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

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

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

Although it is possible to work steels cold, to an extent de...

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

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

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

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

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

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

Silicon prevents, to a large extent, defects such as gas bubb...

Armor plate makers sometimes use the copper ball or Siemens' ...

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

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

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

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

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

Annealing Alloy Steel


The term alloy steel, from the steel maker's point of view, refers
largely to nickel and chromium steel or a combination of both. These
steels are manufactured very largely by the open-hearth process,
although chromium steels are also a crucible product. It is next
to impossible to give proper directions for the proper annealing
of alloy steel unless the composition is known to the operator.

Nickel steels may be annealed at lower temperatures than carbon
steels, depending upon their alloy content. For instance, if a
pearlitic carbon steel may be annealed at 1,450 deg.C., the same analysis
containing 2-1/2 per cent nickel may be annealed at 1,360 deg.C. and
a 5 per cent nickel steel at 1,270 deg..

In order that high chromium steels may be readily machined, they
must be heated at or slightly above the critical for a very long
time, and cooled through the critical at an extremely slow rate.
For a steel containing 0.9 to 1.1 per cent carbon, under 0.50 per
cent manganese, and about 1.0 per cent chromium, Bullens recommends
the following anneal:

1. Heat to 1,700 or 1,750 deg.F.
2. Air cool to about 800 deg.F.
3. Soak at 1,425 to 1,450 deg.F.
4. Cool slowly in furnace.

Next: High-carbon Machinery Steel

Previous: Tool Or Crucible Steel

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