It will be found that L66, 6s. 6d. equals 15,918 pence. Now, the four 6's added together make 24, and the figures in 15,918 also add to 24. It is a curious fact that there is only one other sum of money, in pounds, shillings, and pence (all similarly... Read more of A QUEER THING IN MONEY. at Math Puzzle.caInformational Site Network Informational
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Steel Making

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

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

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

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

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

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

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

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

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

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

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

Nickel may be considered as the toughest among the non-rare a...

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

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

Care In Annealing
Not only will benefits in machining be found by careful anne...

ANNEALING can be done by heating to temperatures ranging from...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

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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