Abstract
In order to prevent orange-peel appearing in a surface of stainless clad steel, the effects of various processing parameters on ferrite grain size have been investigated on a low carbon-niobium-titanium steel which is suited for a base material to be clad with stainless steel. Based on the results obtained, three kinds of processes have been proposed, among which the following two have been selected from practical stand point.
(1) The steel containing 0.05% niobium is annealed at temperature higher than 1 000°C and cooled with a rate of 2540°C/s.
(2) The steel is annealed within the temperature of ferrite range.
In the former case, the annealing at higher temperature than the conventional can be applied resulting in better ductility of the surface stainless layer.
In the latter case, the steel will be low cost and has good drawability for the small amount of alloying elements, and has great benifit that the steel is available more easily because of mass production as a popular high drawable steel. The proposed processes have successfully been applied to produce the clad steel sheets of laboratory scale and mill production scale, respectively.
