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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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 info@ukfstainless.co.uk |
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N08367
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Introduction:
This is one of four similar specifications for 6%Mo
superaustenitics
X NiCrMoCuN 25 20 6 (1.4529), UNS NO8367,
UNS NO8925 and UNS NO8926.
Each has controlled compositions with nominally 21%Cr
25%Ni 6.5%Mo 0.2%N with some variations (notably Cu
and N) between specifications. Compared with common
austenitic steels, they are considerably strengthened
by the nitrogen addition, and their higher nickel
content provides good resistance to chloride stress-corrosion
cracking plus less potential to form deleterious phases,
eg. sigma. Good resistance to pitting and crevice
corrosion in seawater (PRENs average 44-46). Formable
and weldable. Design stresses at temperatures up to
400°C are given for some types in ASME II.
Composition:
| Element |
Minimum
(%) |
Maximum
(%) |
| Chromium |
20.00 |
22.00 |
| Nickel |
23.50 |
25.50 |
| Molybdenum |
6.00 |
7.00 |
| Nitrogen |
0.18 |
0.25 |
| Manganese |
- |
2.00 |
| Carbon |
- |
0.03 |
| Copper |
- |
0.75 |
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Similiar Specifications:
ASTM UNS N08367
20-22%Cr, 23.5-25.5%Ni, 6-7%Mo, 0.18-0.25%N,
<2%Mn, <0.03%C <0.75%Cu
ASTM UNS N08925
19-21%Cr, 24-26%Ni, 6-7%Mo, 0.10-0.20%N, <1%Mn,
<0.02%C, 0.8-1.5%Cu
ASTM UNS N08926
20-21%Cr, 24.5-25.5%Ni, 6.0-6.8%Mo, 0.15-0.25%N, <1%Mn,
<0.02%C, 0.8-1.0%Cu
DIN/SEW X1
NiCrMoCuN 25 20 6 1.4529
19-21%Cr, 24-26%Ni, 6-7%Mo, 0.10-0.25%N, <2%Mn,
<0.02%C, 0.5-1.5%Cu
Applications:
Uses of the superaustenitic 25%Ni20%Cr6.5%MoCu-N steels
include:
Condenser and cooling-water piping for power stations
and other installations requiring resistance to
seawater.
Seawater and product piping systems on offshore platforms.
Duct liners and components for flue gas desulphurization
plant.
Plate or frame heat-exchangers.
Chloride-contaminated phosphoric and sulphuric acid
solutions.
Salt concentration and crystallization.
Pulp and paper plant.
Reverse osmosis high pressure piping.
Product Forms:
Plate,sheet
& strip
ASTM UNS N08367
B688
ASTM UNS N08925
B625
ASTM UNS N08926
B625
Bar & long products
ASTM UNS N08367
B691
ASTM UNS N08925
B649
ASTM UNS N08926
B649
Forgings & others
ASTM UNS N08367
B472
Tube
ASTM UNS N08367
B676, B690
ASTM UNS N08925
B674, B677
ASTM UNS N08926
B674, B677
Pipe
ASTM UNS N08367
B675, B690
ASTM UNS N08925
B673, B677
ASTM UNS N08926
B673, B677
General
DIN/SEW X1
NiCrMoCuN 25 20 6 1.4529
SEW400
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Page Last Modified: 7/04/06 17:42
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