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Steel products, ballast tanks and holds of ships using the same, and ships equipped with such ballast tanks or holds

A ballast tank and steel technology, applied in the steel field, can solve the problems of corrosion, huge maintenance costs, and expenses.

Active Publication Date: 2017-10-24
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the coating film deteriorates, or corrosion occurs and progresses from the thinner coating film such as the edge of the steel material, maintenance such as recoating is necessary when the steel material is used for a long period of time in the structure.
For example, in the case of repainting, it is necessary to install scaffolding according to the structure, so the maintenance cost becomes a huge cost, and a large amount of VOC (volatile organic compounds) harmful to the human body is generated by painting. become a problem

Method used

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  • Steel products, ballast tanks and holds of ships using the same, and ships equipped with such ballast tanks or holds
  • Steel products, ballast tanks and holds of ships using the same, and ships equipped with such ballast tanks or holds
  • Steel products, ballast tanks and holds of ships using the same, and ships equipped with such ballast tanks or holds

Examples

Experimental program
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Embodiment

[0152] 27 kinds of steels were smelted in a vacuum melting furnace to produce 50 kg steel ingots, and then hot forged by a common method to produce steel ingots (steel Nos. 1 to 27) with a thickness of 60 mm. Table 5 shows the chemical compositions of the produced steel ingots.

[0153]

[0154] Next, each of the steel ingots was heated at 1100°C to 1120°C for 1 hour or more as shown in Table 6, and then hot rolled at a finishing temperature of 750°C to 900°C to obtain a steel plate with a thickness of 20 mm. Then, this steel plate was cooled to room temperature under various cooling conditions, and it was set as the steel plate of test No. 1-30. In addition, the cooling start temperature in Table 6 indicates the temperature at which water cooling starts after rolling, the cooling rate 1 is the average cooling rate from the end of rolling to 650°C, and the cooling rate 2 is the average cooling rate from 650°C to 550°C Speed, cooling rate 3 is the average cooling rate at 55...

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Abstract

This steel material contains given chemical components, has a flexible structure and a rigid structure, and has an Sn concentration ratio, which is the ratio of the Sn concentration in the rigid structure to the Sn concentration in the flexible structure, of 1.2 or higher but less than 6.0.

Description

technical field [0001] The present invention relates to a steel material excellent in corrosion resistance used in a corrosive environment including chlorides such as a seawater environment. Moreover, this invention relates to the ballast tank (ballast tank) and the hold of a ship formed using this steel material excellent in corrosion resistance. Moreover, this invention relates to the ship provided with these ballast tanks or holds. Background technique [0002] As a factor accelerating the corrosion of steel materials, it is well known that chlorides have a great influence. In particular, the steel materials used in ballast tanks, outer plates and superstructures of ships, structures such as bridges in coastal areas, sheet piles and pipe piles of harbor facilities, marine structures, and offshore wind power generation equipment, etc., directly Withstands seawater spray and is exposed to repeated wet and dry environments, so it is extremely susceptible to corrosion. Ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D8/02C22C38/04C22C38/60
CPCC21D8/02C22C38/00C22C38/04C22C38/60
Inventor 鹿岛和幸菅江清信上村隆之幸英昭
Owner NIPPON STEEL CORP
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