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

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

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

Silicon
SILICON is a very widespread element (symbol Si), being an es...

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

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...

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

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

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

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

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

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

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

Manganese
MANGANESE is a metal much like iron. Its chemical symbol is M...

Gears
The material used for all gears on the Liberty engine was sel...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...



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 3797