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Steel Making

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

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

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

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

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

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

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

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

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

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

PHOSPHORUS is an element (symbol P) which enters the metal fr...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

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

A combination of the characteristics of nickel and the charac...

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

Connecting Rods
The material used for all connecting rods on the Liberty engi...

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

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

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

Double Annealing
Water annealing consists in heating the piece, allowing it to...



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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