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Steel Making

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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

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

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Crucible Steel
Crucible steel is still made by melting material in a clay or...

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

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

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

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

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

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...



Preventing Carburizing By Copper-plating






Category: CASE-HARDENING OR SURFACE-CARBURIZING

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
follows:

Operation
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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