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Steel Making

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

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

Annealing
There is no mystery or secret about the proper annealing of d...

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

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

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

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

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

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

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

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Impact Tests
Impact tests are of considerable importance as an indication ...

Double Annealing
Water annealing consists in heating the piece, allowing it to...



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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