200
penetration of steel, stability her ambassador of holiday. The alloying nickel in
combination with other elements reduces sensitivity of details from these steel to
cuts.
Maraging steel - carbon-free (no more than 0,3% C) iron alloys with the
nickel, alloyed by cobalt, molybdenum, the titan, aluminum, chrome. Steel of
this group are perspective constructional materials.
High mechanical properties
of these steel are reached at the expense of aging of marten site, an alloying of
firm solution and training on air at temperatures 800-860zs.
Maraging steel is kept by high mechanical characteristics at low temperatures
up to temperatures of the liquefied gases. Such became and are heatproof to 500-
700zs. Advantage of the steel of this class is high technological effectiveness
of their processing. They have almost unlimited hardness penetration, well weld,
are easily processed by pressure, cutting even in the tempered condition.
Spring steel.
Steel with high limits of elasticity and the endurance, being combined with
their sufficient plasticity and viscosity; apply to production
of elastic elements
of the general appointment - springs, springs, shock-absorbers, etc.
For ensuring demanded operational properties in steel enter not less than 0,5%
of carbon, them subject to training and drawback on troostite.
Elastic elements of a simple form produce from thermally processed by the
steel. Large springs receive the coiling of annealed wire.
Spring steel carry to a class of the pearlitic. The basic alloying elements such
steel are silicon, manganese, chrome, vanadium, nickel.
Siliceous steel 50C2, 55C2, 60C2 have a high limit of fluidity and are used for
production of springs of cars, springs, etc.
Superficial defects of products from such steel sharply reduce durability of
springs. Therefore term of their service raise a superficial cold work.
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