Home > Duplex Steel > Duplex Steel Coils
Duplex Steel Coilsare alloys made from an even mix of austenitic and ferritic stainless steels, celebrated for their exceptional strength and resistance to corrosion. They are extensively utilized across numerous industries, such as oil and gas, chemical processing, marine, and construction. These coils serve in producing pipelines, pressure vessels, heat exchangers, and structural parts, where longevity and reliable performance in severe conditions are essential. Providing an affordable option for challenging applications, duplex steel coils act as dependable materials valued for their durability and toughness.
| Grades | Density (g/cm 3) | Density (lb/in 3) | Melting Point (°C) | Melting Point (°F) |
| Duplex Steel Coils | 7.805 | 0.285 | 1420 – 1465 | 2588 – 2669 |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
| Duplex Steel Coils | 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 |
At Koasteel, we take pride in being the largest supplier and manufacturer in the New Zealand, delivering advanced solutions for every one of your piping requirements. With cutting-edge manufacturing facilities strategically situated in the New Zealand, we maintain an extensive stock of more than 25,000 tons of top-quality materials kept readily on hand.
Reach out to us for a fast quote tailored to your requirement.
We supply these Duplex Steel Coils in accordance with DIN, ISO, JIS or ANSI Standard.
Duplex Steel Coils have applications as varied as the industries they cater to, driven mainly by the aerospace, railway, construction and automotive industries along with petrochemical, nuclear, medical, Oil & Gas, Chemical, Pharmaceutical, Food & Beverage, Nuclear, Thermal Power plants, Paper and Pulp, marine and mining, etc.
YesDuplex Steel Coils are compatible with standard welding methods including TIG (tungsten inert gas), MIG (metal inert gas), and SMAW (shielded metal arc welding). That said, appropriate care is required because of their two-phase microstructure. Preparatory steps before welding, such as pre-heating, along with post-weld heat treatment, may be required to avoid problems like sensitization and embrittlement. Using the right filler metals and shielding gases is vital to preserve the soundness and corrosion resistance of the welded joints. Adhering to manufacturer guidance and industry best practices is key to reducing the likelihood of weld-related flaws and sustaining the performance of duplex steel coil welds.
Duplex steel coils work well for a broad spectrum of uses spanning industries like oil and gas, chemical processing, marine, aerospace, construction, and beyond. They are frequently employed to manufacture pipelines, pressure vessels, heat exchangers, structural components, and offshore platforms in situations where corrosion resistance, high strength, and durability are critical. Thanks to their adaptable characteristics, duplex steel coils perform exceptionally in demanding conditions involving corrosive chemicals, seawater, and elevated temperatures, which makes them well suited for vital applications that demand reliability and performance.
Recommended welding methods for joining duplex steel coils include TIG (tungsten inert gas), MIG (metal inert gas), SMAW (shielded metal arc welding), SAW (submerged arc welding), laser welding, and electron beam welding. Each method provides particular benefits based on the material’s thickness, accessibility, and required weld quality. Heat treatments before and after welding may be needed to avoid sensitization and preserve corrosion resistance. Choosing the right filler metals and shielding gases is essential to guarantee weld integrity and mechanical properties.
YesAdditionally, machining or fabricating duplex steel coils calls for special attention. Owing to their dual-phase microstructure, duplex steels offer greater toughness and strength compared to standard stainless steels. Machining should be carried out at reduced speeds, using heavier cuts and ample coolant to limit work hardening and wear on tooling. Carbide tools are advised. Moreover, treatments after machining, like stress relieving, may be required to bring back material properties. Careful cleaning prior to fabrication is critical for removing contaminants that might compromise weld quality or corrosion resistance.
Email: sales@koasteel.nz
