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Steel Making

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

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

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

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

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

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

Connecting Rods
The material used for all connecting rods on the Liberty engi...

Reheating for machine ability was done at 100 deg. less than ...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

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

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

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

The material used for all gears on the Liberty engine was sel...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

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

Preventing Carburizing By Copper-plating


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

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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