Which one of the following is not a discontinuity common to rolled products?

Cold shuts are not typically considered a discontinuity common to rolled products. In the context of rolled products, seams, laminations, and cracks are well-known discontinuities that can occur due to the manufacturing processes involved in rolling metals.

Seams result from imperfections during the welding process or from the original ingot's structure and are characteristics that can compromise the integrity of the rolled product. Laminations refer to thin layers or deposits of non-metallic material within the metal, often stemming from the processes used during rolling and can lead to weakening. Cracks can arise from thermal or mechanical stresses during processing, affecting the durability and performance of the rolled product.

In contrast, cold shuts are more commonly associated with casting processes rather than rolling. A cold shut occurs when two streams of molten metal fail to fuse properly during casting, forming a discontinuity. Since this defect is linked with casting techniques, it does not classify as a typical discontinuity found in rolled metal products.