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Superalloys
Superalloys are simply defined as "alloys
developed for elevated temperature service, usually based on group VIIA
elements, where relatively severe mechanical stressing is encountered and high
surface stability is frequently required". Three classes of alloys have
appeared: cobalt-base, nickel-base, and iron-base to meet this definition.
Monel is resistant to corrosion and acids, and
some alloys can withstand a fire in pure oxygen. It is commonly used in
applications with highly corrosive conditions. The good resistance against
corrosion by acids and oxygen makes monel a good material for the chemical
industry.
* Monel 400 Sheet, Plate Per QQ-N-281 CL A, AMS
4544, ASTM-B-127 * Thickness: 0.018"~3.000", Width: 12"~60", Length: 36"~192"
Small additions of aluminium and titanium form an
alloy (K-500) with the same corrosion resistance but with much greater
strength due to gamma prime formation on aging.
Copper beryllium alloys are used for their high
strength and good electrical and thermal conductivities. There are two groups
of copper beryllium alloys, high strength alloys and high conductivity alloys.
Beryllium-copper alloys have desirable properties facilitating their use in a
variety of demanding applications. The high-strength alloys (C17200 and
C17000) are less dense (.298 lbs./cu. in.) than conventional specialty
coppers. This often results in a yield of up to 7 percent more feet per pound
than high-strength phosphor bronze. The high-conductivity beryllium-copper
alloys (C17500 C17510 and C17410) are ideally suited to applications requiring
high operating temperatures, or high strength and conductivity.
C17200 Beryllium Copper: ASTM B196, AMS
4533
Most commonly utilized beryllium copper alloy and
is notable for exhibiting the highest strength and hardness compared to
commercial copper alloys. Its strength and hardness is similar to that of
steel. C17200 ultimate tensile and Rockwell hardness properties in a peak aged
condition are in the 200 ksi range and RC 45 respectively (electrical
conductivity 22% IACS minimum).
C17500/C17510 offer a combination of high electrical and thermal conductivity
with good strength compared to most copper based alloys. C17500 alloy is the
mirror image of alloy C17510 in terms of its properties and characteristics.
The alloys differ in that C17500 specifies a cobalt alloying addition
(2.40-2.70%) and alloy 17510 specifies a nickel alloying addition
(1.40-2.20%), but their performance are the same.
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