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Salt bath nitriding
SURSULF™ ARCOR™ TENIFER™
TUFFTRIDE™ QPQ OPO
SURSULF™
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Salt bath nitriding using sulphur
activated non-contaminating
salts for ferrous materials. SURSULF efficiently solves all
wear, fatigue and seizure problems thanks to the exceptional
nitriding qualities of the bath (thick diffusion layer, 100%
epsilon nitrides in compound layer, compressive stresses in
superficial layer, sulphur compounds layer).
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| Operating temperature of SURSULF is
540-570°C, 30-210 min.
Because of high nitriding potential of the bath, it is possible
to gain considerable hardness in such a short time. Formed
compound layer is ductile and provides wear, seizure and fatigue
resistance. As the result of its morphology, tribologic
properties and corrosion resistance are improved. |
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SURSULF can be applied on the
following materials:
- nonalloyed steel
- alloy steel (construction and tool)
- high speed cutting steel
- cast iron and steel
- sinter
Unlike gas nitriding
there's no need for chromium or
aluminum presence in the steel.
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Application examples:
- gears, toothed shafts, camshafts
- crankshafts
- guides
- bearings
- engine valves
- valve rockers
- worm gears
- joints
- hubs
- cylinder sleeves
- threaders, drills, broaches
- dies
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ARCOR™
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ARCOR is a treatment which combines thermochemical
diffusion in
molten salt bath with passivation and finishing treatment to
produce a surface having exceptional resistance to wear, seizure,
scuffing, corrosion and fatigue. The finishing treatments are of
impregnation type with organic compounds. The parts treated with
ARCOR have an excellent black decorative appearance. The
ductility of surface layers enables excellent compatibility with
mating surfaces. ARCOR also eliminates any risk of failure due to
hydrogen embrittlement- a major problem encountered with many
applied coatings.
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| Depending on the foreseen applications, the
operating temperature
varies from 540 to 570°C and the diffusion time from 90 to 120
min. The treatment produces duplex surface layer (compact and
porous areas), consisting of epsilon nitrides and Fe, C, N, O
compounds. |
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The corrosion resistance obtained by combination
of passivation and
finishing treatment is significantly superior to many
conventional anticorrosion coatings (chromium, nickel, zinc,
...). The corrosion resistance may exceed 700 hours in salt spray
test on simple parts and reaches easily 400h on components having
welded or crimped assemblies.
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| The hardness of the compound layer in 600 to 800
HV range allows to
effectively overcome the problem of wear. The impregnation and
the surface finish lead to a substantial decrease of the coefficient of
friction. |
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ARCOR is wide- spread in the following
industries:
- automotive
- civil engineering
- arms
- hydraulics
- handling
- marine
- electromechanics
- household apparatus
- other
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