Steelmaking.ca Home Steel Making Categories Manufacturing and the Economy of Machinery

Steel Making

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

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

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

Machineability
Reheating for machine ability was done at 100 deg. less than ...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

Phosphorus
PHOSPHORUS is an element (symbol P) which enters the metal fr...

High Speed Steel
For centuries the secret art of making tool steel was handed ...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

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

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

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

Annealing
There is no mystery or secret about the proper annealing of d...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

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

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

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

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...



Standard Analysis






Category: HIGH-SPEED STEEL

The selection of a standard analysis by the manufacturer is the
result of a series of compromises between various properties imparted
to the steel by the addition of different elements and there is a
wide range of chemical analyses of various brands. The steel, to
be within the range of generally accepted analysis, should contain
over 16 per cent and under 20 per cent tungsten; if of lower tungsten
content it should carry proportionately more chromium and vanadium.

The combined action of tungsten and chromium in steel gives to it the
remarkable property of maintaining its cutting edge at relatively high
temperature. This property is commonly spoken of as red-hardness.
The percentages of tungsten and chromium present should bear a
definite relationship to each other. Chromium imparts to steel
a hardening property similar to that given by carbon, although
to a less degree. The hardness imparted to steel by chromium is
accompanied by brittleness. The chromium content should be between
3.5 and 5 per cent.

Vanadium was first introduced in high-speed steel as a scavenger,
thereby producing a more homogeneous product, of greater density
and physical strength. It soon became evident that vanadium used
in larger quantities than necessary as a scavenger imparted to
the steel a much greater cutting efficiency. Recently, no less an
authority than Prof. J. O. Arnold, of the University of Sheffield,
England, stated that high-speed steels containing vanadium have
a mean efficiency of 108.9, as against a mean efficiency of 61.9
obtained from those without vanadium content. A wide range of
vanadium content in steel, from 0.5 to 1.5 per cent, is permissible.

An ideal analysis for high-speed steel containing 18 per cent tungsten
is a chromium content of approximately 3.85 per cent; vanadium, 0.85
to 1.10 per cent, and carbon, between 0.62 and 0.77 per cent.





Next: Detrimental Elements

Previous: High Speed Steel



Add to Informational Site Network
Report
Privacy
ADD TO EBOOK


Viewed 4643