Home > Duplex Steel > Duplex Steel Stud Bolts
Duplex Steel Stud Boltsare heavy-duty fasteners crafted from a variety of stainless steel called duplex steel. This steel mixture merges the finest qualities of both austenitic and ferritic stainless steels, delivering remarkable strength and resistance to corrosion. These stud bolts see frequent use across industries such as oil and gas, chemical processing, and marine applications, where demanding conditions call for dependable and long-lasting fastening solutions. They deliver outstanding results in environments where conventional steel fasteners could corrode or fail too soon, granting superior protection against corrosion, stress corrosion cracking, and elevated temperatures.
| Grade | Duplex Steel UNS S31803 / S32205 |
| Specifications | ASTM A 479 ASME SA 479 |
| Dimension | DIN, ASTM, BS and all International Standards |
| Length | 3mm to 200mm |
| Size | M3 – M56 | 3/6″ to 2″ | Custom Sizes |
| Types | Threaded Rod, Class A double ended stud, Tie Rod, Double Ended Stud, Stud Bolts, Bronze Hex Studs, Threaded Studs etc |
Duplex Steel Stud Bolts | 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 % |
Duplex Steel Stud Bolts |
C | N | P | Si | Mn | Mo | Fe | Cr | S | Ni |
| 1.0 | 0.03 | 0.02 | 2.0 | 3.0 – 3.5 | 22.0 – 23.0 | 0.03 | 4.5 – 6.5 | 0.14 – 0.2 | Bal |
At Koasteel, we take great 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 ready and available in inventory.
Reach out to us for a fast quote tailored to your requirement.
These Duplex Steel Stud Bolts are supplied by us in accordance with DIN, ISO, JIS or ANSI Standard.
Duplex Steel Stud Bolts serve applications as varied as the industries that rely on them, led 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.
Yes, duplex steel stud bolts can be recycled. Duplex steel, much like other stainless steels, is highly recyclable and can be melted and reprocessed into new products without sacrificing its valuable properties. Recycling duplex steel stud bolts and other stainless steel parts helps preserve natural resources, cut energy usage, and reduce waste. On top of that, stainless steel recycling makes economic sense and supports sustainability efforts by advancing a circular economy in which materials are reused and repurposed.
YesAdditionally, duplex steel stud bolts are suitable for underground applications thanks to their corrosion-resistant qualities. Underground settings present difficulties like moisture, soil acidity, and chemical exposure, all of which can cause corrosion in conventional fasteners. The outstanding corrosion resistance of duplex steel makes it well-suited to endure these conditions, safeguarding the strength and durability of underground structures and equipment. Whether used in underground pipelines, utility setups, or mining operations, duplex steel stud bolts deliver dependable fastening solutions that hold up in demanding underground environments.
When installing duplex steel stud bolts, a number of factors are critical to guaranteeing correct performance and long service life. To begin with, it is vital to confirm that the stud bolts are compatible with their surrounding environment, taking into consideration elements like corrosion, temperature, and stress levels. Adequate surface preparation and cleaning must be done to eliminate contaminants that might undermine the soundness of the fasteners. On top of that, care should be given to the torque specifications and tightening methods to avoid overloading or underloading, both of which can influence the bolt’s performance. Lastly, routine inspection and maintenance are advised to spot any indications of corrosion, wear, or loosening, thereby securing the ongoing dependability of the duplex steel stud bolts as time goes on.
Mail: sales@koasteel.nz
