Herr H. V. Hilprecht is Professor of Assyriology in the University of Pennsylvania. That university had despatched an expedition to explore the ruins of Babylon, and sketches of the objects discovered had been sent home. Among these were draw... Read more of The Assyrian Priest at Scary Stories.caInformational Site Network Informational
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Steel Making

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

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

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

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

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Vanadium has a very marked effect upon alloy steels rich in c...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

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

High Speed Steel
For centuries the secret art of making tool steel was handed ...

SILICON is a very widespread element (symbol Si), being an es...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

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

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

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

Impact Tests
Impact tests are of considerable importance as an indication ...

Bessemer Process


The bessemer process consists of charging molten pig iron into
a huge, brick-lined pot called the bessemer converter, and then
in blowing a current of air through holes in the bottom of the
vessel into the liquid metal.

The air blast burns the white hot metal, and the temperature increases.
The action is exactly similar to what happens in a fire box under
forced draft. And in both cases some parts of the material burn
easier and more quickly than others. Thus it is that some of the
impurities in the pig iron--including the carbon--burn first, and
if the blast is shut off when they are gone but little of the iron
is destroyed. Unfortunately sulphur, one of the most dangerous
impurities, is not expelled in the process.

A bessemer converter is shown in Fig. 1, while Fig. 2 shows the
details of its construction. This shows how the air blast is forced
in from one side, through the trunnion, and up through the metal.
Where the steel is finished the converter is tilted, or swung on
its trunnions, the blast turned off, and the steel poured out of
the top.

Next: Open Hearth Process

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