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Steel Making

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

Corrosion
This steel like any other steel when distorted by cold worki...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

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

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

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

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

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

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

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

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

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

Silicon
SILICON is a very widespread element (symbol Si), being an es...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

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

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

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

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...



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peg was withdrawn and quenched at each of the temperatures indicated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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