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Steel Making

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

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

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

The Forging Of Steel
So much depends upon the forging of steel that this operation...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

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

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

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

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

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Manganese adds considerably to the tensile strength of steel,...

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

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

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

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

Phosphorus is one of the impurities in steel, and it has been...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

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

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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