Copper Nickel C715 - C71500

C71500 copper nickel (also known as C715 or 70/30 copper nickel) is a copper-nickel alloy comprised of 30% nickel with a small iron content up to 0.5%. This copper nickel 70/30 is known for its moderate strength, workability, formability and weldability.

This c71500 material finds its greatest application in areas of high temperatures and pressures combined with high velocity and destructive turbulence, making it very suitable and ideal for marine or industrial industries.

c71500 mechanical properties vary by product form and temper:

Design guidance for buyers: Use OS035 annealed tube for bending and tube expansion; use OS025 light annealed tube for higher strength requirements. H02 half hard rod is suitable for machined components like valve stems and pump shafts.

c71500 density = 0.323 lb/in³ at 68°F (8.94 g/cm³).

Fabrication Suitability

C71500 copper pipe and other forms are used in:

Why C71500 for these applications: The alloy's ability to withstand high temperatures, high pressure, high velocity, and destructive turbulence makes it the preferred choice.

Q1: What is the difference between C71500 and C70600 copper nickel?

C71500 (70/30) has higher strength and better erosion resistance than C70600 (90/10). C71500 contains 30% nickel vs 10% in C70600. Based on the mechanical data, C71500 H02 rod has 75 ksi tensile strength vs C70600 typically 55-65 ksi. C71500 is recommended for high velocity and destructive turbulence conditions, while C70600 is suited for lower velocity service. However, C71500 is more expensive – typically 25-30% higher cost.

Q2: What ASTM standards cover C71500 seamless pipe and tube?

ASTM B111 covers seamless condenser tube, and ASTM B466 covers seamless pipe. For ASME code applications, use ASME SB111 for tube and ASME SB466 for pipe. Military applications require MIL-T-16420K. Other applicable standards include ASTM B151 (rod/bar), ASTM B171 (plate/condenser tube sheets), and ASTM B122 (sheet/plate/strip).

Q3: What is the density of C71500 material in lb/in³?

Density is 0.323 lb/in³ at 68°F (8.94 g/cm³). Use this for weight calculations. For a 1" OD × 0.065" wall C71500 copper pipe, weight is approximately 0.65 lb per foot. For plate, weight per square foot for 1" thick plate = 0.323 lb/in³ × 144 in² = 46.5 lb/sq ft.

Q4: What is the machinability rating of 70/30 copper nickel?

Machinability rating is 20 (free-machining brass = 100). This means C71500 is relatively difficult to machine. For bar stock, H02 temper (half hard) machines better than annealed. Use sharp carbide tooling, lower cutting speeds, and abundant coolant. For complex components like valve bodies, consider purchasing finished machined parts from the supplier.

Q5: What welding processes are suitable for C71500 copper pipe?

Gas shielded arc welding (TIG/MIG), coated metal arc welding (MMA), butt welding, seam welding, and spot welding are all excellent. Oxyacetylene welding is good. Brazing and soldering are also excellent. For seawater service, TIG welding with appropriate filler metal (ERNi-7) is recommended. Avoid overheating as it can reduce corrosion resistance.

Q6: What is the thermal conductivity of 70/30 copper nickel?

Thermal conductivity is 17 Btu·ft/(sq ft·ft·hr·°F) at 68°F. This is approximately 1/12 that of pure copper (C12200 at ~223 Btu). For heat exchanger applications, this lower conductivity requires more surface area compared to pure copper. However, the alloy's superior seawater corrosion resistance and ability to withstand high velocity make it the preferred choice for marine condensers.

Q7: What is the yield strength of C71500 annealed tube?

For OS035 annealed tube, tensile strength is 54 ksi minimum, but yield strength is not specified – elongation is 45%. For OS025 light annealed tube, yield strength is 25 ksi with tensile strength 60 ksi. For plate/sheet/strip in M20 temper, yield strength is 20 ksi with tensile strength 55 ksi and elongation 45%.

Q8: What are the available shapes and sizes for C71500?

Available shapes include round bar (1/2" to 10-1/8" dia), plate (3/16" to 2-5/8" thick), sheet/strip (0.065", 0.125"), tube (3/8" to 1" OD), pipe (1/4" to 12" standard/sch 40 and 1/4" to 4" extra heavy/sch 80), fittings (threaded and socketweld 3000#/6000#), and flanges (slip-on, threaded, blind, weldneck). Custom cutting available via plate saws, bar saws, shears, and water jets.

Q9: What are the equivalent European standards for C71500?

EN CW352H is the European standard for C71500 (some sources show CW354H – confirm with supplier). DIN 2.0872 is the German standard. BS 2871 CN102 is the British standard. For European projects, specify EN CW352H and request dual certification (ASTM + EN) if needed.

Q10: Can C71500 withstand high velocity and destructive turbulence?

Yes, C71500 is specifically designed for high velocity and destructive turbulence conditions. The alloy's small iron content (0.4-1.0%) gives it extraordinary resistance to erosion and impingement attack. This makes C71500 the preferred choice for condenser tubes, seawater piping, and heat exchanger components where flow velocities are high and turbulence is unavoidable.

Marking per bundle:

Alloy: C71500 (70/30 Copper Nickel)

Heat number

Size: OD × wall thickness

Length and quantity

Purchase order number

Net weight and gross weight

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