ASME SB171 C71500 Copper Nickel Tubesheet (CuNi 70/30)

ASME SB171 C71500 (70/30 Copper-Nickel) Plate is a high-strength, corrosion-resistant copper alloy composed of 70% copper and 30% nickel, with small amounts of iron and manganese for enhanced durability. It is widely used in marine, offshore, heat exchangers, desalination plants, and power generation applications due to its superior resistance to seawater corrosion and biofouling.

ASME SB171 C71500 is a specification for copper-alloy plate and sheet for pressure vessels, condensers, and heat exchangers. C71500 is a 70/30 copper-nickel alloy with high strength and excellent corrosion resistance in seawater.

A tubesheet is a perforated plate used to support and secure tubes inside a heat exchanger, ensuring proper alignment and sealing between the tubes and the surrounding structure. C71500 tubesheets are essential components in heat exchangers, boilers, and pressure vessels, providing a structural foundation for securing tube bundles that facilitate fluid heat transfer.

This specification establishes the requirements for copper-alloy plate, sheet, and circles cut from plate and sheet for pressure vessels, condensers, and heat exchangers.

Covered alloys include:

C36500 Leaded Muntz Metal

C44300 Admiralty, Arsenical

C44400 Admiralty, Antimonial

C44500 Admiralty, Phosphorized

C46400 Naval Brass, Uninhibited

C46500 Naval Brass, Arsenical

C61300 Aluminum Bronze

C61400 Aluminum Bronze D

C63000 10% Aluminum-Nickel Bronze

C63200 9% Aluminum-Nickel Bronze

C70600 90-10 Copper Nickel

C70620 90-10 Copper Nickel (modified for welding)

C71500 70-30 Copper Nickel

C71520 70-30 Copper Nickel (modified for welding)

Heat exchangers

Boilers

Pressure vessels

Marine and offshore platforms

Desalination plants

Power generation

Condensers

Q1: What is ASME SB171 C71500 tubesheet used for?

ASME SB171 C71500 tubesheet is used to support and secure tube bundles in heat exchangers, boilers, and pressure vessels. The tubesheet has drilled holes that hold the tubes in proper alignment and sealing. C71500 alloy is chosen for its high strength and superior resistance to seawater corrosion and biofouling in marine and offshore applications.

Q2: C71500 vs C70600 tubesheet – which one is stronger?

C71500 has higher strength than C70600 for tubesheet applications. C71500 contains 29-33% nickel while C70600 contains only 9-11% nickel. For high-pressure heat exchangers, power plants, and demanding marine environments, choose C71500 tubesheet. For less severe service, C70600 is more economical.

Q3: What is the chemical composition of C71500 tubesheet plate?

C71500 contains Cu balance, Ni 29-33%, Fe 0.40-1.0%, Mn ≤1.0%, Pb ≤0.05%, Zn ≤1.0%. The iron and manganese additions enhance durability and corrosion resistance in seawater. This composition meets ASME SB171 and ASTM B171 specifications.

Q4: What is the density of C71500 for tubesheet weight calculation?

C71500 density is 8.94 g/cm³. For tubesheet weight calculation: plate area × thickness × 8.94 = weight in grams. For imperial: density is 0.323 lb/in³. Accurate weight calculation is important for heat exchanger design and shipping.

Q5: What is the melting point of C71500?

Melting point range is 1170-1240°C (2140-2260°F). Thermal conductivity is 29 W/m·K. Electrical conductivity is 4-5% IACS. These properties affect the thermal performance of the tubesheet in heat exchanger applications.

Q6: What ASTM standard covers C71500 tubesheet plate?

ASTM B171 and ASME SB171 cover C71500 plate and sheet for pressure vessels, condensers, and heat exchangers. The specification establishes requirements for copper-alloy plate used in tubesheet manufacturing.

Q7: What other alloys are covered under ASTM B171 for tubesheet?

C36500, C44300, C44400, C44500, C46400, C46500, C61300, C61400, C63000, C63200, C70600, C70620, C71500, and C71520. These include admiralty brass, naval brass, aluminum bronze, and copper nickel alloys for various tubesheet applications.

Q8: Can C71500 tubesheet be used in desalination plants?

Yes, C71500 tubesheet is widely used in desalination plants. The page lists desalination plants as a key application. The alloy's superior resistance to seawater corrosion and biofouling makes it ideal for heat exchangers and condensers in desalination facilities.

Q9: What is the difference between C71500 and C71520 for tubesheet?

C71520 is a modified version of C71500 for welding applications. Both contain 70-30 copper nickel, but C71520 has tighter limits on impurities (Pb, Zn, P, S, C) to improve weldability. For tubesheets that require welding to tube ends, C71520 may be specified.

Q10: What is a tubesheet and why is C71500 used for it?

A tubesheet is a perforated plate that supports and secures tube bundles inside a heat exchanger. C71500 is used because it offers high strength, excellent corrosion resistance in seawater, and resistance to biofouling. The alloy's durability ensures long service life in marine, offshore, and power generation applications.

Chemical verification: Each plate tested for Ni 29-33%, Fe 0.40-1.0%, Mn ≤1.0%, Pb ≤0.05%, Zn ≤1.0%, Cu balance.

Mechanical testing: Tensile and hardness tested per ASME SB171 requirements.

Dimensional inspection: Plate thickness, flatness, and hole pattern checked against customer drawings.

Traceability: Test reports linked to heat numbers.

Plate packaging: C71500 tubesheet plates are packed in wooden crates with foam lining to prevent surface damage.

Surface protection: Plastic film or VCI paper applied to prevent corrosion during transit.

Labels: Alloy (C71500), heat number, dimensions, quantity, PO number, net/gross weight.

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