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Steel Making

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

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

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

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

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

The Influence Of Size
The size of the piece influences the physical properties obta...

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

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

Conclusions
Martien was probably never a serious contender for the honor ...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

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

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

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

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



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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