Stainless Steel 309H Fasteners: High Quality and Versatility at ASC LLP
Stainless steel fasteners are essential components in various industries due to their durability, resistance to corrosion, and excellent performance in challenging environments. Among the many grades of stainless steel, 309H stands out as a high-performance alloy that offers exceptional strength and stability at high temperatures. In this article, we’ll explore the key aspects of 309H stainless steel fasteners, including their properties, advantages, and applications, to provide a comprehensive understanding of why these fasteners are an ideal choice for demanding applications.
What is 309H Stainless Steel Fasteners?
309H stainless steel fasteners are made from an alloy that belongs to the austenitic family of stainless steels. The “H” in 309H indicates that it has a higher carbon content than its counterpart, 309, which enhances its high-temperature properties. These fasteners are particularly useful in environments where resistance to oxidation, corrosion, and heat is crucial.
The stainless steel 309H fasteners are commonly used in applications that involve exposure to high temperatures, such as furnace parts, heat exchangers, and boilers. The material’s ability to withstand such extreme conditions without losing its strength makes it an essential component in industries like petrochemicals, power generation, and metallurgy.
309H Stainless Steel Fasteners Properties
The unique properties of 309H stainless steel fasteners are what makes them suitable for challenging applications. Here are some of the key characteristics:
- High-Temperature Resistance: One of the primary reasons for choosing 309H SS fasteners is their exceptional resistance to high temperatures. With a high carbon content, 309H fasteners can maintain their mechanical strength and oxidation resistance at temperatures up to 1038°C (1900°F). This makes them ideal for use in environments where extreme heat is a constant factor.
- Corrosion Resistance: Like other stainless steels, SS 309H fasteners offer good resistance to corrosion, particularly in mild environments. They exhibit excellent resistance to oxidation and sulfidation at high temperatures, which adds to their durability in aggressive conditions.
- Mechanical Strength: The increased carbon content in 309H provides enhanced tensile strength and creep resistance at elevated temperatures. This allows 309H stainless steel fasteners to maintain their integrity even under prolonged stress, making them suitable for high-stress environments.
- Oxidation Resistance: Stainless steel 309H fasteners demonstrate outstanding resistance to oxidation due to the presence of chromium in the alloy. The chromium forms a passive layer on the surface, protecting the fasteners from oxidation, which can occur at high temperatures or in oxygen-rich environments.
- Weldability: Although 309H stainless steel is harder than other stainless steel due to its high carbon content, it still offers good weldability. This is important for applications that require fasteners to be securely installed in assemblies where welding is necessary.
309H Stainless Steel Fasteners Advantages
When it comes to choosing fasteners for high-temperature or corrosive environments, 309H stainless steel fasteners offer several advantages over other materials. Here are the key benefits:
- Superior High-Temperature Performance: The 309H-grade stainless steel fasteners are specifically designed to perform well in extreme heat. Unlike standard fasteners, which may weaken or deform when exposed to high temperatures, 309H stainless steel fasteners maintain their strength and resist oxidation, making them ideal for applications in furnaces, boilers, and heat treatment equipment.
- Corrosion and Oxidation Resistance: In industries where exposure to corrosive environments is inevitable, stainless steel 309H fasteners provide the necessary protection against rust and oxidation. This is particularly useful in industries like petrochemical, where fasteners are exposed to harsh chemicals and high temperatures simultaneously.
- Longevity and Durability: Due to their strength and resistance to high-temperature corrosion, 309H stainless steel fasteners offer a longer service life compared to standard fasteners. This reduces the need for frequent replacements, saving both time and costs for maintenance in high-performance applications.
- Cost-Effective in the Long Run: Although SS 309H fasteners might have a higher upfront cost compared to regular fasteners, their durability, and resistance to heat and corrosion make them a cost-effective solution in the long term. These fasteners reduce the likelihood of system failure and the need for replacements, ensuring reliability in critical systems.
- Versatility: The versatility of 309H SS fasteners allows them to be used in a wide range of applications, from industrial furnaces to chemical processing plants. Their ability to handle both extreme heat and corrosive environments makes them highly valuable in industries that require resilient materials.
