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

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

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

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

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

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

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

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

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

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

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

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

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

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

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

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

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

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...



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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