Steel material with excellent corrosion resistance for tank upper deck of crude oil tanker or for hold of bulk carrier

A corrosion-resistant, bulk carrier technology, applied in the field of steel for cabins, can solve problems such as difficulty in ensuring corrosion resistance, and achieve excellent corrosion resistance.

Inactive Publication Date: 2013-01-30
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, even with the technology of this patent document 1, it is still difficult to ensure sufficient corrosion resistance in severe corrosive environments where sulfur-containing substances exist, such as the cabin of a bulk carrier and the backside (crude oil side) of the roof of a crude oil storage tank. Further improvement of corrosion resistance is required

Method used

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  • Steel material with excellent corrosion resistance for tank upper deck of crude oil tanker or for hold of bulk carrier
  • Steel material with excellent corrosion resistance for tank upper deck of crude oil tanker or for hold of bulk carrier
  • Steel material with excellent corrosion resistance for tank upper deck of crude oil tanker or for hold of bulk carrier

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Experimental program
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Effect test

Embodiment

[0064]Hereinafter, the present invention is described in more detail by enumerating the examples. The present invention is certainly not limited by the following examples. Of course, it can also be suitably modified and implemented in the scope of meeting the purpose of the foregoing and the following, and these are all included in the technology of the present invention. In the range.

[0065] [Preparation of test material]

[0066] Steel materials satisfying the composition shown in Tables 1 and 2 (the balance is iron and unavoidable impurities) were smelted in an electric furnace, hot-rolled and heat-treated as needed to obtain steel raw materials with a plate thickness of 10 mm. Then, a test piece (TP) having a size of 30×30×5 (mm) was cut out from the steel raw material. Next, the entire surface of TP was ground to SiC #600 with a wet rotary grinder, washed with water and acetone, dried, and used for the following test.

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Abstract

The invention provides a steel material for a tank upper deck of a crude oil tanker or for a hold of a bulk carrier and the steel material presents excellent corrosion resistance even if exposed an inclement corrosion environment having sulfur-containing materials such as sulfur, sulfoxides and sulfide. Compared with conventional steel materials, the steel material provided by the invention has the sme or higher welding property and heat processing property. The steel material for the tank upper deck of the crude oil tanker is characterized in that the content of C is 0.01-0.30%, Si is 0.20-1.0%, Mn is 0.50-1.60%, P is 0.005-0.040%, S is 0.005-0.020%, Al is 0.050-0.100%, Cu is 0.20-0.10%, Ni is below 0.03%(containing 0%), Cr is 0.05-0.30%, Zn is 0.001-0.05%, Sn is 0.005-0.050% and Ca is 0.0005-0.0050%, and the balance Fe with inevitable impurities.

Description

technical field [0001] The present invention relates to steel materials for tank roofs of oil tankers or cabins of bulk carriers excellent in corrosion resistance. Especially in the presence of hydrogen sulfide, SO 2 / SO 3 Steel materials for tank roofs that exhibit excellent corrosion resistance in severe corrosive environments where corrosive gases such as coal and sulfur contained in coal and oil (hereinafter collectively referred to as "sulfur-containing substances") exist Or the steel for the cabin of bulk carrier. Background technique [0002] In ships for the purpose of transporting crude oil, coal, etc., such as oil tankers and bulk carriers, steel materials used as structural materials and exposed to corrosive environments are generally treated for the purpose of preventing fuel leakage, etc. Some way of anti-corrosion measures. As anti-corrosion measures, (a) anti-corrosion coating and (b) electric anti-corrosion (for example, electric anti-corrosion using a sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/20C22C38/42C22C38/38C22C38/58C22C38/60C22C38/52C22C38/50C22C38/44C22C38/30C22C38/28C22C38/22
CPCC22C38/002C22C38/008C22C38/02C22C38/06C22C38/42C22C38/44C22C38/50C22C38/52C22C38/58C22C38/60
Inventor 小泽敬祐阪下真司谷德孝下山哲史吉田诚司
Owner KOBE STEEL LTD
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