determines corrosion properties and dimensional accuracy and is a factor in the mechanical properties

The Cu content is expressed by:

•

Increasing tensile strength by 20 to 30% with 0 to 3% Cu, i.e. from 300 to 380 N/mm

•

Increased hardness with the same values, i.e. from ca. 90 to ca. 120 HB

•

A lower increase in elongation, fracture strain between 5 and 10%

•

Greater accuracy with lower Cu content, as with increasing Cu greater shrinkage of up to 20 x 10ˆ4

•

High dimensional accuracy through tempering to anticipate shrinkage with lower residual shrinkage of only 4 x 10-4, almost independent of Cu content.

•

Corrosion properties achieved in particularly strict autoclave tests become even better with a content off 0.7% Cu and upwards