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Steel Making

The Thermo-couple
With the application of the thermo-couple, the measurement of...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Making Steel Balls
Steel balls are made from rods or coils according to size, st...

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

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

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

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

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

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

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

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Impact Tests
Impact tests are of considerable importance as an indication ...

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

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

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

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...



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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