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Steel Making

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

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

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

Tungsten, as an alloy in steel, has been known and used for a...

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

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

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

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

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

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

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

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

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

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

ANNEALING can be done by heating to temperatures ranging from...

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

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

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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