Super duplex stainless steel round bars and rods are a type of stainless steel alloy that contains high levels of chromium, molybdenum, and nitrogen, making them highly resistant to corrosion, stress corrosion cracking, and pitting. Super duplex stainless steel round bars are ideal for use in harsh environments such as offshore oil rigs, chemical processing plants, and desalination plants.
At Om Steel, we offer a range of super duplex stainless steel round bars and rods grades, including S32750 and S32760, each with its own set of mechanical properties and corrosion resistance. Our round bars are available in a range of sizes and lengths to meet your specific needs.
In addition to their superior corrosion resistance, super duplex stainless steel round bars also offer high strength and durability, making them ideal for use in heavy-duty applications. They also have excellent machinability and weldability, making them easy to fabricate and install.
ASTM A479 Super Duplex Stainless Steel Round Bars and Rods Equivalent Grades
The most commonly used standard for duplex steel round bars is ASTM A479. It specifies the chemical composition, mechanical properties, and other relevant requirements for stainless steel bars and shapes for use in boilers and pressure vessels.
UNS S31803/S32205
These grades are also known as F51/F60 or 2205 duplex stainless steel. They have a high chromium content (22%) and moderate nickel content (5%), which provides excellent corrosion resistance in various environments such as seawater, acidic solutions, and chloride-containing media.
UNS S32750
This grade is also known as F53 or 2507 super duplex stainless steel. It has a higher chromium (25%) and molybdenum (4%) content than S31803/S32205, which enhances its resistance to pitting corrosion caused by chlorides and other halide ions.
UNS S32760
This grade is also known as F55 or Zeron 100 super duplex stainless steel. It has a higher chromium (25%), molybdenum (3%), tungsten (1%), and copper (0.5%) content than S32750, which offers superior corrosion resistance in aggressive environments such as sulfuric acid solutions.
Properties of Equivalent Grades
Each grade of duplex steel round bar has unique properties that make it suitable for specific applications.
Corrosion resistance
Duplex steel round bars have excellent corrosion resistance due to their high chromium and molybdenum content. They can withstand pitting, crevice, and stress corrosion cracking in various environments.
Strength
Duplex steel round bars have higher strength than austenitic stainless steels due to their duplex microstructure. They exhibit good ductility and toughness even at low temperatures.
Weldability
Duplex steel round bars are weldable using conventional welding methods such as gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW). However, care should be taken to avoid excessive heat input that may cause intermetallic phases and reduce the corrosion resistance.
Types of Super Duplex Stainless Steel Round Bars and Rods Available
Super Duplex Round Bar
The most common type of super duplex steel round bar is the standard super duplex round bar. This type of bar is made from a combination of austenitic and ferritic stainless steels, which gives it superior strength and corrosion resistance. It is commonly used in applications such as offshore oil rigs, chemical processing plants, and seawater desalination plants.
Super Duplex S32750 Round Bars
Super duplex S32750 round bars are a specific type of super duplex steel that contains high levels of both chromium and molybdenum. This gives them exceptional resistance to pitting and crevice corrosion, making them ideal for use in harsh environments where other materials may fail. They are often used in applications such as chemical processing plants, oil refineries, and offshore drilling rigs.
ASTM A276 Super Duplex S32750 Round Bars
ASTM A276 super duplex S32750 round bars are manufactured according to strict industry standards set by the American Society for Testing and Materials (ASTM). These standards ensure that the bars meet specific requirements for composition, mechanical properties, and performance. This makes them a reliable and consistent choice for applications where quality and consistency are critical.
Stainless Steel Round Bar
Stainless steel round bars are another popular type of super duplex steel round bar. They are made from a combination of chromium, nickel, and molybdenum, which gives them excellent strength, durability, and resistance to corrosion. They are often used in applications such as aerospace engineering, medical equipment manufacturing, and food processing.
Forged Round Bars
Forged round bars are a type of super duplex steel round bar that is manufactured using a forging process. This process involves heating the metal to high temperatures and then shaping it using mechanical force. This results in a highly dense and uniform material with exceptional strength and durability. Forged round bars are often used in applications such as heavy machinery manufacturing, power generation, and construction.
UNS S32750 Round Bar
UNS S32750 is a specific grade of super duplex steel that contains high levels of both chromium and molybdenum. It is highly resistant to pitting and crevice corrosion, making it ideal for use in harsh environments where other materials may fail. UNS S32750 round bars are often used in applications such as chemical processing plants, oil refineries, and offshore drilling rigs.
