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Steel Making

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

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

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

Alloying Elements
Commercial steels of even the simplest types are therefore p...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

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

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

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

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

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

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

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

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

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

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

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...



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



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