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Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

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

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

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

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

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

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

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

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

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

Chromium
Chromium when alloyed with steel, has the characteristic func...

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

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

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...



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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