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High tensile strength hot dip plated steel sheet and method for production thereof

A high tensile strength, hot-dip coating technology, applied in hot-dip coating process, manufacturing tools, heat treatment furnace, etc.

Inactive Publication Date: 2008-03-12
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the problem of non-plated sections in steels with higher Si content cannot be completely prevented in these methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0130] Slabs having various compositions shown in Table 1 were heated to 1200°C and hot rolled at a finish rolling temperature of 850-900°C. Each hot-rolled steel strip was then pickled and cold-rolled at a reduction ratio of 77% to obtain a cold-rolled steel sheet with a thickness of 0.7 mm, which was recrystallized annealed with CAL and CGL under the conditions shown in Table 2- It is further processed in the steps of pickling-heating before electroplating-hot dipping. In addition, as a treatment atmosphere, (7 vol% H 2 +N 2 ), used in pre-plating heating (5 vol% H 2 +N 2 ). In particular, the heating before electroplating in No. 12 is in a combustion atmosphere containing 1 vol% oxygen up to 600 ℃ and above 600 ℃ (10 vol% H 2 +N 2 ) atmosphere.

[0131] ·Galvanizing conditions

[0132] Bath temperature: 470°C

[0133] Inserted steel plate temperature: 470°C

[0134] Al content: 0.14% by weight

[0135] Coating weight: 50g / m 2 (per surface)

[0136] Hot dip plat...

Embodiment 2

[0149]Slabs with various compositions shown in Table 3 were heated to 1200°C and hot-rolled at a finish rolling temperature of 850-900°C to obtain hot-rolled steel sheets with various thicknesses, then pickled, and then compressed The ratio is 50-68% cold rolling to obtain a cold-rolled steel sheet with a thickness of 1.2mm, which is treated under the conditions shown in Table 4 through recrystallization annealing-pickling-heating before electroplating-hot dipping, and described as follows . Particularly in No. 24 (Steel R), the hot-rolled steel sheet (thickness 1.5 mm) was pickled and treated by recrystallization annealing-pickling-heating before plating-hot-dipping without cold rolling.

[0150] In addition, as the treatment atmosphere, recrystallization annealing was used (7vol%H 2 +N 2 ), used for heating before plating (5 vol% H 2 +N 2 ). In particular, the heating before electroplating of No. 25 is in a combustion atmosphere containing 1 volume % oxygen up to 600 ° ...

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Abstract

A method for producing a high tensile strength hot dip plated steel sheet, which comprises providing a steel sheet having a Si content controlled within a specific range and comprising Nb and one or more of Cu, Ni and Mo, subjecting a rolled sheet to a recrystallization annealing to thereby form an inner oxide layer close under the surface of the steel plate, washing the surface with an acid to remove the oxides having been formed also on the surface, heating the resultant steel sheet prior to plating, and then subjecting the sheet to a hot dip plating. The inner oxide layer formed during annealing acts as a barrier against diffusion of Si, Mn and the like during the heat treatment prior to plating, which results in marked reduction of the formation of oxides of Si, Mn and the like. Accordingly, the method can be used for producing a high tensile strength hot dip plated steel sheet which exhibits markedly excellent plating characteristics.

Description

technical field [0001] The present invention relates to a kind of high tensile strength hot-dip galvanized steel plate used for the body of automobiles, etc., the steel plate is made by treating the surface of the high tensile strength steel plate with zinc (including its alloy, the same hereinafter), aluminum, zinc-aluminum alloy, Zinc-aluminum-magnesium alloys are formed by hot-dipping, and the invention also relates to a production method thereof. Background technique [0002] Recently, the use of high tensile strength-hot-dipped steel sheets formed by galvanizing the surface of steel sheets, etc., as steel sheets for automobiles has been increasing, which is due to safety, weight reduction, and low fuel consumption, and thus contributes to environmental protection . [0003] In order to obtain such a high tensile strength hot-dip-plated steel sheet, it is important to use, as the original steel sheet, a steel sheet having excellent plating characteristics and having des...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/46C23C2/02C22C38/48C21D8/02C22C38/04C22C38/12
CPCC23C2/02C22C38/12C22C38/04C21D8/0278Y10T428/12799Y10T428/12757Y10T428/12951C23C2/0222C23C2/024C23C2/0224C22C38/00
Inventor 石井和秀加藤千昭京野一章望月一雄
Owner JFE STEEL CORP
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