What Is C70600
C70600, designated B10 or Cu90Ni10, is a high-performance copper-nickel alloy with copper and nickel as the main components. It has excellent corrosion resistance, good mechanical properties, and processing performance, and is widely used in marine engineering, chemical equipment, and other fields.
Chemical Composition
For BFe10-1-1, the composition is copper as remainder, nickel plus cobalt 9.0 to 11.0 percent, iron 1.0 to 1.5 percent, manganese 0.5 to 1.0 percent, lead 0.02 percent maximum, phosphorus 0.006 percent, sulfur 0.01 percent, carbon 0.05 percent, silicon 0.15 percent, zinc 0.3 percent, tin 0.03 percent, and impurities 0.7 percent. For C70600 the limits are nickel 9.0 to 11.0 percent, iron 1.0 to 1.8 percent, manganese 1.0 percent maximum, zinc 1.0 percent, and lead 0.05 percent.
Mechanical Properties
In the annealed condition, M, the tensile strength is at least 290 MPa with elongation of 30 percent and hardness 75 to 110 HV or 70 to 105 HB. In the half-hard condition, Y2, the tensile strength is at least 310 MPa with elongation of 12 percent, and in the hard condition, Y, at least 480 MPa with elongation of 8 percent.
Key Properties
C70600 forms a thin, adherent, protective surface oxide film stable in seawater, a complex mixture of copper oxide and nickel and iron oxides that heals itself if damaged. It has excellent resistance to chloride stress corrosion cracking, retains toughness at cryogenic temperatures, and has a recommended maximum continuous service temperature of about 400 degrees C.
Applications
C70600 is used in power plant heat exchangers, desalination systems, petrochemical facilities, and marine engineering. Tube forms include drawn pipes, condenser and heat transfer pipes, and extruded pipes, in sizes from 10 to 368 mm outer diameter with wall thicknesses from 1 to 10 mm.
Frequently Asked Questions
Q: What is B10?
A: The Chinese designation BFe10-1-1 for C70600 90/10 copper-nickel.
Q: What is the tensile strength annealed?
A: At least 290 MPa with 30 percent elongation.
Q: Why is C70600 resistant to seawater?
A: A protective self-healing oxide film forms on the surface.
Q: What is the maximum service temperature?
A: About 400 degrees C.
Q: What applications use C70600?
A: Heat exchangers, desalination, petrochemical, and marine systems.
Q: Can C70600 withstand freezing temperatures?
A: Yes, it retains toughness at cryogenic temperatures.
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