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Steel Making

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

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

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

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

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

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

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

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

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

Crankshaft
The crankshaft was the most highly stressed part of the entir...

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

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

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

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

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

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

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

The Thermo-couple
With the application of the thermo-couple, the measurement of...



Annealing Of Rifle Components At Springfield Armory






Category: CASE-HARDENING OR SURFACE-CARBURIZING

In general, all forgings of the components of the arms manufactured
at the Armory and all forgings for other ordnance establishments
are packed in charcoal, lime or suitable material and annealed
before being transferred from the forge shop.

Except in special cases, all annealing will be done in annealing
pots of appropriate size. One fire end of a thermo-couple is inserted
in the center of the annealing pot nearest the middle of the furnace

and another in the furnace outside of but near the annealing pots.

The temperatures used in annealing carbon steel components of the
various classes used at the Armory vary from 800 deg.C. To 880 deg.C. or
1,475 to 1,615 deg.F.

The fuel is shut off from the annealing furnace gradually as the
temperature of the pot approaches the prescribed annealing temperature
so as to prevent heating beyond that temperature.

The forgings of the rifle barrel and the pistol barrel are exceptions
to the above general rule. These forgings will be packed in lime
and allowed to cool slowly from the residual heat after forging.





Next: Surface Carburizing

Previous: Annealing In Bone



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