N20 steel flat bar for knife blade making. It is also used in combination with carbon steel for damascus blade making
It is annealed with a clean surface.
15N20 steel is combined with HR1095 for damascus steel.
2% Nickel (Ni). Adds toughness. Present in L6 and AUS6 and AUS8. Nickel is widely believed to play a role in corrosion resistance as well, but this is probably incorrect. One more reason Ni is added to an alloy is that it creates brighter portions in damascus steels.
0,75% Carbon (C). Present in all knife steels, it is the most important hardening element. Increases tensile strength and edge retention and improves resistance to wear and abrasion. Added in isolation, decreases toughness.
0,40% Manganese (Mn). An important element, Manganese improves grain structure and contributes to hardenability, strength, and wear resistance.
0,30% Silicon (Si). Contributes to strength. Like Manganese, deoxidizes and degasifies to remove Oxygen from molten metal.
0,20% Phosphorus (P). Present in small amounts in most steels, phosphorus is essentially a contaminant, which reduces toughness. In very small amounts improves strength, machinability, and hardness.
0,10% Chromium (Cr. Added for increased wear resistance, hardness, tensile strength, and (most importantly) for corrosion resistance. Cr forms large, complex carbides. A steel with at least 13% chromium is typically deemed "stainless".
0,005% Sulfur (S). Typically not desirable in cutlery steel, sulfur increases machinability, but decreases toughness.