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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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1.4371
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Introduction:
High manganese nitrogen-containing austenitic steels
are about 10-20% stronger than the widely used stainless
steels of the S30400 and
similar types. Their resistance to atmospheric corrosion,
pitting corrosion, some oxidizing chemicals and to
high temperature scaling have been reported as sometimes
inferior to the popular Cr-Ni grades. Such factors
plus added production and fabrication costs have negated
long-term market substitution based on the relative
price of Mn and Ni. The Euronorm X
3 CrMnNiN 18 8 7 has lower carbon (0.04% Cmax)
and higher nickel (6.5-8.5%Ni) contents compared with
0.15%Cmax and 4-6%Ni in the steels similar to S20200.
The lower carbon content reduces the susceptibility
to intergranular corrosion after welding.
Metallurgy:
Manganese, like nickel, is used to produce the tough,
ductile and formable austenite structure, but is only
half as effective. Thus, S20200
and the similar grade S20100 contain typically 4-5%Ni
and 6-9%Mn compared with the 7-10%Ni of S30400
and similar types. The following values for section
up to 20mm thickness demonstrate the strengthening
effect of Mn (MPa).
| |
X 3 CrMnNiN |
X 2 CrNiN |
| |
18 8 7 |
18 10 |
| 0.2%
Proof stress (min) |
330 |
270 |
| 1.0%
Proof stress (min) |
360 |
305 |
| Tensile
strength |
650-850 |
560-760 |
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Composition:
| Element |
Minimum
(%) |
Maximum
(%) |
| Chromium |
17.00 |
19.00 |
| Nickel |
6.00 |
8.00 |
| Nitrogen |
0.15 |
0.25 |
| Manganese |
6.50 |
8.50 |
| Carbon |
- |
0.04 |
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Similiar Specifications:
ISO 683/13 A-3
17-19%Cr, 4-6%Ni, 0.05-0.25%N,
7.5-10.5%Mn, <0.15%C
EURONORM X3 CrMnNiN 18
8 7
17-19%Cr, 6-8%Ni, 0.15-0.25%N, 6.5-8.5%Mn, <0.04%C
ASTM UNS S20200 202
17-19%Cr, 4-6%Ni, <0.25%N, 7.5-10%Mn, <0.15%C
BS 284S16
16.5-18.5%Cr, 4-6.5%Ni, 0.15-0.25%N, 7-10%Mn, <0.07%C
DIN X3 CrMnNiN 18 8 5 1.4371
17-19%Cr, 4-6%Ni, 7.5-10.5%Mn, <0.15%C
JIS SUS 202
17-19%Cr, 4-6%Ni, <0.25%N, 7.5-10%Mn, <0.15%C
Applications:
Strip Products
Fastening bands and strapping, clamps.
Holloware
Machined parts and forgings.
Product Forms:
Plate, Sheet and Strip
EURONORM X3
CrMnNiN 18 8 7 88-86/3
ASTM UNS S20200
202 240, 666
BS 284S16 1449/2
JIS SUS 202 4304, 4305, 4307
Bar and Long Products
ASTM UNS S20200
202 276
JIS SUS 202 4303
Forgings and Others
ASTM UNS S20200
202 473
Tube
ASTM UNS S20200
202 213, 249
General
ISO 683/13 A-3
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Page Last Modified: 7/04/06 17:28
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