A516 Grade 70 is a medium-carbon steel under the ASTM standard in the United States, primarily used for boilers and pressure vessels operating at moderate or lower temperatures. Known for its excellent strength, toughness, and weldability, it is particularly suitable for applications requiring high reliability and pressure resistance. Compared with ordinary structural steels, A516 Grade 70 performs better in terms of pressure endurance and low-temperature impact resistance.
Its chemical composition is based on iron, with key elements including carbon, manganese, silicon, and strictly controlled amounts of sulfur and phosphorus. The carbon content is moderate, ensuring strength while maintaining weldability. Manganese increases both toughness and strength, silicon improves oxidation resistance, and low sulfur and phosphorus contents ensure good toughness and crack resistance. This well-balanced composition makes A516 Grade 70 strong yet highly workable.
In terms of applications, A516 Grade 70 is widely used in manufacturing pressure vessels, boilers, storage tanks, and heat exchangers for industries such as petroleum, chemical engineering, power generation, and natural gas. It is especially suitable for environments requiring high strength and low-temperature resistance. With its stable performance and excellent pressure resistance, this steel has become a standard choice for pressure vessel manufacturing in the international market.