Abstract: An end closure for a container has a central panel, a circumferential countersink (18) formed around the center panel and adjacent the periphery of the end closure, and a fold (22) formed at the junction between the countersink and the center panel, the fold having opposite side walls which lie closely adjacent or in contact with each other and project upwards from the end closure. The fold may instead be formed at the base of the countersink. The fold forms an annular rigid zone in the end closure.

Abstract: This invention relates to a method of cooling hot rolled coiled bar in which the bar is water-cooled immediately after rolling to a temperature (t.sub.1 ') at which it is still sufficiently ductile to be readily coiled, in which it is then forced air cooled to a temperature (t.sub.1) not less than that at which transformation of the body of the bar from austenite begins, in which it is then free air cooled to a temperature (t.sub.2) not less than that at which scale transformation from wustite begins and in which the coiled bar is finally water-cooled to quench-in and suppress the transformation of the scale to magnetite.Typical temperature ranges for mild steel, low/high carbon steels (up to 1%C), low alloy steels and semi/free-cutting steels would bet.sub.1 ' 830.degree.C - 900.degree.C, t.sub.1 700.degree.C - 750.degree.C, t.sub.2 480.degree.C - 550.degree.C.