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

Applications

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

Description

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)

Forms

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.

Finishes

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.

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 & 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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