FIELD: metallurgy.
SUBSTANCE: invention relates to deformed products made from aluminium-copper-lithium alloys and can be used for the manufacture of structural elements for the aerospace industry. Method for semi-continuous casting of an aluminium-copper-lithium alloy involves obtaining a liquid metal bath from an alloy containing, in wt. %: Cu 2.0–6.0; Li 0.5–2.0; Mg 0–1.0; Ag 0–0.7; Zn 0–1.0; and at least one element selected from the group of Zr, Mn, Cr, Sc, Hf and Ti, impurities ≤ 0.15 in total and ≤ 0.05 each, the balance is aluminium, semi-continuous vertical casting to produce a slab, wherein hydrogen content in the liquid metal bath is maintained below 0.4 ml / 100 g, and oxygen content, measured above the melt surface, below 0.5 vol. %, casting is carried out using a distributor made of carbon fabric having a lower surface, an upper surface bounding an opening through which liquid metal is introduced, and a wall of rectangular cross section, the wall comprising two longitudinal parts parallel to the slab width and two transverse parts parallel to the slab thickness, the transverse and longitudinal parts being formed by two fabrics, the first semi-rigid and locking fabric, which maintains the shape of the distributor during casting, and a second non-locking fabric that allows the liquid metal to pass and filter, the first and second fabrics are connected to each other with or without an overlap and without a gap separating them, with the first fabric continuously covering at least 30 % of the surface of the wall parts and positioned so that the surface of the liquid metal is in contact with it over the entire cross section.
EFFECT: method is aimed at improving mechanical properties of products with a large thickness.
20 cl, 6 dwg, 3 tbl, 1 ex
