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The use of automotive parts made from thin high-strength steel sheets has become prevalent due to achieving high collision safety and significant weight reduction of automobiles. Since boron-added steel exhibits good hardenability, it has been widely used for hot stamping.1) Direct hot stamping of boron steel sheets is characterized by simultaneous quenching and stamping, producing high-strength 1 500 MPa grade steel parts with good shape accuracy. Automotive steel parts require good surface quality for proper spot welding and paint adhesion. For uncoated boron steel sheets, heating in air or combustion gas before quenching produces iron oxide scale on their surface. Hence, descaling by shot blasting or other means is generally needed after hot stamping to achieve good surface quality. To shorten the descaling procedure, pre-coating solutions such as aluminized2) and galvannealed (GA)3) boron steels were developed, becoming widely used for automotive parts. This technology has Liquid Metal Embrittlement of Hot Stamped Galvannealed Boron Steel Sheet – Effect of Heating Time on Crack Formation –