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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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S31040 (310Nb)
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Introduction:
This is a 25 20 austenitic steel with good heat resistance.
The various wrought grades of 25-20 type steels in
international and national specifications have significant
differences in carbon, silicon and niobium contents.
Euronorm 95-79 indicates only minor differences in
average creep/stress rupture properties between 0.2%C
and 0.08%C variants and ASME II ascribes no difference
in design stresses between the niobium stabilized
and the two unstabilised grades.
To improve heat resistance, silicon maxima of 1.5-2.5%
are specified, but such steels become more susceptible
to rapid sigma formation during exposure to temperatures
in the 600-900°C range. For example, the room
temperature impact strength can drop from 100J to
3J.
Resistant to scaling in air up to temperatures of
1050-1150°C depending on grade.
Composition:
| Element |
Minimum
(%) |
Maximum
(%) |
| Chromium |
24.00 |
26.00 |
| Nickel |
19.00 |
22.00 |
| Manganese |
- |
2.00 |
| Carbon |
- |
0.08 |
| Niobium |
10
x C |
1.10 |
| Silicon |
- |
1.50 |
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Similiar Specifications:
ASTM UNS S31040 310Nb
24-26%Cr, 19-22%Ni, <2%Mn, <0.08%C,
10 x C-1.1%Nb, <1.5%Si
Applications:
Nitric acid production plant
Chemical manufacturing processes using nitric acid
Nuclear fuel reprocessing
Dye and pigment industries.
Product Forms:
Plate,sheet & strip
ASTM UNS S31040 310Nb 167, 240, 480
Bar & long products
ASTM UNS S31040 310Nb 276, 479, 484
Forgings & others
ASTM UNS S31040 310Nb 314, 484
Tube
ASTM UNS S31040 310Nb 213, 249, 450
Pipe
ASTM UNS S31040 310Nb 312, 358, 409, 530, 813, 814
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Page Last Modified: 7/04/06 17:52
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