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   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Annealing
ANNEALING can be done by heating to temperatures ranging from...

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

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

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

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

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

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

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

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

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

The Forging Of Steel
So much depends upon the forging of steel that this operation...

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...



Double Annealing






Category: HARDENING CARBON STEEL FOR TOOLS

Water annealing consists in heating the piece, allowing it to cool
in air until it loses its red heat and becomes black and then
immediately quenching it in water. This plan works well for very
low-carbon steel; but for high-carbon steel what is known as the
double annealing treatment must be given, provided results are
wanted quickly. The process consists in heating the steel quickly to
200 deg. or more above the upper critical, cooling in air down through
the recalescence point, then reheating it to just above the critical
point and again cooling slowly through the recalescence, then quenching
in oil. This process retains in the steel a fine-grained structure
combined with softness.





Next: Quenching Tool Steel

Previous: Annealing To Relieve Internal Stresses



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