Super Duplex Stainless Steel Round Bars and Rods
Specification
| Grade | Super Duplex 2507 – UNS S32760 |
| Specifications | ASTM A276, A479 / ASME SA276, SA479 |
| Round bar size | Diameter: 3–800mm |
| Flat bar size | Thickness: 2–100mm Width: 10 to 500mm |
| Hex Bar size | 2–100mm A/F |
| Square bar size | 4 to 100mm |
| Technique | Cold Drawn, Hot Rolled, Forged Round Bar, Rod, Cold Rolled |
| Tolerance | H8, H9, H10, H11, H12, H13K9, K10, K11, K12 or as per clients’ requirements |
| Standard | DIN, AISI, API, ASTM, EN, JIS, ASME, BS Round Bars |
| Finish | Cold (bright) drawn, centreless ground, hot rolled, smooth turned, peeled, slit rolled edge, hot rolled annealed, Rough Turned, Bright, Polish, Grinding, Centreless Ground & Black |
| Section | 3.0 to 12.0mm thickness |
| Form | Precision Ground Bar, Flat Bar, Square, Round, Half Round Bar, Rod, Rectangle, Hex (A/F), T-Bar, Channel Bar,Blocks, Round Rod, Threaded, Profiles, Billet, Ingot, I/H Bar, Forging, Rings, Hollow, Triangle etc. |
| Surface | Cold Drawn, Bright, Sand Blasting Finished, Hot Rolled Pickled, Hairline, Polished |
| Processing | Bar cutting to 650mm |
| Certificates | EN 10204 / 3.1 |
| Angle bar size | 3mm*20mm*20mm–12mm*100mm*100mm |
| Billet Size | 1/2″ to 495mm Diameter |
| Channel Bar | 80 X 40mm to 150 x 75mm section; 5.0 to 6.0mm thickness |
| Hollow Bar | 32mm OD x 16mm ID to 250mm OD x 200mm ID |
| Rectangles Size | 33 x 30mm to 295 x 1066mm |
| Condition | Hardened & tempered, annealed |
ASTM A276 S32760
Super Duplex Stainless Steel Round Bars and Rods Standards
| Grade | EN 10088-3 | EN 10272 | “AD2000- W2/W10” | ASTM A 479 | ASME SA 479 | NACE MR 0175 |
|---|---|---|---|---|---|---|
| ASTM A276 UNS S32760 Round Bar | 20-450 mm | 20-160 mm | – | 20-450 mm | 20-450 mm | Independent of size |
Super Duplex Stainless Steel Round Bars and Rods
Sizes
| Metric | US Bar | ASTM/ Canadian | Japanese | ||||
|---|---|---|---|---|---|---|---|
| Bar Size | Diam. (mm) | Bar Size | Diam. (Inch) | Bar Size | Diam. (mm2) | Bar Size | Diam. (mm) |
| 5 | 5 | #2 | 0.25 | 10M | 100 | 6 | 6 |
| 5.5 | 5.5 | #3 | 0.375 | 15M | 200 | 10 | 10 |
| 6 | 6 | #4 | 0.5 | 20M | 300 | 13 | 13 |
| 7 | 7 | #5 | 0.625 | 25M | 500 | 16 | 16 |
| 8 | 8 | #6 | 0.75 | 30M | 700 | 19 | 19 |
| 9 | 9 | #7 | 0.875 | 35M | 1000 | 22 | 22 |
| 10 | 10 | #8 | 1 | 45M | 1500 | 25 | 25 |
| 11 | 11 | #9 | 1.125 | 55M | 2500 | 29 | 29 |
| 12 | 12 | #10 | 1.25 | – | – | 32 | 32 |
| 14 | 14 | #11 | 1.375 | – | – | 35 | 35 |
| 16 | 16 | #12 | 1.5 | – | – | 38 | 38 |
| 18 | 18 | #13 | 1.625 | – | – | 41 | 41 |
| 20 | 20 | #14 | 1.75 | – | – | 44 | 44 |
| 22 | 22 | #15 | 1.875 | – | – | 48 | 48 |
| 25 | 25 | #16 | 2 | – | – | 51 | 51 |
| 28 | 28 | #18 | 2.25 | – | – | 57 | 57 |
| 32 | 32 | – | – | – | – | – | – |
| 36 | 36 | – | – | – | – | – | – |
| 40 | 40 | – | – | – | – | – | – |
| 44 | 44 | – | – | – | – | – | – |
| 50 | 50 | – | – | – | – | – | – |
Super Duplex Stainless Steel Round Bar
resistivity
| Temperature (°C) | μΩ·m | Temperature (°F) | μΩ·in. |
|---|---|---|---|
| 20 | 0.83 | 68 | 32.7 |
| 100 | 0.89 | 200 | 34.9 |
| 200 | 0.96 | 400 | 37.9 |
| 300 | 1.03 | 600 | 40.7 |
| 400 | 1.08 | 800 | 43.2 |
Super Duplex Stainless Steel Rod
elasticity
| Temperature (°C) | MPa | Temperature (°F) | ksi |
|---|---|---|---|
| 20 | 200 | 68 | 29 |
| 100 | 194 | 200 | 28.2 |
| 200 | 186 | 400 | 27 |
| 300 | 180 | 600 | 26.2 |
Super Duplex Stainless Steel Round Bars and Rods
Chemical Composition
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