ASME SB111 C71500 Copper Nickle Alloy Seamless Tube For Refinery Heat Exchangers

ASTM B111 C71500 refers to a standard specification for copper-nickel (Cu-Ni) alloy seamless tubes, specifically made from C71500 alloy (70/30 copper-nickel). Here’s a detailed breakdown:

Key Features of ASTM B111 C71500 Seamless Tube:

1. Material Composition (C71500 Alloy):

(1) Chemical Composition (ASTM B111 C71500)

Notes:

The balance is primarily copper (~65-70%).

Iron (Fe) and manganese (Mn) enhance strength and corrosion resistance.

Low lead (Pb) ensures good weldability and fabrication.

(2) Mechanical Properties (ASTM B111 C71500 Seamless Tube)

Notes:

Annealed (O60): Softer, more ductile, used for forming/welding.

Drawn (H55, H80, etc.): Higher strength, used for pressure applications.

Typical Tempers:

H55: Half-hard

H80: Hard-drawn (higher strength, lower elongation).

(3) Other Key Properties

• Corrosion Resistance: Excellent in seawater, brackish water, and marine atmospheres
• Thermal Conductivity: ~29 W/m·K (lower than pure copper but good for heat exchangers).
• Electrical Conductivity: ~5% IACS (low, as expected for Cu-Ni alloys).

(4) ASTM B111 Testing Requirements

• Hydrostatic Test or Eddy Current Test (non-destructive)
• Flattening Test, Flaring Test, or Reverse Bend Test (for ductility verification).

2. Properties of ASTM B111 C71500 seamless tubes:

• Excellent corrosion resistance, especially in seawater and marine environments.
• Good erosion and biofouling resistance
• High thermal conductivity and ductility.
• Resistant to stress corrosion cracking.

3. Manufacturing Standard (ASTM B111):

• Covers seamless copper-nickel tubes for condensers, heat exchangers, and general engineering applications.
• Includes requirements for dimensions, mechanical properties, and testing (hydrostatic, eddy current, etc.).

4. Equivalent Standards:

UNS: C71500 (Unified Numbering System)

EN: CuNi30 (European Norm)

Other: DIN 2.0882, ISO CN 107

5. Why Choose C71500?

Superior to 90/10 Cu-Ni (C70600) in harsh saline conditions.

More cost-effective than titanium or super duplex stainless steels for many marine applications.

Applications of ASTM B111 C71500 (70/30 Copper-Nickel) Seamless Tubes:

ASTM B111 C71500 seamless tubes are widely used in industries requiring excellent corrosion resistance, high strength, and thermal conductivity, particularly in marine, power generation, and chemical processing environments.

1. Marine & Offshore Applications

Seawater Cooling & Condenser Systems (ships, offshore platforms)

Desalination Plants (heat exchanger and brine heater tubes)

Shipbuilding & Repair (piping systems, heat exchangers)

Ballast & Bilge Systems (resistant to biofouling and erosion)

Why C71500?
✔ Superior resistance to saltwater corrosion and biofouling compared to stainless steel.
✔ Good erosion resistance in high-flow seawater conditions.

2. Power Generation & HVAC

Power Plant Condensers (steam surface condensers, feedwater heaters)

Nuclear Plant Cooling Systems (compatible with high-purity water)

HVAC & Refrigeration Systems (heat exchangers, chiller tubes)

Why C71500?
✔ High thermal conductivity for efficient heat transfer.
✔ Resistant to ammonia, steam, and acidic condensates.

3. Oil & Gas Industry

Cooling Systems (refinery heat exchangers, condensers)

Offshore Platform Piping (seawater injection, firewater systems)

LNG & Petrochemical Processing (corrosion-resistant tubing)

Why C71500?
✔ Handles sour gas (H₂S) environments better than carbon steel.
✔ Resistant to stress corrosion cracking (SCC).

4. Chemical & Process Industries

Chemical Processing Equipment (acid and alkali-resistant tubing)

Pharmaceutical & Food Processing (non-toxic, FDA-compliant)

Distillation & Evaporation Systems

Why C71500?
✔ Excellent resistance to organic acids, alkalis, and saline solutions.
✔ Low corrosion rates in harsh chemical environments.

5. Industrial & General Engineering

Heat Exchangers & Boilers

Hydraulic & Instrumentation Tubing

Water Treatment Plants (cooling loops, brine handling)