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Steel Making

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

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

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

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

Impact Tests
Impact tests are of considerable importance as an indication ...

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

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

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

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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

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

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

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

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...



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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