Abstract: The present invention provides a production facility of hot dip galvannealed steel plate able to produce hot dip galvannealed steel plate on production conditions optimal at all times despite rapid changes in the steel type, plating deposition, and other external factors, wherein the production facility 1 of hot dip galvannealed steel plate is provided with a soaking/cooling furnace 7 for treating steel plate I running after leaving a rapid heating furnace 6 by at least one of soaking and cooling. Further, the soaking/cooling furnace 7 is configured to enable a change of the ratio in the furnace of the soaking region 15 for soaking steel plate I by soaking means 21 at a soaking temperature of 500° C. to 650° C. and the cooling region 16 for cooling the steel plate I by spray nozzles 22 by a 5° C./sec or more average cooling rate.

Abstract: The present invention provides a production facility of hot dip galvannealed steel plate able to produce hot dip galvannealed steel plate on production conditions optimal at all times despite rapid changes in the steel type, plating deposition, and other external factors, wherein the production facility 1 of hot dip galvannealed steel plate is provided with a soaking/cooling furnace 7 for treating steel plate I running after leaving a rapid heating furnace 6 by at least one of soaking and cooling. Further, the soaking/cooling furnace 7 is configured to enable a change of the ratio in the furnace of the soaking region 15 for soaking steel plate I by soaking means 21 at a soaking temperature of 500° C. to 650° C. and the cooling region 16 for cooling the steel plate I by spray nozzles 22 by a 5° C./sec or more average cooling rate.

Abstract: The present invention provides a highly corrosion-resistant plated steel sheet that can achieve excellent surface smoothness and formability and, according to the process of the present invention, a hot-dip galvanized steel product excellent in surface smoothness and formability having on the steel product surface a zinc alloy plating layer composed of 4 to 22% by mass of Al, 1 to 5% by mass of Mg, 0.000001 to 0.1% by mass of Ti, 0.000001 to 0.5% by mass of Si and the balance of Zn and unavoidable impurities, the plating layer of the plated steel product having a metal structure in which an [Mg2Si phase], an [Al phase], a [Zn2Mg phase] and a [Zn phase] are present in a mixture in the matrix of an [Al/Zn/Zn2Mg ternary eutectic structure], and the plating layer containing a Ti—Al base intermetallic compound in the [Al phase] and/or the [Zn2Mg phase] and/or the [Zn phase], is produced.

Abstract: The present invention provides a highly corrosion-resistant plated steel sheet that can achieve excellent surface smoothness and formability and, according to the process of the present invention, a hot-dip galvanized steel product excellent in surface smoothness and formability having on the steel product surface a zinc alloy plating layer composed of 4 to 22% by mass of Al, 1 to 5% by mass of Mg, 0.000001 to 0.1% by mass of Ti, 0.000001 to 0.5% by mass of Si and the balance of Zn and unavoidable impurities, the plating layer of the plated steel product having a metal structure in which an [Mg2Si phase], an [Al phase], a [Zn2Mg phase] and a [Zn phase] are present in a mixture in the matrix of an [Al/Zn/Zn2Mg ternary eutectic structure], and the plating layer containing a Ti—Al base intermetallic compound in the [Al phase] and/or the [Zn2Mg phase] and/or the [Zn phase], is produced.

Abstract: The present invention provides a highly corrosion-resistant plated steel sheet that can achieve excellent surface smoothness and formability and, according to the process of the present invention, a hot-dip galvanized steel product excellent in surface smoothness and formability having on the steel product surface a zinc alloy plating layer composed of 4 to 22% by mass of Al, 1 to 5% by mass of Mg, 0.000001 to 0.1% by mass of Ti, 0.000001 to 0.5% by mass of Si and the balance of Zn and unavoidable impurities, the plating layer of the plated steel product having a metal structure in which an [Mg2Si phase], an [Al phase], a [Zn2Mg phase] and a [Zn phase] are present in a mixture in the matrix of an [Al/Zn/Zn2Mg ternary eutectic structure], and the plating layer containing a Ti—Al base intermetallic compound in the [Al phase] and/or the [Zn2Mg phase] and/or the [Zn phase], is produced.

Abstract: The present invention provides a production facility of hot dip galvannealed steel plate able to produce hot dip galvannealed steel plate on production conditions optimal at all times despite rapid changes in the steel type, plating deposition, and other external factors, wherein the production facility 1 of hot dip galvannealed steel plate is provided with a soaking/cooling furnace 7 for treating steel plate I running after leaving a rapid heating furnace 6 by at least one of soaking and cooling. Further, the soaking/cooling furnace 7 is configured to enable a change of the ratio in the furnace of the soaking region 15 for soaking steel plate I by soaking means 21 at a soaking temperature of 500° C. to 650° C. and the cooling region 16 for cooling the steel plate I by spray nozzles 22 by a 5° C./sec or more average cooling rate.

Abstract: The present invention provides a highly corrosion-resistant plated steel sheet that can achieve excellent surface smoothness and formability and, according to the process of the present invention, a hot-dip galvanized steel product excellent in surface smoothness and formability having on the steel product surface a zinc alloy plating layer composed of 4 to 22% by mass of Al, 1 to 5% by mass of Mg, 0.000001 to 0.1% by mass of Ti, 0.000001 to 0.5% by mass of Si and the balance of Zn and unavoidable impurities, the plating layer of the plated steel product having a metal structure in which an [Mg2Si phase], an [Al phase], a [Zn2Mg phase] and a [Zn phase] are present in a mixture in the matrix of an [Al/Zn/Zn2Mg ternary eutectic structure], and the plating layer containing a Ti—Al base intermetallic compound in the [Al phase] and/or the [Zn2Mg phase] and/or the [Zn phase], is produced.

Abstract: The present invention provides a highly corrosion-resistant plated steel sheet that can achieve excellent surface smoothness and formability and, according to the process of the present invention, a hot-dip galvanized steel product excellent in surface smoothness and formability having on the steel product surface a zinc alloy plating layer composed of 4 to 22% by mass of Al, 1 to 5% by mass of Mg, 0.000001 to 0.1% by mass of Ti, 0.000001 to 0.5% by mass of Si and the balance of Zn and unavoidable impurities, the plating layer of the plated steel product having a metal structure in which an [Mg2Si phase], an [Al phase], a [Zn2Mg phase] and a [Zn phase] are present in a mixture in the matrix of an [Al/Zn/Zn2Mg ternary eutectic structure], and the plating layer containing a Ti—Al base intermetallic compound in the [Al phase] and/or the [Zn2Mg phase] and/or the [Zn phase], is produced.