Ronwen Flanges, a well-respected manufacturer and supplier located in Cape Town, South Africa, specializes in high-performance Super Duplex Steel Flanges. These flanges are crafted for exceptional strength, durability, and corrosion resistance, making them perfect for tough industrial settings. They’re particularly suited for the oil and gas, petrochemical, marine, and desalination sectors, where exposure to harsh, chloride-rich environments is a regular challenge. Built to meet international standards, Ronwen Flanges’ Super Duplex Steel Flanges guarantee outstanding mechanical strength, leak-proof operation, and a long lifespan in high-pressure and high-temperature applications.
These flanges are made up of about 25–28% chromium, 6–7% nickel, 3–5% molybdenum, along with trace amounts of nitrogen. This unique blend offers remarkable resistance to pitting, crevice corrosion, and chloride stress corrosion cracking. The dual-phase microstructure, which includes both austenite and ferrite, boosts tensile and yield strength, fatigue resistance, and toughness, ensuring reliable performance even in aggressive conditions and varying temperatures.
| Specifications | : | ASTM A182 / ASME SA182 |
| Size | : | 1/8″ NB TO 24″ NB |
| Standards | : | ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc. |
| Class / Pressure | : | 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc. |
| Standard | : | ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc. |
| Grades | : | S32750 / S32760 / S32950 |
Ronwen Flanges, a leading supplier in Cape Town, South Africa, offers an extensive selection of Super Duplex Steel Flanges, including weld neck flanges, slip-on flanges, blind flanges, threaded flanges, and lap joint flanges. Designed for diverse industrial applications, our high-quality inventory and commitment to exceptional service make us a trusted choice for flange products in the region.
| % | ASTM A182 Super Duplex UNS S32750 And UNS 32760 Flanges |
| C | 0.03 maximum |
| Mn | 1.5 |
| Mo | 3.0-5.0 |
| Ni | 5.5-8.0 |
| N | 0.2-0.35 |
| Si | 0.8 |
| P | 0.035 |
| S | 0.02 |
| Cr | 24-26 |
| Cu | 0.5-3.0 |
| Tensile Strength (in MPa) | 770 |
| A5 Elongation (in %) | 25 |
| Proof Stress 0.2% (in MPa) | 550 |
Super Duplex Steel flanges have widespread use in industries requiring high strength corrosion resistance and durability in aggressive environments. They are ideal for offshore oil and gas platforms subsea pipelines and desalination plants due to their resistance to seawater and chloride-induced corrosion. Super Duplex Steel flanges also have extensive application in chemical processing, heat exchangers, pressure vessels, and power generation systems. In marine, pulp and paper, and environmental engineering applications, Super Duplex flanges ensure long-term performance under high pressure and temperature. Their higher mechanical properties guarantee that they will be a reliable choice for demanding applications involving safety and structural integrity.
| Normal Pipe Size | Flanges Diameter (‘O’) | Diameter of (B.C.) ‘A’ | Diameter of (B.H.) ‘D’ | Holes Number | Flanges Wall Thickness ‘C’ | Diameter (Flanges) at Weld Bevel | (Flanges) Diameter of Hub ‘E’ | Length Of Through Hub | Bore (‘B’) | Diameter of (RF) R | Depth of Socket Weld F | Threading Length | ||||
