SUPERDUPLEX - UNS S32750
EN
1.4410* - EN.Name X 2 CrNiMoN 25-7-4* - SS 2328
*
Valid for sheet/plate, strip, semifinished products,
bars, rods and sections for general purposes (not
for pressure purposes).
Product standards
Seamless and welded tube and pipe: ASTM A789;
A790
Flanges: ASTM A182
Fittings: ASTM A182; (ASTM A815 applied for)
Plate, sheet and strip: ASTM A240, EN 10088*-2
Bar steel: ASTM A479, EN 10088*-3
Chemical composition (nominal) %
C
max |
Si
max |
Mn
max |
P
max |
S
max |
Cr |
Ni |
Mo |
Others |
|
0.030 |
0.8 |
1.2 |
0.035 |
0.015 |
25 |
7 |
4 |
N=0.3 |
Mechanical properties
- Metric units
Proof strength
Rp0.2
MPa min. |
Rp1.0
MPa min. |
Tensile strength
Rm
MPa |
Elong.
Ab %
min. |
Elong.
A2N %
min. |
Hardness
HRC max. |
|
550 |
640 |
800-1000 |
25 |
15 |
32 |
SUPERDUPLEX - UNS S32760
A
'Super' duplex steel with PREN about 41.
Duplex steels conbine high strength with corrosion
resistance. Their resistance to stress - corrosion
cracking in neutral chlorides is superior to that of
the 18/10 and 18/12/3 austenites. In high chloride
acidic or moderately sour environments where
hydrogen or sulphide stress crackink is more likely,
higher alloyed austenitics need also to be
considered.
Exposure to moderate and high temperatures and less
rapid cooling may cause embrittlement.
Impact values are high at room temperatures of base
material below -50°C. However, the proportion and
orientation of ferrite in welds and base material
may affect toughness at subzero temperatures
COMPOSITION
|
Element |
Minimum |
Maximum |
|
Cr |
24 |
26 |
|
Ni |
6 |
8 |
|
Mo |
3 |
4 |
|
N |
0.20 |
0.30 |
|
Mn |
|
1 |
|
C |
|
0.03 |
|
Cu |
1 |
2 |
|
W |
0.5 |
1 |
MECHANICAL & PHYSICAL PROPERTIES
Property Minimum Maximum
Solution annealed
Yeld Strength (at 20° C) (Mpa) 550
Tensile Strength (at 20°C) (Mpa) 750
Elongation on 50 mm (%) 25
Hardness Hrc 28 |
