Printer friendly version of 22.07.2019

Technical comparison

The most important technical properties for components used in electrical engineering are:

  • Electrical conductivity (which is proportional to the thermal conductivity)
  • Yield strength Rp0.2 while still allowing a sharp-edged 90° bend
  • Resistance to relaxation


The graph plots the most important materials for spring components used in electrical engineering, showing their electrical conductivity and a yield strength range Rp0.2 of approx. 80 MPa. This range is selected so that sharp-edged 90° bends in the direction indicated are still possible with a full specimen width and a strip thickness of at most 0.5 mm. Even higher bending requirements, such as for example those imposed by folding or by a thicker strip, require a reduction in the yield strength. Higher values (yield strengths) are possible if the bending radii are increased.

Those alloys which have a particularly good resistance to relaxation (up to 3000 h at 150°C) are denoted by *, and those with an unsatisfactory resistance to relaxation (below 100°C) are marked by -.

Large view Good way bending, max. strip thickness 0.5 mm
Large view bad way bending max. strip thickness 0.5 mm

Current metal prices

Officials (Prompt) 07/19/2019
Cu (Settlement) 6,066.00 in USD/t
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