C71500 CuNi 70/30: Seawater Corrosion-Resistant Copper-Nickel for Marine
ASTM B111 / B466 · Published: 2026-06-02 · Updated: 2026-06-02
C71500 (CuNi 70/30) is the standard seawater piping material for naval vessels. Biofilm-induced corrosion resistance improves with seawater exposure. Corrosion rate
C71500 (CuNi 70/30) is the standard seawater piping material for naval vessels. Biofilm-induced corrosion resistance improves with seawater exposure. Corrosion rate <0.025 mm/year at 4.5 m/s flow. For seawater cooling systems, firewater piping, offshore platform sheathing.
Quick Facts
| Category | Copper Alloy |
| Standard | ASTM B111 / B466 |
| Density | 8940 kg/m³ |
| Yield Strength | 140 MPa (annealed) |
| Tensile Strength | 380 MPa |
Global Equivalents & Cross-Reference
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Frequently Asked Questions
70/30 vs 90/10?
70/30: higher flow velocity (4.5 vs 3.5 m/s), better sulfide pitting resistance. 90/10: ~15% cheaper, adequate for commercial shipping.
References & International Standards
- ASTM International. Standard Specifications for Steel & Metal Alloys. astm.org
- International Organization for Standardization (ISO). Metallic Materials — Cross-Reference Database. iso.org
- American Iron and Steel Institute (AISI). Steel Grade Designations & Equivalents. steel.org
- European Committee for Standardization (CEN). EN Steel Standards & Numbering System. cencenelec.eu