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Steel Making

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

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

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

Hardening
Steel is hardened by quenching from above the upper critical....

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

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

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

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

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

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

Annealing
ANNEALING can be done by heating to temperatures ranging from...

Compensating Leads
By the use of compensating leads, formed of the same materia...

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...



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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