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Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

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

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

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

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

Double Annealing
Water annealing consists in heating the piece, allowing it to...

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

Oil-hardening Steel
Heat slowly and uniformly to 1,450 deg.F. and forge thorough...

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

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

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

Martien was probably never a serious contender for the honor ...

Take Time For Hardening


Uneven heating and poor quenching has
caused loss of many very valuable dies, and it certainly seems
that when a firm spends from $75 to $450 in cutting a die that
a few hours could be spared for proper hardening. But the usual
feeling is that a tool must be hurried as soon as the hardener
gets it, and if a burst die is the result from either uneven or
overheated steel and quenching same without judgment, the steel
gets the blame.

Give the steel a chance to heat properly, mix a little common sense
with your 30 years experience on the other fellows steel. Remember
that high-carbon steel hardens at a lower heat than low-carbon
steel, and quench when at the right heat in the two above ways,
and 99 per cent of the trouble will vanish.

When a die flies to pieces in quenching, don't rush to the
superintendent with a poor-steel story, but find out first why it
broke so that the salesman who sold it will not be able to harden
piece after piece from the same bar satisfactorily. If you find
a cold short, commonly called a pipe, you can lay the blame
on the steelmaker. If it is a case of overheating and quenching
when too hot, you will find a coarse grain with many bright spots
like crystals to the hardening depth. If uneven heating is the
cause, you will find a wider margin of hardening depth on one side
than on the other, or find the coarse grain from over-heating on
one side while on the other you will find a close grain, which
may be just right. If you find any other faults than a pipe,
or are not able to harden deep enough, then take the blame like
a man and send for information. The different steel salesmen are
good fellows and most of them know a thing or two about their own

For much work a cooling bath at from 50 to 75 deg.F. is very good both
for small hobs, dies, cutter plates or plungers. Some work will
harden best in a barrel of brine, but in running cold water, splendid
results will be obtained. Cutter plates should always be dipped
corner first and if any have stripper holes, they should first
be plugged with asbestos or fire clay cement.

In general it may be said that the best hardening temperature for
carbon steel is the lowest temperature at which it will harden

Next: Carbon In Tool Steel

Previous: The Modern Hardening Room

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