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Steel Making

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

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

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

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

Armor plate makers sometimes use the copper ball or Siemens' ...

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

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

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

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

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

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

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

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

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

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

Heating Of Manganese Steel

Category: FURNACES

Another form of heat-treating furnace
is that which is used for the heating of manganese and other alloy
steels, which after having been brought to the proper heat are drawn
from the furnace into an immediate quenching tank. With manganese
steel in particular, the parts are so fragile and easily damaged
while hot that it is frequent practice to have a sloping platform
immediately in front of the furnace door down which the castings
may slide into a tank below the floor level. Such a furnace with
a quenching tank in front of its door is shown in Fig. 108.

These tanks are covered with plates while charging the furnace
and the cold castings are placed in a moderately cool furnace.
Since some of these steels must not be charged into a furnace where
the heat is extreme but should be brought up to their final heat
gradually, there is little discomfort during the charging process.
When quenching, however, from a temperature of 1,800 deg. to 1,900 deg.,
it is extremely unpleasant in front of the doors. The swinging
shield is here adapted to give protection for this work. As will
be noted it is hung a sufficient distance in front of the doors,
that it may not interfere with the castings as they come from the
furnace, and slide down into the tank.

To facilitate the work, and avoid the necessity of working with
the bars outside the edges of the shield, the slot-like hole is
cut in the center of the shield, and through this the bars or rakes
for dragging out the castings are easily inserted and manipulated.
The advantage of such a swinging shield is that it may be readily
moved from side to side, or forward and back as occasion requires.

Next: Furnace Data

Previous: Flange Shields For Furnaces

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