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Steel Making

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

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

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

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

MANGANESE is a metal much like iron. Its chemical symbol is M...

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

Although it is possible to work steels cold, to an extent de...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

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

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

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

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

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Critical Points
One of the most important means of investigating the properti...

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

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Process Of Carburizing


Carburizing imparts a shell of high-carbon
content to a low-carbon steel. This produces what might be termed
a dual steel, allowing for an outer shell which when hardened
would withstand wear, and a soft ductile core to produce ductility
and withstand shock. The operation is carried out by packing the
work to be carburized in boxes with a material rich in carbon and
maintaining the box so charged at a temperature in excess of the
highest critical point for a length of time to produce the desired
depth of carburized zone. Generally maintaining the temperature
at 1,650 to 1,700 deg. F. for 7 hr. will produce a carburized zone
1/32 in. deep.

Heating to a temperature slightly above the highest critical point
and cooling suddenly in some quenching medium, such as water or oil
hardens the steel. This treatment produces a maximum refinement
with the maximum strength.

Drawing to a temperature below the highest critical point (the
temperature being governed by the results required) relieves the
hardening strains set up by quenching, as well as the reducing
of the hardness and brittleness of hardened steel.

Next: Effects Of Proper Annealing

Previous: Annealing Work

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