摘要:
The present invention concerns a thin slab nozzle for casting thin slabs made of metal at a very high mass-flow, said thin slab nozzle comprising: a central bore (50) defined by a bore wall and opening at inlet orifice (50μ) and extending therefrom along the longitudinal axis XI until it is closed at an upstream end (10μ) of a divider (10), said central bore comprising: an upstream bore portion (50a) comprising the inlet orifice and extending over a height, Ha, and, adjacent thereto, forming an upstream boundary (5a) with a converging bore portion (50e) of height He located in the connecting portion of the thin slab nozzle, and adjacent thereto a thin bore portion (50f) of height Hf located in the diffusing portion of the thin slab nozzle and ending at the level of the upstream end (10μ) of the divider (10), first and second front ports (51) separated from one another by said divider (10) and coupled to the central bore portion (50a) at least partially at the converging bore portion (50e); characterized in that, in a section of the thin slab nozzle along the first symmetry plane Π1 defined by (X1, X2) wherein X2 is normal to X1, the geometry of the wall of the central bore (50) is characterized as follows: - the radius of curvature at any point of the bore wall of the converging bore portion (50e) is finite, and the ratio of the height, Hf, of the thin bore portion (50f) to the height, He, of the converging bore portion (50e) is not more than 1, Hf/He ≤1.
摘要:
The present invention concerns a thin slab nozzle for casting thin slabs made of metal at a very high mass-flow, said thin slab nozzle comprising: a central bore (50) defined by a bore wall and opening at inlet orifice (50μ) and extending therefrom along the longitudinal axis XI until it is closed at an upstream end (10μ) of a divider (10), said central bore comprising: an upstream bore portion (50a) comprising the inlet orifice and extending over a height, Ha, and, adjacent thereto, forming an upstream boundary (5a) with a converging bore portion (50e) of height He located in the connecting portion of the thin slab nozzle, and adjacent thereto a thin bore portion (50f) of height Hf located in the diffusing portion of the thin slab nozzle and ending at the level of the upstream end (10μ) of the divider (10), first and second front ports (51) separated from one another by said divider (10) and coupled to the central bore portion (50a) at least partially at the converging bore portion (50e); characterized in that, in a section of the thin slab nozzle along the first symmetry plane Π1 defined by (X1, X2) wherein X2 is normal to X1, the geometry of the wall of the central bore (50) is characterized as follows: - the radius of curvature at any point of the bore wall of the converging bore portion (50e) is finite, and the ratio of the height, Hf, of the thin bore portion (50f) to the height, He, of the converging bore portion (50e) is not more than 1, Hf/He ≤1.
摘要:
An integrated plant with very low environmental impact for producing coils of hot-rolled and cold-rolled steel strip comprises a foundry section (SF) for producing liquid steel directly connected to a continuous casting and hot rolling section (CCHR) with final winding of the strip into coils, which section (CCHR) is in turn connected to a cold rolling section (PCR) that is in connection with a finishing section (CF), said plant further comprising a longitudinal slitting section (SL) suitable to receive coils from each of said three working sections (CCHR, PCR, CF), a vehicle shredding section (AS) suitable to produce metal scrap fit for use as raw material in the foundry section (SF), a vehicle shredding residue burning section (ASRB) suitable to generate current to supply the plant, and a foundry slag treating section suitable to recycle the slag and recover heat therefrom.
摘要:
A process for the endless or batch production of strips and plates of hot-rolled steel, with thickness from 0,6 mm to 50 mm, comprises the continuous casting (1) with liquid core reduction of a thin slab (S) having a minimum thickness of 80 mm, followed by a heating in an induction heater (2), a finishing rolling (4), a controlled cooling (6) and a final shearing (5; 8), and further includes prior to said heating in an induction heater (2) an initial rolling (10) with a thickness reduction of the slab (S) of only about 10% and in any case not more than 20%, starting from a thickness reduction of about 8 mm.