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Steel Making

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

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

This steel like any other steel when distorted by cold worki...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

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

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

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

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

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

Care In Annealing
Not only will benefits in machining be found by careful anne...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

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

Critical Points
One of the most important means of investigating the properti...

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

Molybdenum steels have been made commercially for twenty-five...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

A combination of the characteristics of nickel and the charac...

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

The Packing Department


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

Next: Short Method Of Treatment

Previous: Heat-treating Department

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