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UKF Stainless Ltd
12 Buntsford Park Road
Bromsgrove
Worcestershire
B60 3DX
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| Telephone / Fax |
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01527 578686 |
| Fax: |
01527 837792 |
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| Email |
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 info@ukfstainless.co.uk |
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BS NA16
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Introduction:
Long-established under a proprietary designation,
now part of its UNS N08825
number, the 42%Ni, 21%Cr, 3%Mo, Cu Ti alloy derives
its broad usefulness in diverse corrosion conditions
from the technologies of both stainless steels and
nickel-base alloys. The high-nickel content endows
relative freedom from chloride stress corrosion cracking
and aids high resistance to many alkaline solutions.
Annealed and/or cold worked products resist the hydrogen
sulphide and carbon dioxide in sour oil or gas at
high temperatures and pressures. Particularly useful
for plant and equipment exposed to sulphuric acid,
sulphurous acid and sulphur-ontaining gasses. Weldments
exhibit high toughness at low cryogenic temperatures.
Design stress factors are included in ASME II and
BS5500.
Metallurgy:
Nickel, in conjunction with molybdenum and
copper, helps to give outstanding resistance to reducing
environments such as those involving sulphuric or
phosphoric acids. Its chromium content aids resistance
to oxidizing media. The addition of titanium considerably
reduces the risk of sensitization during processing
and welding, but the best corrosion performance is
likely after a stabilization anneal at
940-980°C. In cold seawater, the alloy will generaly
resist pitting but may develop some crevice corrosion.
Its PREN, about 31, cannot benefit from added nitrogen
Composition:
| Element |
Minimum
(%) |
Maximum
(%) |
| Chromium |
19.50 |
23.50 |
| Nickel |
38.00 |
46.00 |
| Molybdenum |
2.50 |
3.50 |
| Manganese |
- |
1.00 |
| Carbon |
- |
0.05 |
| Copper |
1.50 |
3.00 |
| Titanium |
0.60 |
1.20 |
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Similiar Specifications:
ASTM UNS N08825
19.5-23.5%Cr, 38-46%Ni,
2.5-3.5%Mo, <1%Mn, <0.05%C, 1.5-3.0%Cu, 0.6-1.2%Ti
BS NA16
19.5-23.5%Cr, 38-46%Ni,
2.5-3.5%Mo, <1%Mn, <0.05%C, 1.5-3.0%Cu, 0.6-1.2%Ti
DIN NiCr21Mo 2.4858
19.5-23.5%Cr, 38-46%Ni,
2.5-3.5%Mo, <1%Mn, <0.025%C, 1.5-3.0%Cu, 0.6-1.2%Ti
JIS NCF 825
19.5-23.5%Cr, 38-46%Ni,
2.5-3.5%Mo, <1%Mn, <0.05%C, 1.5-3.0%Cu, 0.6-1.2%Ti
Applications:
Sour oil and gas production plant, tubing, casings,seperators.
Expansion bellows for marine and similar chlorideenvironments.
Desalination Plant, Waste Incinerators.
Nuclear waste reprocessing. Flue gas Desulphurization.
Phosphoric and sulphuric acid plant, pickling equipment.
Marine engine exhaust systems.
Product Forms:
Plate,sheet
& strip
ASTM UNS N08825
B424
BS NA16 3072, 3073
DIN NiCr21Mo 2.4858
17744, 17750
Bar & long products
ASTM UNS N08825
B425
BS NA16 3076
DIN NiCr21Mo 2.4858
17744, 17752
Tube and/or pipe
ASTM UNS N08825
B163, B423, B704, B705, B751
BS NA16 3074
DIN NiCr21Mo 2.4858
17744, 17751
General
BS NA16 5500
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Page Last Modified: 7/04/06 17:40
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