Marine steel material superior in corrosion resistance

A corrosion-resistant technology for ships, which is applied to ships and other directions, can solve the problems of reduced lifespan, insufficient corrosion resistance, and cannot be said to be sufficient, and achieve the effect of improving corrosion resistance

Inactive Publication Date: 2007-01-31
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for better performance on sea water compared to traditional methods like painting or applying protective coatings. By adding specific amounts (Al+Cr) together, it becomes possible to create strong yet resistant structures that will last longer than previously needed when exposed during harsh conditions over an extended period of time. These new types also provide improved long term rust prevention capabilities against seawater salt damage caused by electric current flow through pipes connecting different parts of the vessel's subsystems.

Problems solved by technology

This patents discuss different ways how coatings on metal structures like boats should protect against damage caused from environmental factors like salty waters and moist environments during use. There have been proposals involving adding layers made of special alloys called antirustants onto these surfaces before applying paint instead of preventing rust formation. Additionally, the problem addressed in those inventions involves increasing the durability of the structure's surface through appropriate control over its properties.

Method used

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  • Marine steel material superior in corrosion resistance
  • Marine steel material superior in corrosion resistance
  • Marine steel material superior in corrosion resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063]Steel materials with the chemical compositions shown in Tables 1 to 3 below were melted in a converter, and produced into various steel plates by continuous casting and hot rolling. The obtained steel plate was cut and surface ground, and finally a test piece (test piece A) having a size of 100×100×25 (mm) was produced. The appearance of test piece A is as follows: figure 1 shown.

[0064]

[0065] Also, if figure 2 As shown, four small test pieces of 20×20×5 (mm) were contacted with a large test piece of 100×100×25 (mm) (the same as the above-mentioned test piece A) to make a test piece with a crack. Test piece B. The small test piece and the large test piece in which the cracks were formed were steel materials having the same chemical composition, and the surface was ground in the same manner as in the above-mentioned test piece A. Next, a small hole of φ5mm was opened in the center of the small test piece, and a screw hole was opened on the base material side (...

Embodiment 2

[0083] Steel materials with chemical compositions shown in Table 8 below were melted in a converter, and various steel plates were produced by continuous casting and hot rolling. Cutting and surface grinding were performed on the obtained steel plate, and finally a test piece D' having a size of 300×150×25 (mm) was fabricated. Submerged arc welding was performed using welding consumables with the chemical compositions shown in Table 9, and the joint test piece D ( Figure 4 ). In addition, all welding materials have a wire diameter of 4.8 mm and a V-shaped groove. The heat input is suitably adjusted from 1 to 10KJ / mm.

[0084] In addition, two small test pieces of 60 x 60 x 5 (mm) were connected to each other on the welded portion of the test piece D to form a test piece E ( Figure 5 ). The chemical composition of the small test piece for forming the cracks was the same as that of the base material of the test piece D, and the surface was ground in the same manner as the ...

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Abstract

The invention provides a marine steel material having superior corrosion resistance, which can be practically used even without being painted or electrolytically protected, particularly, a marine steel material showing superior durability to crevice corrosion, in damp air atmosphere such as in an upper part inside a ballast tank, at which electrolytic protection does not work, and on an upper deck of a crude oil tank. The marine steel material comprises each of 0.01-0.20% C, 0.01-0.50% Si, 0.01-2.0% Mn, 0.05-0.50% Al, 0.01-5.0% Cu and 0.01-5.0% Cr, further each of P controlled to 0.020% or less (including 0%) and S controlled to 0.010% or less (including 0%), and the balance Fe with unavoidable impurities.

Description

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Claims

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Application Information

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Owner KOBE STEEL LTD
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