An edge dam of a twin roll type strip caster is provided as a refractory material having a sealing member for sealing both end surfaces of a pair of casting rolls, and is pressed and raised according to wear of the sealing member. To uniformly maintain a contact area of the sealing member and the casting roll in a process in which the edge dam is moved while the edge dam is pressed and raised, both sides and a lower part of the sealing member are formed as an inclined surface inclined inwardly of the sealing member. An angle of inclination of the inclined surface is increased in a direction in which the sealing member is raised, and the angle of inclination of the inclined surface is obtained by a relationship between a moving distance l due to raising of the edge dam and a wear depth d.

There is provided a twin roll strip casting method. The twin roll strip casting method includes: continuously producing a strip by forming a molten steel pool using rotating rolls and edge dams contacting ends of the rotating rolls, and supplying molten steel to the molten steel pool; and lifting the edge dams by taking an amount of wear of the edge dams, occurring during casting, into consideration.

A side dam for a continuous twin roll caster with a body of refractory material shaped to form a side dam and having edge portions adapted to engage end portions of casting rolls of a twin roll caster and having a nip portion adapted to be adjacent a nip between the casting rolls and having upper portions extending across the side dam to form a lateral restraint for a casting pool of molten metal during operation in the twin roll caster; and a pocket between 5 and 50 mm in depth formed in the body between the edge portions and forming shoulder portions in the body between the edge portions and the pocket adapted to be worn as a casting campaign continues until the pocket is reached and continuing to be worn away at level of base portions of the pocket until casting is completed.