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

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

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

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

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

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

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

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

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

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

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

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

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

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

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Machineability
Reheating for machine ability was done at 100 deg. less than ...

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



Restoring Overheated Steel






Category: HARDENING CARBON STEEL FOR TOOLS

The effect of heat treatment on overheated steel is shown graphically
in Fig. 65 to the series of illustrations on pages 137 to 144. This
was prepared by Thos. Firth & Sons, Ltd., Sheffield, England.



The center piece Fig. 65 represents a block of steel weighing about
25 lb. The central hole accommodated a thermo-couple which was attached
to an autographic recorder. The curve is a copy of the temperature
record during heating and cooling. Into the holes in the side of
the block small pegs of overheated mild steel were inserted. One
peg was withdrawn and quenched at each of the temperatures indicated
by the numbered arrows, and after suitable preparation these pegs
were photographed in order to show the changes in structure taking
place during heating and cooling operations. The illustrations here
reproduced are selected from those photographs with the object
of presenting pictorially the changes involved in the refining of
overheated steel or steel castings.





Next: Hardening Carbon Steel For Tools

Previous: S A E Heat Treatments



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