High-Conductivity Chromium Zirconium Copper Square Bars – C18150

Short Description:

Product Specifications
Name： Chromium Zirconium Copper Square Bar
Standard： ASTM B768 / C18150, RWMA Class 2, RoHS Compliant, REACH Compliant
Material： C18150 (CuCrZr, Chromium 0.5-1.5%, Zirconium 0.03-0.3%)
Surface： Mill Finish, Optional Turned or Ground
Side Length： 10mm – 200mm
Length： 500mm – 3000mm (custom cut-to-length available)
Product Features: Excellent electrical and thermal conductivity · Superior strength retention at high temperatures · Outstanding resistance to softening and wear · Good fatigue and arc erosion resistance · High hardness with maintained ductility · Consistent properties after prolonged heat exposure · Easy machining and forming
Application Field: Resistance welding electrodes and shafts, Injection mold cores and inserts, High-current electrical contacts, Heat sinks and cooling blocks, Spot welding tips and dies, Plunger tips for die casting, Electrical connectors in harsh environments, Aerospace components, Automotive welding fixtures

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Chromium Zirconium Copper Square Bar – Process & Quality Assurance Statement
Our chromium zirconium copper square bars are engineered to maintain exceptional conductivity and mechanical integrity under elevated temperatures and cyclic loading, making them a preferred material for precision welding and molding tools.

Key process features

Manufacturing involves careful alloying and heat treatment to fully develop the precipitation strengthening effects:
●Melting & Alloying: Pure copper is alloyed with precise chromium and zirconium under controlled conditions to ensure homogeneous distribution.
●Hot Extrusion or Rolling: The billet is hot worked into square sections, refining the cast structure and achieving initial density.
●Solution Annealing: Bars are heated to dissolve alloy elements, then quenched to create a supersaturated matrix.
●Precipitation Aging: Controlled low-temperature aging precipitates fine particles for optimal hardness and conductivity.
●Straightening & Finishing: Bars are straightened and surfaces turned or ground to exact dimensions.
●Final Cleaning: Thorough cleaning removes any residue, ensuring clean, ready-to-use material.
●Protective Packaging: Bars are bundled and wrapped to prevent surface damage during global transport.

Quality control system

● Full traceability from raw copper charge to finished square bar
● Detailed material and treatment reports included with every delivery
● Sample retention ≥3 years for independent analysis (SGS, BV, TÜV, etc.)
● 100% inspection of essential attributes:
• Chemical composition (optical emission spectrometry)
• Mechanical properties (tensile, hardness, and conductivity on sample sections)
• Dimensional accuracy (micrometers and CMM; typical tolerance ±0.2mm on side)
• Surface finish and straightness (profilometer + laser checks)
• Conductivity testing (typically ≥80% IACS post-aging)
● Internal standards exceed ASTM B768 requirements. Typical C18150 aged properties: Tensile strength ≥450 MPa, Hardness ≥140 HB, Electrical conductivity ≥80% IACS, Excellent stability up to 500°C without significant softening.
● ISO 9001:2015 certified facility ensures every chromium zirconium copper square bar provides the reliable combination of conductivity, strength, and durability your precision applications demand.