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Steel Making

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

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

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

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

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

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

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

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

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

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

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

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

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

Critical Points
One of the most important means of investigating the properti...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Reheating for machine ability was done at 100 deg. less than ...

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.

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Previous: Tool Or Crucible Steel

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