Duplex and super duplex pipes
Duplex stainless steels (and every duplex tube) have roughly twice the strength compared to austenitic stainless steels and also improved resistance to localized corrosion, particularly pitting, crevice corrosion and stress corrosion cracking. They are characterized by high chromium (19–32%) and molybdenum (up to 5%) and lower nickel contents than austenitic stainless steels.
The properties of duplex stainless steels (and every duplex pipe) are achieved with an overall lower alloy content than similar-performing super-austenitic grades, making their use cost-effective for many applications. Duplex tubes in this grades are characterized into groups based on their alloy content and corrosion resistance.
Dimensions - duplex pipe and super duplex pipe:
- diameters from 4,0 mm to 219,0 mm
- walls thickness from 0,3 mm to 12,7 mm
Steel grades - duplex pipe and super duplex pipe:
| X2CrNiMoN22-5-3 | |
| Euro standard: | 1.4462 |
| Standard: | EN 10088 - 2 : 2005 Stainless steels. Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes EN 10088 - 3 : 2005 Stainless steels. Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes |
| Classification: | Austenitic-ferritic stainless steels - standard grade |
| Steel grade equivalent | USA: S31803 / S32205 France (AFNOR): Z3CND22-05Az Sweden (SS): 2377 Great Britain (BS): 318S13 Russia (GOST): 03KH23N6 Another: SAF2205 |
| C | Si | Mn | Ni | P | S | Cr | Mo | N |
| max 0,03 | max 1,00 | max 2,00 | 4,50-6,50 | max 0,035 | max 0,015 | 21,00-23,00 | 2,30-3,50 | 0,10-0,22 |
| Gatunek: | X2CrNiMoN25-7-4 |
|---|---|
| Euro standard: | 1.4410 |
| Standard: | EN 10088 - 2 : 2005 Stainless steels. Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes EN 10088 - 3 : 2005 Stainless steels. Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes |
| Classification: | Austenitic-ferritic stainless steels - special grade |
| Steel grade equivalent | USA: S32750 France (AFNOR): Z3CND25-06Az Sweden (SS): 2328 Another: F53 |
Skład chemiczny gatunku X2CrNiMoN25-7-4 (1.4410)
| Si | Mn | P | S | N | Cr | Mo | Ni | |
| max 0,030 | max 1 | max 2 | max 0,035 | max 0,015 | 0,20-0,35 | 24,00-26,00 | 3,00-4,50 | 6,00-8,00 |
| Gatunek: | X2CrNiMoCuWN25-7-4 |
|---|---|
| Euro standard: | 1.4501 |
| Standard: | EN 10088 - 2 : 2005 Stainless steels. Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes EN 10088 - 3 : 2005 Stainless steels. Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes |
| Classification: | Austenitic-ferritic stainless steels - special grade |
| Steel grade equivalent | USA : S32760 Another: F55 |
| C | Si | Mn | Ni | P | S | Cr | Mo | W | N | Cu |
|---|---|---|---|---|---|---|---|---|---|---|
| max 0,03 | max 1,00 | max 1,00 | 6,00-8,00 | max 0,035 | max 0,015 | 24,00-26,00 | 3,00-4,00 | 0,5-1,0 | 0,2-0,3 | 0,5-1,0 |
| Gatunek: | X2CrNiN23-4 |
|---|---|
| Euro standard: | 1.4362 |
| Standard: | EN 10088 - 2 : 2005 Stainless steels. Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes EN 10088 - 3 : 2005 Stainless steels. Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes |
| Classification: | Austenitic-ferritic stainless steels - standard grade |
| Steel grade equivalent | USA: S32304 France (AFNOR): Z3CN23-04Az Sweden (SS): 2327 Russia (GOST): 03KH23N6 |
| C | Si | Mn | Ni | P | S | Cr | Mo | N | Cu |
|---|---|---|---|---|---|---|---|---|---|
| max 0,03 | max 1,00 | max 2,00 | 3,50-5,50 | max 0,035 | max 0,015 | 22,00-24,00 | 0,10-0,60 | 0,05-0,20 | 0,10-0,60 |
X3CrNiMoN27-5-2 (1.4460)
| Gatunek: | X3CrNiMoN27-5-2 |
|---|---|
| Euro standard: | 1.4460 |
| Standard: | EN 10088 - 3 : 2005 Stainless steels. Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes |
| Classification: | Austenitic-ferritic stainless steels-standard grades |
| Steel grade equivalent | USA : 329, UNS S32900 |
| C | Si | Mn | P | S | N | Cr | Mo | Ni |
|---|---|---|---|---|---|---|---|---|
| max 0,05 | max 1,00 | max 2,00 | max 0,035 | max 0,015 | 0,05-0,20 | 25,00-28,00 | 1,30-2,00 | 4,50-6,50 |
Grades - duplex pipe and super duplex pipe:
1.4462, S31803/S32205, X2CrNiMoN22 5 3, F51-F60, SAF2205
1.4410, S32750, X2CrNiMoN25 7 4, F53, Alloy 2507
1.4501, X2CrNiMoCuWN25 7 4, S32760, F55
and others to be agreed
Norms - duplex tube and super duplex tube:
ASTM A213/A213M, ASME SA213/SA213M
ASTM A312/A312M, ASME SA312/SA312M
ASTM A376/A376M, ASME SA376/SA376M
ASTM A789/A789M, ASME SA789/SA789M
ASTM A790/A790M, ASME SA790/SA790M
DIN 17456, DIN 17458
EN 10216-5
+Vd TUV 418
and others to be agreed
Tolerances - duplex tube and super duplex tube:
EN ISO 1127, DIN 2462
EN 10305-1, DIN 2391
and others to be agreed
Duplex tube:
Duplex pipes in stainless steels have a mixed microstructure of austenite and ferrite, the aim usually being to produce a 50/50 mix, although in commercial alloys the ratio for duplex tubes may be 40/60.
Super duplex tube:
Super duplex is a duplex stainless steel where pitting corrosion equivalent (PRE) > 40, and PRE = %Cr (Chromium) + 3.3x(%Mo Molybdenum + 0.5x% W Wolfram) + 16x%N Nitrogen.
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