Steel plates for cargo hold of coal/ore carrier

A technology for transporting ships and ores, applied in the direction of metal rolling, etc., can solve problems that have not yet been established, achieve good collision safety, prevent rolling cracks, and reduce water seepage

Active Publication Date: 2020-08-18
NIPPON STEEL CORP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0015] In view of the above, in the case of high-strength and high-ductility thick plate steel plates for cargo holds of coal / ore carriers, for example, strength and ductility that can suppress cracks in the side of the ship when the ship collides have not yet been established. Technology related to steel plates for cargo tanks of coal / ore carriers with corrosion resistance

Method used

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  • Steel plates for cargo hold of coal/ore carrier
  • Steel plates for cargo hold of coal/ore carrier
  • Steel plates for cargo hold of coal/ore carrier

Examples

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Embodiment

[0149] Hereinafter, examples of the present invention will be described with reference to Tables 1-4.

[0150] Steel sheets having a thickness of 6 to 40 mm were trial-manufactured under the production conditions of Tables 2 and 3 using steel slabs having the chemical components shown in Table 1. In addition, the amount of dissolved oxygen before Ca, Mg, and REM in Tables 2 and 3 means before adding one or more of Ca, Mg, and REM. dissolved oxygen through the use of ZrO 2 (MgO) solid electrolyte oxygen concentration cell oxygen probe inserted into molten steel to measure. The reflow time is the time from the addition of Al as a deoxidizer to the addition of Ca, Mg, and REM. The reduction during casting is the reduction (mm / m) when the central solidification rate is 0.2 to 0.7. Ar 3 Calculated from formula (1), T rex It can be obtained from formula (2), and [Sol.Nb] can be obtained from formula (3). The cooling rate (° C. / sec) in the cooling condition column is the cooling ...

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Abstract

A steel sheet for coal / ore carrier holds that is a ferrite-pearlite steel sheet of specified components, wherein: the microstructure is a structure configured with the ferrite area fraction in the ¼ thickness region being 80-95% and the pearlite area fraction at the ¼ thickness region being 5-20%, the average aspect ratio of the ferrite grains in the ¼ thickness region being 1.0-1.5, the average grain size of the ferrite grains in the ¼ thickness region being 5-20 µm, and the average dislocation density in the ferrite in the ¼ thickness region being 7×1012 / m2 or less; in a 1 mm pitch Vickers hardness test, the average Vickers hardness from the steel sheet surface to the ¼ thickness region or from the ¾ thickness region to the back surface is 80-105% of the average Vickers hardness from the ¼ thickness region to the ¾ thickness region; and the maximum Sn concentration in the ½ thickness (sheet thickness) ± 10% range in the sheet thickness direction is 0.01-5.0%.

Description

technical field [0001] The invention relates to a steel plate for the cargo hold of a coal / ore carrier. For example, it relates to a steel plate for a cargo hold of a coal / ore carrier capable of suppressing cracks in the ship's side of the ship and the like having a plate thickness of 5 mm or more even in the event of a ship collision. Background technique [0002] In recent years, in the recent shipbuilding field, research has been carried out on the following technologies: even if the ship collides with each other, the damage (crack) is kept to a minimum, and the damage such as water seepage from the damaged part is minimized, and it is used to protect the ship. Human life, cargo. [0003] Among them, as an effort from the aspect of steel materials for ship hulls, it has been proposed that the steel materials themselves absorb a large amount of energy at the time of collision to suppress ship hull damage. [0004] For example, Patent Document 1 proposes a technique of ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00B21B1/38B22D11/128C21C7/04C21C7/06C21C7/10C21D8/02C22C38/58
CPCB21B1/38B22D11/128C21C7/04C21C7/06C21C7/10C21D8/02C22C38/00C22C38/58C21D8/0205
Inventor 市川和利鹿岛和幸金子道郎柳田和寿大川铁平
Owner NIPPON STEEL CORP
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