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S32100 (321)
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Introduction:
The older and higher carbon 18Cr, 8-10Ni type steels
are prone to intergranular attack in weld zones and
slower-cooling sections. This steel avoids such attack
by stabilization with titanium. It could have equally
been designated 304Ti. However, the advent of AOD/VOD
refining allowing easier production of less-sensitizable
low-carbon
(0.03% max) grades has lessened the need for this
stabilized steel.
The corrosion behaviour of this alloy in natural environments
is very similar to the UNS S30400
and S30403 alloys. Architecturally,
it may not be adequate for near-industrial or coastal
locations in Europe.
Satisfactory in many low-chloride waters, it is prone
to pitting or crevice corrosion in seawater. Water
treatment, galvanic protection and deaeration can
influence the performance.
Metallurgy:
The precipitation of chromium carbides in
higher-carbon steels locally depletes the steel of
chromium, thereby sensitizing the alloy to corrosion
by intergranular attack. Titanium has a stronger affinity
for carbon than chromium and additions exceeding 5xC
ensures the
formation of titanium carbides and thus minimizing
chromium depletion.
Composition:
| Element |
Minimum
(%) |
Maximum
(%) |
| Chromium |
17.00 |
19.00 |
| Nickel |
9.00 |
12.00 |
| Manganese |
- |
2.00 |
| Carbon |
- |
0.08 |
| Titanium |
5
x (C+N) |
0.70 |
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Similiar Specifications:
ISO 2604 53
ISO 683/13 15
17-19%Cr, 9-12%Ni, <2%Mn, <0.08%C, 5 x C-0.8%Ti
EURONORM X6
CrNiTi 18 10
17.0-19.0%Cr, 9.0-12.0%Ni, <2.0%Mn, <0.08%C,
(5 x %C)-0.80%Ti
ASTM UNS S32100 321
17-19%Cr, 9-12%Ni, <2.0%Mn, <0.08%C, 5 x (C+N)-0.70%Ti
BS 321S31
17-19%Cr, 9-12%Ni, <2%Mn, <0.08%C, 5 x C-0.8%Ti
DIN X6
CrNiTi 18 10 1.4541
17-19%Cr, 9-12%Ni, <2%Mn, <0.08%C, 5 x C-0.8%Ti
JIS SUS 321
17-19%Cr, 9-13%Ni, <2%Mn, <0.08%C, >5 x C%Ti
Applications:
Because of competition from the low-carbon grades,
applications for this alloy are now more
confined to heat resisting components for power stations,
furnaces, etc, and to heavier sectioned
welded plant for nearer
ambient temperature use. Other uses are similar to
the S30400
stainless
steels.
Product Forms:
Plate,sheet
& strip
ISO 2604 /4 P53
EURONORM X6
CrNiTi 18 10 88-86/2, 88-86/3, 141-79
ASTM UNS S32100
321 167, 240, 480
BS 321S31 1449/2, 1501/3
DIN X6
CrNiTi 18 10 1.4541 17440,
17441
JIS SUS 321 4304, 4305, 4307
Bar
& long products
EURONORM X6
CrNiTi 18 10 88-86/1
ASTM UNS S32100
321 276, 479, 484
BS 321S31 970/1, 1502
DIN X6
CrNiTi 18 10 1.4541 17440
JIS SUS 321 4303, 4308, 4318, 4311
Forgings & others
ISO 2604 /1 (F53)
EURONORM X6
CrNiTi 18 10 88-86/1
ASTM UNS S32100
321 314, 473, 484, 182, 403, 744
BS 321S31 970/1, 1503
DIN X6
CrNiTi 18 10 1.4541 17440
JIS SUS 321 3214, 4319
Tube and/or pipe
ISO 2604 /2 (TS53), /5 TW53
BS 321S31 3605
DIN X6
CrNiTi 18 10 1.4541 17455,
17456, 17457, 17458
JIS SUS 321 3463, 3459
ASTM UNS S32100
321 213, 249, 269, 271, 450, 511, 554, 632, 778
Pipe
ASTM UNS S32100
321 312, 358, 376, 409, 430, 530, 813, 814
General
ISO 683/13 15
BS 321S31 5500
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Page Last Modified: 7/04/06 17:56
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