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Steel Making

Hardness Testing
The word hardness is used to express various properties of me...

Nickel
Nickel may be considered as the toughest among the non-rare a...

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

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

Care In Annealing
Not only will benefits in machining be found by careful anne...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Chromium
Chromium when alloyed with steel, has the characteristic func...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

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

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

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

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

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

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

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

Double Annealing
Water annealing consists in heating the piece, allowing it to...

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

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...



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peg was withdrawn and quenched at each of the temperatures indicated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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