GB/T 43606-2023Corrosion test method of corrosion resistant steel for cargo oil tanks (English PDF)

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

GB/T 622

GB/T 629

GB/T 1266

GB/T 6682

GB/T 9258

GB/T 10123

GB/T 16545-2015

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