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Steel Making

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

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

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

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

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

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

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

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

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

Corrosion
This steel like any other steel when distorted by cold worki...

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

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

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

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

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

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

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...



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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