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SIGNS-SN34 2009 Through-Thickness Properties
Z-quality
BS EN 10164 Steel products with improved deformation
properties perpendicular to the surface of the product
– Technical delivery conditions defi nes three Z-quality
classes – Z15, Z25 and Z35. As a through-thickness
specimen cut from the steel product is stretched it
reduces in area by ductile “necking” before fracture. To
meet Z35 quality, three specimens must average at least
35% reduction in area in this test with no individual value
below 25%.
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