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Unimix Metal Cooperation manufactures, exports, and supplies Super Duplex S32750 and S32760 Welded Pipes. These pipes are available in various types, including Welded, ERW, EFW, and Fabricated, and come in square, rectangular, coiled, U-shape, and hydraulic forms. Super Duplex UNS S32750 is an austenitic-ferritic duplex steel offering excellent resistance to pitting and crevice corrosion.
Our ASTM 790 Super Duplex Steel UNS S32760 Welded Pipes are versatile with good weldability, widely used in offshore and marine industries due to their resistance to acid corrosion. ASTM A789 Super Duplex Steel UNS S32750 Pipes are highly alloyed, providing superior mechanical strength and high chloride corrosion resistance, making them ideal for aggressive chloride environments.
We cater to various industries, from basic sectors like Sugar, Paper, Textile, and Engineering to complex ones like Oil & Gas, Petrochemical, Chemical & Fertilizers, Power Generation, and Nuclear Industries.
Super Duplex Stainless Steel, known for its high strength and exceptional corrosion resistance, is widely used in chemical and process industries, pulp mills, offshore systems, and flue gas desulfurization units. Its localized corrosion resistance rivals that of 6% Mo Super-Austenitic grades.
SUPER DUPLEX STEEL PIPE SPECIFICATIONS
Grade | Super Duplex Steel UNS S32750 / UNS S32760 |
Size | 1/2″NB TO 12 “NB IN |
Standard | ASTM A789 / A790 |
Seamless Pipes Sizes | 1 / 2″ NB – 8″ NB |
Welded Pipes Sizes | 6″ NB – 24″ NB |
Form | Round, Square, Rectangular, Hydraulic Etc |
Schedule | SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS |
Length | Single Random, Double Random & Cut Length. |
Type | Seamless / ERW / Welded / Fabricated / EFW |
End | Plain End, Beveled End, Treaded |
UNS | C % | Cr % | Ni % | Mo % | N % | Mn % | Cu % | W | S | Si |
S32750 | < 0.03 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.24-0.32 | < 1.20 | < 0.5 | – | – | – |
S32760 | < 0.03 | 24.0-26.0 | 6.0-8.0 | 3.0-4.0 | 0.20-0.30 | < 1.00 | 0.5-1.0 | 0.5-1.0 | – | – |
S32550 | < 0.04 | 24-27 | 4.5-6.5 | 2.9-3.9 | 0.10-0.25 | < 1.5 | 1.5-2.5 | – | 0.03 | 1.60 |
Grade | YS (MPa) | UTS (MPa) | % Elongation | Hardness(BHN) |
UNS S32750 | 550 min. | 795 min. | 15 min. | 310 max. |
UNS S32760 | 550 min. | 750 min. | 25 min. | 270 max. |
Fabricability: These pipes should be hot worked within 1250-1000°C, followed by solution annealing at 1100°C and rapid quenching. Cold forming is possible using standard stainless steel methods, though higher yield strength demands greater forming forces, larger bending radii, and more allowance for spring back. Processes like deep drawing and stretch forming are challenging.
Weldability: Super Duplex Steel offers good weldability, compatible with Shielded Metal Arc Welding (SMAW), Gas Tungsten Arc Welding (GTAW), Plasma Arc Welding (PAW), and Submerged Arc Welding (SAW). Surfaces should be clean before welding, and preheating is unnecessary except to avoid condensation. Heat input should range between 0.3-1.5KJ/mm, with the interpass temperature kept below 150°C. The root must be shielded with commercial argon or 90% nitrogen/10% hydrogen purging gas for optimal corrosion resistance.
Corrosion Resistance: With low carbon content, these pipes resist carbide-related intergranular corrosion, reducing carbide precipitation risks during heat treatment. Their critical pitting temperature (CPT) surpasses that of 904L. They excel in resisting crevice corrosion, SCC, and uniform corrosion by organic acids like formic and acetic acid.
Unimix Metal Corporate, under the leadership and mentoring of intellectual individuals, is currently one of the Manufacturer, Supplier, Stockiest, Importer and Exporter of Stainless Steel , Carbon Steel , Alloy Steel , High Nickel Alloys , Special Alloys , Aluminium Alloys , Copper Nickel , Titanium Alloys , Duplex & Super Duplex , Tantalum , Abrasion Resistant Steel, Hadfield Manganese Steel , Corten Steel , High Tensile , Quenched & Tempered Steel , Armour Steel , etc in Forms of Pipes , Tubes , Plates , Round Bars and Fittings.
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