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Steel Making

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

Quenching
It is considered good practice to quench alloy steels from th...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

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

The Influence Of Size
The size of the piece influences the physical properties obta...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

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

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

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

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

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

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

Gears
The material used for all gears on the Liberty engine was sel...

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

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

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

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

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

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...



Annealing Alloy Steel






Category: ANNEALING

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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