The change in hardness by low-temperature annealing of cold-rolled 70/30 brasses, having different ready to-finish grain sizes (fine and coarse) and being cold-rolled by different reductions (10∼90%)was measured. The specimens were annealed at the temperatures of 150,250,350 and 450° for 5 min-24 hrs each. The hardness change by annealing is considered to be related to the structures as ready-to-finish annealed and as cold-rolled. It appears that the hardness does not vary simply with rolling reduction or grain size, but is more complicatedly influenced by the development degree of the rolling structure or by the condition of specimens such as their composition.
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