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Steel Making

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

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

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

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

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

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

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

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

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

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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

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

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

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

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

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



Shrinking And Enlarging Work






Category: HARDENING CARBON STEEL FOR TOOLS

Steel can be shrunk or enlarged by proper heating and cooling.
Pins for forced fits can be enlarged several thousandths of an
inch by rapid heating to a dull red and quenching in water. The
theory is that the metal is expanded in heating and that the sudden
cooling sets the outer portion before the core can contract. In
dipping the piece is not held under water till cold but is dipped,
held a moment and removed. Then dipped again and again until cold.

Rings and drawing dies are also shrunk in a similar way. The rings
are slowly heated to a cherry red, slipped on a rod and rolled
in a shallow pan of water which cools only the outer edge. This
holds the outside while the inner heated portion is forced inward,
reducing the hole. This operation can be repeated a number of times
with considerable success.





Next: Tempering Round Dies

Previous: Preventing Cracks In Hardening



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