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.

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.

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.

Abstract: A process for transforming a metal alloy (28) having a liquidus temperature and a solidus temperature into a part solid/part liquid shaped body. The metal alloy (28) is poured in the molten state at a temperature (TMo) into a mould (10) having an essentially cylindrical mould wall (12), whereby the mould (10) at the start of filling exhibits a starting temperature that lies below the liquidus temperature, the mould (10) is set into an eccentric rotational movement at a starting temperature for the metal alloy (28) lying above the liquidus temperature and the rotational movement maintained until the metal alloy (28) has cooled to a to a discharging temperature lying between the liquidus temperature and the solidus temperature corresponding to a desired solid/liquid ratio in the shaped body and the shaped body removed from the mould (10) at the discharging temperature.

Abstract: A process for manufacturing a strip of aluminium or an aluminium alloy for electrolytically roughened lithographic printing plate is such that the metal is continuously cast to a maximum thickness (da) of 4.5 mm, the cast strip is rolled without further heating to an intermediate thickness (dz) amounting to 30 to 80% of the total reduction in thickness (da-de), the strip which has been rolled to intermediate thickness (dz) is annealed in a temperature range of 250 to 320° C. in such a manner that at low strength recovery takes place without recrystallisation occurring, and the after the intermediate anneal, the strip is rolled to final thickness (de) without further heating. Lithographic printing plates manufactured according to the process exhibit good strength properties after a stove-lacquer process.