Corrosion-resistant flat bulb steel used in cargo oil tank of oil tanker and smelting technology thereof

A cargo oil tank and bulb flat steel technology, applied in the metallurgical field, can solve problems such as difficulty, high maintenance cost, complicated operation procedures, etc., and achieve the effect of prolonging the service life and reducing the maintenance cost.

Active Publication Date: 2015-03-11
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the cargo oil tanks on large oil tankers still use traditional AH32, AH36 and other steel plates with poor corrosion resistance. The corrosion protection measures for these steel structures mainly adopt coatings or corrosion inhibitors for corrosion protection. The service life is generally 10-15a, which does not match the design service period of the hull (generally 25a). The coating is easily damaged during service, and pitting corrosion occurs in acidic solution conditions. The pitting corrosion development speed even exceeds that without coating protection. For bare steel, spot welding repair or coating protection is required every 2.5 years at the defect position, which is costly and difficult to maintain
The use of corrosion inhibitors will significantly reduce the overall corrosion rate of the tank, but the operating procedures are cumbersome, and the cost of protection is several times that of coatings, so it is not suitable for extensive use in tanks of oil tankers

Method used

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  • Corrosion-resistant flat bulb steel used in cargo oil tank of oil tanker and smelting technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Corrosion-resistant steel for cargo oil tanks of oil tankers contains by weight percentage: C: 0.08%, Si: 0.20%, Mn: 1.00%, P: 0.025%, S: 0.003%, Alt: 0.020%, Ni: 0.20%, Cr : 0.10%, Cu: 0.20%, V: 0.03%, Ti: 0.030%, Sb: 0.10%, also contains N: 80ppm, and the rest is Fe and unavoidable impurities.

[0034] Its manufacturing method comprises the following steps:

[0035](1) In the 100t EBT electric arc furnace smelting process, the Cu content is tested before tapping, and according to the analysis results, pure copper alloy is added during the tapping process to adjust the copper content to the design range. The amount of pure copper alloy added refers to 10kg copper Copper 0.01% standard for control;

[0036] (2) In the primary refining process of 100t LF, alloys of appropriate grades (100kg ferrosilicon, 100kg low carbon ferrochrome, 80kg ferrovanadium, 140kg nickel plate, 200kg low carbon ferromanganese, 20kg ferrophosphorus, 150kg nickel copper) will be used in combin...

Embodiment 2

[0041] Corrosion-resistant steel for cargo oil tanks of oil tankers contains by weight percentage: C: 0.10%, Si: 0.30%, Mn: 1.20%, P: 0.015%, S: 0.0025%, Alt: 0.025%, Ni: 0.30%, Cr : 0.15%, Cu: 0.30%, V: 0.05%, Ti: 0.010%, Sb: 0.08%, also contains N: 110ppm, and the rest is Fe and unavoidable impurities.

[0042] Its manufacturing method comprises the following steps:

[0043] (1) In the 100t EBT electric arc furnace smelting process, the Cu content is tested before tapping, and according to the analysis results, pure copper alloy is added during the tapping process to adjust the copper content to the design range. The amount of pure copper alloy added refers to 10kg copper Copper 0.01% standard for control;

[0044] (2) In the primary refining process of 100t LF, alloys of appropriate grades (95kg ferrosilicon, 105kg low carbon ferrochrome, 75kg ferrovanadium, 150kg nickel plate, 210kg low carbon ferromanganese, 18kg ferrophosphorus, 138kg nickel copper) will be used in comb...

Embodiment 3

[0049] Corrosion-resistant steel for cargo oil tanks of oil tankers contains by weight percentage: C: 0.12%, Si: 0.40%, Mn: 1.10%, P: 0.018%, S: 0.002%, Alt: 0.045%, Ni: 0.25%, Cr : 0.20%, Cu: 0.25%, V: 0.04%, Ti: 0.015%, Sb: 0.07%, also contains N: 100ppm, and the rest is Fe and unavoidable impurities.

[0050] Its manufacturing method comprises the following steps:

[0051] (1) In the 100t EBT electric arc furnace smelting process, the Cu content is tested before tapping, and according to the analysis results, pure copper alloy is added during the tapping process to adjust the copper content to the design range. The amount of pure copper alloy added refers to 10kg copper Copper 0.01% standard for control;

[0052] (2) In the primary refining process of 100t LF, alloys of appropriate grades (106kg ferrosilicon, 123kg low carbon ferrochrome, 82kg ferrovanadium, 145kg nickel plate, 195kg low carbon ferromanganese, 19kg ferrophosphorus, 144kg nickel copper) will be used in comb...

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PUM

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Abstract

The invention relates to a corrosion-resistant flat bulb steel used in the cargo oil tank of an oil tanker and a smelting technology thereof. The C, Si, Mn, and Alt contents of the flat bulb steel are all controlled according to the classification society standards, and other elements are strictly controlled in a designed range. The steel can satisfy the classification society requirements, and can be used in the ship-making industry without authentication. The steel can be used in the cargo oil tank of an oil tanker without being painted, has a protective effect and a corrosion-resistant effect, can reduce the maintenance cost, and prolongs the service life of ship body.

Description

technical field [0001] The invention relates to a production process of a variety of steel in the field of metallurgy, in particular to a smelting process of corrosion-resistant bulbous flat steel for cargo oil tanks of oil tankers. Background technique [0002] In recent years, average damage and pollution incidents have occurred frequently during crude oil transportation, which have caused adverse effects on the marine environment and marine resources. In addition, shipowners urgently need to reduce the cost of inspection and maintenance of oil tankers to reduce operating costs. Therefore, the corrosion of oil tanks in oil tankers and security issues have received widespread attention from countries all over the world. [0003] The cargo oil tank is a double-layer structure, the inner layer is the cargo oil tank, and the outer layer is the ballast tank. According to research data, the cargo oil tank top and bottom are in two different corrosion environments, and the top of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C33/04
CPCC22C33/04C22C38/02C22C38/04C22C38/18C22C38/40C22C38/42C22C38/46C22C38/50C22C38/60
Inventor 杨利委朱守欣周剑李凯宋金平
Owner NANJING IRON & STEEL CO LTD
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