Q1: What is the difference between Hastelloy C22 and Inconel 718 tubes?
A1: Hastelloy C22 is a nickel-chromium-molybdenum alloy designed for exceptional resistance to aggressive oxidizing and reducing chemicals, making it ideal for chemical processing. Inconel 718, on the other hand, is a precipitation-hardenable nickel-chromium alloy known for outstanding high-strength performance at temperatures up to 700°C (1290°F), making it suitable for aerospace and high-stress industrial applications.
Q2: What standards apply to Hastelloy C22 seamless tubes?
A2: Hastelloy C22 seamless tubes are manufactured according to ASTM B622, which specifies requirements for seamless nickel and nickel-cobalt alloy tubes, including dimensional tolerances, chemical composition, and mechanical properties.
Q3: What are the main applications of Hastelloy C22 seamless tubes?
A3: They are widely used in pollution control systems, flue gas scrubbers, pulp and paper bleaching, marine environments, and chemical processing plants where protection against strong oxidizers and chlorides is required.
Q4: What are the key mechanical properties of Inconel 718 tubes?
A4: Inconel 718 tubes offer excellent tensile and yield strength, fatigue resistance, and creep-rupture strength. They retain toughness and stability in both cryogenic conditions and high-temperature service, making them highly reliable for demanding structural and pressure applications.
Q5: What testing and inspection methods are typically performed on these alloy tubes?
A5: Common testing includes tensile strength testing, hardness testing, hydrostatic or pneumatic pressure tests, non-destructive testing (ultrasonic or eddy current), chemical composition analysis, and dimensional inspections to ensure compliance with ASTM and industry standards.
