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High-strength steel sheet and high-strength hot-dip galvanized steel sheet and their manufacturing method

A technology for high-strength steel sheets and hot-dip galvanized steel sheets, applied in chemical instruments and methods, manufacturing tools, hot-dip plating processes, etc., to achieve excellent chemical conversion treatment, excellent coating peel resistance and workability, and excellent chemical conversion treatment. sexual effect

Active Publication Date: 2017-06-23
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, it is difficult to perform such control, and the CGL equipped with a full-radiant tube type heating furnace in the annealing furnace cannot use a high-strength steel plate containing Si and Mn as a base material to produce a high-strength steel plate that is resistant to high processing. Hot-dip galvanized steel sheet with excellent coating peeling properties

Method used

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  • High-strength steel sheet and high-strength hot-dip galvanized steel sheet and their manufacturing method
  • High-strength steel sheet and high-strength hot-dip galvanized steel sheet and their manufacturing method
  • High-strength steel sheet and high-strength hot-dip galvanized steel sheet and their manufacturing method

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Experimental program
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Effect test

Embodiment 1

[0114] Hereinafter, the high-strength steel sheet of the present invention will be specifically described based on examples.

[0115] Hot-rolled steel sheets having the steel compositions shown in Table 1 were pickled to remove black scale, and then cold-rolled under the conditions shown in Tables 2 and 3 to obtain cold-rolled steel sheets with a thickness of 1.0 mm. In addition, some steel sheets were not subjected to cold rolling, and hot-rolled steel sheets (thickness 2.0 mm) from which black scale was removed were prepared.

[0116]

[0117] Next, the cold-rolled steel sheet and the hot-rolled steel sheet obtained above were placed in a continuous annealing facility equipped with an annealing furnace capable of oxidizing Fe by controlling the air ratio and oxygen concentration in the heating zone. In the continuous annealing equipment, the dew point in the annealing furnace is controlled and the plate is passed through. In the heating zone, Fe is oxidized and O is attac...

Embodiment 2

[0144] Hereinafter, the high-strength galvanized steel sheet of the present invention will be specifically described based on examples.

[0145] The hot-rolled steel sheet having the steel composition shown in Table 1 above was pickled to remove black scale, and then cold-rolled under the conditions shown in Table 4 and Table 5 to obtain a cold-rolled steel sheet with a thickness of 1.0 mm. .

[0146] Next, the cold-rolled steel sheet obtained above was placed in a CGL of an annealing furnace equipped with an atmosphere capable of oxidizing Fe by controlling the air ratio and oxygen concentration in the heating zone. In CGL, the dew point in the annealing furnace is controlled and the plate is passed through, Fe is oxidized in the heating zone, and after the deposition amount of O shown in Table 4 and Table 5 is present, the temperature of the steel plate is raised to the value shown in Table 4 and Table 5. After the steel sheet is annealed at the highest temperature, hot-dip...

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Abstract

The present invention provides a high-strength steel sheet having excellent chemical conversion treatability and corrosion resistance after electrodeposition coating even when the content of Si and Mn is large, and a method for producing the same. In addition, the present invention provides a method for producing a high-strength galvanized steel sheet excellent in coating appearance, corrosion resistance, coating peeling resistance during advanced processing, and workability, and a high-strength hot-dip galvanized steel sheet. In % by mass, C: 0.03 to 0.35%, Si: 0.01 to 0.50%, Mn: 3.6 to 8.0%, Al: 0.01 to 1.0%, P≤0.10%, S≤0.010%, and the balance consists of Fe and When continuous annealing of steel sheets composed of unavoidable impurities is carried out, 0.08 to 1.50 g / m2 of Fe-based oxides are adhered to the surface of the steel sheet in terms of O amount per single side, and then the maximum temperature of the steel sheets in the annealing furnace is 600 g / m2. The steel sheet is annealed at a temperature higher than or equal to 750°C. Alternatively, a hot-dip galvanizing treatment for forming a zinc-plated layer having a coating adhesion amount per single surface of 20 to 120 g / m 2 is further performed.

Description

technical field [0001] The present invention relates to a high-strength steel sheet having excellent chemical conversion treatability and corrosion resistance after electrodeposition coating even when the Si and Mn contents are large, and a method for producing the same. In addition, the present invention relates to a method for producing a high-strength hot-dip galvanized steel sheet that uses a high-strength steel sheet containing Si and Mn as a base material, and is excellent in coating appearance, corrosion resistance, coating peeling resistance during high-level processing, and workability, as well as high-strength galvanized steel sheets. Strength hot-dip galvanized steel. Background technique [0002] In recent years, from the viewpoint of improving the fuel efficiency of automobiles and improving the collision safety of automobiles, there has been an increasing demand for reducing the weight and increasing the strength of the vehicle body itself by increasing the str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/02C21D9/46C22C38/00C22C38/06C22C38/58C23C2/06C23C2/28C23C2/40C22C18/00
CPCC21D9/46C22C18/00C22C38/00C22C38/06C22C38/58C23C2/02C23C2/06C23C2/28C23C2/40C23C2/024C23C2/0222B32B15/013C22C18/04C22C38/02C22C38/04C22C38/12C22C38/14C21D8/0273C21D8/0278C21D9/56C21D1/26C22C38/60C25F1/06
Inventor 伏胁祐介川崎由康长泷康伸
Owner JFE STEEL CORP
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