US2025019802A1PendingUtilityA1

A 6xxx alloy for extrusion with improved properties and a process for manufacturing extruded products

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Assignee: NORSK HYDRO ASPriority: Nov 24, 2021Filed: Nov 23, 2022Published: Jan 16, 2025
Est. expiryNov 24, 2041(~15.3 yrs left)· nominal 20-yr term from priority
Inventors:Ulf TundalOddvin ReisoEva Anne MørtsellHelen WeykampJostein RøysetMartha Indriyati
C22F 1/05B21C 23/04B21C 35/023B21C 23/085B21C 29/003C22F 1/047C22C 21/08
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Claims

Abstract

The present invention relates to an Al—Mg—Si aluminium alloy comprising in wt %: Mg: 0.45-1.2Si: 0.40-1.0Ti: 0.05-0.20V: 0.05-0.15Cu: <0.30Mn: <0.30Cr<0.15Zr<0.15Fe<0.50Zn<0.50 the rest being aluminium and inevitable impurities, N wherein the content of Ti+V is 0.10-0.30, the Sieff/Mg ratio being <1.0, having improved ductility and crush properties with good energy absorption, corrosion resistance and temperature stability, and which is particularly useful for structural components in crash exposed areas in vehicles.

Claims

exact text as granted — not AI-modified
1 . A 6xxx aluminium alloy comprising in wt %:
 Mg: 0.45-1.2;   Si: 0.40-1.0;   Ti: 0.05-0.20;   V: 0.05-0.15;   Cu: <0.30;   Mn: <0.30;   Cr: <0.15;   Zr: <0.15;   Fe: <0.50;   Zn: <0.50;   the rest being aluminium and inevitable impurities, wherein the content of Ti+V is 0.10-0.30, the Si eff /Mg ratio being <1.0.   
     
     
         2 . The 6xxx aluminium alloy according to  claim 1 , wherein the content of Ti is 0.07-0.12 wt %. 
     
     
         3 . The 6xxx aluminium alloy according to  claim 1 , wherein the content of V is 0.07-0.12 wt %. 
     
     
         4 . The 6xxx alloy according to  claim 1 , wherein the content of Ti+V from 0.14 to 0.24 wt %, or from 0.15 to 0.20 wt %. 
     
     
         5 . The 6xxx aluminium alloy according to  claim 1 , wherein the Si eff /Mg ratio is 0.50-0.96. 
     
     
         6 . The 6xxx aluminium alloy according to  claim 5 , wherein the Si eff /Mg ratio is 0.60-0.85, or 0.65-0.75. 
     
     
         7 . The 6xxx aluminium alloy according to  claim 5 , wherein the Si eff /Mg ratio is 0.80-0.96. 
     
     
         8 . The 6xxx aluminium alloy according to  claim 1 , wherein the content of Si is 0.45-0.65 wt % and the content of Mg is 0.55-0.75 wt %. 
     
     
         9 . The 6xxx aluminium alloy according to  claim 8 , wherein the content of Si is 0.45-0.55 wt % and the content of Mg is 0.55-0.65 wt %. 
     
     
         10 . The 6xxx aluminium alloy according to  claim 1 , wherein the content of Mn is 0.10-0.20 wt %. 
     
     
         11 . The 6xxx aluminium alloy according to  claim 1 , wherein the content of Cu is <0.20, or from 0.08 to 0.15 wt %. 
     
     
         12 . The 6xxx aluminium alloy according to  claim 1 , wherein the content of Cr is <0.08 wt. %, or <0.05 wt %. 
     
     
         13 . A process for manufacturing extruded products from the alloy according to  claim 1 , wherein the said process comprises the following steps
 a. casting a billet from a 6xxx aluminium alloy comprising in wt %:   Mg: 0.45-1.2;   Si: 0.40-1.0;   Ti: 0.05-0.15;   V: 0.05-0.15;   Cu: <0.30;   Mn: <0.30;   Cr: <0.15;   Zr: <0.15;   Fe: <0.50;   Zn: <0.50;   the rest being aluminium and inevitable impurities; wherein the content of Ti+V is 0.10-0.30, and the Si eff /Mg ratio is <1.0;   b. homogenising the cast billet at a temperature between 48° and 600° C. for 1-24 hours;   c. cooling the homogenised billet;   d. extruding said billet to form an extruded product;   e. cooling the extruded product down to room temperature using a cooling rate of less than 80° C./second;   f. optionally stretching of the profile; and   g. ageing the extruded product.   
     
     
         14 . The process for manufacturing extruded products according  claim 13 , wherein the stretching in step f is 1.5-4%. 
     
     
         15 . The process for manufacturing extruded products according to  claim 14 , wherein the stretching in step f is 1.5-3%. 
     
     
         16 . The process for manufacturing extruded products according to  claim 13 , wherein the cooling rate of step e. is less than 40° C./second, or less than 20° C./second. 
     
     
         17 . The process for manufacturing extruded products according to  claim 13 , wherein the cooling rate of step e. is more than 5° C./second, or more than 7° C./second. 
     
     
         18 . The process for manufacturing extruded products according to  claim 13 , wherein the content of Ti+V is 0.14-0.24, or 0.15-0.20. 
     
     
         19 . The process for manufacturing extruded products according to  claim 13 , wherein the Si eff /Mg ratio is 0.50-0.96. 
     
     
         20 . The process for manufacturing extruded products according to  claim 19 , wherein the Si eff /Mg ratio is 0.60-0.85, or 0.65-0.75, or 0.80-0.96. 
     
     
         21 . The process for manufacturing extruded products according to  claim 13 , wherein the content of Si is 0.45-0.65 wt % and the content of Mg is 0.55-0.75 wt %. 
     
     
         22 . The process for manufacturing extruded products according to  claim 21 , wherein the content of Si is 0.45-0.55 wt % and the content of Mg is 0.55-0.65 wt %. 
     
     
         23 . The process for manufacturing extruded products according to  claim 13 , wherein the content of Cu is <0.20, or from 0.08 to 0.15 wt %. 
     
     
         24 . The process for manufacturing extruded products according to  claim 13 , wherein the content of Cr is <0.08 wt. %, or <0.05 wt %. 
     
     
         25 . An extruded product manufactured according to  claim 13 , comprising a 6xxx aluminium alloy consisting in wt %:
 Mg: 0.45-1.2;   Si: 0.40-1.0;   Ti: 0.05-0.15;   V: 0.05-0.15;   Cu: <0.30;   Mn: <0.30;   Cr: <0.15;   Zr: <0.15;   Fe: <0.50;   Zn: <0.50;   the rest being aluminium and inevitable impurities, wherein the content of Ti+V is 0.10-0.30, the Si eff /Mg ratio being <1.0,   wherein the material of the final product has a recrystallized grain structure.   
     
     
         26 . The extruded product according to  claim 25 , wherein the extruded product is a structural component in crash exposed areas in vehicles.

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