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Steel Making

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

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

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

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Annealing Work
With the exception of several of the higher types of alloy s...

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

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

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

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

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

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

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

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



Molybdenum






Category: ALLOYS AND THEIR EFFECT UPON STEEL

Molybdenum steels have been made commercially for twenty-five years,
but they have not been widely exploited until since the war. Very
large resources of molybdenum have been developed in America, and
the mining companies who are equipped to produce the metal are
very active in advertising the advantages of molybdenum steels.

It was early found that 1 part molybdenum was the equivalent of from
2 to 2-1/2 parts of tungsten in tool steels, and magnet steels. It
fell into disrepute as an alloy for high-speed tool steel, however,
because it was found that the molybdenum was driven out of the
surface of the tool during forging and heat treating.

Within the last few years it has been found that the presence of
less than 1 per cent of molybdenum greatly enhances certain properties
of heat-treated carbon and alloy steels used for automobiles and
high-grade machinery.

In general, molybdenum when added to an alloy steel, increases the
figure for reduction of area, which is considered a good measure
of toughness. Molybdenum steels are also relatively insensible
to variations in heat treatment; that is to say, a
chromium-nickel-molybdenum steel after quenching in oil from 1,450 deg.F.
may be drawn at any temperature between 900 and 1,100 deg.F. with
substantially the same result (static tensile properties and hardness).





Next: Silicon

Previous: Tungsten



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