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Steel Making

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

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

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

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

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

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

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

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

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

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

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

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

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

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

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

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

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

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

Annealing Method
Forgings which are too hard to machine are put in pots with ...

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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