Thick steel board

A technology of thick steel plate and display plate, which is applied in the field of thick steel plate and can solve the problems that the characteristics cannot be fully satisfied

Inactive Publication Date: 2010-03-10
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there are also examples in which the fracture transition temperature vTrs exceeds 0

Method used

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Examples

Experimental program
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Effect test

experiment example 1

[0205] Experimental example 1 (experimental example of the steel plate of the first invention)

[0206] By the usual smelting method, various molten steels with the chemical composition shown in the following Tables 1 and 2 are smelted, and after cooling the molten steel to form a slab, hot rolling and rolling are carried out under the conditions shown in the following Tables 3 and 4. After cooling, various steel plates (thickness: 60mm) were obtained. In addition, in Table 1 below, REM is added in the form of a mischmetal containing about 50% of La and about 25% of Ce. In addition, "-" in the following Tables 1 and 2 indicates that no element was added.

[0207]

[0208]

[0209] 【table 3】

[0210]

[0211] 【Table 4】

[0212]

[0213] For each of the obtained steel sheets, the base metal structure (hardness of pseudo-polygonal ferrite, average area ratio), solid solution B amount, mechanical properties (tensile properties of the base metal, impact properties of...

experiment example 2

[0234] Experimental example 2 (experimental example of the steel plate of the second invention)

[0235] By the usual smelting method, smelting various molten steels with the chemical composition shown in the following Tables 7 and 8, after cooling the molten steel to form a slab, hot rolling and rolling are carried out under the conditions shown in the following Tables 9 and 10. After cooling, various steel plates (thickness: 60mm) were obtained. In addition, in the following Tables 7 and 8, REM is added in the form of misch metal containing about 50% of La and about 25% of Ce. In addition, "-" in the following Tables 7 and 8 indicates that no element was added. Also in Tables 7 and 8, the value of [1000×([Ca]+2×[S]+3×[O])] (hereinafter referred to as “A” value) is also displayed at the same time.

[0236]

[0237]

[0238]

[0239]

[0240] For each of the obtained steel plates, the hardness of the pseudo-polygonal ferrite, the average area ratio, the amount of...

experiment example 3

[0250] Experimental example 3 (experimental example of the steel plate of the third invention)

[0251] By the usual smelting method, various molten steels having the chemical composition shown in the following Tables 13 and 14 are smelted, and after cooling the molten steel to form a slab, hot rolling and rolling are carried out under the conditions shown in the following Tables 15 and 16. After cooling, various steel plates (thickness: 60 mm) were obtained. In addition, in the following Table 13, REM is added in the form of misch metal containing about 50% of La and about 25% of Ce. In addition, "-" in the following Tables 13 and 14 indicates that no element was added.

[0252]

[0253]

[0254]

[0255]

[0256]For each of the obtained steel plates, the hardness of the pseudo-polygonal ferrite, the average area ratio, the amount of solid solution B, and the mechanical properties (tensile properties of the base material, impact properties of the base material) w...

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Abstract

The invention provides a thick steel board excellent in brittle crack propagation-arresting property without causing increase in production cost. Even if the thickness of the steel board exceeds 50mm,the board still meets the requirement of high strength (tensile strength is over 490MPa), and Kca value under the temperature of -10 DEG C. is over 3500N/mm[3/2]. By appropriately modulating composition of chemical components, the thick steel board has an average area ratio of the quasi-polygonal ferrite of 30-85% in the microscopic constitution at the position t/4-t/2 deep from the surface, wherein t represents the thickness of the board.

Description

technical field [0001] The present invention relates to a thick steel plate mainly used as a raw material for structural materials of ships and bridges, and in particular to a thick steel plate with an improved property of stopping the propagation of brittle cracks that have already occurred (arrest property) . Background technique [0002] In heavy steel plates used in structures such as ships, buildings, oil tanks, marine structures, and line pipes, in order to suppress brittle failure of structures, it is required to have suppression characteristics (hereinafter referred to as "brittle crack propagation stop characteristics") ), which is the ability to suppress damage due to propagation of brittle cracks. In recent years, along with the enlargement of structures, high-strength thick steel plates with a yield stress of 390 MPa or more and a plate thickness of 50 mm or more are frequently used. However, it is generally difficult to ensure the above-mentioned brittle crack...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C38/16C22C38/58C22C38/52C22C38/50C22C38/38C22C38/30C22C38/28
Inventor 高冈宏行田村荣一冈崎喜臣
Owner KOBE STEEL LTD
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