Stainless Steel - Grade 218 / 1.3964
Description
Alloy 218/1.3964, also known as NITRONIC® 60, is a high-performance austenitic stainless steel designed for high-temperature applications. It exhibits excellent resistance to corrosion, wear, and galling, making it suitable for various demanding environments.
Chemical Composition
The chemical composition of Alloy 218 is as follows:
- Chromium (Cr): 17% - 18%
- Nickel (Ni): 8% - 9%
- Manganese (Mn): 7% - 9%
- Silicon (Si): 3.5% - 4.5%
- Nitrogen (N): 0.08% - 0.18%
- Carbon (C): 0.10% max
- Iron (Fe): Balance
Mechanical Properties
The mechanical properties of Alloy 218/1.3964 vary based on the size of the bar:
- Ultimate Tensile Strength:
- For bars ≤ 0.5": 724 MPa (105 Ksi)
- For bars > 0.5": 655 MPa (95 Ksi)
- Yield Strength (0.2% Offset):
- For bars ≤ 0.5": 379 MPa (55 Ksi)
- For bars > 0.5": 345 MPa (50 Ksi)
- Elongation in 4D: 35%
- Hardness: Typically ≤ 241 HB
Thermal & Physical Properties
- Melting Point: Approximately 1400 - 1450 °C
- Density: Approximately 8.0 g/cm³
- Thermal Conductivity: 16.3 W/m•K
Other Designations
- DIN Number: 1.3964
- Other Designations: AISI 218, ASTM A276, ASTM A479, AMS 5848
Fabrication and Heat Treatment
Alloy 218/1.3964 can be fabricated using standard techniques for stainless steels. It can be welded using various methods, including TIG and MIG welding. Heat treatment is typically not required for this alloy; however, it can be solution annealed at temperatures of 1040 - 1120 °C followed by rapid cooling.
Applications
Alloy 218/1.3964 is widely used in applications that require high strength and corrosion resistance, including:
- Marine components
- Automotive valves
- Fasteners
- Pins for prosthetics
- Expansion joints in bridges
Supplied Forms
Alloy 218 is supplied in various forms, including:
Features
- Excellent resistance to galling and wear
- High strength at elevated temperatures
- Good resistance to pitting and crevice corrosion
- Suitable for use in harsh environments
This datasheet provides a comprehensive overview of Alloy 218 (NITRONIC® 60), highlighting its properties and applications, ensuring it meets the needs of various industries.