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Steel Making

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

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

Molybdenum steels have been made commercially for twenty-five...

Reheating for machine ability was done at 100 deg. less than ...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

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

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

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

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

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

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

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

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

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

Phosphorus is one of the impurities in steel, and it has been...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

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

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

Shrinking And Enlarging Work


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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