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| Mailing Address |
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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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S31640 (316Nb)
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Introduction:
This is one of the family of 17%Cr 12-13%Ni steels
containing between 2 and 3% Mo (S316xx series). This
is the standard grade used where specific attributes
of other members of the family are not necessary -
eg. no likelihood of IGC caused by welding.
After 18Cr10Ni (304xx) type steels, these 17Cr12NiMo
(316xx) grades are the most widely used austenitics.
In the damp industrial or coastal atmospheres of Europe,
they perform better than 18Cr10Ni (304xx) and ferritic
grades. In low temperature seawater they offer limited
resistance to pitting but are susceptible to crevice
attack (mean
PREN about 25-27). Their short and long-time properties
at elevated temperatures are also superior to those
of comparable 18Cr10Ni grades.
Metallurgy:
Conditions where the steels are not quickly
taken through the temperature range 900-500°C
(eg. slow cooling, heat-treatment, service exposure,
high heat input welding ) can allow precipitation
of chromium carbides and sometimes embrittling sigma
formation.
Where sensitization to intergranular corrosion around
these carbides is unacceptable, consideration should
be given to the low carbon (0.03%C max) grades and
to those stabilized with either Ti or Nb.
Composition:
| Element |
Minimum
(%) |
Maximum
(%) |
| Chromium |
16.00 |
18.00 |
| Nickel |
10.00 |
14.00 |
| Molybdenum |
2.00 |
3.00 |
| Nitrogen |
- |
0.10 |
| Manganese |
- |
2.00 |
| Carbon |
- |
0.08 |
| Niobium |
10
x C |
1.10 |
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Similiar Specifications:
ISO 683/13 23
16.5-18.5%Cr, 11-14%Ni, 2.0-2.5%Mo, <2%Mn,
<0.08%C, 10 x C-1.0%Nb
EURONORM X6 CrNiMoNb
17 12 2
16.5-18.5%Cr, 10.5-13.5%Ni, 2.0-2.5%Mo, <2.0%Mn,
<0.08%C, (10 x %C)-1.0%Nb
ASTM UNS S31640 316Nb
16-18%Cr, 10-14%Ni, 2.0-3.0%Mo, <0.10%N, <2.0%Mn,
<0.08%C, 10 x C-1.1%Nb
DIN X6
CrNiMoNb 17 12 2 1.4580
16.5-18.5%Cr, 10.5-13.5%Ni, 2.0-2.5%Mo, <2%Mn,
<0.08%C, 10 x C-1.0%Nb
Applications:
Architectural cladding, doors, windows and fittings
Street furniture
Offshore modules
Tanks and piping of chemical tankers
Production, storage and land-based transport of chemicals,foods and beverages
Pharmaceutical, synthetic fibre, paper and textile
industries
Pressure vessels, cryogenic equipment, high temperature
plant.
Product Forms:
Plate,sheet & strip
ASTM UNS S31640
316Nb 167, 240, 480
DIN X6
CrNiMoNb 17 12 2 1.4580
17440
Bar & long products
EURONORM X6
CrNiMoNb 17 12 2 88-86/1
ASTM UNS S31640
316Nb 276, 479, 484
DIN X6
CrNiMoNb 17 12 2 1.4580
17440
Forgings & others
EURONORM X6
CrNiMoNb 17 12 2 88-86/1
ASTM UNS S31640
316Nb 314
DIN X6
CrNiMoNb 17 12 2 1.4580
17440
Tube and/or pipe
DIN X6
CrNiMoNb 17 12 2 1.4580
17458
Pipe
ASTM UNS S31640
316Nb 312
General
ISO 683/13 23
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Page Last Modified: 7/04/06 17:53
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