VIEW THE MOBILE VERSION of www.steelmaking.ca Informational Site Network Informational
Privacy
   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

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

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

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

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

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

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Corrosion
This steel like any other steel when distorted by cold worki...

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

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

Conclusions
Martien was probably never a serious contender for the honor ...

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

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

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

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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

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

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

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...



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 6035