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Steel Making

Quenching
It is considered good practice to quench alloy steels from th...

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

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

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

Impact Tests
Impact tests are of considerable importance as an indication ...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

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

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

The Influence Of Size
The size of the piece influences the physical properties obta...

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

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

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

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

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

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

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

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



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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