Nickel 270 is a high-purity wrought nickel alloy containing a minimum of 99.97 percent nickel. It is the purest commercially available nickel grade, with extremely low levels of residual elements (carbon, sulfur, iron, manganese, silicon, and others). This exceptional purity provides unique properties, including low vapor pressure, good corrosion resistance, and consistent electrical and thermal performance.

The nominal chemical composition is: nickel 99.97 percent minimum, carbon up to 0.01 percent, sulfur up to 0.001 percent, iron up to 0.005 percent, manganese up to 0.001 percent, silicon up to 0.001 percent, and copper up to 0.005 percent.

Key mechanical properties (typical, annealed condition):

● Tensile strength: 300–450 MPa

● Yield strength (0.2% offset): 70–170 MPa

● Elongation: 40–55 percent

● Density: 8.89 g/cm³

Nickel 270 offers excellent resistance to caustic alkalis and many reducing environments, similar to Nickel 200, but with significantly lower outgassing and vapor pressure due to its high purity. It is non-magnetic in the annealed condition (slightly magnetic after cold work). The alloy maintains good ductility and fabricability, though its softness requires care in machining.

Common standards: ASTM B162 (plate, sheet, strip), B160 (rod, bar, wire), ASTM F239 (for electronic applications). Often supplied to proprietary specifications for critical applications.

Typical applications include:

● Electronics: critical components in semiconductor manufacturing, such as sputtering targets, lead frames, and electrical contacts.

● Aerospace and defense: components requiring extremely low vapor pressure and high purity, e.g., in guidance systems and vacuum chambers.

● Chemical processing: equipment for high-purity chemical handling where contamination must be avoided.

● Research and instrumentation: vacuum components and precision parts.

Comparison with Nickel 200 and 201: Nickel 270 has significantly higher purity (99.97% vs 99.6% min), resulting in lower hardness, lower mechanical strength, and much lower trace element content. It is more expensive and intended for specialized applications where purity is critical. For general caustic and corrosion service, Nickel 200 is more economical. For high-temperature service, Nickel 201 is preferred.

Selection guidance: Choose Nickel 270 for ultra-high-purity applications requiring minimal outgassing, low vapor pressure, and freedom from trace contaminants, such as semiconductor and vacuum systems. For standard corrosion-resistant components, use Nickel 200 or 201.