Stainless Steel 347 Fasteners: High Quality and Versatility at ASC LLP
Stainless steel fasteners are essential components in various industries due to their exceptional durability, corrosion resistance, and high performance under extreme conditions. Among the many grades available, 347 stainless steel fasteners stand out as a preferred choice for high-temperature environments and applications requiring superior resistance to corrosion and oxidation. In this article, we will dive into the details of stainless steel 347 fasteners, their properties, their advantages, and why they are commonly used across various industries.
What are 347 Stainless Steel Fasteners?
347 stainless steel fasteners are mechanical components, such as bolts, nuts, screws, washers, and studs, made from 347 stainless steel. These fasteners are designed to hold structures together and provide superior strength, durability, and resistance to various types of stress, including tension, shear, and corrosion.
Stainless steel fasteners made from 347 stainless steel are commonly used in industries like petrochemicals, aerospace, oil and gas, power generation, and food processing, where materials are regularly exposed to high temperatures and corrosive substances.
Properties of 347 Stainless Steel Fasteners
The properties of 347 stainless steel fasteners make them a standout choice for various applications. Below are some key 347 stainless steel fastener properties:
- Corrosion Resistance: One of the primary properties of SS 347 fasteners is their exceptional resistance to corrosion, especially in environments with exposure to harsh chemicals, acids, and high temperatures. The columbium stabilization helps prevent intergranular corrosion, which occurs when grain boundaries within the material become weak and prone to cracking.
- High-Temperature Strength: 347 SS fasteners retain their strength and integrity even at elevated temperatures, making them suitable for use in environments that reach up to 1500°F (816°C). This makes them ideal for use in industries like aerospace, chemical processing, and power generation, where heat exposure is frequent.
- Oxidation Resistance: The material’s high chromium content provides 347 SS fasteners with excellent oxidation resistance. This allows them to perform well in environments with exposure to oxygen at high temperatures without losing structural integrity.
- Good Mechanical Properties: SS fasteners 347 have good mechanical properties, including high tensile strength and excellent toughness, even at low temperatures. This makes them versatile for various applications that demand strength and reliability.
- Resistance to Sensitization: Sensitization is a process where chromium carbides form at grain boundaries when the material is heated within the temperature range of 800°F to 1500°F. These carbides deplete the chromium content at grain boundaries, making the material more susceptible to corrosion. The addition of columbium (niobium) in 347 stainless steel prevents this from happening, allowing 347 stainless steel fasteners to maintain their resistance to corrosion even after being exposed to high temperatures.
Advantages of 347 Stainless Steel Fasteners
347 stainless steel fasteners offer numerous advantages over other types of fasteners, making them a preferred choice in many industries. Some of the key 347 stainless steel fasteners advantages include:
- Superior Corrosion Resistance: Thanks to their high chromium and niobium content, 347-grade stainless steel fasteners offer superior resistance to various forms of corrosion, including general corrosion, pitting, crevice corrosion, and stress-corrosion cracking. This makes them suitable for use in harsh environments such as marine, chemical processing, and oil refineries.
- Long-Lasting Performance: 347 stainless steel fasteners have a long service life, even when subjected to extreme conditions such as high temperatures, corrosive chemicals, and high-pressure environments. Their durability and ability to maintain their strength over time reduce the need for frequent replacements and repairs.
- Resistance to High Temperatures: Unlike other stainless steel grades, 347 SS fasteners can withstand prolonged exposure to high temperatures without losing their strength or becoming brittle. This makes them suitable for applications that involve heating equipment, boilers, and other high-temperature machinery.
- Prevention of Carbide Precipitation: The addition of columbium in 347 stainless steel helps prevent the formation of chromium carbides at grain boundaries. This allows 347 SS fasteners to maintain their corrosion resistance even after being exposed to temperatures within the carbide precipitation range, which is essential for long-term performance.
