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The Japanese production of four-wheel vehicles peaked with some 11.7 million units in 1981. About 50 % of these automobiles were exported abroad, chiefly to cold regions like North America and Europe. In 1981, Japan's automotive industry consumed 10 671 000 tons of plain carbon steel, and uncoated and coated steel sheets accounted for 62 % and 12 % of this consumption, respectively, as shown in Table 1. For automobiles in general and passenger cars in particular, four prime social needs have been highlighted : (1) alleviation of exhaust gas pollution, (2) assurance of passenger safety, (3) fuel economy and (4) improvement of automobile durability. From a point of view of steel, the need (1) calls for exhaust system material that can withstand corrosion at high temperatures. The needs (2) and (3) can be filled by the strength enhancement and weight reduction of automobile bodies, which in turn necessitates the use of higher-strength and lighter-gage hot-rolled sheets for wheels and other components, and cold-rolled and precoated sheets for bodies. To conserve oil resources, alcohol and other alternative fuels have appeared and created an exacting demand for new fuel tank material. For the need (4), automobile body corrosion is the largest problem and attack by deicing salt spread on the highways of North America and Europe in winter is the severest. In this field, it is necessary to improve the phosphatability of sheets and to coat sheets with more adequate protective material. Of the automotive steels mentioned above, this report takes up precoated sheet steels, classifies them into automobile body corrosion-resistant steel, fuel tank steel and heat-resistant steel according to application, and discusses their developmental background, present status and future problems. There also are available prepainted steel sheets for inner panels, another category of precoated steel, vibration-damping

Progress of automotive precoated sheet steels.