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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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S31703 (317L)
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Introduction:
Molybdenum enhances the corrosion performance of stainless
steel in seawater and many other chemicals.
It will be noted that Euronorm only includes the low
carbon version and that the basic composition differs
from that of ASTM and JIS.
This 3.5%Mo type steel has even better resistance
to discolouration than 2.5%Mo (UNS S31600)
type in marine atmosphere exposures (Sweden). Similar
superiority exists to pitting in cool seawater (PREN
about 31), but risk of crevice attack still exists.
Metallurgy:
This steel, with 3.5%Mo is part of a series
with nominally 2.25, 2.75, 3.5, 4.5 and 6.5% Mo.
Conditions where the steels are not quickly taken
through the temperature range 900-500°C - eg.
slow cooling or large section heat treatments, high
heat input welding, service exposures - can allow
carbide precipitation and increased risk of embrittling
sigma formation in high Mo steels. Consideration should
be given to low carbon grades and to rapid cooling.
Composition:
| Element |
Minimum
(%) |
Maximum
(%) |
| Chromium |
18.00 |
20.00 |
| Nickel |
11.00 |
15.00 |
| Molybdenum |
3.00 |
4.00 |
| Nitrogen |
- |
0.10 |
| Manganese |
- |
2.00 |
| Carbon |
- |
0.03 |
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Similiar Specifications:
ISO 683/13 24
17.5-19.5%Cr, 14-17%Ni, 3-4%Mo, <2%Mn, <0.03%C
EURONORM X2 CrNiMo 18
16 4
17.5-19.5%Cr, 14.0-17.0%Ni, 3.0-4.0%Mo, <2.0%Mn,
<0.030%C
ASTM UNS S31703 317L
18-20%Cr, 11-15%Ni, 3.0-4.0%Mo, <0.10%N, <2.0%Mn,
<0.03%C
BS 317S12
17.5-19.5%Cr, 14-17%Ni, 3-4%Mo, <2%Mn, <0.03%C
DIN X2
CrNiMo 18 16 4 1.4438
17.5-19.5%Cr, 14-17%Ni, 3-4%Mo, <2%Mn, <0.03%C
JIS SUS 317L
18-20%Cr, 11-15%Ni, 3-4%Mo, <2%Mn, <0.03%C
Applications:
Power station condensers.
Chemical tankers.
Dyeing equipment.
Chemical, textile, paper industries.
Product Forms:
Plate,sheet
& strip
EURONORM X2
CrNiMo 18 16 4 88-86/2, 88-86/3
ASTM UNS S31703
317L 167, 240, 480
BS 317S12 1449/2
DIN X2
CrNiMo 18 16 4 1.4438
17440, 17441
JIS SUS 317L 4304, 4305, 4307
Bar & long products
EURONORM X2
CrNiMo 18 16 4 88-86/1
DIN X2
CrNiMo 18 16 4 1.4438
17440
JIS SUS 317L 4303
Forgings & others
EURONORM X2
CrNiMo 18 16 4 88-86/1
ASTM UNS S31703
317L 182, 403, 744
DIN X2
CrNiMo 18 16 4 1.4438
17440
JIS SUS 317L 4319
Tube and/or pipe
JIS SUS 317L 3463, 3459
ASTM UNS S31703
317L 213, 249, 450, 778
Pipe
ASTM UNS S31703
317L 312, 530, 813, 814
General
ISO 683/13 24
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Page Last Modified: 7/04/06 17:55
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