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

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

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

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

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

The Forging Of Steel
So much depends upon the forging of steel that this operation...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

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

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

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

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

Care In Annealing
Not only will benefits in machining be found by careful anne...

Furnace Data
In order to give definite information concerning furnaces, fu...

Annealing
There is no mystery or secret about the proper annealing of d...

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

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

Tensile Properties
Strength of a metal is usually expressed in the number of pou...



Manganese






Category: COMPOSITION AND PROPERTIES OF STEEL

MANGANESE is a metal much like iron. Its chemical symbol is Mn. It
is somewhat more active than iron in many chemical changes--notably
it has what is apparently a stronger attraction for oxygen and
sulphur than has iron. Therefore the metal is used (especially in
the so-called basic process) to free the molten steel of oxygen,
acting in a manner similar to silicon, as explained above. The
compound of manganese and oxygen is readily eliminated from the
metal. Sufficient excess of elemental manganese should remain so
that the purchaser may be sure that the iron has been properly
deoxidized, and to render harmless the traces of sulphur present.
No damage is done by the presence of a little manganese in steel,
quite the reverse. Consequently it is common to find steels containing
from 0.3 to 1.5 per cent.





Next: Alloying Elements

Previous: Silicon



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