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Study of the Behavior of Stress Corrosion of X80 Steel in Yingtan Soil Environment

Author: WangChengXiang
Tutor: WuMing
School: Liaoning University of Petroleum \u0026 Chemical Technology
Course: Oil and Gas Storage and Transportation Engineering
Keywords: X80 pipeline steel Acidic soil SCC Corrosion mechanism
CLC: TG172
Type: Master's thesis
Year: 2010
Downloads: 103
Quote: 0
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Abstract


In recent years, with a sharp increase in China's demand for energy, oil and gas pipeline construction has been booming. In 2004, China built a total of 45777km of oil and gas pipelines. It is reported that in the next 10 years, China Petroleum will invest 200 billion yuan for the construction of oil and gas pipeline transportation network, the senior pipeline steel of various types of oil and gas is expected to take about 10 million tons. X80 steel abroad has entered the stage of practical application, stabling of X80 pipeline 2000km, X100 and X120 steel also reached the trial stage. 7.9Km of X80 pipeline laying in the West-East workers Cheng Jining Branch, marks the domestic the X80 steel rolling and welding technology has reached the practical stage, the the West second natural gas pipeline now under construction is also used X80 pipeline steel. Not difficult to foresee the localization and the development of the energy delivery system with the X80 pipe line of X80 grade pipeline steel in China's energy pipeline is bound to be more widely used. Therefore, to make the X80 steel and its weld stress corrosion behavior and mechanism of the typical acidic soil (such as western Saline Soil and eastern soil) environment in urgent need to develop the X80 steel oil and gas pipeline in China's large and safe use to solve scientific problems and the necessary protection. This paper by potentiodynamic scanning technology, electrochemical impedance, cyclic voltammetry experiments, slow strain rate tensile tests the hydrogen permeation experiments studied the X80 steel in acidic corrosion medium corrosion process under different conditions, and analyzed according to the experimental results X80 steel corrosion mechanism in acidic corrosive media, various gases and corrosion on the cathode or anode reaction. The electrochemical experiments showed that X80 pipeline steel and welded joints in Yingtan soil simulated solution polarization curves have active dissolution characteristics than the parent metal, the corrosion resistance of the weld. This may be due to weld after welding heat acting, the incorporation of some of the corrosion-resistant alloy elements, so that the enhanced corrosion resistance of the welds. The chronic stress tensile experimental results show that the X80 steel base material and the weld metal of acidic soil simulated solution environment can occur SCC, weld under the same conditions than the base metal is more prone to the SCC. That this article is expected to provide significant insight into the mechanisms of stress corrosion cracking of X80 steel in acidic solution, provide a reliable theoretical basis and data support for X80 steel engineering applications as well as future research work.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Various types of metal corrosion
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