304L Stainless Steel Wire UNS S30403

Alloy 304L is an extra low-carbon variation of 304 making it useable in the “as-welded” condition (without annealing), even in severe corrosive conditions.

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Shaped, Flat, Square, Round, Fine Wire, Plated and Bare Wire AMS 5511, ASTM A240, ASTM A666

304L Alloy Description

Alloy 304L is an extra low-carbon variation of 304 making it useable in the “as-welded” condition (without annealing), even in severe corrosive conditions. The alloy has oxidation resistance to a maximum temperature of 1650°F (899°C) continuously without appreciable scaling. The maximum temperature for intermittent exposure is 1500°F (816°C). The only difference between 304 steel and 304L steel is the carbon content of each grade.


Chemistry Typical

Carbon: 0.03 max
Chromium: 18.00– 20.00
Manganese: 2.0 max
Nickel: 8.00– 12.00
Phosphorus : 0.045 max
Silicon: 1.0 max
Sulphur : 0.03 max
Iron: Balance

Physical Properties of 304L Stainless Steel

Density: 0.29 lbs/in³, 8.03 g/cm³

Electrical Resistivity: microhm-in, (microhm-cm)
At 68.0°F (20°C): 28.4(72)
At 1200°F (659°C): 45.8(116)

Specific Heat, BTU/lbs./°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): 9.4 (16.2)
At 932°F (500°C): 12.4 (21.4)

Mean Coefficient of Thermal Expansion, in/in/°F (µm/m•K))
32-212°F (0-100°C): 9.4 x 10 (16.9)
32-600°F (0-315°C): 9.6 x 10 (17.3)
32-1000°F (0-538°C): 10.2 x 10 (18.4)
32-1200°F (0-649°C): 10.4 x 10 (18.7)

Modulus of Elasticity, KSI (MPa)
28.0 x 10³ (193 x 10³) in tension 11.2 x 10³ (78 x 10³) in

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

Melting Range, °F (°C): 2550-2650 (1399-1454)

Mechanical Properties of 304L SS at Room Temperature

Annealed Condition Typical

Ultimate Tensile Strength: 70 KSI (485 MPa)
Yield Strength: 25 KSI (170)
Elongation: 40%
Hardness: B88

Tempered Condition

304L can be cold rolled to various tempers. Contact Ulbrich Wire Technical Service for
additional information

Additional Properties

304L Corrosion Resistance

Refer to NACE (National Association of Corrosion Engineers) for

Standard Wire Finishes for 304L SS

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 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
  • Finishing

Cold Forming Alloy 304L is ductile and can be cold worked by stamping, drawing, bending or
forming methods.

Heat Treatment Alloy 304L cannot be heat treated for hardness. Hardness can only be
achieved by cold working.

Welding Refer to SSINA’s ‘Welding of Stainless Steels and Other Joining Methods’ for best practices.

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

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