Fig. 202. Fig. 203. The screw thread for small bolts is represented by thick and thin lines, such as was shown in Figure 152, but in larger sizes; the angles of the thread also are drawn in, as in Figure 202, and the method of doing ... Read more of Screw Threads And Spirals at How to Draw.caInformational Site Network Informational
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Steel Making

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

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

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

A combination of the characteristics of nickel and the charac...

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

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

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

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

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

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

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

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

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

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

SULPHUR is another element (symbol S) which is always found i...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Steel is hardened by quenching from above the upper critical....

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

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

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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