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NON-CASE is a coating which, applied to any part of
the surface of steel previous to carburizing, protects that part of the surface from the absorption of carbon.
Apply
Non-Case, dry thoroughly, proceed with the regular carburizing practice, and the piece will come out with the Non-Cased surface
soft.
Non-Case is invaluable in preventing the carburization, or hardening, of certain spots or sections of steel parts.
For instance, it is frequently used to keep the threads of bolts soft. It is applied to spots on shafts or spindles that
are to be drilled, slotted, or otherwise machined after hardening.
Often, it is desirable to leave sections of cam
shafts soft for ease in straightening after they are hardened. Likewise, shaft ends, hubs of gears, etc. must be left soft
for drilling and reaming.
Non-Case is easy to use. Apply it with a soft brush or by dipping. A thickness of 1/32"
is plenty for light work or 1/16" for heavy work. The only requirement is that it be thoroughly dry before putting in the
furnace. It will stand any heat up to 1800 F. necessary for hardening the remainder of the piece, and will stand up and protect
the surface in any kind of hardening process except liquid baths. It comes off readily after the quenching is completed and
leaves the surface clean.
Helful Information about Non-Case
USES FOR PREVENTING THE ABSORPTION OF CARBON DURING
CASE HARDENING:
1. To keep threads soft.
2. To keep spots soft for drilling.
3. To prevent brittleness in
thin sections.
4. To prevent cracking during quenching.
5. To aid in straightening operations.
6. To permit peening
and flanging without cracking.
7. Can be used on flat, round, or concave surfaces equally well.
USES ON HIGH CARBON
STEEL:
1. To keep selected areas soft during tempering.
DRYING:
Generally drying in the air is practiced
with good results. If placed near heat from a furnace, the time of drying is reduced. Do no heat above 150 F. or bubbling
and pin holes will be produced. Preheating the steel to about 100 F. may help somewhat. Be sure Non-Case is dry before packing
the steel otherwise the furnace heat will form steam which will make the Non-Case porous.
APPLICATION:
1. May
be applied with a soft brush. Usually using two coats. Apply first coat very thinly as this coat dries slowly when thick.
Apply second coat thicker as it dries faster than the first coat.
2. May be applied by dipping. One coat is usually
enough. This will be thick and will dry slowly.
3. May be applied with fingers, as this is done by many of our customers.
4.
May be spread with putty knife.
REMOVAL:
Non-Case will adhere as the steel is cooled on removal from the carburizing
furnace. If the steel is cooled from the furnace and reheated, the Non-Case will be loosened upon quenching. If quenched
directly from the furnace, it will loosen in the quench and can be knocked off easily. It will come off freely from threads
and keyways and does not affect or discolor the steel surface in any way.
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