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

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

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

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

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

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

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

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

Compensating Leads
By the use of compensating leads, formed of the same materia...

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

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

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...



Quenching






Category: CASE-HARDENING OR SURFACE-CARBURIZING

It is considered good practice to quench alloy steels from the pot,
especially if the case is of any appreciable depth. The texture
of carbon steel will be weakened by the prolonged high heat of
carburizing, so that if we need a tough core, we must reheat it
above its critical range, which is about 1,600 deg.F. for soft steel,
but lower for manganese and nickel steels. Quenching is done in
either water, oil, or air, depending upon the results desired.
The steel is then very carefully reheated to refine the case, the
temperature varying from 1,350 to 1,450 deg.F., depending on whether
the material is an alloy or a simple steel, and quenched in either
water or oil.



There are many possibilities yet to be developed with the carburizing
of alloy steels, which can produce a very tough, tenacious austenitic
case which becomes hard on cooling in air, and still retains a
soft, pearlitic core. An austenitic case is not necessarily file
hard, but has a very great resistance to abrasive wear.

The more carbon a steel has to begin with the more slowly will it
absorb carbon and the lower the temperature required. Low-carbon
steel of from 15 to 20 points is generally used and the carbon
brought up to 80 or 85 points. Tool steels may be carbonized as
high as 250 points.

In addition to the carburizing materials given, a mixture of 40
per cent of barium carbonate and 60 per cent charcoal gives much
faster penetration than charcoal, bone or leather. The penetration
of this mixture on ordinary low-carbon steel is shown in Fig. 32,
over a range of from 2 to 12 hr.





Next: Effect Of Different Carburizing Material

Previous: Carburizing Material



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