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Steel Making

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

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

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

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

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

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

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

Bessemer Process
The bessemer process consists of charging molten pig iron int...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

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

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

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

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

Steel Can Be Worked Cold
As noted above, steel can be worked cold, as in the case of ...

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

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

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

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



Take Time For Hardening






Category: HARDENING CARBON STEEL FOR TOOLS

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
business.

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
properly.





Next: Carbon In Tool Steel

Previous: The Modern Hardening Room



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