Flow capacity of the capillary copper tube as its figure of merit

Influence of Recrystallization Annealing Modes on the Mechanical Properties of Copper Pipes After Large Plastic Deformation

“…It should be noted that the grain size in copper has its optimum value. For example, under reference documents, the optimal grain size for copper is 35 µm; at a lower value, plasticity decreases, and at a higher value, the surface finish of the product deteriorates due to inhomogeneous deformation of the grains, which reduces, for example, pipe capacity [9]. This explains why standard ASTM B68 limits grain size to 40 µm.…”