VIEW THE MOBILE VERSION of www.steelmaking.ca Informational Site Network Informational
Privacy
   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

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

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

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

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

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

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

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

Nickel-chromium
A combination of the characteristics of nickel and the charac...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

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

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

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

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

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

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



Silicon






Category: COMPOSITION AND PROPERTIES OF STEEL

SILICON is a very widespread element (symbol Si), being an essential
constituent of nearly all the rocks of the earth. It is similar to
carbon in many of its chemical properties; for instance it burns
very readily in oxygen, and consequently native silicon is unknown--it
is always found in combination with one or more other elements.
When it bums, each atom of silicon unites with two atoms of oxygen
to form a compound known to chemists as silica (SiO2), and to the
small boy as sand and agate.

Iron ore (an oxide of iron) contains more or less sand and dirt
mixed in it when it is mined, and not only the iron oxide but also
some of the silicon oxide is robbed of its oxygen by the smelting
process. Pig iron--the product of the blast furnace--therefore
contains from 1 to 3 per cent of silicon, and some silicon remains
in the metal after it has been purified and converted into steel.

However, silicon, as noted above, burns very readily in oxygen,
and this property is of good use in steel making. At the end of
the steel-making process the metal contains more or less oxygen,
which must be removed. This is sometimes done (especially in the
so-called acid process) by adding a small amount of silicon to
the hot metal just before it leaves the furnace, and stirring it
in. It thereupon abstracts oxygen from the metal wherever it finds
it, changing to silica (SiO2) which rises and floats on the surface
of the cleaned metal. Most of the silicon remaining in the metal
is an excess over that which is required to remove the dangerous
oxygen, and the final analysis of many steels show enough silicon
(from 0.20 to 0.40) to make sure that this step in the manufacture
has been properly done.





Next: Manganese

Previous: Phosphorus



Add to del.icio.us Add to Reddit Add to Digg Add to Del.icio.us Add to Google Add to Twitter Add to Stumble Upon
Add to Informational Site Network
Report
Privacy
SHAREADD TO EBOOK


Viewed 4355