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Steel Making

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

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

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

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

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

Manganese
Manganese adds considerably to the tensile strength of steel,...

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

Air-hardening Steels
These steels are recommended for boring, turning and planing...

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

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

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

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

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

Compensating Leads
By the use of compensating leads, formed of the same materia...

Crucible Steel
Crucible steel is still made by melting material in a clay or...

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

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

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

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

Sulphur
SULPHUR is another element (symbol S) which is always found i...



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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