ASTM B111 C71500 Cu-Ni 70/30 Low Finned Tube For Marine And Offshore Systems Bare Tube OD 10-38mm
ASTM B111 C71500 (Cu-Ni 70/30) Low Finned Tube For Marin and Offshore Systems
ASTM B111 C71500 Low Finned Tube is a high-performance copper-nickel (Cu-Ni) alloy heat exchanger tube designed for enhanced corrosion resistance and heat transfer efficiency in demanding environments. Here’s a detailed breakdown:
1. Material ASTM B111 C71500:
(1) Chemical Composition (ASTM B111 C71500)
| Element | Composition (% Weight) | Key Role |
| Copper (Cu) | 65.0–70.0% | Base metal, provides ductility and thermal conductivity. |
| Nickel (Ni) | 29.0–33.0% | Enhances corrosion resistance and strength. |
| Iron (Fe) | 0.40–1.0% | Improves resistance to seawater erosion and impingement attack. |
| Manganese (Mn) | 0.50–1.5% | Deoxidizer, improves weldability and hot workability. |
| Zinc (Zn) | ≤ 1.0% | Trace element, minimal impact. |
| Lead (Pb) | ≤ 0.05% | Impurity control (avoid embrittlement). |
Notes:
C71500 = 70/30 Cu-Ni: Superior to 90/10 Cu-Ni (C70600) in corrosive environments.
Low impurities ensure stability in marine/chemical applications.
(2) Mechanical Properties (ASTM B111 C71500)
| Property | Value | Remarks |
| Tensile Strength (min) | 380 MPa (55,000 psi) | High strength for pressure applications. |
| Yield Strength (0.2% offset, min) | 125 MPa (18,000 psi) | Suitable for structural loads. |
| Elongation (min, in 50mm) | 30% | Excellent ductility for forming/expansion. |
| Hardness (Rockwell B) | ~65 HRB | Balanced machinability and wear resistance. |
| Thermal Conductivity | ~29 W/m·K | Lower than pure copper but stable under thermal cycling. |
| Electrical Conductivity | ~5% IACS | Not typically used for electrical applications. |
Additional Properties:
Corrosion Resistance: Exceptional in seawater, brackish water, and acidic/alkaline fluids.
Biofouling Resistance: Inhibits marine organism growth.
Temperature Range: -196°C to +260°C (cryogenic to moderate high-temp use).
Comparison with Common Alternatives
| Alloy | Composition | Tensile Strength | Corrosion Resistance | Typical Use |
| C71500 | 70Cu-30Ni | 380 MPa | ★★★★★ (Seawater) | Marine, LNG, Oil & Gas |
| C70600 | 90Cu-10Ni | 290 MPa | ★★★★☆ | Moderate salinity |
| C12200 | DHP Copper | 220 MPa | ★★★☆☆ (Freshwater) | HVAC, Power Plants |
2. Low Finned Tube Design
Fins: Integral, externally machined fins (typically 0.8–1.5 mm height) to increase surface area.
Purpose: Optimizes heat transfer in compact spaces while resisting fouling and corrosion.
3.The key features of ASTM B111 C71500 (Cu-Ni 70/30) Low Finned Tubes1. Superior Corrosion Resistance:
- Superior Corrosion Resistance
- Enhanced Heat Transfer Efficiency
- Mechanical Strength & Durability
- Biofouling & Erosion Resistance
ASTM B111 C71500 (Cu-Ni 70/30) Low Finned Tubes are engineered for extreme environments where corrosion resistance, biofouling prevention, and thermal efficiency are critical. Their 70/30 copper-nickel composition and finned design make them ideal for:
1. Marine & Offshore Systems
- Seawater Coolers/Condensers: Resists saltwater corrosion, erosion, and biofouling in ships, submarines, and offshore oil rigs.
- Desalination Plants: Used in multi-stage flash (MSF) and reverse osmosis (RO) evaporators due to tolerance for high-salinity brine.
2. Oil & Gas Industry
- LNG Heat Exchangers: Withstands cryogenic temperatures in liquefied natural gas processing.
- Refinery Coolers: Handles sour gas (H₂S) and acidic fluids in crude oil refining.
3. Power Generation
- Nuclear Plant Condensers: Resists corrosion in brackish or contaminated cooling water.
- Coastal Power Stations: Preferred over carbon steel in saltwater-cooled condensers.
4. Chemical Processing
- Acid/Alkali Heat Exchangers: Suitable for dilute sulfuric, hydrochloric, and caustic solutions (avoid oxidizing acids like nitric acid).
- Petrochemical Coolers: Used in ethylene and ammonia production systems.
5. Industrial HVAC & Renewable Energy
- Coastal HVAC Systems: Air-cooled condensers in corrosive seaside environments.
- Geothermal Plants: Resists mineral-laden geothermal brine.
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