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Steel Making

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

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

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

Nickel may be considered as the toughest among the non-rare a...

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

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Martien was probably never a serious contender for the honor ...

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

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

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

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

Vanadium has a very marked effect upon alloy steels rich in c...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

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



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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