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Steel Making

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

Hardening
The forgings can be hardened by cooling in still air or quen...

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

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Furnace Data
In order to give definite information concerning furnaces, fu...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

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

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

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

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

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

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

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

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

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...



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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