Duplex stainless steel fasteners, with their mostly ferritic, austenitic microstructure, are responsible for many offshore oil platforms providing them strength and resistance to chloride corrosion. Platforms, desalination plants, and petrochemical piping are typical application areas. Where mechanical strength and corrosion resistance need to be present at the same time,
ASTM A182 F51 Bolts are the type that is most often indicated for flanges that are among the most exposed to the environment and pressure, primarily made of duplex material.
Bolts made according to the forging standard ASTM A182 and from duplex grades such as UNS S31803 or S32205, are mainly made of stud bolts, heavy hex bolts, and threaded rods. Sizes range from M10 up to M64. UN and metric thread forms consistent with the flange systems ASME B16.5 and B16.47 are the most used ones. In large piping projects, parts like seawater pumps, heat exchangers, pressure vessels, and valve bodies that need duplex bolts and are usually found in aggressive environments with temperatures between -50°C and 300°C. In Riyadh and Dammam procurement people ask for complete traceability, EN 10204 3.1 certificate, PMI, testing, and a maximum hardness of 28 HRC to keep corrosion resistance at the same level.
Online Digital B2B market places like pipingmaterial.sa serve as an intermediate to engineering contractors looking for vendors and stockists with ASTM A182 F51 fasteners in different thread forms, lengths, and coating conditions suitable for energy and water infrastructure projects. In cases when the fastener heads must be very low-profile or hex internal drives/nuts are used, the
Duplex Steel Socket Head Cap Screws are very popular. Sizes range from M6 to M36. The mechanical properties of these screws are high tensile strength, fatigue resistance, and excellent performance in chlorides. If you want to know where authentic suppliers for duplex socket head cap screws for valve actuators instruments, brackets, and compact mechanical assemblies are you can use pipingmaterial.sa. People in cities like Jeddah are very much using it nowadays.
Locked
