Aluminium alloy with increased resistance and low quench sensitivity
Abstract
An aluminium alloy having high mechanical strength and low quench sensitivity comprising 4.6 to 5.2 wt. % Zn, 2.6 to 3.0 wt. % Mg, 0.1 to 0.2 wt. % Cu, 0.05 to 0.2 wt. % Zr, max. 0.05 wt. % Mn, max. 0.05 wt. % Cr, max. 0.15 wt. % Fe, max. 0.15 wt. % Si, max. 0.10 wt. % Ti and aluminium as the remainder along with production related impurities, individually max. 0.05 wt. %, in total max. 0.15 wt. %. A process for producing plates having a thickness of more than 300 mm for manufacturing moulds for injection-moulding plastics is made up of the following steps: continuous casting the alloy into ingots having a thickness greater than 300 mm, heating the ingots to a temperature of 470 to 490° C. with a max. heating rate of 20° C./h between 170 and 410° C., homogenising the ingots for 10 to 14 h at a temperature of 470 to 490° C., cooling the ingots in still air to an intermediate temperature of 400-410° C., cooling the ingots by means of forced air cooling from the intermediate temperature of 400-410° C. to a temperature of less than 100° C., cooling the ingots to room temperature, artificially age-hardening the ingots at elevated temperature. The artificially age-hardened ingots can be employed for manu-facturing moulds for injection-moulding plastics.
Claims
exact text as granted — not AI-modified1 - 19 . (canceled)
20 . Aluminium alloy exhibiting high strength and low quench sensitivity comprising
4.6 to 5.2
wt. % Zn
2.6 to 3.0
wt. % Mg
0.1 to 0.2
wt. % Cu
0.05 to 0.2
wt. % Zr
max. 0.05
wt. % Mn
max. 0.05
wt. % Cr
max. 0.15
wt. % Fe
max. 0.15
wt. % Si
max. 0.10
wt. % Ti
the remainder being impurities due to the manufacturing process, individually at maximum 0.05 wt. %, in total at maximum 0.15 wt. %.
21 . Aluminium alloy according to claim 20 , comprising 4.6 to 4.8 wt. % Zn.
22 . Aluminium alloy according to claim 21 , comprising 2.6 to 2.8 wt. % Mg.
23 . Aluminium alloy according to claim 22 , comprising 0.10 to 0.15 wt. % Cu.
24 . Aluminium alloy according to claim 23 , comprising 0.08 to 0.18 wt. % Zr.
25 . Aluminium alloy according to claim 24 , including a maximum concentration of 0.03 wt. % Mn.
26 . Aluminium alloy according to claim 24 , including a maximum concentration of 0.02 wt. % Cr.
27 . Aluminium alloy according to claim 24 , including a maximum concentration of 0.12 wt. % Fe.
28 . Aluminium alloy according to claim 24 , including a maximum concentration of 0.12 wt. % Si.
29 . Aluminium alloy according to claim 24 , including a maximum concentration of 0.05 wt. % Ti.
30 . Process for manufacturing plates having a thickness up to 300 mm out of an aluminium alloy according to claim 20 , comprising the steps of:
(a) continuous casting the aluminium alloy as an ingot with a thickness greater than 300 mm, (b) heating the ingot at a maximum heating rate of 20° C./h between 170 and 410° C. to a temperature of 470 to 490° C., (c) homogenising the ingot for an interval of 10 to 14 h at a temperature of 470 to 490° C., (d) hot rolling the homogenised ingot to plate, (e) cooling the plate from a temperature of 400 to 410° C. to a temperature of less than 100° C., and (f) artificially age-hardening the plate.
31 . Process for manufacturing plates having a thickness of greater than 300 mm out of an aluminium alloy according to claim 20 , comprising the steps of:
(a) continuous casting the aluminium alloy as an ingot with a thickness greater than 300 mm, (b) heating the ingot at a maximum heating rate of 20° C./h between 170 and 410° .C to a temperature of 470 to 490° C., (c) homogenising the ingot for an interval of 10 to 14 h at a temperature of 470 to 490° C., (d) cooling the ingot to an intermediate temperature of 400 to 410° C., (e) cooling the ingot from the intermediate temperature of 400 to 410° C. to a temperature below 100° C., (f) further cooling the ingot to room temperature, (g) artificially age-hardening the ingot, and (h) forming the artificially age-hardened ingot into the plate.
32 . Process according to claim 31 , wherein the cooling of the ingot from the homogenisation temperature of 470-490° C. to the intermediate temperature of 400-410° C. takes place in still air.
33 . Process according to claim 11 or 12 , wherein the cooling of the ingot from the intermediate temperature of 400-410° C. to a temperature below 100° C. takes place by forced air cooling.
34 . Process according to claim 11 or 12 , wherein the cooling of the ingot from the intermediate temperature of 400-410° C. to a temperature below 100° C. takes place in a water-air-mist spray.
35 . Process according to claim 11 or 12 , wherein the artificial age-hardening is carried out, after storage at room temperature, in a first heat-treatment at a first temperature, followed by a second heat-treatment at a second temperature which is higher than the first temper-ature.
36 . Process according to claim 35 , including the steps of:
(1) 1-30 days storage at room temperature, (2) 6-10 h at a temperature of 90-100° C., and (3) 8-22 h at a temperature of 150-160° C.
37 . Process according to claim 36 , wherein the artificial age-hardening is carried out resulting in a heat-treatment condition T76.Join the waitlist — get patent alerts
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