Here are five questions and their answers regarding Corrosion Resisting Nickel Alloy Incoloy Rod 718, 800, 800H, and 800HT Bar/Rod:
1. What are the primary applications of Incoloy alloys 718, 800, 800H, and 800HT?
Answer:
Incoloy alloys are primarily used in high-temperature and corrosion-resistant applications. Incoloy 718 is commonly used in the aerospace, power generation, and chemical processing industries due to its high strength and resistance to oxidation at high temperatures. Incoloy 800, 800H, and 800HT are used in industries such as petrochemical, heat exchangers, power plants, and furnace components, where resistance to carburization and oxidation at elevated temperatures is essential.
2. What are the main differences between Incoloy 800, 800H, and 800HT?
Answer:
Incoloy 800: Offers excellent resistance to oxidation and carburization, primarily used in applications that require good weldability and formability.
Incoloy 800H: An improved version of Incoloy 800, specifically designed to handle higher temperatures (up to 1100°F) and offers enhanced creep and stress rupture properties.
Incoloy 800HT: A further refinement of 800H, providing even greater resistance to oxidation and creep at high temperatures, making it ideal for use in more demanding environments, such as in heat exchangers.
3. What are the typical mechanical properties of these Incoloy alloys?
Answer:
The mechanical properties vary by alloy:
Incoloy 718: Yield strength of approximately 1,000 MPa, tensile strength around 1,400 MPa, and elongation of about 15%.
Incoloy 800: Yield strength of approximately 240 MPa, tensile strength of 550 MPa, and elongation of around 40%.
Incoloy 800H and 800HT: Yield strength of about 250 MPa, tensile strength of 600 MPa, and elongation of approximately 30%. These alloys exhibit excellent creep and stress rupture strength at high temperatures.
4. How does Incoloy 718 resist corrosion?
Answer:
Incoloy 718 is highly resistant to a variety of corrosive environments, including sulfuric acid, nitric acid, and chlorine-based environments. Its resistance comes from the alloy's high nickel content (around 50%), which helps protect it from oxidation, pitting, and stress-corrosion cracking. Additionally, it has a balanced composition of chromium and molybdenum that further enhances its ability to withstand oxidation and other forms of corrosion at elevated temperatures.
5. What is the typical fabrication process for Incoloy Rods/Bars?
Answer:
Incoloy rods and bars are typically produced through processes such as hot working (forging and rolling) followed by cold working (drawing and annealing). These processes ensure the alloy maintains its strength and corrosion resistance. The rods and bars are then heat-treated to enhance mechanical properties like hardness and toughness. The final products are often used for manufacturing parts that require precision machining or welding in corrosive and high-temperature environments.
