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Steel Making

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

MANGANESE is a metal much like iron. Its chemical symbol is M...

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

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

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

There is no mystery or secret about the proper annealing of d...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

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

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

Alloying Elements
Commercial steels of even the simplest types are therefore p...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

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

Tempering Round Dies


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

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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