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1.4311
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Introduction:
This steel has an economic balance of alloying elements
to ensure its good cold formability, corrosion resistance,
toughness and good mechanical properties without excessive
work-hardening. Its low carbon content improves its
resistance to sensitization and intergranular attack,
and the addition of nitrogen replaces the strength
which would have been provided by the carbon.
General corrosion characteristics are similar to S30400
/ X 5 CrNi 18 10. Stability
and toughness at cryogenic temperatures is high.
This alloy is worth consideration in designs where
rigidity is less important than reduction in wall
thickness or other dimensions. Design stress factors
in BS5500.1991 are some 30% higher than for the comparable
low carbon grade which does not contain nitrogen.
Metallurgy:
The overall composition of the S304xx type alloys
balance the ferrite-forming elements (Cr,Mo,Si) with
sufficient Ni,Mn,C and N to promote stable austenite
and prevent martensite formation.
The older and higher carbon 18Cr, 8-10Ni type steels
are prone to sensitization and intergranular attack
in weld zones and slower-cooling sections. However,
the advent of AOD/VOD refining allowed easier production
of this less-sensitizable low-carbon (0.03% max) grade.
Composition:
| Element |
Minimum
(%) |
Maximum
(%) |
| Chromium |
17.00 |
19.00 |
| Nickel |
8.50 |
11.50 |
| Nitrogen |
0.12 |
0.22 |
| Manganese |
- |
2.00 |
| Carbon |
- |
0.03 |
|
Similiar Specifications:
ISO 683/13 10N
17-19%Cr, 8.5-11.5%Ni, 0.12-0.22%N, <2%Mn,<0.03%C
EURONORM X2 CrNiN 18 10
17.0-19.0%Cr, 8.5-11.5%Ni, 0.12-0.22%N, <2.0%Mn,
<0.03%C
ASTM UNS S30453 304LN
18-20%Cr, 8-12%Ni, 0.10-0.16%N, <2.0%Mn, <0.03%C
BS 304S61
17-19%Cr, 8.5-11.5%Ni, 0.12-0.22%N, <2%Mn,<0.03%C
DIN X2 CrNiN 18 10 1.4311
17-19%Cr, 8.5-11.5%Ni, 0.12-0.22%N, <2%Mn,<0.03%C
JIS SUS 304LN
17-19%Cr, 8.5-11.5%Ni, 0.12-0.22%N, <2%Mn,<0.03%C
Applications:
Heavier sectioned pressure vessels, tanks, tube, pipe,
bars, fasteners, tube and pipe fittings.
Product Forms:
Plate, Sheet and Strip
EURONORM X2
CrNiN 18 10 88-86/2, 88-86/3, 141-79
ASTM UNS S30453
304LN 167, 240, 480, 666
BS 304S61 1501/3
DIN X2
CrNiN 18 10 1.4311 17440, 17441
JIS SUS 304LN 4304, 4305, 4307
Bar and Long Products
EURONORM X2
CrNiN 18 10 88-86/1
ASTM UNS S30453
304LN 276, 479, 484
DIN X2
CrNiN 18 10 1.4311 17440
JIS SUS 304LN 4303, 4308, 4318
Forgings and Others
EURONORM X2
CrNiN 18 10 88-86/1, 119-74
ASTM UNS S30453
304LN 182, 403
DIN X2
CrNiN 18 10 1.4311 17440
Tube and/or Pipe
DIN X2
CrNiN 18 10 1.4311 17455, 17456, 17457, 17458
ASTM UNS S30453
304LN 213, 249, 450, 688
Pipe
ASTM UNS S30453
304LN 312, 358, 376, 530, 813, 814
General
ISO 683/13 10N
BS 304S61 5500
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Page Last Modified: 7/04/06 17:16
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