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Steel Making

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

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

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

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

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

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

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

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

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

Bessemer Process
The bessemer process consists of charging molten pig iron int...

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

Making Steel Balls
Steel balls are made from rods or coils according to size, st...



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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