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Steel Making

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

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

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

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

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

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

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Care In Annealing
Not only will benefits in machining be found by careful anne...

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

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

Alloying Elements
Commercial steels of even the simplest types are therefore p...

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

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

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

Annealing Work
With the exception of several of the higher types of alloy s...

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Corrosion
This steel like any other steel when distorted by cold worki...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...



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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