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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

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

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Annealing Work
With the exception of several of the higher types of alloy s...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

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

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

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

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

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

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

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

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

Furnace Data
In order to give definite information concerning furnaces, fu...

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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