ASTM A453 Grade 660 Bolts: An Introduction ASTM A453 Grade 660 is a high-strength, heat-resistant steel alloy primarily used for bolts, fasteners, and other components that require exceptional mechanical properties at elevated temperatures. It is part of the ASTM A453 standard, which covers the specifications for high-temperature, bolting materials. Specifically, Grade 660 is one of the highest-grade materials in this category, designed to withstand the severe conditions of high-pressure, high-temperature environments. These bolts are typically used in applications in industries such as aerospace, power generation, petrochemical, and manufacturing of pressure vessels, where strength, resistance to corrosion, and thermal stability are critical. Uses of ASTM A453 Grade 660 Bolts ASTM A453 Grade 660 bolts are commonly used in applications requiring: 1. High-temperature environments – They are ideal for high-heat applications, such as in turbines, reactors, and heat exchangers, due to their excellent thermal resistance. 2. Aerospace– These bolts are utilized in aerospace engines and components that must perform at high altitudes and in high-stress environments. 3. Petrochemical and power plants – They are widely used in the chemical and energy sectors, where equipment is subjected to elevated temperatures and mechanical stress. 4. Pressure vessels – The material’s high strength makes it suitable for use in pressure vessels, where resistance to deformation under pressure is vital. Composition of ASTM A453 Grade 660 Bolts ASTM A453 Grade 660 bolts have a precise chemical composition that provides the desired mechanical properties. The general composition includes: - Nickel (Ni):14.0-17.0% - Chromium (Cr): 15.0-17.0% - Molybdenum (Mo): 1.5-3.0% - Titanium (Ti): 0.50-1.0% - Aluminum (Al): ≤ 0.5% - Carbon (C): 0.05-0.10% The balance of these elements ensures that ASTM A453 Grade 660 bolts are highly resistant to oxidation, scaling, and creep deformation, while also providing exceptional strength at elevated temperatures. Conclusion ASTM A453 Grade 660 bolts are a crucial component in industries where mechanical strength, corrosion resistance, and high-temperature performance are essential. Their unique composition and high strength make them suitable for demanding applications, especially in aerospace, petrochemical, and energy sectors. These bolts are designed to endure extreme conditions and maintain their integrity over long periods, ensuring the safety and reliability of critical systems. As a result, ASTM A453 Grade 660 is considered a top choice for high-performance fasteners in harsh operating environments. If you have any requirement, please call us on +91 9920177883 or email us on sales@sagarsteel.net