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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

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

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...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

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

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

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

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

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

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

Machineability
Reheating for machine ability was done at 100 deg. less than ...

Nickel-chromium
A combination of the characteristics of nickel and the charac...

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

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

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

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



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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