309 Stainless Steel Wire UNS S30908

Alloy 309 is an austenitic chromium nickel stainless steel and is used in applications requiring both corrosion resistance along with oxidation resistance up to 2000ºF.

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Shaped, Flat, Square, Round, Fine Wire, Plated and Un-plated Wire ASTM A 167, ASTM A276, ASTM 580, AMS 5523

309 Alloy Description

Alloy 309 is an austenitic chromium nickel stainless steel and is used in applications requiring both corrosion resistance along with oxidation resistance up to 2000ºF. This alloy posses high tensile and creep strength at elevated temperatures. Strength at elevated temperatures is similar to that of 18-8 Stainless Steels. It is more resistant to marine atmospheres than alloy 304.


Furnace parts
Heat Exchangers
Paper Mill applications

Chemistry Typical

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, microhm-in (microhm-cm)
68°F (20°C) – 30.7 (78.0)

Specific Heat, BTU/lb/°F (kJ/kg•K
32-212°F (0-100°C): 0.12 (0.50)

Thermal Conductivity, BTU/hr/ft²/ft/°F (W/m•K)
At 212°F (100°C): 9.0 (15.6)
At 932°F (500°C): 10.8 (18.7)

Mean Coefficient of Thermal Expansion: in/in/°F (μm/m•K)
32-212°F (0-100°C): 8.3 x 10 (14.9)
32-600°F (0-315°C): 9.3 x 10 ((16.7)
32-1000°F (0-538°C): 9.6 x 10 ((17.3)
32-1200°F (0-649°C): 10.0x 10 ((18.0)

Modulus of Elasticity, KSI (MPa)
29.0 x 10³ (200 x 10³) in tension
11.2 x 10³ ( 78 x 10³) in torsion

Magnetic Permeability, H = 200 Oersteds: Annealed <1.02 max.

Melting Range, °F (°C) 2550 – 2590 (1399 – 1454)

Mechanical Properties at Room Temperature

Properties: Typical

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


Alloy 309 can be supplied in various rolled to temper conditions. Contact Ulbrich Wire with special mechanical property requests

Additional Properties

Corrosion Resistance

Refer to NACE (National Association of Corrosion Engineers) for recommendations
Standard Wire Finishes Extra Clean: (XC) Extra clean is also referred to as “bright annealed” or “bright annealed and cold rolled”
Grease (round wire only): Drawn in a heavy grease produces an “Ultra bright” finish for decorative applications
Soap (round wire only): Soap is used as a lubricant in the drawing process andis not removed. It acts as a lubricant during customer part forming operation. A soap finish is available in tempered products
Plated: Many plating options are available.
∗ Special finishes are available: Contact Ulbrich Wire Sales with special finish and plating request


Continuous Coils
Cut to lengths
Precision cutting

Cold Forming

Alloy 309 can be rolled formed, stamped and drawn readily. In-process annealing is usually required to reduce hardness and increase ductility

Heat Treatment

Alloy 309 can only be hardened by cold working


For best results refer to: SSINA’s “Welding of Stainless Steels and Other Joining Methods”

Limitation of Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels and Special Metals, Inc., be liable for any damages arising from the use of the information included in this document or that it is suitable for the ‘applications’ noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. Ulbrich assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.

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