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Steel Making

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Sulphur is another impurity and high sulphur is even a greate...

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

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

The Modern Hardening Room
A hardening room of today means a very different place from ...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

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

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

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

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

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

The crankshaft was the most highly stressed part of the entir...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Silicon prevents, to a large extent, defects such as gas bubb...



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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