Also known as XM-7, 304CU, 304HQ Shaped, Flat, Square, Round, Fine Wire, Plated and Bare Wire ASTM A493

302HQ Alloy Description

With the addition of 3.0-4.0 % copper, alloy 302HQ becomes a specialized wire alloy with an extremely low work hardening rate. This makes the alloy ideal for cold heading applications. The alloy is nonmagnetic in the annealed condition and remains non-magnetic even after substantial cod working. It has excellent toughness even down to cryogenic temperatures.

Applications

Applications that require severe cold working.
Cold heading applications such as bolts, self- tapping screws and blind rivets


Chemistry Typical

Carbon: 0.08 max
Phosphorus: 0.045 max
Silicon: 1.00 max
Nickel: 8.00-10.00
Chromium: 17.00-19.00
Manganese: 2.00 max
Copper: 3.00-4.00
Sulfur: 0.030 max
Iron: Balance


Physical Properties

Density: 0.289lb/in³, 8.00 g/cm³

Electrical Resistivity: ohm-m: 0.00720

Mean Specific Heat: BTU/lb-°F (J/g-°C):
32-212°F (0-100°C): 0.120 (.502)

Thermal Conductivity: BTU-in/hr-ft²-°F (W/m•K)
At 212°F (100°C): 113 (16.3)

Mean Coefficient of Thermal Expansion: µin/in-°F (µm/m-°C)
32-212°F (0-100 °C):9.61 (17.3)
32-599°F (0-315 °C): 9.89 (17.8)
32-1000°F (0-540 °C): 10.20 (18.4)
32-1200°F (0-650 °C): 10.4 (18.7)

Modulus of Elasticity: KSI (MPa)
29 x 10³Ksi(200 x 10³) in tension

Melting Range: 2552-2561°F (°1400-1455C)


Mechanical Properties at Room Temperature

Properties: Annealed Typical

Ultimate Tensile Strength: 70KSI min (438 MPa min)
Yield Strength: 30 KSI (207 MPa min)
Elongation: 25% min


Properties: Tempered

Alloy 302HQ can be cold worked to additional tempers. Contact UlbrichShaped Wire
Technical Service for additional information


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 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 requests.

Forms

Continuous Coils
Cut to lengths
Precision cutting


Heat Treatment

Alloy 302HQ is non hardenable by heat treatment.


Welding

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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