Abstract: A heat treatment pot for holding molten salts is produced by a spinning process to form the body of the pot from a substantially circular disc blank of heat resisting nickel chromium alloy. In the spinning process, a mandrel is utilized which has a circular end face and an external shape and cross-sectional dimensions complementary to the internal shape and dimensions of said body. The initial diameter of the blank is greater than the diameter of the circular end face of the mandrel by an amount which exceeds at least 90% of the required depth of said body. The blank is applied against the mandrel end face and the spinning process is carried out only to an extent sufficient to bend the blank so as to conform to the shape of the mandrel and to extend the blank along the length of said mandrel for a distance substantially equal to said depth of the body of the pot. The disc blank may be of laminate metal sheet comprising a layer of the nickel chromium alloy clad with a layer of mild steel.