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

Steel Making

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

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

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

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

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

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

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

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

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

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

Silicon
SILICON is a very widespread element (symbol Si), being an es...

Chromium
Chromium when alloyed with steel, has the characteristic func...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

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

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

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

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...



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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