Hardening is one way to improve the thermal properties of carbon steel in hardness and resistance to abrasion. This process begins with to heat a steel until the temperature structure change as nanai hostel. Leave in the oven until it has a uniform structure, Halle hostel nanai and cooled with enough speed that caused the structure to Marta pour nasai or the cooling rate crisis. (The Critical cooling rate) in order to achieve Teda nasai Marcelo structure uniformity.HRC53 (Rockwell C Hardness Test) a hoist style veil CD suitable for testing rigid material, such as hardened steel. The hardness, suitable for hoist wells is in the range 20 – 67 HRC.The AB (Meatal Blackening) is making the change to metal oxides. The metal black film on the surface of a metal stick. AB-in the steel work piece is boiled in an iron Warrior aqueous NaOH and contains NaNO 3 temperature 135-145. Degrees, which will see a piece of work is black, then wipe dry with a clean water rinse and then anoint with oil.Good message.1. increase the beauty and value creation.2. corrosion protection
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