Our UNS C71500 copper-nickel 70/30 seamless tubes are engineered for heat exchanger service and meet ASTM B111 and ASME B111. Offered OD options are 16 mm and 25.4 mm with 1.25 mm wall thickness. Each tube is fabricated at 1882 mm per piece; order lots are customizable to client project needs. Export wooden case packaging safeguards against damage during ocean transport. EN10204-3.1 or 3.2 material test certificates are available. Third-party inspection can be scheduled before shipment, delivering reliable seawater corrosion resistance for marine thermal transfer equipment worldwide.