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Steel Making

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

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

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

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

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Piston Pin
The piston pin on an aviation engine must possess maximum res...

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

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

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

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

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

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

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



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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