309 stainless steel soft wire

Alloy 309 is an austenitic chromium nickel stainless steel known for its exceptional corrosion and oxidation resistance, especially at temperatures up to 2000ºF. This alloy boasts high tensile and creep strength at elevated temperatures, similar to that of 18-8 stainless steels. Additionally, it offers better resistance to marine environments compared to alloy 304. Due to these properties, Alloy 309 is often used in critical applications that demand durability and reliability.

Applications of Alloy 309

Typical applications of Alloy 309 include:

• Furnace Parts: Used in environments with extreme heat.
• Heat Exchangers: Ideal for transferring heat while maintaining structural integrity.
• Paper Mill Applications: Provides resistance to corrosive environments typically found in the paper industry.

Chemistry Composition

The typical chemistry for Alloy 309 includes:

• Carbon: 0.08 max
• Manganese: 2.00 max
• Silicon: 1.00 max
• Chromium: 22.00-24.00
• Nickel: 12.00-15.00
• Molybdenum: 0.75 max
• Phosphorus: 0.040 max
• Sulphur: 0.030 max
• Copper: 0.75 max
• Iron: Balance

Physical Properties

• Density: 0.289 lbs/in³ (9.01 g/cm³)
• Electrical Resistivity: 30.7 microhm-in (at 68°F)
• Thermal Conductivity:
  • At 212°F: 9.0 BTU/hr/ft²/ft/°F
  • At 932°F: 10.8 BTU/hr/ft²/ft/°F
• Mean Coefficient of Thermal Expansion:
  • 32-212°F: 8.3 x 10⁻⁶ in/in/°F
  • 32-1000°F: 9.6 x 10⁻⁶ in/in/°F

Mechanical Properties at Room Temperature

• Ultimate Tensile Strength: 75 KSI min (620 MPa min)
• Yield Strength (0.2% offset): 30 KSI min (205 MPa min)
• Elongation: 40% min
• Hardness: Rb 95 max

Alloy 309 can also be supplied in various rolled temper conditions, including forms like 309 stainless steel soft wire, catering to specific mechanical property requests. For those interested in high-performance materials, Stainless Steel Soft Wire options are available, offering versatility for various applications.