Heavy-Duty CuCrZr Alloy Thick Rods

Large Chromium Zirconium Copper Round Bar – Process & Quality Assurance Statement

Our large chromium zirconium copper round bars are specifically developed for heavy-duty applications requiring sustained conductivity and mechanical strength at elevated temperatures, where standard copper would soften or lose performance.

Key process features

Production employs advanced metallurgical and extrusion techniques to maintain uniform properties in substantial diameters:

●Alloy Preparation: High-purity copper is alloyed with precise chromium and zirconium additions in controlled induction furnaces.
●Casting: Semi-continuous casting produces large ingots with homogeneous composition and minimal segregation.
●Hot Extrusion: High-tonnage presses extrude the material into round bars, refining grain structure and achieving high density.
●Solution Heat Treatment: Bars are solution annealed at high temperature and rapidly quenched to create a supersaturated matrix.
●Cold Working & Aging: Controlled drawing followed by precipitation aging develops optimal hardness, strength, and conductivity balance.
●Finishing: Precision straightening, turning, and cutting ensure excellent straightness and tight dimensional tolerances.
●Surface Protection: Final cleaning and light oiling prevent oxidation during storage and global shipping.

Quality control system

● Full traceability from raw alloy melt to finished round bar
● Comprehensive material test certificates and heat treatment reports supplied with every shipment
● Sample retention ≥3 years for third-party verification (SGS, BV, TÜV, etc.)
● 100% inspection of critical parameters:
• Chemical composition (optical emission spectrometry)
• Mechanical properties (tensile, hardness, and conductivity tested at multiple locations)
• Dimensional accuracy (micrometers and ultrasonic gauges; typical tolerance ±1% on diameter)
• Surface quality and straightness (visual + laser measurement)
• Internal soundness (full ultrasonic scanning)
● 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 large chromium zirconium copper round bar delivers consistent, reliable performance in your most demanding high-temperature and high-conductivity applications.

●Cold Working & Aging: Controlled drawing followed by precipitation aging develops optimal hardness, strength, and conductivity balance.
●Finishing: Precision straightening, turning, and cutting ensure excellent straightness and tight dimensional tolerances.
●Surface Protection: Final cleaning and light oiling prevent oxidation during storage and global shipping.