When ordering Cu-Ni tubes per EEMUA 234, the following should be specified:

• Alloy designation (e.g., 90/10 Cu-Ni, 70/30 Cu-Ni)
• Dimensions (outer diameter, wall thickness, length)
• Temper (e.g., annealed, as-drawn)
• End finishes (plain, beveled, grooved)
• Certification requirements (e.g., EN 10204 3.1/3.2)
• Special testing (if required, e.g., corrosion testing)

Common alloys covered:

• 90/10 Cu-Ni (UNS C70600) – General seawater service
• 70/30 Cu-Ni (UNS C71500) – Higher corrosion resistance
• Other variants (if applicable, with trace element controls)

• Melting process: Typically electric furnace with controlled impurity levels.
• Chemical composition: Limits for Cu, Ni, Fe, Mn, and trace elements to ensure corrosion resistance.

• Tensile strength, yield strength, elongation per alloy and temper.
• Hardness requirements (Rockwell or Vickers, as applicable).

• Outside diameter, wall thickness, straightness, and length tolerances specified.
• Surface finish requirements (e.g., smooth, free from defects).

• Non-destructive testing (NDT): Eddy current, ultrasonic, or hydrostatic testing.
• Corrosion testing (if specified, e.g., ASTM G48 for pitting resistance).
• Visual inspection for surface defects.
• Certification: Mill test reports (MTRs) to EN 10204 3.1 or 3.2.

• Permanent marking with alloy grade, heat number, size, and manufacturer.
• Protective packaging to prevent damage during transport.

• Compliance with ASTM, EN, or other international standards as applicable.
• Third-party inspection (if required by purchaser).

Additional Referenced Standards:

• ASTM B466 / B467 (Seamless & Welded Cu-Ni Tubes)
• ISO 13388 (Copper & Copper Alloys – Inspection & Testing)
• EN 12451 (Copper & Cu Alloy Tubes for Heat Exchangers)

Material Condition (Temper):

• Annealed (O) – Soft condition for forming
• As-Drawn (H) – Hard temper for higher strength

Traceability & Certification:

• Heat numbers must be provided for material traceability.
• Certification per EN 10204 3.1 or 3.2 (Inspection Certificates).