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Steel Making

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

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

Compensating Leads
By the use of compensating leads, formed of the same materia...

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

Correction By Zero Adjustment
Many pyrometers are supplied with a zero adjuster, by means ...

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

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

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

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

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

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

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

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

High Speed Steel
For centuries the secret art of making tool steel was handed ...

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

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

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

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



Heat Treatment Of Lathe Planer And Similar Tools






Category: HIGH-SPEED STEEL

FIRE.--For these tools a good fire is one made of hard foundry
coke, broken in small pieces, in an ordinary blacksmith forge with
a few bricks laid over the top to form a hollow fire. The bricks
should be thoroughly heated before tools are heated. Hard coal
may be used very successfully in place of hard coke and will give
a higher heat. It is very easy to give Blue Chip the proper heat
if care is used in making up the fire.

FORGING.--Heat slowly and uniformly to a good forging heat. Do
not hammer the steel after it cools below a bright red. Avoid as
much as possible heating the body of the tool, so as to retain
the natural toughness in the neck of the tool.

HARDENING.--Heat the point of the tool to an extreme white heat
(about 2,200 deg.F.) until the flux runs. This heat should be the highest
possible short of melting the point. Care should be taken to confine
the heat as near to the point as possible so as to leave the annealing
and consequent toughness in the neck of the tool and where the tool
is held in the tool post.

COOL in an air blast, the open air or in oil, depending upon the
tools or the work they are to do.

For roughing tools temper need not be drawn except for work where
the edge tends to crumble on account of being too hard.

For finishing tools draw the temper to suit the purpose for which
they are to be used.

GRIND thoroughly on dry wheel (or wet wheel if care is used to prevent
checking).





Next: Heat Treatment Of Milling Cutters Drills Reamers Etc

Previous: Lathe And Planer Tools



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