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Steel Making

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Hardening
The forgings can be hardened by cooling in still air or quen...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

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

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

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

Conclusions
Martien was probably never a serious contender for the honor ...

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

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

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

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

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

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

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



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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