Informational Site NetworkInformational Site Network
Privacy
 
   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

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

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Nickel
Nickel may be considered as the toughest among the non-rare a...

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

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

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

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

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

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

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

Heating
Although it is possible to work steels cold, to an extent de...

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Quenching
It is considered good practice to quench alloy steels from th...

Annealing
ANNEALING can be done by heating to temperatures ranging from...



Quenching






Category: CASE-HARDENING OR SURFACE-CARBURIZING

It is considered good practice to quench alloy steels from the pot,
especially if the case is of any appreciable depth. The texture
of carbon steel will be weakened by the prolonged high heat of
carburizing, so that if we need a tough core, we must reheat it
above its critical range, which is about 1,600 deg.F. for soft steel,
but lower for manganese and nickel steels. Quenching is done in
either water, oil, or air, depending upon the results desired.
The steel is then very carefully reheated to refine the case, the
temperature varying from 1,350 to 1,450 deg.F., depending on whether
the material is an alloy or a simple steel, and quenched in either
water or oil.



There are many possibilities yet to be developed with the carburizing
of alloy steels, which can produce a very tough, tenacious austenitic
case which becomes hard on cooling in air, and still retains a
soft, pearlitic core. An austenitic case is not necessarily file
hard, but has a very great resistance to abrasive wear.

The more carbon a steel has to begin with the more slowly will it
absorb carbon and the lower the temperature required. Low-carbon
steel of from 15 to 20 points is generally used and the carbon
brought up to 80 or 85 points. Tool steels may be carbonized as
high as 250 points.

In addition to the carburizing materials given, a mixture of 40
per cent of barium carbonate and 60 per cent charcoal gives much
faster penetration than charcoal, bone or leather. The penetration
of this mixture on ordinary low-carbon steel is shown in Fig. 32,
over a range of from 2 to 12 hr.





Next: Effect Of Different Carburizing Material

Previous: Carburizing Material



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 5802