321 Stainless Steel Wire UNS S32100

Alloy 321 is an austenitic chromium-nickel stainless steel containing Titanium.

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Shaped, Flat, Square, Round, Fine, Plated and Bare Wire ASTM A313, ASTM A240, ASTM 479, ASTM 580, AMS 5510, AMS 5645, AMS 5689

321 Alloy Description

Alloy 321 is an austenitic chromium-nickel stainless steel containing Titanium. The titanium addition reduces or prevents carbide precipitation during welding and in 800 – 1500°F (427 – 816°C) service. It also eliminates the need for an anneal after welding. Alloy 321 provides excellent resistance to oxidation and corrosion and possesses good creep strength.


Header bars for heat exchangers
Jet Engine parts

Chemistry Typical

Carbon: 0.08 max
Manganese: 2.00 max
Silicon: 0.75 max
Chromium: 17.00-19.00
Nickel: 9.00-12.00
Molybdenum: 0.75 max
Phosphorus: 0.045 max
Sulfur: .030 max
Copper: 0.75 max
Nitrogen: .010 max
Titanium: 5x(Carbon + Nitrogen) min-0.70 max
Iron: Balance

Physical Properties

Density: 0.29 lbs/in³, 9.01 g/cm³

Electrical Resistivity: microhm-in (microhm-cm)
68°F (20°C): 28.4 (72)

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): 9.3 (16.0)
At 932°F (500°C): 12.8 (22.0)

Mean Coefficient of Thermal Expansion: in/in/°F (μm/m•K)
32-212°F (0-100°C): 9.2 x 10 (16.6)
32-600°F (0-315°C): 9.5 x 10 (17.1)
32-1000°F (0-538°C): 10.3 x 10 (18.5)
32-1200°F (0-649°C): 10.7 x 10 (19.3)
32-1500°F (0-873°C): 11.2 x 10 (20.2)

Modulus of Elasticity: KSI (MPa)
28.0 x 10³ (193 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) 2500 – 2550 (1371 – 1400)

Mechanical Properties at Room Temperature

Properties: Annealed

Ultimate Tensile Strength: 75 KSI min (515 MPa min)
Yield Strength (0.2% Offset): 30 KSI min (250 MPa min)
Elongation: 40% min
Hardness: Rb 95 max

Properties Tempered

Alloy 321 can be cold rolled to achieve the temper properties required by specific customers and/or manufacturing requirements. Contact Ulbrich Wire for details.

Additional Properties

Corrosion Resistance

321 has excellent corrosion resistance equivalent to alloys 302 or 304 in the annealed
condition and superior if a weldment in these grades has not been post-weld annealed.
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 application.
Soap (round wire only): Soap is used as a lubricant in the drawing process and is 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


Continuous Coils
Cut to lengths
Precision cutting

Cold Forming

Alloy 321 can be readily formed and drawn.
Heat Treatment
Alloy 321 is non hardenable by heat treatment. It can only be hardened by cold working.

Stress Relieving

Heat to 1290°F (700°C) for 1 to 2 hours and then air cool.


Alloy 321 is weldable by common fusion and resistance methods. Use type 347 filler rod or electrodes. 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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