Description
UNS N08028 (Alloy 28)
Material grades and equivalents Alloy 28/UNS N08028/W. Nr. 1.4563/X1NiCrMoCuN31-27-4
Special properties:
Good resistance against sulphuric and phosphoric acids. High resistance to localized corrosion such as pitting and crevice corrosion, as well as to stress-corrosion.
Alloy 28 Chemical composition:
|
C
|
Si
|
Mn
|
P
|
S
|
Cr
|
Ni
|
Mo
|
Cu
|
Fe
|
Min
|
•
|
•
|
•
|
•
|
•
|
26.00
|
30.00
|
3.00
|
0.6
|
22
|
Max
|
0.02
|
0.7
|
2.0
|
0.03
|
0.03
|
28.00
|
34.00
|
4.00
|
1.40
|
•
|
Alloy 28 Mechanical Properties:
Density, g/cm³
|
8
|
Melting range, °C
|
1350 – 1370
|
Alloy 28 Physical properties:
Material
|
Tensile Strength MPa
|
Yield Strength (0.2% Offset) MPa
|
Elongation (%)
|
Alloy 28
|
650
|
250
|
40
|
Alloy 28 Specifications：
Seamless tube and pipe
|
ASTM B 668, EN 10216-5, SEW 400 (Feb 1991), SS 14 25 84,NFA 49-217
|
Plate, sheet and strip
|
ASTM B 709, EN 10088-2, SS 14 25 84
|
Bar steel
|
EN 10088-3, EN 10272, SS 14 25 84
|
Fittings
|
ASTM A 403 (chemical composition and mechanical properties according to ASTM B668)
|
Alloy 28 Applications:
Alloy28 was initially developed to solve the wet-process phosphoric acid heat exchanger material. Its excellent corrosion resistance to enable it to H2S, chloride, phosphoric acid and sulfuric acid corrosion resistance, widely used in high H2S content in the oil and gas field exploitation, flue gas desulfurization system, Seawater and chloride-bearing cooling water, papermaking industry, phosphoric acid and organic acid and ester synthesis production device, is a ideal material used to replace graphite heat exchanger in the concentrated phosphoric acid.
