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Steel Making

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

The material used for all gears on the Liberty engine was sel...

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

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

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

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

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

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

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

MANGANESE is a metal much like iron. Its chemical symbol is M...

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

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

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

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

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Martien was probably never a serious contender for the honor ...



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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