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Corrosion resistance excellent steel for ship

A corrosion-resistant technology for ships, applied in the field of steel for ships, to achieve excellent durability, improved durability, and excellent corrosion resistance

Inactive Publication Date: 2006-01-04
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even such steel materials cannot be said to have corrosion resistance that satisfies the level required in recent years.

Method used

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  • Corrosion resistance excellent steel for ship
  • Corrosion resistance excellent steel for ship
  • Corrosion resistance excellent steel for ship

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Steel materials with the chemical compositions shown in Tables 1 and 2 below were smelted in a converter, and various steel plates were produced by continuous casting and hot rolling. The obtained steel plate was cut, the surface was ground, and finally a test piece (test piece A) having a size of 100×100×25 (mm) was prepared. figure 1 The external appearance shape of the test piece A is shown.

[0065] In addition, if figure 2 As shown, four small test pieces of 20×20×5 (mm) were brought into contact with a large test piece of 100×100×25 (mm) (the same as the above-mentioned test piece A), and a test piece B in which a crack was formed was produced. . The small test piece and the large test piece for crack formation are steel materials with the same chemical composition, and the surface finish is the same as that of the above-mentioned test piece A, which is defined as surface grinding. Then, a hole of Φ5 mm was made in the center of the small test piece, a screw h...

Embodiment 2

[0080] Steel materials with the chemical compositions shown in Tables 6 to 8 below were smelted in a converter, and various steel plates were produced by continuous casting and hot rolling. The obtained steel plate was cut, the surface was ground, and finally a test piece (test piece D) having a size of 300×300×25 (mm) was produced. Figure 4 The external appearance shape of the test piece D is shown.

[0081] In addition, if Figure 5 As shown, four small test pieces of 60 x 60 x 5 (mm) were brought into contact with a large test piece of 300 x 300 x 25 (mm) (the same as the above test piece D), and a test piece E with a crack was produced. . The small test piece and the large test piece for crack formation are steel materials with the same chemical composition, and the surface finishing is also the same as that of the above-mentioned test piece D, which is specified as surface grinding. Then, a hole of Φ10 mm was drilled in the center of the small test piece, a screw hole...

Embodiment 3

[0097] Steel materials having the chemical compositions shown in Table 13 below were smelted in a converter, and various steel plates were produced by continuous casting and hot rolling. The obtained steel plate was cut, the surface was ground, and finally a test piece G' having a size of 300×150×25 (mm) was produced. Subcede arc welding was carried out using welding consumables with the chemical composition shown in Table 14, and the joint test piece G ( Figure 7 ). In addition, the wire diameter of all welding materials is 4.8 mm, and the groove shape is V-shaped. The input heat is properly adjusted within the range of 1-10kJ / mm.

[0098] In addition, two small test pieces of 60 x 60 x 5 (mm) were brought into contact with the welded portion of test piece G to make contact with test piece H forming a crack ( Figure 8 ). The chemical composition of the small test piece for crack formation is the same as that of the base material of test piece D, and the surface finishin...

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Abstract

To provide steel for shipbuilding having excellent corrosion resistance which can be put to practical use even without applying coating and electrical protection, particularly steel for shipbuilding in which the improvement of durability to crevice corrosion can be attained, and which exhibits excellent durability even to corrosion owing to the sticking of salt caused by seawater and owing to a wetting environment, and further can exhibit excellent corrosion resistance even when applied to a petroleum based liquid fuel tank. The corrosion resistant steel for shipbuilding has a composition comprising 0.01 to 0.30% C, 0.01 to 2.0% Si, 0.01 to 2.0% Mn and 0.005 to 0.10% Al, and further comprising 0.005 to 0.50% Se, and the balance Fe with inevitable impurities.

Description

technical field [0001] The present invention relates to a corrosion-resistant steel for ships used as a main structural material in ships such as oil tankers, cargo ships, passenger ships, and warships, and more particularly to steels that are excellent in corrosion resistance when exposed to salt in seawater and in environments with constant temperature and humidity, and A steel material for ships that is also excellent in corrosion resistance required as a material for petroleum-based liquid fuel tanks. Background technique [0002] In each of the above-mentioned ships, steel materials used as main structural materials (for example, outer plates, ballast tanks, oil tanks, etc.) suffer from corrosion damage due to exposure to salt in seawater and constant temperature and humidity. Such corrosion may cause marine accidents such as flooding or sinking, so it is necessary to implement certain anti-corrosion measures for steel materials. Conventionally known anticorrosion mean...

Claims

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Application Information

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IPC IPC(8): C22C38/06C22C38/18C22C38/22C22C38/26
Inventor 阪下真司汤濑文雄久本淳大垣诚一冈野重雄小林洋一郎
Owner KOBE STEEL LTD
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