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

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

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

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

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

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

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

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

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

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

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

The Thermo-couple
With the application of the thermo-couple, the measurement of...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

Nickel
Nickel may be considered as the toughest among the non-rare a...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

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

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

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...



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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