Provided is a steel continuous casting method capable of improving the quality of a cast piece cast in the period after the casting completion. A steel continuous casting method of performing continuous casting while a cast piece (3) is subjected to rolling reduction includes subjecting a cast piece (3) being continuously cast to rolling reduction and, after the casting completion, changing a rolling reduction gradient in a segment (14) of applying the rolling reduction, to control a rolling reduction speed within a predetermined range.

A continuous casting method for steel and a continuous casting machine for steel are disclosed. A continuous casting method for steel includes: applying rolling reduction to a cast piece to be continuously cast at a rolling reduction rate of 0.3 mm/min or more and 2.0 mm/min or less in a range where a center solid phase ratio being a solid phase ratio in a thickness center of the cast piece is at least 0.2 or more and less than 1.0, in which a segment deflection T being a deflection in the thickness direction of a segment frame of the segment (18) where the rolling reduction is applied to the cast piece satisfies Equation (1).

2A/(n1)3.2521.3(1)

A continuous casting method for steel and a continuous casting machine for steel are disclosed. A continuous casting method for steel includes: applying rolling reduction to a cast piece to be continuously cast at a rolling reduction rate of 0.3 mm/min or more and 2.0 mm/min or less in a range where a center solid phase ratio being a solid phase ratio in a thickness center of the cast piece is at least 0.2 or more and less than 1.0, in which a segment deflection T being a deflection in the thickness direction of a segment frame of the segment (18) where the rolling reduction is applied to the cast piece satisfies Equation (1).

2A/(n1)3.2521.3(1)

A device for producing hot-rolled metal strips has a casting machine that produces and transports slabs in a transport line of the casting machine. A rolling mill forms the slabs into corresponding metal strips during transport along a transport line of the rolling mill. A combination transport and temperature-influencing device is arranged between the casting machine and the rolling mill transports the slabs at least along the transport line of the rolling mill, feeds the slabs to the rolling mill and sets the temperature of the slabs to a rolling temperature. A surface device is arranged between the casting machine and the combination transport and temperature-influencing device and processes and/or treats and/or inspects at least one of the surfaces of the slabs. A temperature-influencing device is arranged between the casting machine and the combination transport and temperature-influencing device and modifies the temperature of the slabs.

A device for producing hot-rolled metal strips has a casting machine that produces and transports slabs in a transport line of the casting machine. A rolling mill forms the slabs into corresponding metal strips during transport along a transport line of the rolling mill. A combination transport and temperature-influencing device is arranged between the casting machine and the rolling mill transports the slabs at least along the transport line of the rolling mill, feeds the slabs to the rolling mill and sets the temperature of the slabs to a rolling temperature. A surface device is arranged between the casting machine and the combination transport and temperature-influencing device and processes and/or treats and/or inspects at least one of the surfaces of the slabs. A temperature-influencing device is arranged between the casting machine and the combination transport and temperature-influencing device and modifies the temperature of the slabs.