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Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Chromium
Chromium when alloyed with steel, has the characteristic func...

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

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

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

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

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

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

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

Hardness Testing
The word hardness is used to express various properties of me...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

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

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Critical Points
One of the most important means of investigating the properti...

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

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



Tempering Round Dies






Category: HARDENING CARBON STEEL FOR TOOLS

A number of circular dies of carbon tool steel for use in tool
holders of turret lathes were required. No proper tempering oven
was available, so the following method was adopted and proved quite
successful.

After the dies had been hardened dead hard in water, they were
cleaned up bright. A pair of ordinary smiths' tongs was made with
jaws of heavy material and to fit nicely all around the outside of
the die, leaving a 3/32-in. space when the jaws were closed around
the die. The dies being all ready, the tongs were heated red hot, and
the dies were picked up and held by the tongs. This tempered them
from the outside in, left the teeth the temper required and the
outside slightly softer. The dies held up the work successfully
and were better than when tempered in the same bath.





Next: The Effect Of Tempering On Water-quenched Gages

Previous: Shrinking And Enlarging Work



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