Premium Duplex & Super Duplex Circles & Rings – Manufactured to ISO Standards with Finishes Including Shot Blasted, Polished, and Pickled. Available in Duplex Grades UNS S31803, S32205 and Super Duplex Grades UNS S32750, S32760.
Duplex and Super Duplex Circles & Rings for High-Performance Industrial Applications: Duplex and Super Duplex Circles & Rings are essential components in industries requiring exceptional strength, corrosion resistance, and durability. These products are widely used in sectors such as oil & gas, marine, petrochemical, desalination, and chemical processing. Engineered to withstand harsh, chloride-rich, and high-pressure environments, they provide long-term reliability and superior mechanical performance for critical applications.
Our Duplex and Super Duplex Circles & Rings are manufactured in compliance with ASTM A240 EN 1.4462, and EN 1.4410 standards, ensuring precision, mechanical strength, and excellent corrosion resistance. We offer a variety of grades including UNS S31803, S32205 (Duplex 2205), S32750 (Super Duplex 2507), and S32760. These rings and circles come with mill test certificates (MTC) and undergo strict quality checks to meet the stringent demands of global industries.
Available in diameters ranging from 10 mm to 250 mm and thicknesses from 5 mm to 80 mm, our Duplex and Super Duplex Circles & Rings are suitable for a wide range of applications. Common uses include flanges, valve bodies, pump parts, and structural components exposed to aggressive and corrosive environments. Their excellent resistance to pitting, crevice corrosion, and stress corrosion cracking makes them ideal for offshore, marine, and chemical processing equipment.
Focusing on key markets such as Europe, Russia, Saudi Arabia, Oman, Qatar, and the USA, we deliver tailored manufacturing solutions with competitive pricing and prompt delivery. Our dedication to quality and customer satisfaction guarantees dependable, high-performance Duplex and Super Duplex Circles & Rings customized to meet your project specifications and global standards.
ISO 9001:2015 Certified Manufacturer of Duplex & Super Duplex Circles & Rings – Including Forged, Rolled, Machined, and Flame-Cut Types for High-Performance Applications. Manufactured to ASTM A240 Standards with Full Dimensional Customization.
Duplex Steel Circles & Rings Specifications
| Product | Duplex & Super Duplex Circles & Rings |
| Grades | Duplex S31803, S32205, 2205, Super Duplex S32750, S32760, 2507 |
| Standards | ASTM A240 / ASME SA240 |
| Size Range | Diameter: 50mm to 1500mm (2″ to 60″) Thickness: 5mm to 100mm |
| Form | Forged Rings, Rolled Rings, Machined Circles |
| Types | Hot Rolled, Forged, Cold Rolled, Precision Machined |
| Surface Finish | Polished, Shot Blasted, Pickled, Passivated |
| Manufacturing Methods | Forging, Rolling, CNC Machining, Heat Treatment |
| Applications | Oil & Gas, Chemical Processing, Marine, Pulp & Paper Industry, Desalination Plants |
| Properties | High Corrosion Resistance, Excellent Strength, Good Weldability, Superior Stress Corrosion Cracking Resistance |
| Certifications | ISO 9001:2015, EN 10204 3.1, NACE MR0175, PED 2014/68/EU |
Types of Duplex Steel Circles & Rings
Blank Circles / Discs
Supplied in custom diameters and thicknesses as per client specifications.
Flange Rings
Rings used as components for flanges in piping systems, pressure vessels, etc.
Gasket Rings
Gasket Rings are Available in standard and custom sizes as per ASME or DIN specifications.
Spacer Rings
Rings used to maintain space between mechanical parts commonly used in equipment.
Washer Rings
Smaller rings used as washers for load distribution under bolts and nuts.
Split Rings
C-shaped or snap-fit rings used to hold assemblies in grooves or shafts.
Profile Cut Rings
Custom-shaped rings cut from plates using CNC, laser, or waterjet, for specific machinery.
Forged Rings
Heavy-duty rings forged for strength, used in aerospace, marine industry or heavy machinery.
