Rolling installation for flat products

A metal band product rolling installation comprising:

• a fixed holding stand (1) having two separate standards (11a, 11b) each forming a closed frame comprising two stiles (12, 12'), an upper crossbeam (16) and a lower crossbeam (16'), and delineating a centre window (6),
• at least two rolls with parallel axes delineating a passage gap (15) for a product (M) following a rolling plane (P1) with the application, between the rolls, of a clamping load for rolling the product (M),
• at least one of the rolls being a back-up roll (3) for imparting a clamping load, the said back-up roll (3) being mounted to rotate round its axis and carried by two opposite end heads (35a, 35b), each mounted in a supporting part (4) resting on a side opposite to the gap (15), on a back-up face (63) of the corresponding crossbeam (16, 16') of each standard (11a, 11b),
• wherein, at least on one side of the rolling plane (P1), the crossbeam (16) of each standard (11a, 11b) is fitted with a back-up face (63) exhibiting, over the whole width of the window (6), a concave rounded profile extending on an angular sector of at least 180.degree. and the supporting part (4) of each end head (35a, 35b) of the back-up roll (3) rests on the said crossbeam (16) via a back-up part (42) delineated by a contact face (41) with a convex rounded profile matching that of the back-up face (63).