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Characteristics

Characteristics

AALLOY20 is a low carbon, Nb stabilised austentic Ni-Fe-Cr alloy with alloying additions of Cu & Mo.?

? excellent resistance to sulphuric and phosphoric acids
? good resistance to intergranular corrosion
? very good resistance to chloride-ion induced stress-corrosion cracking
? good resistance to pitting and crevice corrosion
? good mechanical properties at both ambient and elevated temperatures, up to approximately 500 �C (930 �F).

Stock

???1000???2000???3000???3500???4000???2500??3990?

Stock Form and Sizes

Corrosion

Corrosion Resistance

ALLOY20has excellent corrosion resistance to sulphuric, phosphoric and organic acids and to aqueous solutions of their salts. Resistance to nitric acid is also good. Due to the controlled chemical composition, the alloy also has excellent resistance to such forms of corrosion as intergranular corrosion and stress corrosion. The molybdenum content ensures good resistance to pitting and crevice corrosion. Optimum corrosion resistance can only be obtained if the material is in the correct metallurgical condition and clean.

Appliction

Applications

ALLOY20 is used in a wide variety of applications up to temperatures of approximately 500�C (930�F).

Typical applications are:
? equipment for the manufacture of sulphuric acid and for processes based on sulphuric acid
? extraction columns in the production of amines and the processing of pharmaceuticals
? production of plastics and synthetic fibres
? equipment for food processing to protect against contamination

Chemical

Chemical Composition

Limits
C
Mn
Si
Mo
W
Co
V
P
S
min
15
3
max
0.01
1
0.08
17
4.5
2.5
0.35
0.025
0.01

?The values in the table are for reference only and do not guarantee minimum or maximum values. For further information, please contact us.

Mechanical

Mechanical Properties (Round Bar)

Above standard values and typical values of Round Bar.
Please contact us with any questions about reference or value of plate and pipe.
?The values in the table are for reference only and do not guarantee minimum or maximum values. For further information, please contact us.

Value
Condition
Yield Strength(Mpa)
Tensile Strength(Mpa)
Elongation(%)
Hardness(HB)
ASTM Min Value
Solution Annealed
283
690
40
Typical Values at RT
Solution Annealed
402
794
60
195
INTSTD

International Standard Comparison Chart

Standards
Material
Round Bars
Plates/Sheets
Seamless Pipe/Tube
Welded Pipe/Tube
ASTM
UNS
B574
B575
B622
B619/B626
ASME
N10276
SB574
SB575
SB622
SB619/SB626
JIS
NW0276
H4553
H4551
H4552
DIN
2.4819
17752
17750
17751
17751

Disclaimer

All the information on this website is published in good faith and for general information purpose only and not for technical design purposes. We do not make any warranties about the completeness, reliability and accuracy of this information. Any action you take upon the information on our website is strictly at your own risk. and we will not be liable for any losses and damages in connection with the use of our website.

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