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Steel Making

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

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

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

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

Heating
Although it is possible to work steels cold, to an extent de...

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

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

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

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

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

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

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

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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

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



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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