Corrosion resistance excellent steel for ship

A corrosion-resistant technology for ships, which is applied in the field of steel materials for ships, can solve the problems of insufficient corrosion resistance, shortened service life, and can not be said to be very good, and achieve the effects of excellent corrosion resistance, improved durability, and excellent durability

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

[0006] However, the corrosion resistance in a more severe corrosive environment is still not very good, and further improvement in corrosion resistance is required.
In particular, the corrosion (that is, crevice corrosion) on the part of the "crack" formed at the contact part between the foreign matter and the steel material, the structural reason or the damaged part of the anti-corrosion coating film is remarkable, and the life is sometimes shortened, but in the past In the proposed technique, the corrosion resistance on such parts is insufficient

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

[0057] Steel materials with the chemical compositions shown in Tables 1 to 3 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.

[0058] 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 ho...

Embodiment 2

[0071] Steel materials having the chemical compositions shown in Table 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 D' having a size of 300×150×25 (mm) was produced. Using welding consumables with the chemical compositions shown in Table 9, the hidden arc welding was carried out, and the joint test piece D ( Figure 4 ). 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.

[0072] In addition, two small test pieces of 60 x 60 x 5 (mm) were brought into contact with the welded portion of the test piece D to prepare a test piece E ( Figure 5 ). 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 finish is also the same a...

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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 electrolytic 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. The corrosion resistant steel for shipbuilding has a composition comprising 0.01 to 0.30% C, 0.01 to 1.50% Si, 0.01 to 2.0% Mn and 0.005 to 0.10% Al, and further comprising 0.01 to 5.00% Co and 0.0005 to 0.020% Mg, 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 a ship with excellent corrosion resistance in environments exposed to salt in seawater and constant temperature and high humidity steel. 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.) are often subject to 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 means include (a) painting or (b) electrical corrosion protection. [0003] Among them, in the painting represented by multi-pass painting, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/10C22C38/12
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安永龙哉
Owner KOBE STEEL LTD
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