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Steel Making

Hardness Testing
The word hardness is used to express various properties of me...

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

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Corrosion
This steel like any other steel when distorted by cold worki...

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

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

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

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

Nickel-chromium
A combination of the characteristics of nickel and the charac...

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

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

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

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

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



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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