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| Mailing Address |
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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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| Tel: |
01527 578686 |
| Fax: |
01527 837792 |
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| Email |
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 info@ukfstainless.co.uk |
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S32109 (321H)
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Introduction:
These 0.04 to 0.10% carbon steels have an intentionally
controlled minimum carbon content to ensure consistent
creep or stress/rupture properties at elevated temperatures.
Stabilization with titanium minimizes any associated
sensitization and its effects on corrosion
resistance. ISO 2604 includes the comparable steel
No. 54, but the
steel with similar alloy contents in Euronorm 95-79:
Heat-Resisting Steels (X 10CrNiTi 18 10) specifies
0.12%C maximum but no essential minimum. Temperature
limits for low stress service/scaling in air is about
850°C. Below about 550° there are little or
no differences between the design stresses permitted
for the 0.08%C max and the 0.04-0.10%C grades ASME
II and BS5500-1991. At higher temperatures, design
stresses for the controlled carbon grades are superior.
Metallurgy:
The overall composition of the 18Cr,8-10Ni
type steels balances the ferrite-forming elements
(Cr,Mo,Si) with sufficient Ni,Mn,C and N to promote
stable austenite and prevent martensite formation.
Increasing the carbon content produces precipitates
that impede creep at high temperatures. High temperature
service and other thermal cycles in the 400-900°C
range may produce chromium carbides and sensitization
to intergranular corrosion. Stabilising additions
minimise these effects.
Composition:
| Element |
Minimum
(%) |
Maximum
(%) |
| Chromium |
17.00 |
19.00 |
| Nickel |
9.00 |
12.00 |
| Manganese |
- |
2.00 |
| Carbon |
0.04 |
0.10 |
| Titanium |
4
x (C+N) |
0.70 |
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Similiar Specifications:
ISO 2604 54
17-19%Cr, 9-13%Ni, <2%Mn, 0.04-0.10%C, 5 x C-0.8%Ti
ASTM UNS S32109 321H
17-19%Cr, 9-12%Ni, <2%Mn, 0.04-0.10%C, 4 x (C+N)-0.7%Ti
BS 321S51
17-19%Cr, 9-12%Ni, <2%Mn, 0.04-0.10%C, 5 x C-0.8%Ti
DIN X8 CrNiTi 18 10
1.4941
17-18.5%Cr, 9.5-11.5%Ni,
<0.6%Mo, <2%Mn, 0.04-0.10%C, 5 x C-0.8%Ti
JIS SUS 321HTP
17-19%Cr, 9-13%Ni, <2%Mn, 0.04-0.10%C, 4 x C-0.6%Ti
Applications:
Heavy thickness welded components operating at high
temperatures.
Furnace components.
Power station equipment - superheater tubes, steam
pipes.
Gas turbine parts.
Exhaust systems and heaters.
Bellow, gaskets.
Process plant.
Product Forms:
Plate,sheet
& strip
ASTM UNS S32109
321H 240, 480
BS 321S51 1501/3
Bar & long products
ASTM UNS S32109
321H 479
BS 321S51 1502
Forgings & others
ISO 2604 /1 F54
BS 321S51 1503
JIS SUS 321HTP 3214, 4319
Tube and/or pipe
ISO 2604 /2 (TS54)
BS 321S51 3059, 3605
JIS SUS 321HTP 3463, 3459
ASTM UNS S32109
321H 213, 249, 269, 271
Pipe
ASTM UNS S32109
321H 312, 376, 430, 813, 814, 403
General
BS 321S51 5500
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Page Last Modified: 7/04/06 17:56
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