201
Graphitized steel is applied to production of the details operated in the
conditions of friction, sliding. This steel receive from high carbon steel (1,5-2%
C) with the raised content of silicon which promotes graphitization.
Corrosion-resistant steel.
To the corrosion-resistant steel carry the metal materials which aren't
collapsing under the influence of corrosion environments. Corrosion-resistant
steel subdivide into two main classes: chromic and chromium –nickel.
Chromic steel possess high corrosion resistance which increases after heat
treatment and giving of high purity of a surface of products (grinding,
polishing).
Steel of brand 3Х13, 4Х13 use for production of surgical tools. X17, H25T-of
the equipment of chemical plants. X25T, H28-of the details operated in high-
hostile environment.
Chrome-nickel steel, alloyed by chrome and nickel, possess higher resistance
to corrosion in comparison with the chromic. Steel of this class are technological
when processing by pressure, well cook, however have low indicators of
foundry properties and a workability cutting.
At violation of modes of heat treatment, and also at operation of details at
increased temperatures (400-800zs) corrosion resistance chrome-nickel steel
sharply decreases. For elimination of this lack of steel in addition alloy the titan
and niobium.
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