Miss C., a lady of excellent sense, religious but not bigoted, lived before her marriage in the house of her uncle D., a celebrated physician, and member of the Institute. Her mother at this time was seriously ill in the country. One night th... Read more of The Deathbed at Scary Stories.caInformational Site Network Informational
Privacy
   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Pickling The Forgings
The forgings were then pickled in a hot solution of either ni...

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

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

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

Crucible Steel
Crucible steel is still made by melting material in a clay or...

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

Carburizing Material
The simplest carburizing substance is charcoal. It is also th...

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

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

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

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

Manganese
Manganese adds considerably to the tensile strength of steel,...

Hardening
Steel is hardened by quenching from above the upper critical....

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

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



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



Add to del.icio.us Add to Reddit Add to Digg Add to Del.icio.us Add to Google Add to Twitter Add to Stumble Upon
Add to Informational Site Network
Report
Privacy
SHAREADD TO EBOOK


Viewed 7334