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Steel Making

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

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

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

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

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

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

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

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

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

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

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

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Manganese
Manganese adds considerably to the tensile strength of steel,...

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



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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