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

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

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

Nickel-chromium
A combination of the characteristics of nickel and the charac...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Crankshaft
The crankshaft was the most highly stressed part of the entir...

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

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

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Sulphur
SULPHUR is another element (symbol S) which is always found i...

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

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

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

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

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

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

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



Annealing Of High-speed Steel






Category: ANNEALING

For annealing high-speed steel, some makers recommend using ground
mica, charcoal, lime, fine dry ashes or lake sand as a packing
in the annealing boxes. Mixtures of one part charcoal, one part
lime and three parts of sand are also suggested, or two parts of
ashes may be substituted for the one part of lime.

To bring about the softest structure or machine ability of high-speed
steel, it should be packed in charcoal in boxes or pipes, carefully
sealed at all points, so that no gases will escape or air be admitted.
It should be heated slowly to not less than 1,450 deg.F. and the steel
must not be removed from its packing until it is cool. Slow heating
means that the high heat must have penetrated to the very core of
the steel.

When the steel is heated clear through it has been in the furnace
long enough. If the steel can remain in the furnace and cool down
with it, there will be no danger of air blasts or sudden or uneven
cooling. If not, remove the box and cover quickly with dry ashes,
sand or lime until it becomes cold.

Too high a heat or maintaining the heat for too long a period,
produces a harsh, coarse grain and greatly increases the liability
to crack in hardening. It also reduces the strength and toughness
of the steel.

Steel which is to be used for making tools with teeth, such as
taps, reamers and milling cutters, should not be annealed too much.
When the steel is too soft it is more apt to tear in cutting and
makes it more difficult to cut a smooth thread or other surface.
Moderate annealing is found best for tools of this kind.





Next: Tool Or Crucible Steel

Previous: Annealing



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 4698