Neil Metals, based in the bustling industrial heart of Kolkata, India, has carved a niche for itself as a reliable manufacturer and supplier of top-notch Duplex Steel Hollow Bars. With decades of metallurgical know-how paired with cutting-edge production technology, the company produces bars that adhere to strict international standards for strength, corrosion resistance, and dimensional precision. Their state-of-the-art facility, featuring advanced extrusion, heat treatment, and non-destructive testing lines, ensures consistent quality and the flexibility to handle everything from prototype runs to large bulk orders. With a strong focus on customer satisfaction, swift logistics both in India and internationally, and comprehensive technical support, Neil Metals has become a go-to partner for engineering projects across various industries worldwide.
Duplex Steel Hollow Bars typically consist of about 22–25% chromium, 4–6% nickel, 3–5% molybdenum, along with small amounts of nitrogen, manganese, and copper, all balanced with iron to create a dual-phase microstructure of ferrite and austenite. This unique composition provides a minimum yield strength of around 450 MPa and an ultimate tensile strength close to 620 MPa, with an elongation of 25% and a hardness rating below 290 HBW, ensuring exceptional toughness even at -50 °C. High PREN values (greater than 35) guarantee outstanding pitting resistance, while balanced thermal expansion and excellent weldability make these bars dependable under dynamic loads and fluctuating temperatures in corrosive offshore settings.
Standards : EN, DIN, JIS, ASTM, BS, ASME, AISI
Size : 10 mm To 100 mm Dia in
Length : 100 mm TO 6000 mm Length.
Specifications : ASTM A276, A479 / ASME SA276, SA479
Form : Hollow
Finish : Bright, Polish & Black
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 |
| S31803 / S32205 | Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 7.8 g/cm3 | 1350 °C (2460 °F) | Psi – 80000 , MPa – 550 | Psi – 116000 , MPa – 800 | 15 % |
Yes, Duplex Steel Hollow Bars can be recycled after use. Their high metal content makes them suitable for reuse in various industrial processes, promoting sustainability and resource efficiency.
Yes, Duplex Steel Hollow Bars are suitable for cryogenic applications due to their excellent toughness, strength, and resistance to brittle fracture at extremely low temperatures.
Yes, Duplex Steel Hollow Bars can be used for underground applications due to their high corrosion resistance, strength, and durability, even in harsh and moisture-prone environments.
Designers often opt for Duplex Steel Hollow Bars when they need lightweight yet incredibly strong tubular components that can withstand chloride stress corrosion cracking. Process engineers frequently specify them for heat exchanger shells, evaporator coils, and condenser tubes in desalination plants, refineries, and chemical processing facilities. Offshore platforms depend on these bars for riser spools, hydraulic manipulators, and fire-water systems, allowing for weight reduction without sacrificing fatigue life. In pulp-and-paper digesters, high-pressure scrubbers, and flue-gas desulfurization units, these bars excel at resisting acid attacks and abrasive slurry erosion.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Neil Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Kolkata, India
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