STEEL SHEET FOR HOT PRESS FORMING, METHOD OF PRODUCING STEEL SHEET FOR HOT PRESS FORMING, HOT PRESSED MEMBER, AND METHOD OF PRODUCING HOT PRESSED MEMBER
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United States of America
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Issued Date -
Apr 3, 2025
app pub date -
Nov 17, 2022
filing date -
Nov 17, 2022
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Abstract
A steel sheet for hot press forming that can reduce diffusible hydrogen content introduced in hot press forming without controlling the atmosphere dew point, and may be used to obtain a hot pressed member that has excellent post-coating corrosion resistance. The steel sheet includes a base steel sheet and a coated layer on both sides of the base steel sheet. The coated layer has a chemical composition containing Si: 7 mass % to 11 mass %, Mg: 0.6 mass % to 1.9 mass %, one or both of Ca and Sr: in total, 1.0% to 10% of Mg, and Fe: 0 mass % to 30 mass %, with the balance being Al and inevitable impurity. Concentration of Mg solute in Al phase in the coated layer is less than 1 mass %, and average thickness of the coated layer is 10 μm to 30 μm on each side of the base steel sheet.
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