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Punit Fasteners is a leading manufacturer and supplier of Duplex Steel Fasteners in Delhi, India. We offer a broad range of duplex fasteners, including bolts, nuts, studs, and washers, designed to endure extreme environments. Made from high-quality duplex stainless steel, our fasteners combine strength and excellent corrosion resistance. Punit Fasteners ensures quality and precision in production to meet international standards like ASTM, DIN, and ISO. With uses in marine, petrochemical, and power generation sectors, we provide custom specifications, competitive prices, and timely delivery. Choose Punit Fasteners for reliable and high-performance Duplex Steel Fasteners that withstand pressure.
Duplex Steel Fasteners are composed of about 22 to 25% chromium, 4 to 7% nickel, and 3 to 5% molybdenum, with added nitrogen. This unique two-phase microstructure gives them strong mechanical properties and corrosion resistance. They show tensile strength between 620 and 880 MPa and yield strength of 450 to 550 MPa. Duplex fasteners resist chloride stress corrosion cracking, pitting, and crevice corrosion. Their hardness typically ranges from 25 to 35 HRC. These properties make duplex steel fasteners ideal for tough applications that require durability and protection against corrosion, along with mechanical stability under high stress.
| Phosphorus | Sulphur | Silicon | Carbon | Manganese | Nickel | Molybdenum | Nitrogen | Copper | Chromium |
|---|---|---|---|---|---|---|---|---|---|
| 0.035 % max | 0.02 % max | 0.80 % max | 0.03% Max | 1.20 % max | 6.00 – 8.00 % | 3.00 – 5.00 % | 0.24 – 0.32 % | 0.50 % max | 24.0 – 26.0 % |
| Grade | YS (MPa) | UTS (MPa) | % Elongation | Hardness(BHN) |
| UNS S32750 | 550 min. | 795 min. | 15 min. | 310 max. |
| UNS S32760 | 550 min. | 750 min. | 25 min. | 270 max. |
| Specifications | : | ASTM A182 / ASME SA182 |
| Size | : | 1/8″ NB TO 24″ NB |
| Standards | : | ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc. |
| Class / Pressure | : | 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc. |
| Standard | : | ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc. |
| Grades | : | S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F6 |
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 Fasteners are widely used in chemical processing, offshore oil drilling, and desalination plants because of their strong resistance to corrosive environments. In the marine and shipbuilding industries, these fasteners help prevent damage from saltwater and harsh weather. They are also crucial in pulp and paper, heat exchangers, and structural engineering, where high tensile strength and resistance to corrosion fatigue are essential. The power generation, water treatment, and gas industries depend on duplex fasteners for secure and reliable joints. Their low thermal expansion and good weldability enhance their usability in both high and low-temperature operations.
At Punit Fasteners, we prioritize the safe packaging of Duplex Steel Fasteners to maintain their quality and prevent damage. Each binder is thoroughly inspected and wrapped in protective packaging to ensure it arrives in the best possible condition. We offer a range of packaging options, including drop boxes and containers in sizes to suit your needs. Our durable packaging solutions protect your fasteners during transit and storage, assuring they are ready for immediate use in your most demanding applications.
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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