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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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1.4948
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Introduction:
Stainless steels not only resist many corrodents near
ambient temperatures, but are successfully used at
elevated temperatures for their relatively high strength
and their ability to resist scaling and attack from
air and other high temperature media.
This grade has an intentionally controlled carbon
content of 0.04-0.10% which is the converse of the
low carbon grades (UNS S30403;
X2 CrNi 18 10) preferred
for welded components used in corrodents at near-ambient
temperatures. The extra carbon increases creep and
stress-rupture strength at 550-700°C. Prolonged
exposure of unstabilized stainless steels above 400°C
may reduce their corrosion-resistance. Such steels
are also designated X 7 CrNi 18 9 (ISO) and X 6 CrNi
18 11 (DIN).
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.
Increasing the carbon content produces precipitates
which reduce tendency of the steel to creep at high
temperatures.
Composition:
| Element |
Minimum
(%) |
Maximum
(%) |
| Chromium |
17.00 |
19.00 |
| Nickel |
8.00 |
11.00 |
| Manganese |
- |
2.00 |
| Carbon |
0.04 |
0.10 |
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Similiar Specifications:
ISO 2604 48
17-19%Cr, 8-12%Ni, <2%Mn, 0.04-0.09%C
ISO 4955 X7 CrNi 18 9
17-19%Cr, 8-11%Ni, <2%Mn, 0.04-0.10%C
ASTM UNS S30409 304H
18-20%Cr, 8-10.5%Ni, <2%Mn, 0.04-0.10%C
BS 304S51
17-19%Cr, 8-11%Ni, <2%Mn, 0.04-0.10%C
DIN X6 CrNi 18 11 1.4948
17-19%Cr, 10-12%Ni, <2%Mn, 0.04-0.08%C
JIS SUS F 304H
18-20%Cr, 8-11%Ni, <2%Mn, 0.04-0.10%C
Applications:
Boilers, pressure vessels, condensers and refinery
equipment as plate, sheet, bar, tube, pipe and
fittings. The design codes in ASME II and BS 5500 can apply
to these applications.
Other heat-resisting components operating up to about
800°C.
Product Forms:
Plate, Sheet and Strip
ISO 2604 /4 P48
ASTM UNS S30409
304H 240, 480
BS
304S51 1501/3
Bar and Long Products
ASTM UNS S30409
304H 479, 484
BS
304S51 1502Forgings and Others
ISO 2604 /1 F48
ASTM UNS S30409
304H 182, 403
BS
304S51 1503
JIS SUS F 304H 3214, 43199
Tube and/or Pipe
ISO 2604 /2 TS48
BS
304S51 3059, 3605
JIS SUS F 304H 3463, 3459
ASTM UNS S30409
304H 213, 249, 271, 450
Pipe
ASTM UNS S30409
304H 312, 358, 376, 430, 530, 813, 814
General
ISO 4955 X7 CrNi 18 9
S 304S51 5500
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Page Last Modified: 7/04/06 17:30
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