Arcelormittal

Gianni Boi

Emmanuel Lucas

Thierry Sturel

Blandine Remy

A press hardened coated steel part with high resistance to delayed fracture, the coating containing (Fe&#x2014;Al) intermetallic compounds resulting from the diffusion of iron into an aluminum or an aluminum-based alloy, or an aluminum alloy of a precoating, wherein the chemical composition of the steel includes, in weight: 0.16%&#x2264;C&#x2264;0.42%, 0.1%&#x2264;Mn&#x2264;3%, 0.07%&#x2264;Si&#x2264;1.60%, 0.002%&#x2264;Al&#x2264;0.070%, 0.02%&#x2264;Cr&#x2264;1.0%, 0.0005&#x2264;B&#x2264;0.005%, 0.002%&#x2264;Mg&#x2264;0.007%, 0.002%&#x2264;Ti&#x2264;0.11%, 0.0008%&#x2264;O&#x2264;0.005%, wherein (Ti)&#xd7;(O)&#xd7;10&#x2264;2, 0.001%&#x2264;N&#x2264;0.007%, 0.001%&#x2264;S&#x2264;0.005%, 0.001%&#x2264;P&#x2264;0.025% and optionally one or more elements selected from the list of: 0.005%&#x2264;Ni&#x2264;0.23%, 0.005%&#x2264;Nb&#x2264;0.060%, the remainder being Fe and unavoidable impurities, and wherein the microstructure includes at least 95% martensite.

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Rombas, France

Gianni Boi