A tundish (10) for continuous metal casting, defining a cavity, wherein the cavity has a cavity height (h10) measured along a vertical axis (Z), a cavity length measured along a longitudinal axis (X), and a cavity width measured along a transverse axis (Y), with X⊥Y⊥Z, and wherein the cavity comprises:
- an inlet portion (10i) configured for receiving a flow of metal melt (20m) discharged by gravity from an outside of the tundish into the cavity of the tundish;
- an outlet portion (10o) comprising an outlet (11o) configured for discharging the metal melt out of the cavity into a mould;
- a filtering system separating over the whole cavity width the inlet portion (10i) from the outlet portion (10o), the filtering system comprising
- a filter module (1) extending over the whole cavity width and extending inside said cavity, wherein the filter module comprises an inlet side facing the inlet portion (10i) of the tundish and extending from a floor (10f) of the cavity to a top surface whose shortest distance from the floor measured along the vertical axis (Z) is equal to a minimum filter module height (h1), and wherein the filter module (1) comprises a filter unit (1f) extending over a filter height (hf) along the vertical axis (Z) and provided with channels (1c) extending,
- from a channel inlet, opening at an inlet side facing the inlet portion (10i) of the tundish,
- to a channel outlet, opening at an outlet side of the filter module (1) facing the outlet portion and separated from the inlet side by a filter depth (tf), and
- a wall module (2) comprising a wall extending over the whole cavity width and extending inside said cavity, and defining one or more openings (2o) distributed over a width of the wall and over an opening height (h2) measured along the vertical axis (Z) from the floor (10f),
- wherein the filter module (1) is arranged closer to the outlet (11o) than the wall module (2), and a bypass passage (2b) is defined between the wall module (2) and the filter module (1) of largest width (t12) measured along the longitudinal axis (X), such that the metal melt can only flow from the inlet portion to the inlet side of the filter module (1) through the one or more openings, and from the one or more openings to the outlet portion by flowing either through the channels of the filter unit (1f) or through the bypass passage (2b), and
- wherein,
- a wall ledge (2L) protrudes from the wall of the wall module (2) at a wall ledge distance (d2L) from the floor (10f) not larger than the minimum filter module height (h1) (i.e., d2L≤h1), and extends towards the inlet side of the filter module (1) without contacting the filter module (1), the wall ledge (2L) having a width (t2L) measured along the longitudinal axis (X), wherein 20 mm<t2L<t12,
- a filter ledge (1L) protrudes from the inlet side of the filter module (1) at a filter ledge distance (d1L) from the floor (10f) greater than the opening height (h2) (i.e., d1L≥h2), and is offset relative to the wall ledge (2L) (i.e., d1L≠d2L), the filter ledge extending towards the wall module (2) without contacting either the wall module or the wall ledge, the filter ledge (1L) having a width (t1L) measured along the longitudinal axis (X), wherein 20 mm<t1L<t12, and
- a ratio ((t1L+t2L)/t12), of the sum of the widths (t1L, t2L) of the filter and wall ledges (1L, 2L) to the largest width (t12) of the bypass passage (2b), is higher than 20% (i.e., 0.2≤(t1L+t2L)/t12).