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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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S34709 (347H)
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Introduction:
These 0.04 to 0.10% carbon steels have an intentionally
controlled minimum carbon content to ensure consistent
creep or stress/rupture properties at elevated temperatures.
Stabilization with niobium minimizes any associated
sensitization and its effects on corrosion resistance.
ISO 2604 includes the comparable steel No. 56, but
the steel with similar alloy contents in Euronorm
95-79: Heat-Resisting Steels (X 10 CrNiNb 18 10) specifies
0.12%C maximum but no essential minimum.
Temperature limits for low stress service/scaling
in air is about 850°C. Below about 550° there
are little or no differences between the design stresses
permitted for the 0.08%C max and the 0.04-0.10%C grades
ASME II and BS5500-1991. At higher temperatures, design
stresses for the controlled carbon grades are superior.
Metallurgy:
The overall composition of the 18Cr,8-10Ni
type steels balances the ferrite-forming elements
(Cr,Mo,Si) with sufficient Ni,Mn,C and N to promote
stable austenite and prevent martensite formation.
Increasing the carbon content produces precipitates
that impede creep at high temperatures. High temperature
service and other thermal cycles in the 400-900°C
range may produce chromium carbides and sensitization
to intergranular corrosion. Stabilising additions
minimise these effects.
Composition:
| Element |
Minimum
(%) |
Maximum
(%) |
| Chromium |
17.00 |
19.00 |
| Nickel |
9.00 |
13.00 |
| Manganese |
- |
2.00 |
| Carbon |
0.04 |
0.10 |
| Niobium |
8
x C |
1.00 |
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Similiar Specifications:
ISO 2604 56
15-17%Cr, 12-14%Ni, <2%Mn, 0.04-0.10%C, 10 x C-1.2%Nb
ASTM UNS S34709 347H
17-19%Cr, 9-13%Ni, <2%Mn, 0.04-0.10%C, 8 x C-1.0%Nb
BS 347S51
17-19%Cr, 9-13%Ni, <2%Mn, 0.04-0.10%C, 10 x C-1.2%Nb
JIS SUS 347HTP
17-20%Cr, 9-13%Ni, <2%Mn, 0.04-0.10%C, 8 x C-1.0%Nb
Applications:
Heavy thickness welded components operating at high
temperatures.
Furnace components.
Power station equipment - superheater tubes, steam
pipes.
Gas turbine parts.
Exhaust systems and heaters.
Bellow, gaskets.
Process plant.
Product Forms:
Plate,sheet
& strip
ISO 2604 /4 P56
ASTM UNS S34709
347H 240
BS 347S51
1501/3
Bar & long products
ASTM UNS S34709
347H 479
BS 347S51
1502
Forgings & others
ISO 2604 /1 F56
ASTM UNS S34709
347H 182, 403
BS 347S51
1503
JIS SUS 347HTP 3214, 4319
Tube and/or pipe
ISO 2604 /2 TS56
BS 347S51
3059, 3605
JIS SUS 347HTP 3463, 3459
ASTM UNS S34709
347H 213, 249, 271, 450
Pipe
ASTM UNS S34709
347H 312, 376, 430, 530, 813, 814
General
BS 347S51
5500
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Page Last Modified: 7/04/06 17:58
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