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Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

The Modern Hardening Room
A hardening room of today means a very different place from ...

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

SULPHUR is another element (symbol S) which is always found i...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

Drop Forging Dies
The kind of steel used in the die of course influences the he...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

The material used for all gears on the Liberty engine was sel...

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

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

Preventing Carburizing By Copper-plating


Copper-plating has been found effective and must have a thickness
of 0.0005 in. Less than this does not give a continuous coating.
The plating bath used has a temperature of 170 deg.F. A voltage of
4.1 is to be maintained across the terminals. Regions which are
to be hardened can be kept free from copper by coating them with
paraffin before they enter the plating tank. The operation is as

No. Contents of bath Purpose
1 Gasoline To remove grease
2 Sawdust To dry
3 Warm potassium hydroxide solution To remove grease and dirt
4 Warm water To wash
5 Warm sulphuric acid solution To acid clean
6 Warm water To wash
7 Cold water Additional wash
8 Cold potassium cyanide solution Cleanser
9 Cold water To wash
10 Electric cleaner, warm sodium Cleanser to give good
hydroxide case-iron anode plating surface
11 Copper plating bath of copper Plating bath
sulphate and potassium cyanide
solution warm

There are also other methods of preventing case-hardening, one
being to paint the surface with a special compound prepared for
this purpose. In some cases a coating of plastic asbestos is used
while in others thin sheet asbestos is wired around the part to
be kept soft.

Next: Preparing Parts For Local Case-hardening

Previous: Carburizing By Gas

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