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Steel Making

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

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

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

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...

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

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

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

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

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

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

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

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

The Forging Of Steel
So much depends upon the forging of steel that this operation...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

Silicon
SILICON is a very widespread element (symbol Si), being an es...

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



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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