Corrosion resistant steel for cargo oil tanks and application thereof

A technology for corrosion-resistant steel and cargo oil tanks, which is applied to corrosion-resistant steel and corrosion-resistant steel for cargo oil tanks. In the field, it can solve problems such as difficult effects, achieve extended time, reduce repair painting operations, and meet the effects of corrosion resistance requirements

Inactive Publication Date: 2010-12-29
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the severe corrosion environment in the ballast tank, it is difficult to maintain its effect for a long time even with repair painting

Method used

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  • Corrosion resistant steel for cargo oil tanks and application thereof
  • Corrosion resistant steel for cargo oil tanks and application thereof
  • Corrosion resistant steel for cargo oil tanks and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A corrosion-resistant steel for cargo oil tanks according to the present invention, the alloy composition of the steel is shown in Table 1. The experimental samples were wire-cut into rectangular samples of 50mm×30mm×4.5mm to simulate the corrosion test of the backside environment of the actual oil tanker deck. Such as figure 1 as shown, figure 1It is a schematic diagram of the present invention simulating the corrosion environment on the back of the deck of an actual oil tanker. Among them, 1 is a glass container, 2 is a 0.3% NaCl aqueous solution, 3 is a steel sample to be tested, 4 is a ventilation pipe, and 5 is a constant temperature bath. A glass container is used to simulate cargo oil tank, and a part of 0.3% NaCl aqueous solution is injected inside, and there are vent holes on the upper part, one gas supply port and one exhaust port, and the sample is fixed on the upper part of the glass container. Place the sealed glass container in a constant temperature ba...

Embodiment 2

[0046] The experimental material was manufactured according to the alloy composition described in the summary of the invention, and the alloy composition of the material is shown in Table 1. The experimental sample is wire-cut into a rectangular sample of 50mm×30mm×4.5mm to simulate the corrosion test of the steel used in the bottom plate of the cargo oil tank of an actual oil tanker. figure 2 The present invention simulates the schematic diagram of the corrosion environment of the cargo oil tank bottom plate of the actual oil tanker, 11 is a glass container, 12 is an artificial seawater solution, 13 is a steel sample for testing, 14 is a vent pipe, and 15 is a constant temperature tank.

[0047] Use a glass container to simulate a cargo oil tank, inject a part of artificial seawater into it, and leave a vent hole on the upper part, one gas supply port and one exhaust port. The sample is fixed at the bottom of the glass container and immersed in the artificial seawater solutio...

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PUM

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Abstract

The invention discloses corrosion resistant steel for cargo oil tanks and application thereof. The corrosion resistant steel for cargo oil tanks comprises the following chemical components in percentage by weight: 0.01-0.2% of C, 0.05-1.0% of Si, 0.1-2.0% of Mn, being more than or equal to 0.020% of P, being more than or equal to 0.020% of S, 0.1-1.5% of Cu, being more than or equal to 1.0% of Cr, 0.01-1.0% of Ni, being more than or equal to 0.1% of Al, being more than or equal to 0.010% of Ti and the balance of Fe. The corrosion resistant steel also comprises one or more than two of 0.05-1.0% of W, 0.01-0.5% of Mo, 0.05-1.0% of Co, 0.01-0.3% of Sb and 0.01-0.3% of Sn, or one or more than two of 0.01-0.5% of Nb, 0.005-0.1% of V and 0.0005-0.005% of B, or one or two rare-earth elements of being more than or equal to 0.50% of La and being more than or equal to 0.50% of Ce. The corrosion resistant steel is used in a cargo oil tank of a crude oil tanker, and has excellent general corrosion resistance and local corrosion resistance.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and relates to a corrosion-resistant steel, in particular to a corrosion-resistant steel used for cargo oil tanks in crude oil tankers. Background technique [0002] The ballast tanks of ships are injected and discharged with seawater according to changes in the state of loading, etc., so the steel materials used are repeatedly exposed to extremely severe corrosive environments such as the state of immersion in seawater and the humid atmosphere containing salt. In addition, the ballast tanks became very hot due to the sunlight hitting the upper deck. But because the hull is cooled by seawater, there is a temperature gradient, which makes the environment for steel even harsher. On the bottom of crude oil storage tanks, due to the retention of water and sulfur components from crude oil on the bottom of crude oil storage tanks containing high concentrations of chlorides, the steel is subjec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16
Inventor 尹雨群朱爱玲赵晋斌
Owner NANJING IRON & STEEL CO LTD
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