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.
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 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 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.
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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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.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 --- |
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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 |
Products | Duplex Steel Flanges, 2205and 2507 Grades. |
Industry We Serve | Duplex Stainless Steel Flanges Supplied Oil & Gas Industry, Petrochemical Companies, Seashore Industries, Refinery, Petroleum Refineries, Oil Refining Industry, Beverage, Water Piping Systems, Acid & Chemical Plants, Pharmacy Industry etc.. |
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Industry We Serve | Heat exchangers Manufacturers & cooling pipes Manufacturers Industry. |
Country | More Then 1700 CLIENTS OFDuplex Stainless Steel Tubing in Kuwait, Peru, UK, Singapore, Poland, Iraq, Malaysia, Serbia, Turkey, Yemen, Australia, Lebanon, Oman, Srilanka, Egypt, Angola, Canada, Madagascar, Saudi Arabia, Indonesia, UAE, Italy, Jordan, USA, Brazil, Nigeria, South Africa, Mexico, New Zealand, Netherlands, Germany, Venezuela, Iran, Denmark, Spain, Bahrainetc.... |
Products | Duplex Steel Sheet & Plate |
Industry We Serve | storage tanks manufacturers, pharmaceutical or food processing Industry, pulp and paper industry (Duplex stainless steel plate USE: Duplex stainless steel plate is often used for storage tanks. High corrosion and erosion resistance is a must for storage tanks, whether the designer wants to prevent leakage during desalinization, avoid contamination in pharmaceutical or food processing, or store chips as well as black and white liquor for the pulp and paper industry.) |
Country | More Then 2800 CLIENTS OFDuplex Steel Plates., We Supplied Duplex Stainless Steel Plates in Kuwait, Peru, UK, Singapore, Poland, Iraq, Malaysia, Serbia, Turkey, Yemen, Australia, Lebanon, Oman, Srilanka, Egypt, Angola, Canada, Madagascar, Saudi Arabia, Indonesia, UAE, Italy, Jordan, USA, Brazil, Nigeria, South Africa, Mexico, New Zealand, Netherlands, Germany, Venezuela, Iran, Denmark, Spain, Bahrainetc.... |
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Products | Duplex Steel Sheet & Plate |
Industry We Serve | storage tanks manufacturers, pharmaceutical or food processing Industry, pulp and paper industry (Duplex stainless steel plate USE: Duplex stainless steel plate is often used for storage tanks. High corrosion and erosion resistance is a must for storage tanks, whether the designer wants to prevent leakage during desalinization, avoid contamination in pharmaceutical or food processing, or store chips as well as black and white liquor for the pulp and paper industry.) |
Country | More Then 2800 CLIENTS OFDuplex Steel Plates., We Supplied Duplex Stainless Steel Plates in Kuwait, Peru, UK, Singapore, Poland, Iraq, Malaysia, Serbia, Turkey, Yemen, Australia, Lebanon, Oman, Srilanka, Egypt, Angola, Canada, Madagascar, Saudi Arabia, Indonesia, UAE, Italy, Jordan, USA, Brazil, Nigeria, South Africa, Mexico, New Zealand, Netherlands, Germany, Venezuela, Iran, Denmark, Spain, Bahrainetc.... |
Products | Duplex Steel 2205& 2507 Bolts, Duplex Steel 2205& 2507 Washer, Duplex Steel 2205& 2507 Screws, Duplex Steel 2205& 2507 Nuts |
Industry We Serve | Duplex Steel Fasteners used in Oil & Gas Industry, Petrochemical, structural & mechanical |
Country | More Then 3200 CLIENTS OFDuplex Stainless Steel Fasteners in Kuwait, Peru, UK, Singapore, Poland, Iraq, Malaysia, Serbia, Turkey, Yemen, Australia, Lebanon, Oman, Srilanka, Egypt, Angola, Canada, Madagascar, Saudi Arabia, Indonesia, UAE, Italy, Jordan, USA, Brazil, Nigeria, South Africa, Mexico, New Zealand, Netherlands, Germany, Venezuela, Iran, Denmark, Spain, Bahrainetc.... |
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