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

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

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

Impact Tests
Impact tests are of considerable importance as an indication ...

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

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

Annealing
There is no mystery or secret about the proper annealing of d...

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

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

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

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Nickel
Nickel may be considered as the toughest among the non-rare a...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

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

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

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

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

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...



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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