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Steel Making

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

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

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Silicon
SILICON is a very widespread element (symbol Si), being an es...

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

Hardness Testing
The word hardness is used to express various properties of me...

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

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

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

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

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

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

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

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

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

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

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

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...



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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