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Steel Making

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

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

Hardness Testing
The word hardness is used to express various properties of me...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Drop Forging Dies
The kind of steel used in the die of course influences the he...

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

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

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

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

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

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

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

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

Nickel-chromium
A combination of the characteristics of nickel and the charac...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

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

Annealing Method
Forgings which are too hard to machine are put in pots with ...

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



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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