TOKYO — Just two suppliers produced roughly half of the 10 million crankshaft forgings used by Japan’s auto industry last year. According to a survey by WEVTU, Sumitomo Metal Industries Ltd. produced an estimated 3 million forgings. Second ranked Aichi Steel Corp., main supplier to Toyota Motor Corp., produced around 1.8 million. Aichi Steel, a Toyota affiliated supplier, makes forgings at its Tokai complex in Aichi Prefecture; Sumitomo Metals makes them at its Osaka Steel Works. In ...

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