Aluminum alloy extrusions and methods of making the same
By controlling the composition and manufacturing process of aluminum alloy extrusions, especially the Cr content and heat treatment, the problem of easy cracking of 7000 series aluminum alloy extrusions under high stress was solved, and the resistance to stress corrosion cracking and mechanical properties were improved.
CN117500950BActive Publication Date: 2026-07-07KOBE STEEL LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- KOBE STEEL LTD
- Filing Date
- 2022-05-26
- Publication Date
- 2026-07-07
AI Technical Summary
Technical Problem
In the existing technology, 7000 series aluminum alloy extrusions are prone to stress corrosion cracking under high stress conditions, and existing improvement measures are still insufficient.
Method used
By controlling the composition of aluminum alloy extrusions, especially the Cr content being between 0.050 and 0.160% by mass, and combining heating, cooling, and extrusion processes, it is ensured that Cr is dissolved in the Al matrix, including heating to 450–550°C, cooling to below 300°C, reheating to above 470°C, extrusion, and quenching treatment.
Benefits of technology
It significantly improves the stress corrosion cracking resistance of aluminum alloy extrusions, increases yield strength and elongation, and extends crack life in boiling chromic acid solution.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN117500950B_ABST
Abstract
An aluminum alloy extruded material, wherein a composition is composed of Zn: 3.0 to 6.0 mass%, Mg: 0.4 to 1.4 mass%, Fe: 0.05 to 0.2 mass%, Cu: 0.05 to 0.4 mass%, Ti: 0.005 to 0.2 mass%, Zr: 0.1 to 0.3 mass%, Cr: 0.050 to 0.160 mass%, and the balance: consisting of Al and inevitable impurities, and an electrical conductivity is 40.1 to 44.3% IACS.
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