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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

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

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

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

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

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

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

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

Martien was probably never a serious contender for the honor ...

The Influence Of Size
The size of the piece influences the physical properties obta...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

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

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

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

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

The Thermo-couple
With the application of the thermo-couple, the measurement of...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

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

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

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

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

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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