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Here are some typical compositions of duplex stainless steels:
| Grade | EN No/UNS | Type | Approx Composition | ||||||
| Cr | Ni | Mo | N | Mn | W | Cu | |||
| 2101 LDX | 1.4162/ S32101 | Lean | 21.5 | 1.5 | 0.3 | 0.22 | 5 | - | - |
| DX2202 | 1.4062/ S32202 | Lean | 23 | 2.5 | 0.3 | 0.2 | 1.5 | - | - |
| RDN 903 | 1.4482/ S32001 | Lean | 20 | 1.8 | 0.2 | 0.11 | 4.2 | - | - |
| 2304 | 1.4362/ | Lean | 23 | 4.8 | 0.3 | 0.10 | - | - | - |
| 2205 | 1.4462/ S31803/ S32205 | Standard | 22 | 5.7 | 3.1 | 0.17 | - | - | - |
| 2507 | 1.4410/ S32750 | Super | 25 | 7 | 4 | 0.27 | - | - | - |
| Zeron 100 | 1.4501/ S32760 | Super | 25 | 7 | 3.2 | 0.25 | - | 0.7 | 0.7 |
| Ferrinox 255/ Uranus 2507Cu | 1.4507/ S32520/ S32550 | Super | 25 | 6.5 | 3.5 | 0.25 | - | - | 1.5 |
In some of the recently developed grades, nitrogen and manganese are used together to bring the nickel content to very low levels. This has a beneficial effect on price stability.
At present, we are still very much in the development phase of duplex steels. Therefore, each mill is promoting its own particular brand. It is generally agreed that there are too many grades. However, this is likely to continue until the “winners” emerge.
Corrosion Resistance of Duplex Steels
The range of duplex steels allows them to be matched for corrosion resistance with the austenitic and ferritic steel grades. There is no single measure of corrosion resistance. However, it is convenient to use the Pitting Resistance Equivalent Number (PREN) as a means of ranking the grades.
PREN = %Cr + 3.3 x %Mo + 16 x %N
The following table shows how the duplex steels compare with some austenitic and ferritic grades.
| Grade | EN No/UNS | Type | Typical PREN |
| 430 | 1.4016/ S43000 | Ferritic | 18 |
| 304 | 1.4301/ S30400 | Austenitic | 19 |
| 441 | 1.4509/ S43932 | Ferritic | 19 |
| RDN 903 | 1.4482/ S32001 | Duplex | 22 |
| 316 | 1.4401/ S31600 | Austenitic | 24 |
| 444 | 1.4521/ S44400 | Ferritic | 24 |
| 316L 2.5 Mo | 1.4435 | Austenitic | 26 |
| 2101 LDX | 1.4162/ S32101 | Duplex | 26 |
| 2304 | 1.4362/ S32304 | Duplex | 26 |
| DX2202 | 1.4062/ S32202 | Duplex | 27 |
| 904L | 1.4539/ N08904 | Austenitic | 34 |
| 2205 | 1.4462/ S31803/ S32205 | Duplex | 35 |
| Zeron 100 | 1.4501/ S32760 | Duplex | 41 |
| Ferrinox 255/ Uranus 2507Cu | 1.4507/ S32520/ S32550 | Duplex | 41 |
| 2507 | 1.4410/ S32750 | Duplex | 43 |
| 6% Mo | 1.4547/ S31254 | Austenitic | 44 |
Duplex Stainless Steel Investment Cast Alloy Chemical Compositions
| Duplex Stainless Steel Alloy Chemistry | ||||||||||||
| Carbon Max | Manganese Max | Silicon Max | Chromium Min-Max | Nickel Min-Max | Molybdenum Min-Max | Phosphorous Max | Sulfur Max | Copper Min-Max | Iron | Other | Melting Range | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Alloy Type | ||||||||||||
| ASTM A890 Grade 1A (CD4MCu) | 0.04 | 1.00 | 1.00 | 24.5-26.5 | 4.75-6.00 | 1.75-2.25 | 0.040 | 0.040 | 2.75-3.25 | Bal. | 2630-2680 | |
| ASTM A890 Grade 4A (CD3MN) | 0.03 | 1.50 | 1.00 | 21.0-23.0 | 4.5- 6.5 | 2.5-3.5 | 0.040 | 0.020 | 1.00 Max | Bal. | N 0.10-0.30 | 2630-2680 |
Duplex Stainless Steel Investment Cast Alloy Properties
| Duplex Stainless Steel Alloy Properties | |||||||
| Condition | Tensile Strength | 0.2% Yield Strength | % Elongation Range (2.5 cm or 1") | Hardness RB Max | |||
|---|---|---|---|---|---|---|---|
| Alloy Type | English PSI | Metric MPa | English PSI | Metric MPa | |||
| ASTM A890 Grade 1A CD4MCu | Solution Annealed | 100,000 Min | 689 Min | 70,000 Min | 483 Min | 16% Min | 94Rb – 27Rc |
| ASTM A890 Grade 4A CD3MN | Solution Annealed | 90,000 Min | 621 Min | 60,000 Min | 414 Min | 25% Min | 90 Rb – 25Rc |
Mechanical Property values are for information only. They are determined from test bars and do not necessarily apply to castings.