- Versatility in Application: Due to their combination of corrosion resistance, heat resistance, and mechanical strength, 347 SS fasteners can be used in a wide range of applications. Whether it’s in aerospace, chemical processing, or food production, these fasteners offer reliable performance across different industries.
- Cost-Effective Solution: While 347 SS fasteners may have a higher initial cost compared to other grades, their long-term performance and durability often result in cost savings over time. Industries that require fasteners with extended service life and minimal maintenance can benefit from the cost-effectiveness of using 347 SS fasteners.
Schedule and Size Chart
| Nominal Size (inches) | Thread Size (TPI) | Length (inches) | Diameter (inches) | Weight (lbs) |
| 1/4″ | 20 | 1/2″ – 2″ | 0.25 | 0.03 |
| 3/8″ | 16 | 3/4″ – 3″ | 0.375 | 0.05 |
| 1/2″ | 13 | 1″ – 6″ | 0.5 | 0.07 |
| 5/8″ | 11 | 1-1/4″ – 6″ | 0.625 | 0.1 |
| 3/4″ | 10 | 1-1/2″ – 6″ | 0.75 | 0.13 |
| 1″ | 8 | 2″ – 8″ | 1 | 0.2 |
Mechanical Properties Chart
| Property | Value |
| Tensile Strength | 515 MPa (75,000 psi) |
| Yield Strength (0.2% offset) | 205 MPa (30,000 psi) |
| Elongation | 40% (in 50 mm) |
| Hardness | Rockwell B (HR B) – 95 |
| Modulus of Elasticity | 193 GPa (28 x 10⁶ psi) |
| Poisson’s Ratio | 0.27 – 0.30 |
| Impact Strength | Good (suitable for high temperatures) |
Specifications Chart
| Specification | Standard |
| ASTM | ASTM A193 / A194 (for bolts and nuts) |
| ASME | ASME B18.2.1 / B18.2.2 (for dimensional tolerance) |
| DIN | DIN 1.4550 (for material specifications) |
| ISO | ISO 3506-1 (for general fastener specifications) |
| UNS | UNS S34700 |
Chemical Composition Chart
| Element | Percentage (%) |
| Chromium (Cr) | 17.00 – 19.00 |
| Nickel (Ni) | 9.00 – 12.00 |
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.03 max |
| Silicon (Si) | 1.00 max |
| Columbium (Nb) | 10 x C – 1.00 |
| Iron (Fe) | Balance |
Physical Properties Chart
| Property | Value |
| Density | 7.93 g/cm³ (0.286 lb/in³) |
| Melting Point | 1398°C – 1446°C (2550°F – 2635°F) |
| Thermal Conductivity | 16.3 W/m-K (9.4 BTU/hr ft²/°F) at 100°C |
| Specific Heat | 0.12 J/g°C (0.12 BTU/lb-°F) at 20°C |
| Electrical Resistivity | 0.73 µΩ-m at 20°C (70°F) |
| Thermal Expansion Coefficient | 17.2 µm/m-°C (9.6 µin/in°F) at 100°C |
| Modulus of Elasticity | 193 GPa (28 x 10⁶ psi) |
Applications Chart
| Industry | Applications |
| Aerospace | Jet engines, turbine blades, exhaust systems, heat shields |
| Petrochemical | Chemical reactors, refinery equipment, piping systems |
| Power Generation | Boilers, superheaters, nuclear reactors, heat exchangers |
| Oil & Gas | Pipeline systems, drilling rigs, offshore platforms |
| Food Processing | Food handling equipment, storage tanks, processing machinery |
| Pharmaceutical | Sterilization equipment, high-temperature reactor vessels |
| Automotive | Exhaust systems, turbochargers, high-temperature engine components |
347 stainless steel fasteners provide an ideal solution for industries that require fasteners with high corrosion resistance, excellent mechanical strength, and the ability to withstand elevated temperatures. The unique combination of properties offered by 347-grade stainless steel fasteners ensures reliable performance in demanding applications, making them a cost-effective and durable choice for various industrial uses.
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 347 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.
