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Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

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

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

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

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

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

ANNEALING can be done by heating to temperatures ranging from...

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

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

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

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

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

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

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

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

The Modern Hardening Room
A hardening room of today means a very different place from ...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...



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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