Schedule and Size Chart
| Nominal Size (Inches) | Thread Type | Thread Pitch (TPI) | Length (mm) | Diameter (mm) |
| 1/4″ | UNC/UNF | 20/28 | 6 – 100 | 6.35 |
| 3/8″ | UNC/UNF | 16/24 | 8 – 150 | 9.53 |
| 1/2″ | UNC/UNF | 13/20 | 10 – 200 | 12.7 |
| 5/8″ | UNC/UNF | 11/18 | 12 – 250 | 15.88 |
| 3/4″ | UNC/UNF | 10/16 | 14 – 300 | 19.05 |
| 1″ | UNC/UNF | 8/12 | 20 – 350 | 25.4 |
Mechanical Properties Chart
| Property | Value | Unit |
| Tensile Strength | 585 MPa | MPa |
| Yield Strength (0.2% offset) | 275 MPa | MPa |
| Elongation (in 50mm) | 40% | % |
| Hardness (Rockwell B) | 85 | HRB |
| Modulus of Elasticity | 200 GPa | GPa |
| Creep Strength (600°C, 10,000 hrs) | 13 MPa | MPa |
Specifications Chart
| Specification Standard | Details |
| ASTM/ASME Standard | ASTM A193, ASTM A194, ASME SA193, ASME SA194 |
| DIN Standard | DIN 933, DIN 931 |
| BS Standard | BS EN 3506 |
| ISO Standard | ISO 3506-1 |
| UNS Number | S30909 |
| EN Number | 1.4828 |
Chemical Composition Chart
| Element | Composition (%) |
| Chromium (Cr) | 22.0 – 24.0 |
| Nickel (Ni) | 12.0 – 15.0 |
| Carbon (C) | 0.04 – 0.10 |
| Manganese (Mn) | 2.0 Max |
| Silicon (Si) | 1.0 Max |
| Phosphorus (P) | 0.045 Max |
| Sulfur (S) | 0.030 Max |
| Nitrogen (N) | 0.10 Max |
| Iron (Fe) | Balance |
Physical Properties Chart
| Physical Property | Value | Unit |
| Density | 7.89 g/cm³ | g/cm³ |
| Melting Point | 1399 – 1421°C | °C |
| Thermal Conductivity (100°C) | 14.6 W/m·K | W/m·K |
| Specific Heat (0-100°C) | 500 J/kg·K | J/kg·K |
| Electrical Resistivity | 0.94 µΩ·m | µΩ·m |
| Thermal Expansion (0-100°C) | 15.9 µm/m·K | µm/m·K |
Application Chart
| Industry | Applications |
| Petrochemical | Heat exchangers, pressure vessels, catalytic converters. |
| Power Generation | Boilers, gas turbines, heat recovery systems. |
| Furnaces | Industrial furnace components, furnace fasteners, refractory anchors. |
| Chemical Processing | Chemical reactors, storage tanks, equipment for acid production. |
| Automotive | Exhaust systems, catalytic converters, engine components. |
| Aerospace | Jet engines, exhaust systems, high-temperature fastening applications. |
| Construction | High-rise buildings, bridges, and structural components that require heat resistance. |
309H stainless steel fasteners are an excellent choice for industries that require fasteners capable of withstanding high temperatures and corrosive environments. Their unique properties, including high-temperature resistance, corrosion resistance, mechanical strength, and oxidation resistance, make them indispensable in applications such as petrochemical processing, power generation, and industrial furnaces.
At ASC LLP, we are committed to providing top-quality stainless steel fasteners that meet the rigorous demands of modern industries. Our 309H SS fasteners are manufactured to the highest standards to ensure reliable performance in even the most extreme conditions. Whether you’re in need of fasteners for high-heat applications or corrosive environments, SS 309H fasteners are a cost-effective and durable solution that will deliver exceptional results.
Global Reach
Amardeep Steel Centre boasts a robust global presence and is committed to delivering unparalleled service and quality to clients around the world. Our dedication to prompt delivery and exceptional customer care sets us apart in the industry. Major corporations across the USA, Europe, Asia, and other regions place their trust in our high-quality Stainless Steel 309H Fasteners. This widespread trust underscores our reputation for reliability and excellence. By consistently meeting and exceeding the expectations of our international clientele, we continue to solidify our position as a leader in the global steel market.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
