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Steel Making

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

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

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Suggestions For Handling High-speed Steels
The following suggestions for handling high-speed steels are ...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

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

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

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

The forgings can be hardened by cooling in still air or quen...

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

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

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

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

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

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

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

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

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

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

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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