ELEMENT, WHICH ABSORBS ENERGY WITH THE COLLISION OF VEHICLE, VERSATILE BY OUTSTANDING ENERGY-ABSORBING CHARACTERISTICS, AND ALSO METHOD OF ITS PRODUCTION

摘要

1. An element that absorbs collision energy vehicles configured by forming a high-strength thin steel sheet having a tear strength TS of at least 980 MPa, and the constant n and the limit bending radius Rc, which satisfy the equation below (1): Rc / t≤ 1,31 × ln (n) + 5,21 ... (1) where Rc - limiting the bending radius (mm), t - thickness of sheet (mm), and n - constant n, calculated for the true strain in the range from 5% to 10 .2%. The element absorbs collision energy vehicles, obtained by molding a high-strength thin steel sheet having a tear strength TS of at least 980 MPa, and the constant n and the limit bending radius Rc, which satisfy the following equation (2): Rc / t≤1, 31 × ln (n) + 4,21 ... (2) wherein Rc - limiting the bending radius (mm), t - thickness of sheet (mm), and n - constant n, calculated for the true strain in the range from 5% to 10% .3. The element absorbs collision energy vehicles, according to claim 1 or 2, wherein the high strength thin steel sheet having a chemical composition comprising, in mass%: C: 0.14 to 0,30; Si:. 0.01 to 1,6; Mn: from 3.5 to 10; P: 0,060 or less; S: 0,0050 or less; Al: from 0.01 to 1,5; N: 0,0060 or less; Nb: 0 01 to 0.10; iFe and incidental impurities - the rest, and wherein the high-strength steel sheet has a microstructure containing a ferrite phase in an amount of from 30 to 70% by volume of the entire microstructure and a secondary phase other than the ferrite phase, the mean grain size of ferrite phase is 1.0 um or less, the secondary phase contains at least a residual austenite phase of at least 10% by volume of the entire microstructure, and an average interplanar spacing residual austenite phase with