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MUKAU FASTENERS, a prominent manufacturer and supplier located in Kinshasa, Congo, specializes in high-quality Stainless Steel 309/309S Fasteners that are engineered for outstanding performance in high-temperature and corrosive settings. Crafted from austenitic stainless steel with a rich blend of chromium and nickel, these fasteners boast exceptional oxidation and heat resistance. The 309S grade, featuring lower carbon content, improves weldability and minimizes carbide precipitation. MUKAU FASTENERS is committed to precision manufacturing and adheres to international standards, providing 309/309S Fasteners that ensure durability, mechanical strength, and long-lasting reliability. These fasteners are commonly utilized in furnaces, heat exchangers, petrochemical plants, and power generation facilities.
Stainless Steel 309/309S Fasteners are composed of roughly 23–25% chromium, 12–15% nickel, and a maximum of 0.08% carbon (with 309S having a lower carbon content). This unique blend grants them remarkable high-temperature strength, oxidation resistance, and corrosion resistance in both oxidizing and mildly corrosive environments. They demonstrate a tensile strength of about 515 MPa and a yield strength close to 205 MPa, while also maintaining ductility and toughness even at elevated temperatures. The alloy’s well-balanced composition ensures it can withstand scaling and thermal fatigue, making these fasteners dependable for extended exposure to extreme heat and industrial conditions.
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.
Stainless Steel 309/309S Fasteners are extensively utilized in furnaces, heat treatment equipment, boilers, power plants, petrochemical facilities, and chemical processing units, thanks to their impressive high-temperature strength and corrosion resistance. They are perfect for exhaust systems, burners, flue ducts, and thermal processing machinery that operate under constant heat and pressure. The 309S variant is especially well-suited for welded assemblies and applications that demand enhanced formability. Additionally, these fasteners are also used in marine applications, showcasing their versatility and reliability in various industrial settings.
At Mukau Fasteners, our commitment to quality is unwavering, as evidenced by the rigorous testing procedures applied to all Stainless Steel 309/309S fasteners before shipment. These advanced tests include hardness, chemical analysis by Spectro analysis, positive material identification (PMI), levelling, micro-macro, pitting resistance, fire and intergranular corrosion (IGC) testing. Furthermore, we offer third-party inspection certifications to ensure our fasteners are of the highest quality and reliable for demanding applications.
Mukau Fasteners is a leading manufacturer and supplier of high-quality fasteners in Kinshasa, Congo, with over 8 years of experience serving global industries.
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