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

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

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

Heat Treatment Of Lathe Planer And Similar Tools
FIRE.--For these tools a good fire is one made of hard foundr...

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

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

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

The Thermo-couple
With the application of the thermo-couple, the measurement of...

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

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

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

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

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

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

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

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

Effect Of Different Carburizing Material
[Illustrations: FIGS. 33 to 37.] Each of these different p...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

The Modern Hardening Room
A hardening room of today means a very different place from ...

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



Nickel-chromium






Category: ALLOYS AND THEIR EFFECT UPON STEEL

A combination of the characteristics of nickel and the characteristics
of chromium, as described, should obviously give a very excellent
steel as the nickel particularly affects the ferrite of the steel
and the chromium the carbon. From this combination, we are able to
get a very strong ferrite matrix and a very hard tough cementite.
The strength of a strictly pearlitic steel over a pure iron is due
to the pearlitic being a layer arrangement of cementite running
parallel to that of a pure iron layer in each individual grain. The
ferrite i.e., the iron is increased in strength by the resistance
offered by the cementite which is the simple iron-carbon combination
known to metallurgists as Fe3C. The cementite, although adding
to the tensile strength, is very brittle and the strength of the
pearlite is the combination of the ferrite and cementite. In the
event of the cementite being strengthened, as in the case of strictly
chromium steels, an increased tensile strength is readily obtained
without loss of ductility and if the ferrite is strengthened then
the tensile strength and ductility of the metal is still further
improved.

Nickel-chromium alloy represents one of the best combinations available
at the present time. The nickel intensifies the physical characteristics
of the chromium and the chromium has a similar effect on the nickel.

For case-hardening, nickel-chromium steels seem to give very excellent
results. The carbon is very rapidly taken up in this combination,
and for that reason is rather preferable to the straight nickel steel.

With the mutually intensifying action of chromium and nickel there
is a most suitable ratio for these two alloys, and it has been found
that roughly 2-1/2 parts of nickel to about 1 part of chromium
gives the best results. Therefore, we have the standard types of
3.5 per cent nickel with 1.5 per cent chromium to 1.5 per cent
nickel with 0.6 per cent chromium and the various intermediate
types. This ratio, however, does not give the whole story of
nickel-chromium combinations, and many surprising results have
been obtained with these alloys when other percentage combinations
have been employed.





Next: Vanadium

Previous: Chromium



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 4629