AlMgSi-BASED ALUMINUM ALLOY HAVING HIGH MACHINABILITY, MANUFACTURING METHOD THEREOF AND AUTOMOTIVE PARTS MANUFACTURED THEREFROM

Abstract

The present invention relates to an AlMgSi-based aluminum alloy comprising 1.0-1.4 wt % of silicon (Si), 0.70-0.85 wt % of magnesium (Mg), 0.8-1.20 wt % of tin (Sn), 0.01-0.4 wt % of manganese (Mn), 0.001-0.50 wt % of iron (Fe), 0.01-0.10 wt % of copper (Cu), 0.01-0.25 wt % of chromium (Cr), 0.01-0.20 wt % of zinc (Zn), and the balance of unavoidable impurities and aluminum (Al), and to a manufacturing method thereof.

1 . An AlMgSi-based aluminum alloy comprising 1.0-1.4 wt % of silicon (Si), 0.70-0.85 wt % of magnesium (Mg), 0.8-1.20 wt % of tin (Sn), 0.01-0.4 wt % of manganese (Mn), 0.001-0.50 wt % of iron (Fe), 0.01-0.10 wt % of copper (Cu), 0.01-0.25 wt % of chromium (Cr), 0.01-0.20 wt % of zinc (Zn), and a balance of unavoidable impurities and aluminum (Al). 
     
     
         2 . The AlMgSi-based aluminum alloy of  claim 1 , wherein the content of manganese (Mn) in the alloy is 0.01-0.35 wt %. 
     
     
         3 . The AlMgSi-based aluminum alloy of  claim 1 , wherein the content of the unavoidable impurities in the alloy is 0.05-0.15 wt %. 
     
     
         4 . The AlMgSi-based aluminum alloy of  claim 1 , wherein the content of titanium (Ti) in the AlMgSi-based aluminum alloy is 0 wt %. 
     
     
         5 . The AlMgSi-based aluminum alloy of  claim 1 , wherein the sum of the contents of silicon (Si), magnesium (Mg), tin (Sn) and manganese (Mn) in the AlMgSi-based alloy is 3.0-3.3 wt %. 
     
     
         6 . The AlMgSi-based aluminum alloy of  claim 1 , wherein the sum of the contents of iron (Fe), copper (Cu), chromium (Cr) and zinc (Zn) in the AlMgSi-based alloy is 0.01-0.5 wt %. 
     
     
         7 . A method for manufacturing an AlMgSi-based aluminum alloy, the method comprising: preparing a billet from an AlMgSi-based aluminum alloy composition, comprising 1.0-1.4 wt % of silicon (Si), 0.70-0.85 wt % of magnesium (Mg), 0.8-1.20 wt % of tin (Sn), 0.01-0.4 wt % of manganese (Mn), 0.001-0.50 wt % of iron (Fe), 0.01-0.10 wt % of copper (Cu), 0.01-0.25 wt % of chromium (Cr), 0.01-0.20 wt % of zinc (Zn), and the balance of unavoidable impurities and aluminum (Al), by a continuous casting process; and subjecting the prepared billet to homogenizing heat treatment, extrusion, stretching and aging heat treatment. 
     
     
         8 . The method of  claim 7 , wherein the content of manganese (Mn) in the aluminum alloy composition is 0.01-0.35 wt %. 
     
     
         9 . The method of  claim 7 , wherein the content of titanium (Ti) in the AlMgSi-based aluminum composition is 0 wt %. 
     
     
         10 . The method of  claim 7 , wherein the sum of the contents of silicon (Si), magnesium (Mg), tin (Sn) and manganese (Mn) in the AlMgSi-based aluminum alloy composition is 3.0-3.3 wt %. 
     
     
         11 . The method of  claim 7 , wherein the sum of the contents of iron (Fe), copper (Cu), chromium (Cr) and zinc (Zn) in the AlMgSi-based aluminum alloy composition is 0.01-0.5 wt %. 
     
     
         12 . An automotive part made of the AlMgSi-based aluminum alloy of  claim 1 . 
     
     
         13 . The automotive part of  claim 12 , wherein the content of manganese (Mn) in the alloy is 0.01-0.35 wt %. 
     
     
         14 . The automotive part of  claim 12 , wherein the content of the unavoidable impurities in the alloy is 0.05-0.15 wt %. 
     
     
         15 . The automotive part of  claim 12 , wherein the content of titanium (Ti) in the AlMgSi-based aluminum alloy is 0 wt %. 
     
     
         16 . The automotive part of  claim 12 , wherein the sum of the contents of silicon (Si), magnesium (Mg), tin (Sn) and manganese (Mn) in the AlMgSi-based alloy is 3.0-3.3 wt %. 
     
     
         17 . The automotive part of  claim 12 , wherein the sum of the contents of iron (Fe), copper (Cu), chromium (Cr) and zinc (Zn) in the AlMgSi-based alloy is 0.01-0.5 wt %.