| SORF/ SWRF (Y) | WNRF (Y) | Lap Joit (Y) | SORF/ SWRF (B) | Lap Joit (B) | ||||||||||||
| 1/2” | 15 | 95.2 | 66.7 | 15.9 | 4 | 14.3 | 21.3 | 38.1 | 22.2 | 52.4 | 22.2 | 22.3 | 22.9 | 34.9 | 9.5 | 15.9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3/4” | 20 | 117.5 | 82.5 | 19.0 | 4 | 15.9 | 26.7 | 47.6 | 25.4 | 57.1 | 25.4 | 27.7 | 28.2 | 42.9 | 11.1 | 15.9 |
| 1” | 25 | 123.8 | 88.9 | 19.0 | 4 | 17.5 | 33.5 | 54.0 | 27.0 | 61.9 | 27.0 | 34.5 | 35.0 | 50.8 | 12.7 | 17.5 |
| 1 | 32 | 133.3 | 98.4 | 19.0 | 4 | 20.6 | 42.2 | 63.5 | 28.6 | 66.7 | 28.6 | 43.2 | 43.7 | 63.5 | 14.3 | 20.6 |
| 1 | 40 | 155.6 | 114.3 | 22.2 | 4 | 22.2 | 48.3 | 69.8 | 31.7 | 69.8 | 31.7 | 49.5 | 50.0 | 73.0 | 15.9 | 22.2 |
| 2” | 50 | 165.1 | 127.0 | 19.0 | 8 | 25.4 | 60.4 | 84.1 | 36.5 | 73.0 | 36.5 | 62.0 | 62.5 | 92.1 | 17.5 | 25.4 |
| 2 | 65 | 190.5 | 149.2 | 22.2 | 8 | 28.6 | 73.1 | 100.0 | 41.3 | 79.4 | 41.3 | 74.7 | 75.4 | 104.8 | 19.0 | 28.6 |
| 3” | 80 | 209.5 | 168.3 | 22.2 | 8 | 31.8 | 88.9 | 117.5 | 46.0 | 82.5 | 46.0 | 90.7 | 91.4 | 127.0 | – | 30.2 |
| 3 | 90 | 228.5 | 184.2 | 22.2 | 8 | 34.9 | 101.6 | 133.4 | 49.3 | 85.7 | 49.3 | 103.4 | 104.1 | 140.0 | – | 31.7 |
| 4” | 100 | 273.0 | 215.9 | 25.4 | 8 | 38.1 | 114.3 | 152.4 | 54.0 | 101.6 | 54.0 | 116.1 | 116.8 | 157.2 | – | 33.3 |
| 5” | 125 | 330.2 | 266.7 | 28.6 | 8 | 44.4 | 141.2 | 188.9 | 60.3 | 114.3 | 60.3 | 143.8 | 144.5 | 185.7 | – | 36.5 |
| 6” | 150 | 355.6 | 292.1 | 28.6 | 12 | 47.6 | 168.4 | 222.2 | 66.7 | 117.5 | 66.7 | 170.7 | 171.4 | 215.9 | – | 39.7 |
| 8” | 200 | 419.1 | 349.2 | 31.7 | 12 | 55.6 | 219.2 | 273.0 | 76.2 | 133.3 | 76.2 | 221.5 | 222.2 | 269.9 | – | 44.4 |
| 10” | 250 | 508.0 | 431.8 | 34.9 | 16 | 63.5 | 273.0 | 342.9 | 85.7 | 152.4 | 111.2 | 276.3 | 277.4 | 323.8 | – | 49.2 |
| 12” | 300 | 558.8 | 488.9 | 34.9 | 20 | 66.7 | 323.8 | 400.0 | 92.1 | 155.6 | 117.3 | 327.1 | 328.2 | 381.0 | – | 55.6 |
| 14” | 350 | 603.2 | 527.0 | 38.1 | 20 | 69.9 | 355.6 | 431.8 | 93.7 | 165.1 | 127.0 | 359.1 | 360.2 | 412.7 | – | 57.1 |
| 16” | 400 | 685.8 | 603.2 | 41.3 | 20 | 76.2 | 406.4 | 495.3 | 106.4 | 177.8 | 139.7 | 410.5 | 411.2 | 469.9 | – | 63.5 |
| 18” | 450 | 742.9 | 654.0 | 44.4 | 24 | 82.6 | 457.2 | 546.1 | 117.5 | 184.1 | 152.4 | 461.8 | 462.3 | 533.4 | – | 68.3 |
| 20” | 500 | 812.8 | 723.9 | 44.4 | 24 | 88.9 | 508.0 | 609.6 | 127.0 | 190.5 | 165.1 | 513.1 | 514.3 | 584.2 | – | 73.0 |
| 24” | 600 | 939.8 | 838.2 | 50.8 | 24 | 101.6 | 609.6 | 717.5 | 139.7 | 203.2 | 184.1 | 615.9 | 615.9 | 692.1 | – | 82.5 |
You’ll find these flanges commonly used in pipelines, offshore platforms, pressure vessels, heat exchangers, and seawater systems. They come in a variety of types, including weld neck, slip-on, blind, threaded, socket weld, and lap joint configurations. Ronwen Flanges’ Super Duplex Steel Flanges provide exceptional mechanical performance and corrosion resistance. Their blend of high strength, low maintenance needs, and long-lasting reliability makes them a top choice for critical and demanding industrial applications.
We are renowned for delivering products with precise, accurate dimensions. Each product undergoes thorough testing, both destructive and non-destructive, to ensure quality before being shipped to our customers.
Our team is ready to assist you. Contact us for any queries or personalized solutions.
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