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X15 CrNiSi 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 |
- |
0.20 |
| Silicon |
1.50 |
2.50 |
|
Similiar Specifications:
ISO 2604 68
24-26%Cr, 19-23%Ni, <2%Mn, <0.15%C,
<1.5%Si
ISO 4955 H16
24-26%Cr, 19-22%Ni, <2%Mn, <0.20%C, 1.5-2.5%Si
EURONORM X15 CrNiSi 25 20
24-26%Cr, 19-22%Ni, <2%Mn, <0.20%C, 1.5-2.5%Si
ASTM UNS S31000 310
24-26%Cr, 19-22%Ni, <2%Mn, <0.25%C, <1.5%Si
BS 310S31
24-26%Cr, 19-22%Ni, <2%Mn, <0.15%C, <1.5%Si
DIN/SEW X15 CrNiSi 25 20 1.4841
24-26%Cr, 19-22%Ni, <2%Mn, <0.20%C, 1.5-2.5%Si
JIS SUS 310TP and 310TB
24-26%Cr, 19-22%Ni, <2%Mn, <0.15%C, <1.5%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 and Strip
ASTM UNS S31000
310 167, 480
BS 310S31 1449/2
Bar and Long Products
ASTM UNS S31000
310 276, 484
BS 310S31 970/1
Forgings and Others
ISO 2604 /1 F68
ASTM UNS S31000
310 314, 373, 484, 182, 403
BS 310S31 970/1, 1503
Tube and/or Pipe
ISO 2604 /2 TS68
JIS SUS 310TP and 310TB 3463, 3459
ASTM UNS S31000
310 213, 249, 450, 511, 554, 632, 778
Pipe
ASTM UNS S31000
310 312, 358, 409, 530, 813, 814
General
ISO 4955 H16
EURONORM X15 CrNiSi 25 20 95-79
DIN/SEW X15 CrNiSi 25
20 1.4841 SEW470
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Page Last Modified: 10/04/06 11:08
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