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X6 CrNi 25 20
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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 |
| Silicon |
- |
1.50 |
|
Similiar Specifications:
ISO 4955 H15
24-26%Cr, 19-22%Ni, <2%Mn, <0.08%C,
<1.5%Si
EURONORM X6 CrNi 25 20
24-26%Cr, 19-22%Ni, <2%Mn, <0.08%C, <1.5%Si
ASTM UNS S31008 310S
24-26%Cr, 19-22%Ni, <2%Mn, <0.08%C, <1.5%Si
BS 310S16
24-26%Cr, 19-22%Ni, <2%Mn, <0.08%C, <1.0%Si
DIN/SEW X12 CrNi 25 21 1.4845
24-26%Cr, 20-23%Ni, <2%Mn, <0.15%C, <0.75%Si
Applications:
Furnace and oven components - arch supports, linings,
conveyors, burners, heating tubes
and element supports. Petrochemical plant and gas
turbine components.
Product Forms:
Plate,sheet & strip
ASTM UNS S31008
310S 167, 240, 480
BS 310S16 1501/3
JIS SUS 310S 4304, 4305, 4307
Bar & long products
ASTM UNS S31008
310S 276, 476, 484
JIS SUS 310S 4303, 4308, 4318, 4311
Forgings & others
ASTM UNS S31008
310S 314, 473, 484
Tube and/or pipe
JIS SUS 310S 3463, 3459
ASTM UNS S31008
310S 213, 249, 450, 511, 554
Pipe
ASTM UNS S31008
310S 312, 358, 409, 530, 813, 814
General
ISO 4955 H15
EURONORM X6 CrNi 25 20 95-79
BS 310S16 5500
DIN/SEW X12 CrNi
25 21 1.4845 SEW470
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Page Last Modified: 10/04/06 11:34
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