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See Chinese contents: GB/T 5028-2008 GB/T 5028-2008: Metallic materials -- Sheet and strip -- Determination of tensile strain hardening exponent
This document specifies the method to determine the tensile strain hardening exponent (n value) of metal sheets and strips. This method is only applicable to the part where the stress-strain curve is monotonically rising continuously within the plastic deformation range (see 7.4).
