A high temperature resistant acid chloride ion corrosion steel plate and its manufacturing method

A chloride ion corrosion and manufacturing method technology, applied in the field of marine steel plates, can solve the problems of increasing the danger of crude oil leakage, low safety and high cost

Active Publication Date: 2017-06-27
CENT IRON & STEEL RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a high temperature acid chloride ion corrosion resistant steel plate and its manufacturing method, to solve the problem of the high cost of the existing marine acid chloride ion corrosion resistant steel plate and the high temperature acid chloride ion corrosion resistance of the marine inner bottom plate. The problem of low service life and low safety in corrosive media increases the risk of crude oil leakage during use

Method used

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  • A high temperature resistant acid chloride ion corrosion steel plate and its manufacturing method
  • A high temperature resistant acid chloride ion corrosion steel plate and its manufacturing method
  • A high temperature resistant acid chloride ion corrosion steel plate and its manufacturing method

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Embodiment 1

[0082]Corrosion experiments were carried out on the above five steels using the test method "Guidelines for the Inspection of Corrosion-Resistant Steels for Cargo Oil Tanks of Crude Oil Tankers" stipulated by China Classification Society. The sampling position is the surface of the steel plate, the sample size is (25±1)×(60±1)×(5±0.5) mm, and there are 5 parallel samples. All samples were ground to 600# with sandpaper, then cleaned with alcohol and acetone, dried, weighed, and measured the actual size of the samples. Hang the sample with a nylon thread on the figure 1 In the beaker shown, the mouth of the beaker is sealed with plastic wrap, and the composition of the corrosion solution is 10% NaCl aqueous solution, pH=0.85, calibrated with HCl, and the solution is replaced every 24 hours to reduce the change of pH value. The temperature of the solution was controlled by a constant temperature water bath to 30°C. The immersion period of the sample is 72h. After the test, the ...

Embodiment 2

[0088] Based on the test method in Example 1 above, the temperature of the test solution was controlled at 30°C, 35°C, 40°C, 45°C, and 50°C, respectively, to investigate the corrosion of five steels at different test temperatures. After the test was completed, the average corrosion rate (C.R.) of the steel was calculated according to the corrosion rate calculation formula in Example 1. The test results are shown in Table 4. It can be seen from the results that the corrosion rate of the comparative example steel increases greatly with the increase of the test temperature, while the corrosion rate of the inventive example changes little with the increase of the temperature, even when the test temperature is 50 ° C, only a small amount Pitting corrosion, exhibiting excellent high temperature corrosion resistance.

[0089] Table 4. Corrosion test data at different test temperatures

[0090]

Embodiment 3

[0092] In order to simulate the steel surface in high concentration Cl - , Expansion behavior of localized corrosion in high acidity environment. For the steel grades of the above-mentioned comparative example and the invention example, a square sample of 50mm (length) × 25mm (width) × 8mm (thickness) was cut, and each surface of the sample was polished to 600#, and after cleaning with alcohol and acetone, the sample One of the 50mm×25mm surfaces is tested, and the other non-test surfaces are sealed with epoxy resin. During the test, the sample is in accordance with the attached figure 2 The method in the method is placed at the bottom of the reaction vessel, a certain amount of 10% NaCl aqueous solution is injected into the vessel 5, the pH value is 0.85, and HCl is used for proofreading, and the water temperature in the constant temperature water bath 6 is set to 40 ° C, and in the conduit In 1, the following two gases are mixed in 1:1 (in volume percentage): A gas: 8% O ...

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Abstract

The invention relates to a high temperature acid chloride ion corrosion resistant steel plate and a manufacturing method thereof, wherein the high temperature acid chloride ion corrosion resistant steel plate contains: in mass percentage: C: 0.01-0.3%, Si: 0.02-2.0%, Mn: 0.1-2.0%, S≦0.01%, P:≦0.05%, Al: 0.01-0.1%, Ni: 0.05-2.0%, Cu: 0.05-2.0%, Cr: 0.005-1.0%, Sn: 0.05-0.3% , Se: 0.0005-0.3%, Ti: 0.005-0.2%, V: 0.01-0.1%, Nb: 0.003-0.3%, and the rest are Fe and unavoidable impurities. The invention has excellent resistance to high-temperature acid chloride ion corrosion performance, and at the same time, its corrosion resistance performance changes little with the temperature of the corrosion medium, can prolong service life and improve safety, and reduce oil leakage accidents.

Description

technical field [0001] The invention relates to the technical field of steel plates for ships, in particular to a high-temperature acid chloride ion corrosion-resistant steel plate and a manufacturing method thereof. Background technique [0002] In recent years, a large amount of crude oil has been imported to a certain extent to solve the consumption demand of China's crude oil resources. However, imported high-sulfur and high-acid crude oil has caused serious corrosion to crude oil storage and transportation equipment. The corrosion problem has brought many potential safety hazards, and it is also one of the focuses of people's attention in recent years. The cargo oil tank of a crude oil tanker is the main structure carrying crude oil, and the protection of the bottom plate is the key to preventing crude oil leakage. In recent years, some studies have found that in the cargo oil tanks of actual large oil tankers, serious pitting corrosion occurs on the inner bottom plate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/60C21D8/02
Inventor 罗小兵柴锋苏航杨才福薛东妹李丽梁丰瑞陈雪慧侯雅青
Owner CENT IRON & STEEL RES INST
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