Also known as XM-7, 304CU, 304HQ Coil, Wire, ASTM A493 


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


Alloy 302HQ is a specialized wire alloy where the addition of 3.00-4.00 copper substantially reduces the cold work hardening rate over 304 stainless. The alloy is non-magnetic in the annealed condition and remains non-magnetic even after substantial cod working. It has excellent toughness even down to cryogenic temperatures.  

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: 0.289 lbs/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 103 (200 x 103) in tension  Melting Range: 2552 - 2561 °F (1400 - 1455 °C) 


Coil - Strip, Foil: Inquire with Ulbrich Stainless Steel  Wire - Profile, Round, Flat, Square  

Mechanical Properties at Room Temperature 

Properties: Annealed Typical  

Ultimate Tensile Strength: 70 KSI min (438 MPa)  Elongation: 25% Min 

Properties: Tempered 

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

Additional Properties  

Corrosion Resistance  

Refer to NACE (National Association of Corrosion Engineers) for recommendations.  


Coil - Sheet, Strip, Foil: Inquire with Ulbrich Stainless Steel 

Standard Wire Finishes  

XC - Extra clean bright annealed or bright annealed and cold rolled Grease - Ultra-bright finish (for decorative applications) Soap - Soap is not removed from tempered wire to act as a lubricant.  

*Contact Ulbrich Wire with special finish requests.

Heat Treatment 

Alloy 302HQ is non hardenable by heat treatment. 


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 & 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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