Synthetic studies on stainless clad steels

Stainless clad steels are used widely as the economical material with excellent corrosion resistance in chemical industry, atomic power industry and others. At present, stainless clad steels are made by rolling, explosion joining and build-up welding, and their properties and applicability must be recognized sufficiently to compare and select them. Accordingly, various tests were carried out on the clad steels made by the methods described above, and SUS 316 L austenitic stainless clad steel and SUS 405 ferritic stainless clad steel were used. The parent material was SB 42 steel. The mechanical properties of respective clad steels at normal and high temperatures were good, and the difference according to the manufacturing methods was not observed. The mode of joint interfaces and the state of carbide precipitation were somewhat different. The interface of the explosion-joined SUS 316 L clad steel was hardened, but in the other clad steels subjected to thermal history, hardened part was not observed. The fatigue strength of respective clad steels was slightly different, but higher than that of SB 42. The distribution of residual stress on the surface and in the internal part of the clad steels was different according to the kinds of steels and the manufacturing methods, but the stress on the surface was below 20 kg/mm2. (Kako, I.)