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Corrosion-resistant steel for hold of coal carrying vessel or coal/ore carrying vessel

A corrosion-resistant steel and coal technology, applied in the field of steel, can solve the problems of different anti-corrosion mechanisms and the inability to directly switch to corrosion-resistant steel, etc., and achieve the effect of inhibiting corrosion

Inactive Publication Date: 2014-10-15
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the cabins, ballast tanks, and oil tanks of coal ships and coal / ore ships, due to the different corrosion environments and anti-corrosion mechanisms, it is not possible to directly switch to corrosion-resistant steel for ballast tanks and oil tanks.

Method used

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  • Corrosion-resistant steel for hold of coal carrying vessel or coal/ore carrying vessel
  • Corrosion-resistant steel for hold of coal carrying vessel or coal/ore carrying vessel
  • Corrosion-resistant steel for hold of coal carrying vessel or coal/ore carrying vessel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] First, in order to determine the maximum pitting corrosion depth, the steel sheets shown in Table 1 were used to obtain examples according to the following procedures (this test method is referred to as corrosion test a).

[0092] Cut 5mm from the steel plate with the composition shown in Table 1. t ×50mm W ×75mm L The surface of the test piece is shot blasting to remove the scale and oil content on the surface. Using this surface as a test surface, the corrosion resistance of the steel material after peeling of the coating film was evaluated. After coating the back and end surfaces with a silicon base adhesive tape, it is embedded in an acrylic cell, and 5g coal is spread on it, and passed through a temperature and humidity chamber) for 28 days of temperature and humidity cycle, the temperature and humidity cycle is figure 1 Atmosphere A shown (temperature: 60°C, humidity: 95%, 20 hours) Atmosphere B (temperature: 30°C, humidity: 95%, 3 hours) has a temperature and humid...

Embodiment 2

[0095] Next, an example for estimating the maximum plate thickness reduction after 25 years is shown. As in Example 1, cut 5mm from the steel plate shown in Table 1. t ×50mm W ×75mm L Test piece. The surface of the test piece was sandblasted to remove oxide scale and oil on the surface, and the surface was used as a test surface to evaluate the corrosion resistance of the steel material after peeling of the coating film. After coating the back and end faces with silicone sealant, insert them into acrylic jigs, spread 5g coal on them, and perform temperature and humidity for 28, 56, 84, 168, 336 days with a low temperature, constant temperature and humidity chamber Cycle, the temperature and humidity cycle is figure 1 Atmosphere A shown (temperature: 60°C, humidity: 95%, 20 hours) Atmosphere B (temperature: 30°C, humidity: 95%, 3 hours) has a temperature and humidity cycle with a change time of 0.5 hours (this test method is referred to as corrosion test b).

[0096] It should b...

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Abstract

The purpose of the present invention is to provide a corrosion-resistant steel for a hold of a coal carrying vessel and a coal / ore carrying vessel, which does not undergo corrosion after removal of a coating film therefrom under an environment in which drying and humidification are repeated and the pH value is low. Specifically provided is a corrosion-resistant steel for a hold of a coal carrying vessel or a coal / ore carrying vessel, which is characterized in that a material for the steel has a component composition containing 0.010 to 0.200 mass% of C, 0.05 to 0.50 mass% of Si, 0.10 to 2.0 mass% of Mn, 0.0250 mass% or less of P, 0.010 mass% or less of S, 0.0050 to 0.10 mass% of Al, 0.010 to 0.50 mass% of Sb and 0.0010 to 0.0080 mass% of N, with the remainder being Fe and unavoidable impurities.

Description

Technical field [0001] The present invention relates to steel materials having excellent corrosion resistance that can be used in the hold of a coal carrier or an ore / coal carrier. Background technique [0002] In the early 1990s, marine accidents occurred successively on bulk carriers and became an international problem. In particular, there have been many reports of accidents involving coal ships and coal / iron ore ships, most of which are due to damages in the cabin. It is believed that the problem of bulk carriers is that they are susceptible to corrosive cargoes due to the direct loading of cargoes in the cabins. Due to corrosion in the cabins, especially the shipboards in the cabins of coal ships and coal / iron ore combined ships Pitting corrosion on the side shell results in local strength reduction. There have been reports of cases in which such pitting corrosion has significantly progressed, and cases in which the thickness of the side frame portion to ensure the strengt...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C38/60
CPCC22C38/60C22C38/42C22C38/001C22C38/04C22C38/06C21D6/005C22C38/002C22C38/08C22C38/16C22C38/40C22C38/18C22C38/02C21D2211/004
Inventor 面田真孝钓之郎小森务星野俊幸
Owner JFE STEEL CORP
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