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Steel Making

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

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

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

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

A combination of the characteristics of nickel and the charac...

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

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

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

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

Reheating for machine ability was done at 100 deg. less than ...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

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

Connecting Rods
The material used for all connecting rods on the Liberty engi...

Furnace Data
In order to give definite information concerning furnaces, fu...

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

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

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

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

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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