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Punit Fasteners is a reputable manufacturer and supplier of Duplex Steel S31803 Nuts, proudly based in Delhi, India. We specialize in providing top-notch fastening solutions tailored for critical industrial applications. Our Duplex S31803 nuts are celebrated for their outstanding mechanical strength, impressive corrosion resistance, and remarkable durability, even in the harshest environments. Designed to comply with international standards, these nuts are perfect for sectors like oil & gas, petrochemical, marine, and power generation. With cutting-edge manufacturing processes and strict quality control measures, Punit Fasteners guarantees that every product performs consistently, ensuring reliability and a long service life. This commitment makes us a go-to partner for Duplex fasteners, both in India and on the global stage.
When it comes to composition, Duplex Steel S31803 Nuts contain about 22% chromium, 5–6% nickel, 3% molybdenum, and nitrogen, all balanced with iron. This unique alloy creates a dual-phase microstructure of austenite and ferrite, which translates to superior mechanical properties and corrosion resistance. Typically, these nuts boast a tensile strength of around 620 MPa and a yield strength of approximately 450 MPa—significantly surpassing that of standard stainless steels. They also excel in resisting chloride-induced stress corrosion cracking, pitting, and crevice corrosion. The S31803 grade is particularly effective in challenging environments characterized by high salinity, acidic conditions, and substantial mechanical stress.
| S31803 | 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 % |
| S31803 | 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 |
| Specifications | ASTM A479 / ASME SA479 |
| Standards | DIN, ASTM, BS and all International Standards |
| Length | 3 mm to 200 mm |
| Size | M3 – M56 | 3/6″ to 2″ | Custom Sizes |
| Type | Hex Head Bolts, Square Bolts, U bolts, Eyebolts, T bolt, Hex Bolt, Lag Bolts, Countersunk Bolts, Hex Head nuts, Square nuts, Locknuts, Eye nuts, wing nuts, T nuts, Panel Nuts, Coupling Nuts, Dome nuts, Acorn Nuts |
To satisfy our clients needs by providing high quality products at competitive price as per the schedule and to maintain long term relationship with our clients.
Duplex Steel S31803 Nuts find their place in a variety of applications that demand both high strength and resistance to aggressive media. They are particularly well-suited for offshore oil platforms, chemical processing facilities, desalination plants, heat exchangers, and structural components in marine settings. Additionally, these nuts play a crucial role in the construction of pipelines, pressure vessels, and flanges within the power and energy sector. Thanks to their exceptional corrosion resistance and durability, S31803 nuts are ideal for fastening in tough environments where safety, reliability, and performance are paramount over extended periods.
Punit Fasteners is a leading manufacturer and supplier of high-quality fasteners in Delhi, India, with over 15 years of experience serving global industries.
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