Kimyo va ekologiya

Refractory steels - steel, which does not collapse under the influence of high (above 550 ⁰ C) temperature and gases
Heat resistant steels - Steel, which is used for the manufacture of parts, under load at high temperatures.
Heat treatment - a set of operations thermal effects on metals and a set of operations thermal effects on metals and alloys for the purpose and edited neniya structure and with properties in the desired direction, by annealing, hardening, tempering, normalization and others.
Steel softening - the process in which steel is heated to a certain temperature, this temperature is held for a certain time, after which it is slowly cooled
Normalization of steel - the kind of heat treatment of steel, consisting in heating (above the upper critical point), holding and cooling in air in order to give the metal a uniform fine-grained structure to increase its ductility and toughness
Hardening of steel - steel is heated above the temperature of Ac ₃ and Ac ₁ , maintained and the necessary changes in the structure of the steel, after which it quickly cools.
Vakal'yaemost steel (the degree of hardening) - the property of steel, in which as a result of hardening it increases hardness.
Steel softening is the process of incandescence of hardened steel below the Ac temperature of critical point, after keeping in a certain period of time at a given temperature a slow or rapid cooling
Sorbitol - structural constituent of iron-carbon alloys - eutectoid mixture of ferrite and cementite, dispersed varieties of perlite
Troostite is a structural component of iron-carbon alloys-an eutectoid mixture of ferrite and cementite, a variety of perlite. Austinit is cooled to about 500 ⁰ s and at this temperature, after which a mixture of ferrite and cementite is formed, in katori the hardness is higher than that of sorbitol .
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