199
(cementation) of steel of this group subdivide on medium solid (Gт≤700
of
MPa) and there were the increased durability (Gт> 700 MPas).
Cemented alloyed steel apply to production of the loaded details testing sign-
variable and shock loadings (cogwheels, shaft, cams, etc.). Characteristic
representatives of this group - steel 15HF, 15H, 20H-differ average durability.
After training in oil the core of details from such is strengthened by the steel, but
the surface is sensitive to cuts. Apply them to production
of the small details
operated at average loadings.
To steel of the increased durability carry in a complex alloyed and
economically alloyed. Steel 12XH3A, 20XH3A, 20XH4A apply to production
of details of averages and the big sizes working in the conditions of intensive
wear at raised loadings (cogwheels, piston fingers, axes, etc.).
Especially responsible details - cogwheels of aviation engines, ship reducers -
produce from steel 18X2H4MA, 18X2H4BA which it isn't enough soften at
drawback.
Economically alloyed steel of 18HGT, 30HGT, 25HGT is possible to replace
the nickel chrome. Their main advantage is hereditary fineness that allows
reducing a production cycle of processing of details. Such steel apply to
production of responsible details of large-lot and mass production.
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