Cross-Index of Various Alloy Designations For Duplex Stainless Steel Investment Cast Alloys
| Duplex Stainless Steel Alloy Cross-Index | ||
| Alloy or Type | AMS | Other Designation |
|---|---|---|
| CD4MCu | ASTM A890 Grade 1A | |
| CD3MN | ASTM A890 Grade 4A | |
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Origin Of Material
| Brand Name : We are Dealer, Distributor, Stockist, Stockholder and Supplier of Below Brand Products |
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| http://www.columbus.co.za : COLUMBUS in SOUTH AFRICA: Lean Duplex Steel - e.g. 2001/1.4482 / 2304/1.4362 / Standard duplex Steel e.g. 2205/1.4462. |
| http://www.sandmeyersteel.com: SANDMEYER STEEL ( USA & CANADA): Alloy 2205Duplex Stainless Steel Plates/ Alloy 2507 Duplex Stainless Steel Plate Manufacturers - |
| http://www.jindalstainless.com/ : JINDAL ( JSL INDIA ): Duplex Steel Sheet PlatesManufacturers --- |
| http://www.aalco.co.uk/: AALCO in UKStainless Steel Pipes Tubes Manufacturers -- |
| http://www.sail.co.in/: SALEM Productsin INDIA : Duplex Steel Sheet Plate Coils Manufacturers --- |
| http://www.specialsteelgroup.com/: SPECIAL STEEL LTD(UK): Duplex Stainless Steel Round Bar, Fastener Bolts Nuts & Flat Bar Manufacturers |
| http://www.pennstainless.com/: PENN STAINLESS( USA ) : Duplex Stainless Steel 2205& 2507 : Penn Stainless inventory now includes Duplex 2205 (UNS S32205 / S31803), in sheet, coil, plate, plate coil, round bar, processed flat bar and tubular products |
| http://www.nssmc.com/en/ : NIPPON STEEL & SUMITOMO METALS( JAPAN ) : Duplex Steel 2205& 2507 Sheet Plates Manufacturers --- |
| http://www.outokumpu.com/: OUTOKUMPU ( FINLAND & INDIA ) : Duplex Steel 2205 & 2507 Coil and sheet, Bar, Welded pipe & Plate Manufacturers --- |
| http://megamex.com/: MEGAMEX ( TEXAS USA ) : Mega Mex supplies LDX2101, 2205, Ferralium 255, Zeron 100 and 2507 in the form of plate, sheet, strip, bar, pipe, tubing, pipe fittings, flanges and weld wire. |
| http://www.schoeller-bleckmann.co.uk/: SCHOELLER BLECKMANN ENGLAND & DUBAI: Schoeller-Bleckmann (UK) is a major stockholder and distributor of Stainless Steel Tube, Pipe & Hollow Bar. |
| http://smt.sandvik.com/en-in/: SANDVIK ( SWEDEN & INDIA ) : Duplex stainless steels / Sandvik SAF 2507, Sandvik SAF 2707 HD, Sandvik SAF 3207 HD / TUBE, PIPE, FITTINGS AND FLANGES Manufacturers in SWEDEN |
| http://www.tiogapipe.com/: TIOGA ( USA ) : Duplex Steel Pipe 2205 S31803/ S32205, A790 / SA790, Duplex Steel 2205 S31803 / S32205 , A815 / SA815, A182 / SA182 Fittings, Duplex Flanges Duplex 2205 S31803 / S32205, A182 / SA182 Manufacturers in Houston |
| http://www.specialpipingmaterials.com/duplex/: SPECIAL PIPING MATERIAL ( UK, ENGLAND, SCOTLAND, SINGAPORE, USA, AUSTRALIA, DUBAI, BRAZIL ) : High quality exotic piping products from approved manufacturers : Seamless Duplex 2205 Pipe, Welded Super Duplex Pipe, Super Duplex (both S32760 and S32750 / 2507 Buttweld Fittings, Flanges, Forged Fittings Manufacturers |
| http://www.langleyalloys.com/ : Langley Alloys : Duplex Stainless Steels Products Manufacturers |
| http://www.rolledalloys.com/: Rolled Alloys, Inc: Duplex Stainless Steel Pipes TubesManufacturers |
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