Automotive door beam made of aluminum alloy extruded material

Abstract

Provided is, as a material for an automotive door beam, a 7000-series aluminum alloy extruded material having excellent SCC resistance in a higher strength range (proof stress of 460 MPa or greater) than ever before. The 7000-series aluminum alloy extruded material comprises 7.5-9.0 mass% of Zn; 1.3-2.0 mass% of Mg; 0.1-0.7 mass% of Cu; at most 0.15 mass% of Si; at most 0.3 mass% of Fe; 0.005-0.2 mass% of Ti; 0.1-0.5 mass% of at least one among Mn, Cr, and Zr within a range, wherein Mn is 0.3 mass% or less, Cr is 0.25 mass% or less, and Zr is 0.25 mass% or less; and the remainder consisting of Al and impurities. A Fe-based crystallized substance is contained, and the average Cu content thereof is 5.0 mass% or less.

Description

technical field [0001] The invention relates to an automobile door anti-collision beam formed of 7000 series aluminum alloy extruded material. Background technique [0002] The door anti-collision beam of an automobile is assembled inside the door in the front-rear direction in order to protect passengers from collisions from the side of the vehicle body. For the anti-collision beam of the car door, it is required to have anti-shock absorption performance. For example, in regulations such as FMVSS (Federal Vehicle Safety Standards of the United States), there are fixed settings for the maximum load value and energy absorption of the door anti-collision beam obtained by the three-point bending test. standard. [0003] A 7000-series (Al-Zn-Mg-series) high-strength aluminum alloy extruded material is used as the material for the door impact beam in order to achieve both high-impact shock-absorbing performance and lightweight automotive parts. [0004] In Patent Documents 1 to...

AI Technical Summary

Problems solved by technology

However, as the regulations such as the FMVSS etc. have further tightened the side impact regulations on automobile doors, if the 7000-series aluminum alloy extruded material with the current level of strength is used to achieve a higher impact absorption performance, the door anti-collision beam weight gain

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