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Corrosion test method of corrosion resistant steel for cargo oil tanks
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Basic data
| Standard ID | GB/T 43606-2023 (GB/T43606-2023) |
| Description (Translated English) | Corrosion test method of corrosion resistant steel for cargo oil tanks |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | H25 |
| Classification of International Standard | 77.060 |
| Word Count Estimation | 18,176 |
| Date of Issue | 2023-12-28 |
| Date of Implementation | 2024-07-01 |
| Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration |
GB/T 43606-2023: Corrosion test method of corrosion resistant steel for cargo oil tanks
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 77:060
CCSH25
National Standards of People's Republic of China
Corrosion of corrosion-resistant steel for cargo tanks of crude oil tankers
Performance testing methods
Published on 2023-12-28
2024-07-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration Committee
Foreword
This document complies with the provisions of GB/T 1:1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents"
Drafting:
Please note that some content in this document may be subject to patents: The publisher of this document assumes no responsibility for identifying patents:
This document is proposed by the China Iron and Steel Industry Association:
This document is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183):
This document was drafted by: Luoyang Ship Materials Research Institute (No: 725 Research Institute of China State Shipbuilding Corporation), Metallurgical Industry Information Standard
Quasi Research Institute, Qingdao Gangyan Nak Detection and Protection Technology Co:, Ltd:, Guangxi Institute of Industrial Research New Functional Materials Research Institute Co:, Ltd:, Xiamen Shuangrui
Materials Research Institute Co:, Ltd:, Guangxi Academy of Sciences, CNNC Nuclear Power Operation Management Co:, Ltd:, University of Science and Technology Beijing:
The main drafters of this document: Zha Xiaoqin, Luo Xianfu, Li Qian, Hou Jie, Liu Kaiji, Pan Kai, Zhang Xinyao, Zhao Maomi, Liu Xiaoyong, Zhang Bo,
Qin Yiming, Wu Zhenyu, Shang Xianhe, Dong Chaofang, Chen Pei, Tian Zijian, Guo Jiawen, Chen Jiaxin, Hu Minglei, Sun Xulu, Sun Menghan, Zhang Wei:
Corrosion of corrosion-resistant steel for cargo tanks of crude oil tankers
Performance testing methods
1 Scope
This document specifies the sampling, sample preparation, and simulation for testing the corrosion resistance of corrosion-resistant steel and its welded joints used in cargo oil tanks of crude oil tankers:
Test equipment for plate working conditions and simulated inner floor working conditions, test conditions, test steps, test results and evaluation, and test reports:
This document is applicable to the corrosion performance testing of corrosion-resistant steel and its welded joints used in cargo tanks of crude oil tankers:
Note: Corrosion-resistant steel and welded joints used in crude oil tankers’ cargo tanks refer to upper deck corrosion-resistant steel, inner bottom plate corrosion-resistant steel and welded joints used in crude oil tankers’ cargo tanks:
2 Normative reference documents
The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, the dated quotations
For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to
this document:
GB/T 622 Chemical reagent hydrochloric acid
GB/T 629 Chemical reagent sodium hydroxide
GB/T 1266 Chemical reagent sodium chloride
GB/T 6682 Specifications and test methods for water used in analytical laboratories
GB/T 9258:3 Particle size analysis of abrasives for coated abrasive tools Part 3: Determination of particle size composition of micropowder P240~P2500
GB/T 10123 Corrosion terminology for metals and alloys
GB/T 16545-2015 Corrosion of metals and alloys Removal of corrosion products from corrosion specimens
3 Terms and definitions
The terms and definitions defined in GB/T 10123 and the following apply to this document:
3:1
corrosion losscorrosionloss
The average corrosion thinning of the sample calculated based on the corrosion weight loss of the sample, the surface area of the sample and the material density:
4 Overview and requirements
4:1 Overview
4:1:1 The cargo tank of a crude oil tanker includes upper deck, longitudinal bulkhead and inner bottom plate: The top space of the cargo oil tank will form a complex corrosive environment, including
Including H2O and H2S volatilized from crude oil, as well as gases containing components such as N2, O2, SO2 and CO2: The temperature on the upper deck of the cargo oil tank varies with the outside
The boundary temperature changes obviously, and the crude oil loaded in the tank has a huge heat capacity, which makes the temperature of the mixed gas in the tank very stable: Therefore, during the day, inside and outside the cabin
When the temperature difference is small, the lower surface of the upper deck in the cabin is dry: At night, the temperature of the gas in the cabin is high and the temperature outside the cabin is low: Formations containing H2S and
Condensed water containing SO2 and other components is highly corrosive: If the upper deck of the cargo oil tank is in this dry-wet cycle for a long time, the lower surface will corrode:
serious: The longitudinal bulkhead is mainly in contact with crude oil and has slight corrosion: The cargo oil bilge is mainly composed of sedimentary water separated from crude oil, in which a large amount of acid is dissolved
...
