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Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

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

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

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

Sulphur
SULPHUR is another element (symbol S) which is always found i...

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

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

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

Critical Points
One of the most important means of investigating the properti...

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

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

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

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

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

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

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

Annealing
There is no mystery or secret about the proper annealing of d...



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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