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Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Care In Annealing
Not only will benefits in machining be found by careful anne...

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

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

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

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

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

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

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

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

The Forging Of Steel
So much depends upon the forging of steel that this operation...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

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

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

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



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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