CompaniesChinese export restrictions mean more expensive tools for JapanTungsten materials are used by Mitsubishi Materials to make cemented carbide cutting tools. (Mitsubishi Materials)ARATA SHIGENOApril 29, 2026 06:10 JSTTOKYO -- Japan's Mitsubishi Materials will more than triple prices on tungsten products used in hardened cutting tools in some cases, as Chinese export restrictions continue to limit the supply of the rare metal.