Equivalent of Super Duplex Steel Circles
| Grade | UNS | WNR |
|---|---|---|
| S31803 | S31803 | 1.4462 |
| 2205 | S32205 | 1.4462 |
| 2507 | S32750/S32760 | 1.4410 |
Chemical Composition of Duplex Steel Rings
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
| S31803 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 22.0 – 23.0 | 3.0 – 3.5 | 4.50 – 6.50 | 0.14 – 0.20 | 63.72 min |
| S32205 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 21.0 – 23.0 | 2.50 – 3.50 | 4.50 – 6.50 | 0.8 – 0.20 | 63.54 min |
| S32750 | 0.030 max | 1.20 max | 0.80 max | 0.035 max | 0.020 max | 24.00 – 26.00 | 3.00 – 5.00 | 6.00 – 8.00 | 0.24 – 0.32 | 58.095 min |
| S32760 | 0.05 max | 1.00 max | 1.00 max | 0.030 max | 0.010 max | 24.00 – 26.00 | 3.00 – 4.00 | 6.00 – 8.00 | 0.20 – 0.30 | 57.61 min |
Mechanical Properties of Super Duplex Circles & Rings
| Grades | Density (g/cm 3) | Density (lb/in 3) | Melting Point (°C) | Melting Point (°F) |
| S31803 / S32205 | 7.805 | 0.285 | 1420 – 1465 | 2588 – 2669 |
| S32750 / S32760 | 7.8 | 0.281 | 1350 | 2460 |
Dimension Chart of Duplex Steel Circles
| Size | 26 G. | 24 G. | 22 G. | 20 G. | 19 G. | 18 G. |
|---|---|---|---|---|---|---|
| 20 | 0 – 785 | 0 – 880 | 1 – 120 | 1 – 340 | 1 – 400 | 1 – 920 |
| 19 | 0 – 750 | 0 – 794 | 1 – 010 | 1 – 300 | 1 – 350 | 1 – 732 |
| 18 | 0 – 683 | 0 – 712 | 0 – 907 | 1 – 116 | 1 – 200 | 1 – 595 |
| 17 | 0 – 560 | 0 – 635 | 0 – 809 | 0 – 940 | 1 – 080 | 1 – 382 |
| 16 | 0 – 460 | 0 – 563 | 0 – 736 | 0 – 921 | 0 – 960 | 1 – 228 |
| 15 | 0 – 405 | 0 – 495 | 0 – 650 | 0 – 808 | 0 – 860 | 1 – 080 |
| 14 | 0 – 352 | 0 – 430 | 0 – 558 | 0 – 708 | 0 – 750 | 0 – 940 |
| 13 | 0 – 304 | 0 – 371 | 0 – 608 | 0 – 508 | 0 – 640 | 0 – 811 |
| 12 | 0 – 253 | 0 – 318 | 0 – 403 | 0 – 518 | 0 – 540 | 0 – 690 |
| 11 | 0 – 218 | 0 – 266 | 0 – 338 | 0 – 435 | 0 – 450 | 0 – 580 |
| 10 | 0 – 180 | 0 – 220 | 0 – 280 | 0 – 360 | 0 – 380 | 0 – 480 |
| 9.5 | 0 – 162 | 0 – 198 | 0 – 252 | 0 – 324 | 0 – 342 | 0 – 472 |
| 9 | 0 – 145 | 0 – 178 | 0 – 230 | 0 – 301 | 0 – 330 | 0 – 388 |
| 8.5 | 0 – 130 | 0 – 156 | 0 – 202 | 0 – 262 | 0 – 270 | 0 – 347 |
| 8 | 0 – 115 | 0 – 140 | 0 – 180 | 0 – 230 | 0 – 240 | 0 – 307 |
| 7.5 | 0 – 100 | 0 – 123 | 0 – 157 | 0.201 | 0.212 | 0.270 |
| 7 | 0 – 088 | 0 – 107 | 0 – 136 | 0 – 176 | 0 – 190 | 0 – 235 |
| 6.5 | 0 – 074 | 0 – 093 | 0 – 128 | 0 – 150 | 0 – 153 | 0 – 200 |
| 6 | 0 – 064 | 0 – 079 | 0 – 100 | 0 – 130 | 0 – 136 | 0 – 172 |
| 5.5 | 0 – 054 | 0 – 066 | 0 – 085 | 0 – 109 | 0 – 119 | 0 – 146 |
| 5 | 0 – 045 | 0 – 055 | 0 – 070 | 0 – 090 | 0 – 095 | 0 – 120 |
| 4.5 | 0 – 040 | 0.049 | 0 – 062 | 0 – 080 | 0 – 085 | .0 – 107 |
Super Duplex Steel Rings Weight Chart
| Diameter (mm) | Thickness (mm) | Approx. Weight (kg) |
|---|---|---|
| 50 | 5 | 0.98 |
| 100 | 10 | 7.85 |
| 200 | 15 | 35.34 |
| 300 | 20 | 88.39 |
| 400 | 30 | 176.71 |
| 600 | 40 | 441.79 |
| 800 | 50 | 785.40 |
| 1000 | 60 | 1178.10 |
| 1200 | 80 | 1884.96 |
| 1500 | 100 | 2945.24 |
Worldwide Supply of Duplex Steel Circles & Rings
Russia, Bahrain, Cyprus, Egypt, Iran, Iraq, Israel, Jordan, Kuwait, Lebanon, Oman, Palestine, Qatar, Saudi Arabia, Syria, Turkey, United Arab Emirates (UAE), Yemen, United States of America (USA), Albania, Andorra, Austria, Belarus, Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Moldova, Monaco, Montenegro, Netherlands, North Macedonia, Norway, Poland, Portugal, Romania, San Marino, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Ukraine, United Kingdom, Vatican City.
