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Steel Making

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

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

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Critical Points
One of the most important means of investigating the properti...

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

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

Manganese
Manganese adds considerably to the tensile strength of steel,...

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

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

Quenching
It is considered good practice to quench alloy steels from th...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Chromium
Chromium when alloyed with steel, has the characteristic func...

Annealing
ANNEALING can be done by heating to temperatures ranging from...

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



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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