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Steel Making

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

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

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

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

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

The Modern Hardening Room
A hardening room of today means a very different place from ...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

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

Drop Forging Dies
The kind of steel used in the die of course influences the he...

Hardening
Steel is hardened by quenching from above the upper critical....

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

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

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

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

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

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

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...



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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