A gas wiping nozzle manufactured from parts divided along the slit length direction and maintains a gap in the width direction over the length direction in high temperature atmospheres and a method for manufacturing a hot-dip metal strip. In a gas wiping nozzle, a first and a second nozzle member are each divided along the length direction X of a slit into a plurality of nozzle members. The dimension of a divided face of the first nozzle member is 1.5T1 or more in a section of the first nozzle member where T1 is the thickness of the first nozzle member in the width direction Z of the slit, and the dimension of a divided face of the second nozzle member is 1.5T2 or more in a section of the second nozzle member where T2 is the thickness of the second nozzle member in the width direction Z of the slit.

A gas wiping nozzle manufactured from parts divided along the slit length direction and maintains a gap in the width direction over the length direction in high temperature atmospheres and a method for manufacturing a hot-dip metal strip. In a gas wiping nozzle, a first and a second nozzle member are each divided along the length direction X of a slit into a plurality of nozzle members. The dimension of a divided face of the first nozzle member is 1.5T1 or more in a section of the first nozzle member where T1 is the thickness of the first nozzle member in the width direction Z of the slit, and the dimension of a divided face of the second nozzle member is 1.5T2 or more in a section of the second nozzle member where T2 is the thickness of the second nozzle member in the width direction Z of the slit.

An apparatus for treating a metal strip after it has exited from a coating container with a liquid coating material, for example zinc is provided. The apparatus includes a blow-off device arranged above the coating container having an air outlet gap for blowing off excess parts of the still liquid coating material from the surface of the metal strip after the passing of the metal strip through the coating container. An electromagnetic stabilizer is arranged above the blow-off device and has a plurality of individual magnets for stabilizing the metal strip after leaving the coating container and the blow-off device. In order to further increase the efficiency of the apparatus, at least some of the magnets of the stabilizer are formed as pot magnets with pot coils.

An apparatus for treating a metal strip after it has exited from a coating container with a liquid coating material, for example zinc is provided. The apparatus includes a blow-off device arranged above the coating container having an air outlet gap for blowing off excess parts of the still liquid coating material from the surface of the metal strip after the passing of the metal strip through the coating container. An electromagnetic stabilizer is arranged above the blow-off device and has a plurality of individual magnets for stabilizing the metal strip after leaving the coating container and the blow-off device. In order to further increase the efficiency of the apparatus, at least some of the magnets of the stabilizer are formed as pot magnets with pot coils.

Provided is a plated steel sheet applicable for various purposes as in construction materials, household electric appliances, automobiles, etc. and, more particularly, to a hot dip plated steel sheet having excellent corrosion resistance and workability and a manufacturing method therefor.

Provided is a plated steel sheet applicable for various purposes as in construction materials, household electric appliances, automobiles, etc. and, more particularly, to a hot dip plated steel sheet having excellent corrosion resistance and workability and a manufacturing method therefor.

A method for setting the production schedule of a multiplicity of galvanized coils of metallic strip on a continuous galvanizing line is provided, the method including the steps of evaluating, for each possible combination of two uncoated coils, the impact of the transition from the first uncoated coil to the second uncoated coil on the quality of the galvanized coils, allocating to each possible combination of uncoated coils a weighting factor which depends on the results of the previous step and which takes into account the line constraints, computing the results of the previous step by calculating, for a number of possible schedules of the multiplicity of uncoated coils, a score which depends on the sum of the weighting factors attributed to the combinations of uncoated coils involved in the given schedule and by selecting the schedule with the optimal score.

The present invention relates to a gas wiping device for controlling the thickness of a coating layer deposited on a running metal strip plated with molten metal (1) in an industrial hot-dip installation, comprising a main nozzle unit (5) and a secondary nozzle unit (5A), to blow a wiping jet on the surface of the running strip, said main nozzle unit (5) and secondary nozzle unit (5A) being respectively provided with a main and secondary chamber (6, 6A) fed by pressurized non-oxidizing gas and with at least a main and N secondary elongated nozzle slot (7, 7A) formed in the tip of the respective main and secondary nozzle units (5, 5A), said tips comprising each an external top side (13, 13A), facing in use the downstream side of the running strip (1), and making an angle with the running strip surface, wherein the secondary nozzle unit (5A) is adjacent the main nozzle unit (5) over the external top side (13) of the main nozzle unit tip, so that the upper external surface (13A) of the secondary nozzle unit (5A) is designed to form, in use, an angle with the running strip surface comprised between 5° and 45°, wherein the thickness of the second slot opening (7A) is comprised between 1.5 and 3 times the thickness of the first slot opening (7), characterized in that the tip of the secondary nozzle unit has an external top side prolonged downstream by a first baffle plate making a first angle in use with respect to the running strip, so as to form a gas confinement region.

The present invention relates to a gas wiping device for controlling the thickness of a coating layer deposited on a running metal strip plated with molten metal (1) in an industrial hot-dip installation, comprising a main nozzle unit (5) and a secondary nozzle unit (5A), to blow a wiping jet on the surface of the running strip, said main nozzle unit (5) and secondary nozzle unit (5A) being respectively provided with a main and secondary chamber (6, 6A) fed by pressurized non-oxidizing gas and with at least a main and N secondary elongated nozzle slot (7, 7A) formed in the tip of the respective main and secondary nozzle units (5, 5A), said tips comprising each an external top side (13, 13A), facing in use the downstream side of the running strip (1), and making an angle with the running strip surface, wherein the secondary nozzle unit (5A) is adjacent the main nozzle unit (5) over the external top side (13) of the main nozzle unit tip, so that the upper external surface (13A) of the secondary nozzle unit (5A) is designed to form, in use, an angle with the running strip surface comprised between 5° and 45°, wherein the thickness of the second slot opening (7A) is comprised between 1.5 and 3 times the thickness of the first slot opening (7), characterized in that the tip of the secondary nozzle unit has an external top side prolonged downstream by a first baffle plate making a first angle in use with respect to the running strip, so as to form a gas confinement region.

A coating weight control apparatus includes: a strip passing position movement amount estimate part configured to estimate an movement amount of a strip passing position, in response to any of activation factors for movement of a strip passing position, that is, a welding point passing, a change in tension, and an operation of a correcting roll; and a nozzle position control part configured to shift each of positions of a front side nozzle and a back side nozzle by an amount corresponding to the movement amount of the strip passing position estimated by the strip passing position movement amount estimate part.