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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

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

Chromium when alloyed with steel, has the characteristic func...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

SILICON is a very widespread element (symbol Si), being an es...

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

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

Molybdenum steels have been made commercially for twenty-five...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Sulphur is another impurity and high sulphur is even a greate...

Hardness Testing
The word hardness is used to express various properties of me...

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

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

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

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

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...



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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