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

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

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

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

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

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

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

Annealing Work
With the exception of several of the higher types of alloy s...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

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

Bessemer Process
The bessemer process consists of charging molten pig iron int...

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

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

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



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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