Super Duplex Round Bars
A Super Duplex Bar is a high-performance stainless steel product designed for critical applications that require exceptional strength & corrosion resistance. Consists of an equal balance of austenite & ferrite microstructures, they offer superior mechanical properties & resistance to stress corrosion cracking, pitting & crevice corrosion especially in chloride-rich environments. Super duplex round bars are alloyed with higher levels of chromium & molybdenum compared to standard duplex grades to make it highly resistant to uniform corrosion caused by aggressive chemicals such as acetic, formic acid etc. Additionally, super duplex bars perform well in both high & low temperatures, offering excellent toughness & durability. These super duplex round bars are supplied in secure wooden packaging to prevent rust & damage during transit. With lower nickel & higher chromium content, they offer a cost-effective yet reliable solution for demanding environments.
Super Duplex Round Bar Manufacturer & Supplier
Kalpataru Piping Solutions is a leading manufacturer, supplier & exporter of super duplex steel products including round bars offering high quality products in grades UNS S32750 & UNS S32760. These bars are used in challenging environments due to their exceptional strength, corrosion resistance & long service life.
Our super duplex bars are manufactured in strict compliance with international quality standards to ensure reliability & performance. They offer superior resistance to pitting, crevice corrosion & chloride to induce stress corrosion cracking. Our super duplex round bars undergo rigorous quality checks to meet dimensional accuracy, mechanical strength & corrosion resistance standards. Our modern manufacturing setup & skilled professionals allow us to fulfill both bulk & custom orders with fast delivery timelines. We mainly focus on customer satisfaction to offer quality assurance & competitive pricing.
Grades of Super Duplex Round Bars
At Kalpataru Piping Solutions, we offer a premium range of Super Duplex Round Bars in various grades to meet the demanding requirements of industries operating in harsh environments. Our bars are manufactured using high-grade raw materials and adhere to international standards for quality and performance.
Super Duplex UNS S32750 Round Bar
Also known as Super Duplex 2507, this grade offers excellent resistance to pitting, crevice corrosion, and chloride induced stress corrosion cracking. Used in offshore platforms, marine applications, desalination plants & chemical processing. High strength, excellent weldability & outstanding corrosion resistance in aggressive environments.
Super Duplex UNS S32760 Round Bar
Known for its higher impact strength and resistance to sulfide stress corrosion, this grade is ideal for sour service applications. Oil & gas refineries, pressure vessels & heat exchangers. Enhanced mechanical properties, strong resistance to cracking & superior durability in both acidic and saline conditions.
Super Duplex Round Bars Specification
Discover the detailed specifications of Super Duplex Round Bars including grades S32750/S32760, available sizes, lengths, finishes, standards, and mechanical properties for high-performance industrial applications.
| Parameter | Details |
| Standard | ASTM A276, AMS 5513, AMS 5511, AMS 5647 |
| Dimensions | EN, DIN, JIS, ASTM, BS, ASME, AISI |
| Size | 10 mm to 100 mm Dia in 100 mm to 6000 mm Length |
| Length | 3 to 6 meters, Custom Cut Lengths |
| Condition | Cold Drawn & Polished, Cold Drawn, Centreless Ground & Polished |
| Finish | Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish |
Super Duplex Round Bars Mechanical Properties
Super Duplex Round Bars offer high tensile strength, excellent yield strength, superior toughness, and exceptional resistance to stress corrosion.
| Mechanical properties | Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) | Hardness, HB（max） |
| S32750 | 116 [800] | 80 [550] | 15 | 300 |
| S32760 | 109 [750] | 80 [550] | 25 | 300 |
Equivalent Grades of Super Duplex Bars
Super Duplex Bars are available in equivalent grades like UNS S32750 (Werkstoff Nr. 1.4410) and UNS S32760 (Werkstoff Nr. 1.4501), offering excellent strength and corrosion resistance.
| STANDARD | WERKSTOFF NR. | UNS |
| Super Duplex S32750 | 1.4410 | S32750 |
| Super Duplex S32760 | 1.4501 | S32760 |
Weight Chart of Super Duplex Bar
Find accurate weight details for Super Duplex Bars across various diameters and lengths. Our weight chart simplifies planning, shipping, and installation needs.
| Size in mm | Average Weight | |
| KG/MTR | KG/FT | |
| 10 | 0.62 | 0.18 |
| 12 | 0.90 | 0.30 |
| 14 | 1.20 | 0.40 |
| 16 | 1.60 | 0.50 |
| 18 | 2.00 | 0.60 |
| 20 | 2.50 | 0.80 |
| 22 | 3.00 | 0.90 |
| 24 | 3.56 | 1.08 |
| 25 | 3.90 | 1.20 |
| 28 | 4.80 | 1.50 |
| 30 | 5.55 | 1.69 |
| 32 | 6.30 | 1.90 |
| 34 | 7.14 | 2.18 |
| 36 | 8.00 | 2.44 |
| 40 | 9.90 | 3.00 |
| 45 | 12.49 | 3.81 |
| 50 | 15.40 | 4.70 |
| 56 | 19.34 | 5.89 |
| 60 | 22.20 | 6.80 |
| 63 | 24.47 | 7.46 |
| 63.5 | 24.86 | 7.58 |
| 65 | 26.05 | 7.94 |
| 70 | 30.20 | 9.20 |
| 73 | 32.86 | 10.00 |
| 75 | 34.72 | 10.58 |
| 78 | 37.51 | 11.43 |
| 80 | 39.50 | 12.00 |
| 83 | 42.47 | 12.95 |
| 85 | 44.55 | 13.58 |
| 90 | 50.00 | 15.20 |
| 92 | 52.19 | 15.91 |
| 93 | 53.39 | 16.27 |
| 95 | 55.65 | 16.95 |
| 100 | 61.66 | 18.79 |
| 105 | 67.98 | 20.72 |
| 110 | 74.60 | 22.74 |
| 115 | 81.64 | 24.88 |
| 125 | 96.34 | 29.36 |
Super Duplex Round Bar Sizes
Available in a wide range of diameters from 10 mm to 100 mm and lengths up to 6000 mm, Super Duplex Round Bars can be customized to meet your specific project requirements.
