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

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

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

The Electric Process
The fourth method of manufacturing steel is by the electric f...

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

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

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

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

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

The Modern Hardening Room
A hardening room of today means a very different place from ...

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

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

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

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

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



The Packing Department






Category: HEAT TREATMENT OF STEEL

In Fig. 56 is shown the packing pots where
the work is packed. These are of malleable cast iron, with an internal
vertical flange around the hole A. This fits in a bell on the
end of the cast-iron pipe B, which is luted in position with
fireclay before the packing begins. At C is shown a pot ready
for packing. The crown gears average 10 to 12 in. in diameter and
weigh about 11 lb. each. When placed in the pots, they surround
the central tube, which allows the heat to circulate. Each pot
contains five gears. Two complete scrap gears are in each furnace
(i.e., gears which fail to pass machining inspection), and at
the top of front pot are two or more short segments of scrap gear,
used as test pieces to gage depth of case.



After filling to the top with compound, the lid D is luted on.
Ten pots are then placed in a furnace. It will be noted that the
pots to the right are numbered 1, 2, 3, 4, indicating the position
they are to occupy in the furnace.

The cast-iron ball shown at E is small enough to drop through
the pipe B, but will not pass through the hole A in the bottom
of the pot. It is used as a valve to plug the bottom of the pot
to prevent the carburizing compound from dropping through when
removing the carburized gears to the quenching bath.

Without detracting from the high quality of the work, the metallurgist
in this plant has succeeded in cutting out one entire operation
and reducing the time in the hardening room by about 24 hr.

Formerly, the work was carburized at about 1,700 deg.F. for 9 hr. The
pots were then run out into the yard and allowed to cool slowly.
When cool, the work was taken out of the pots, reheated and quenched
at 1,600 deg.F. to refine the core. It was again reheated to 1,425 deg.F.
and quenched to refine the case. Finally, it was drawn to the proper
temper.





Next: Short Method Of Treatment

Previous: Heat-treating Department



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 3915