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Steel Making

Heating
Although it is possible to work steels cold, to an extent de...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

The Forging Of Steel
So much depends upon the forging of steel that this operation...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...



Preparing Parts For Local Case-hardening






Category: CASE-HARDENING OR SURFACE-CARBURIZING

At the works of the Dayton Engineering Laboratories Company, Dayton,
Ohio, they have a large quantity of small shafts, Fig. 40, that
are to be case-hardened at A while the ends B and C are to
be left soft. Formerly, the part A was brush-coated with melted
paraffin but, as there were many shafts, this was tedious and great
care was necessary to avoid getting paraffin where it was not wanted.



To insure uniform coating the device shown in Fig. 41 was made.
Melted paraffin is poured in the well A and kept liquid by setting
the device on a hot plate, the paraffin being kept high enough
to touch the bottoms of the rollers. The shaft to be coated is
laid between the rollers with one end against the gage B, when
a turn or two of the crank C will cause it to be evenly coated.





Next: The Penetration Of Carbon

Previous: Preventing Carburizing By Copper-plating



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