US2004261922A1PendingUtilityA1
Wrought aluminium-magnesium alloy product
Priority: Aug 10, 2001Filed: Jul 31, 2002Published: Dec 30, 2004
Est. expiryAug 10, 2021(expired)· nominal 20-yr term from priority
Inventors:Job Anthonius Van Der HoevenLinzong ZhuangBruno SchepersPeter De SmetJean Pierre Jules Baekelandt
F17C 2223/036F16J 12/00F17C 2203/0646C22C 21/06F17C 2203/0648F17C 1/14B23K 35/286F17C 2270/0178F17C 2260/053
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Claims
Abstract
The invention relates to a wrought aluminium-magnesium alloy product, having a composition (in wt. %) of: 3.1<Mg<4.5; 0.4<Mn<0.85; 0.4<Zn<0.8; 0.06<Cu<0.35; Cr<0.25; Fe<0.35; Si<0.2; Zr<0.25; Ti<0.3; others≦0.05, each up to a total of max. 0.15, and balance aluminium.
Claims
exact text as granted — not AI-modifiedIn the claims
1 . Wrought aluminium-magnesium alloy rolled product, having a composition (in wt. %) of:
3.1<Mg<4.5 0.4<Mn<0.85 0.4<Zn<0.8 0.06<Cu<0.35
Cr<0.25
Fe<0.35
Si<0.2
Zr<0.25
Ti<0.3
impurities each≦0.05, total of max. 0.15,
and balance aluminium.
2 . Product according to claim 1 , wherein the amount of Mg is more than 3.6 wt. %.
3 . Product according to claim 1 , wherein the amount of Mg is at least 3.8 wt. %.
4 . Product according to claim 1 , wherein the amount of Mg is at least 4.05 wt. %.
5 . Product according to claim 1 , wherein the amount of Mg does not exceed 4.4 wt. %.
6 . Product according to claim 1 , wherein the amount of Mn does not exceed 0.69 wt. %.
7 . Product according to claim 1 , wherein the amount of Mn does not exceed 0.6 wt. %.
8 . Product according to claim 1 , wherein the amount of Mn is more than 0.45 wt. %.
9 . Product according to claim 1 , wherein the amount of Mn is more than 0.5 wt. %.
10 . Product according to claim 1 , wherein the amount of Zn does not exceed 0.75 wt. %.
11 . Product according to claim 1 , wherein the amount of Zn does not exceed 0.6 wt. %.
12 . Product according to claim 1 , wherein the amount of Fe is less than 0.20 wt. %.
13 . Product according to claim 1 , wherein the amount of Cu is more than 0.075 wt. %.
14 . Product according to claim 1 , wherein the amount of Cu is more than 0.1 wt. %.
15 . Product according to claim 1 , wherein the amount of Cu is less than 0.24 wt. %.
16 . Product according to claim 1 , wherein the amount of Cu is less than 0.18 wt. %.
17 . Product according to claim 1 , wherein the amount of Cu is less than 0.15 wt. %.
18 . Product according to claim 1 , wherein the amount of Si is maximum 0.12 wt. %.
19 . Product according to claim 1 , wherein the amount of Si is maximum 0.10 wt. %.
20 . Product according to claim 1 , wherein the amount of Zr does not exceed 0.05 wt. %.
21 . Product according to claim 1 , wherein the amount of Zr is less than 0.01 wt. %.
22 . Product according to claim 1 , wherein the amount of Cr is in range of 0.06 to 0.2 wt. %.
23 . Product according to claim 1 , wherein the amount of Cr is in a range of 0.11 to 0.2 wt. %.
24 . Product according to claim 1 , wherein the product is provided in an O-temper condition.
25 . Product according to claim 1 , wherein the weight loss after sensitizing for 100 hours at 100° C. is less than 15 mg/cm 2 when tested against intergranular corrosion in accordance with ASTM G67.
26 . Product according to claim 1 , wherein the weight loss after sensitizing for 100 hours at 100° C. is less than 10 mg/cm 2 when tested against intergranular corrosion in accordance with ASTM G67.
27 . Product according to claim 1 , wherein the product has an elongation A50 of at least 20%.
28 . Product according to claim 1 , wherein the product has a gauge in the range of 0.7 to 4 mm.
29 . Product according to claim 1 , wherein the product has a gauge in the range of 1.6 to 2.4 mm.
30 . Product according to claim 1 , having a composition (in wt. %) consisting of:
3.1<Mg<4.5 0.4<Mn<0.85 0.4<Zn<0.8 0.06<Cu<0.35
Cr<0.25
Fe<0.35
Si<0.2
Zr<0.25
Ti<0.3
impurities each≦0.05, total of max. 0.15,
and balance aluminium.
31 . Welded structure, comprising at least one section of the product according to claim 1 .
32 . Pressure vessel comprising a shell that comprises the wrought aluminium-magnesium alloy product according to claim 1 .
33 . Method of producing a wrought aluminium alloy product comprising the steps:
(i) providing an intermediate alloy product having a composition according to the composition according to claim 1; (ii) cold working the intermediate alloy product to a final gauge to obtain an intermediate wrought product; (iii) annealing the intermediate wrought product by heating the product at a heating rate in the range of 2 to 200° C./sec, holding the product at a soaking temperature in the range of 480 to 570° C. for a duration of at most 100 sec, followed by a cooling at a cooling rate in the range of 10 to 500° C./sec to below a temperature of 150° C.
34 . Method according to claim 33 , wherein the product is held at the soaking temperature in the range of 480 to 570° C. for a duration of at most 40 sec.
35 . Method according to claim 33 , wherein the soaking temperature during step (iii) is in the range of 520 to 550° C.
36 . Method according to claim 33 , wherein the heating rate during step (iii) is at least 50° C./sec.
37 . Method according to claim 33 , wherein the heating rate during step (iii) is at least 80° C./sec.
38 . Method according to claim 33 , wherein the final gauge of the aluminium sheet is at most 4 mm.
39 . Method according to claim 33 , wherein the final gauge of the aluminium sheet is at most 2.4 mm.
40 . Method according to claim 33 , wherein the final gauge of the aluminium sheet is in a range of 1.6 to 2.4 mm.Join the waitlist — get patent alerts
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