Q1: What are the main characteristics of C276, Incoloy 800/800H, and Incoloy 825 pipes?
A1:
Hastelloy C276 (UNS N10276): Exceptional resistance to strong oxidizers, reducing agents, and localized corrosion.
Incoloy 800 / 800H (UNS N08800 / N08810): High strength and excellent resistance to oxidation and carburization at high temperatures.
Incoloy 825 (UNS N08825): Excellent resistance to sulfuric acid, phosphoric acid, and seawater corrosion.
Q2: What industries commonly use these nickel alloy pipes?
A2: They are widely used in chemical processing, oil and gas, petrochemical plants, power generation, marine engineering, and pollution control equipment, especially in harsh environments requiring corrosion and heat resistance.
Q3: How do these alloys compare with stainless steel pipes?
A3: Compared with stainless steel, C276 and Incoloy alloys provide superior resistance to pitting, crevice corrosion, and stress corrosion cracking. They also maintain mechanical strength at much higher temperatures, making them more suitable for extreme conditions.
Q4: What are the typical mechanical properties of these pipes?
A4: These alloys generally have high tensile strength (600–800 MPa), excellent ductility, and good creep resistance. For example, Incoloy 800H has enhanced creep-rupture properties at elevated temperatures due to its optimized carbon content.
Q5: What standards and sizes are available?
A5: Pipes are manufactured to ASTM B622 (C276), ASTM B407 (Incoloy 800/800H), and ASTM B423 (Incoloy 825). They are available in seamless and welded forms, with sizes typically ranging from 1/8" to 12", and custom lengths as required.
