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Punit Fasteners is a reliable manufacturer and supplier of Stainless Steel 309/309S Nuts based in Delhi, India. We specialize in providing precision-engineered fastening solutions that are perfect for high-temperature and corrosive environments. Stainless Steel 309 is an austenitic alloy known for its outstanding oxidation resistance and strength at elevated temperatures, while 309S is a low-carbon variant that enhances weldability and minimizes the risk of carbide precipitation. Our SS 309/309S Nuts find extensive use in industries like heat treatment, petrochemical, power generation, and furnace manufacturing, where heat and corrosion resistance are crucial.
These nuts typically contain 22–24% chromium and 12–15% nickel, which give them excellent oxidation resistance up to 1000°C. The lower carbon content in 309S (capped at 0.08%) boosts resistance to intergranular corrosion during welding. With a tensile strength of around 550 MPa, these nuts also exhibit great creep resistance and maintain their mechanical stability at high temperatures, making them ideal for thermal applications.
Element | Content (%) |
Iron, Fe | 60 |
Chromium, Cr | 23 |
Nickel, Ni | 14 |
Manganese, Mn | 2 |
Silicon, Si | 1 |
Carbon, C | 0.20 |
Phosphorous, P | 0.045 |
Sulfur, S | 0.030 |
Properties | Metric | Imperial |
Tensile strength | 620 MPa | 89900 psi |
Yield strength (@ strain 0.200%) | 310 MPa | 45000 psi |
Izod impact | 120 – 165 J | 88.5 – 122 ft-lb |
Shear modulus (typical for steel) | 77 GPa | 11200 ksi |
Elastic modulus | 200 GPa | 29008 ksi |
Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
Elongation at break (in 50 mm) | 45% | 45% |
Hardness, Brinell | 147 | 147 |
Hardness, Rockwell B | 85 | 85 |
Hardness, Vickers (converted from Rockwell B hardness) | 169 | 169 |
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.
You’ll find Stainless Steel 309/309S Nuts widely used in furnaces, heat exchangers, combustion chambers, kilns, and other high-temperature processing equipment. They’re also utilized in flue gas systems, thermal oxidizers, and incinerators within the petrochemical and chemical sectors. Their ability to resist scaling, thermal fatigue, and corrosion in extreme heat conditions makes them a dependable choice for fastening in harsh environments. These nuts promise a long service life and maintain structural integrity, even when subjected to frequent thermal cycling and aggressive industrial atmospheres.
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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