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Abstract

The invention relates to a hot-formed steel part having a composition consisting of 0.22%≤C≤0.35%, 0.50%≤Mn≤1.70%; 0.50%≤Cr≤1.70%; traces≤Mo≤0.15%; traces≤Si≤0.40%; traces≤Ni≤0.50%; traces≤Cu≤0.50%; traces≤V≤0.08%; traces≤Al≤0.10%; 0.001%≤B≤0.010%; 0.01%≤Ti≤0.06%; traces≤Nb≤0.05%; traces≤S≤0.15%; traces≤Ca≤0.010%; traces≤Te≤0.030%; traces≤Se≤0.050%; traces≤Bi≤0.050%; traces≤Pb≤0.100%; traces≤P≤0.100%; traces≤N≤0.013%; with 540≤(830−270*C %−90*Mn %−70*Cr %−83*Mo %−37*Ni %)≤600 and Ti %≥2.5N %. The microstructure consists of at least 70% bainitic ferrite and carbides or residual austenite, the residual austenite fraction being at most 10%, at most 30% martensite and/or proeutectoid ferrite and/or pearlite, the proeutectoid ferrite and/or pearlite fraction being at most 10%.

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First Claim