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Steel Making

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

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

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

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

Heating
Although it is possible to work steels cold, to an extent de...

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

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Heat Treatment Of Axles
Parts of this general type should be heat-treated to show the...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

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

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

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

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

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

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

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

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

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

Quenching
It is considered good practice to quench alloy steels from th...

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



Hints For Tool Steel Users






Category: HARDENING CARBON STEEL FOR TOOLS

Do not hesitate to ask for information from the maker as to the
best steel to use for a given purpose, mentioning in as much detail
as possible the use for which it is intended.

Do not heat the steel to a higher degree than that fixed in the
description of each class. Never heat the steel to more than a
cherry red without forging it or giving it a definite heat treatment.
Heating steel at even moderate temperature is liable to coarsen the
grain which can only be restored by forging or by heat treating.

Let the forging begin as soon as the steel is hot enough and never
let tool steel soak in the fire. Continue the hammering vigorously
and constantly, using lighter blows as it cools off, and stopping
when the heat becomes a very dull red or a faint brown.

Should welding be necessary care should be taken not to overheat
in order to make an easy weld. Keep it below the sparkling point
as this indicates that the steel is burnt.

Begin to forge as soon as the welds are put together, taking care
to use gentle strokes at first increasing them as the higher heat
falls, but not overdoing the hammering when the steel cools. The
hammering should be extended beyond the welding point and should
continue until the dull red or brown heat is reached.





Next: Preventing Cracks In Hardening

Previous: Knowing What Takes Place



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