| 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 Bar Resistivity
Super Duplex Bars offer low electrical resistivity, making them suitable for applications requiring both mechanical strength and limited conductivity in harsh environments.
| Temperature, °C | μΩm | Temperature, °F | μΩin. |
| 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 |
Elasticity of Super Duplex Steel Bar
Super Duplex Steel Bars exhibit high elasticity with a typical modulus of elasticity around 200 GPa ensuring flexibility under stress and stability in dynamic systems.
| 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 Steel Round Bar Temperature
These bars perform reliably across a broad temperature range, maintaining strength and corrosion resistance up to 300°C and down to sub-zero conditions.
| Grade | Temperature |
| Duplex 2707 HD | 1080-1120°C/ 1976-2048°F |
| Duplex 2507 | 1050-1125°C/ 1922-2057°F |
Tolerance of Super Duplex Round Bar
Super Duplex Round Bars are manufactured with tight dimensional tolerances as per ASTM/ASME standards, ensuring precise fit, consistent diameter, and smooth surface finish for critical engineering applications.
| Diameter in Imperial | Diameter in Metric | Tolerance |
| .500 | 12.70 | .18 |
| .625 | 15.88 | .18 |
| .875 | 22.23 | .21 |
| 1.181 | 30 | .21 |
| 1.575 | 40 | .25 |
| 1.969 | 50 | .25 |
| 2.362 | 60 | .30 |
| 2.559 | 65 | .30 |
| 331 | 77 | +1 mm |
| 3.346 | 85 | +1 mm |
| 3.740 | 95 | +1 mm |
| 4.331 | 110 | +1.5 mm |
| 5.118 | 130 | +1.5 mm |
| 624 | 153 | +1.5 mm |
| 6.693 | 170 | +1.5 mm |
| 787 | 180 | +1.5 mm |
| 7.874 | 200 | +1.5 mm |
| 8.661 | 220 | +1.5 mm |
| 10 | 254 | -0 / +3 mm |
| 1247 | 306 | -0 / +3 mm |
| 1370 | 332 | -0 / +3 mm |
| 15 | 381 | -0 / +3 mm |
| 16.535 | 420 | -0 / +3 mm |
Super Duplex Bar Physical Properties
Super Duplex Bars combine high tensile strength, low thermal expansion, good thermal conductivity, and superior corrosion resistance, ideal for critical industrial applications.
| Density | Modulus of Elasticity | Thermal Expansion | Thermal Conductivity |
| 7.8 g/cm3 | 200 GPa | 30–100°C (86–212°F) | 31.5/μΩ. in, 80/μΩ cm |
Frequently Asked Questions About Super Duplex Round Bars
What Welding Methods Are Best Suited for Super Duplex Stainless Steel Round Bars?
Super Duplex Stainless Steel Round Bars require precise welding techniques to preserve their dual-phase microstructure & mechanical properties. Including TIG (GTAW), MIG (GMAW) & SAW (Submerged Arc Welding). These methods provide controlled heat input essential to avoid phase imbalance or intermetallic phase formation. Using matching filler metals & post weld heat treatment helps to maintain corrosion resistance & toughness.
How Are Super Duplex Round Bars Tested for Quality?
To ensure quality & compliance they undergo rigorous testing procedures. In addition, intergranular corrosion tests & pitting resistance equivalent number (PREN) checks are conducted to assess corrosion behavior.
What Are the Most Common Grades of Super Duplex Stainless Steel Used for Round Bars?
Popular grades are available like UNS S32750 & UNS S32760 known for their exceptional strength, corrosion resistance, & performance in harsh environments. These grades meet ASTM A276 & A479 standards.
What Are the Key Advantages of Using Super Duplex Stainless Steel Round Bars?
They offer benefits like high tensile & yield strength, chloride stress corrosion cracking resistance & longer service life. Their dual-phase structure ensures better toughness & their low nickel content delivers top-tier performance in aggressive environments.
What Should Be Considered When Choosing Super Duplex Stainless Steel Round Bars?
Consider factors such as material grade, corrosion environment, required mechanical properties, bar size and tolerance & compliance with international standards. Application-specific factors like temperature range, exposure to chlorides & welding requirements also play a critical role in choosing the right product.
