Effects of Microstructure on Corrosion of X70 Pipe Steel

1 Effect of Carbon Steel Composition and Microstructure

Figure 11 X70 steel, plane A, B, C microstructures. Figure 12 X70 steel, m icrostructure consists of tempered martensite. X65II This steel contains a very low amount of carbon (0.07 wt% C). As shown in Figure 13, there are significant differences in the microstructure between planes B, C, and plane A.Analysis of the corrosion scales formed on API 5L X70 and Effects of Microstructure on Corrosion of X70 Pipe Steel Longitudinal welded joints samples of X70 and X80 API grade steel pipes were exposed to a deaerated 1% NaCl solution containing CO2, at temperatures in the range of 25 oC to 80 oC for 48 hours. Analogous samples were exposed to the adjacent vapour phase. The layer of corrosion products which formed on the base metal and welded regions of the samples was investigated using mass loss Effects of Microstructure on Corrosion of X70 Pipe Steel

Analysis of the corrosion scales formed on API 5L X70 and Effects of Microstructure on Corrosion of X70 Pipe Steel

With regard to the difference in the microstructure of the metal substrate, the API5L X70 steel has a ferrite-pearlite microstructure, whereas the API5L X80 has a ferritic microstructure with martensite-austenite (MA) microconstituent. These differences affect not only the mechanical properties of the steel but also its corrosion rate 4,12,17.Analysis of the corrosion scales formed on API 5L X70 and Effects of Microstructure on Corrosion of X70 Pipe Steel With regard to the difference in the microstructure of the metal substrate, the API5L X70 steel has a ferrite-pearlite microstructure, whereas the API5L X80 has a ferritic microstructure with martensite-austenite (MA) microconstituent. These differences affect not only the mechanical properties of the steel but also its corrosion rate 4,12,17.Anisotropy and microstructural evolutions of X70 pipeline Effects of Microstructure on Corrosion of X70 Pipe Steel Macro- and microscale investigations of hydrogen embrittlement in X70 pipeline steel by in-situ and ex-situ hydrogen charging tensile tests and in-situ electrochemical micro-cantilever bending test. Materials Science and Engineering A, Vol. 772, Issue. , p. 138762.

Anodic Dissolution in Sulfuric Acid Pickling Solutions of Effects of Microstructure on Corrosion of X70 Pipe Steel

steel due to the faster and contentious dissolution of X70 steel with temperature. Results together were in good agreement with each other confirming that X70 steel suffers sever corrosion in H 2 SO 4 solution and that effect increases with increasing the exposure period and temperature.Application of SSRT to estimate the effect of corrosive Effects of Microstructure on Corrosion of X70 Pipe Steel of pipe steel in media similar in composition to soil electrolytes; and second, to study whether the SCC of pipe steel can be hindered by organic corrosion inhibitors of various classes. Experimental Experiments were carried out using 1420x18.7 mm specimens of X70 strength class pipe steel cut from a pipe. The chemical composition of the steel Effects of Microstructure on Corrosion of X70 Pipe Steel Cited by 1Publish Year 2019Author Lochan Sharma, Rahul Chhibber1 Effect of Carbon Steel Composition and Microstructure on Effects of Microstructure on Corrosion of X70 Pipe Steel Figure 11 X70 steel, plane A, B, C microstructures. Figure 12 X70 steel, m icrostructure consists of tempered martensite. X65II This steel contains a very low amount of carbon (0.07 wt% C). As shown in Figure 13, there are significant differences in the microstructure between planes B, C, and plane A.

Cited by 81Publish Year 2009Author C.W. Du, X.G. Li, P. Liang, Z.Y. Liu, G.F. Jia, Y.F. ChengEffects of Microstructure on Corrosion of X70 Pipe Steel Effects of Microstructure on Corrosion of X70 Pipe Steel

Effects of Microstructure on Corrosion of X70 Pipe Steel in an Alkaline Soil Article (PDF Available) in Journal of Materials Engineering and Performance 18(2):216-220 March 2009 with 295 ReadsCited by 83Publish Year 2013Author Sajjad Bordbar, Mostafa Alizadeh, Sayyed Hojjat HashemiMicrostructure evolution and electrochemical corrosion Effects of Microstructure on Corrosion of X70 Pipe Steel Mar 01, 2019In present work, a heat treatment procedure was used to alter the microstructure of base metal and to study its effect on the electrochemical corrosion behaviour of X70 pipe line steel. Heat treatment of X70 steel was performed at two austenitizing temperatures (e.g. 1000 °C and 850 °C) followed by quenching and subsequent tempering at 300 °C, 450 °C and 600 °C.Combined Effect of Alternating Current Interference and Effects of Microstructure on Corrosion of X70 Pipe Steel The corrosion morphology of X70 steel after immersion in the NS4 solution for 24 h without CP and AC is shown in Figure 5 a. It is seen that preferential dissolution occurs in ferrite matrix, and the grain boundaries and carbides remain contact, illustrating the metallographic microstructure of the X70 steel.

Coupling Effects of pH and Dissolved Oxygen on the Effects of Microstructure on Corrosion of X70 Pipe Steel

1. Introduction. The corrosion of buried pipeline steel in the soil seriously threatens the safe operation of the pipeline [1,2,3].Currently, various factors affecting soil corrosion of pipeline steel, including temperature, pH, water content, salinity, microbial and other factors have been extensively studied [4,5,6,7,8,9,10,11], but most studies have focused on the anode process of corrosion.Effect of Microstructure on Corrosion of Steels in Aqueous Effects of Microstructure on Corrosion of X70 Pipe Steel Under a diffusion-controlled corrosion mechanism, microstructure of the steel had no effect on corrosion rate.Effect of Microstructure on Hydrogen Diffusion in Weld and Effects of Microstructure on Corrosion of X70 Pipe Steel The aim of this research was to evaluate the influence of microstructure on hydrogen permeation of weld and API X52 base metal under cathodic protection. The microstructures analyzed were of the API X52, as received, quenched, and annealed, and the welded zone. The test was performed in base metal (BM), quenched base metal (QBM), annealed base metal (ABM), and weld metal (WM).

Effect of Temperature on Corrosion Behavior of X65

Effect of Temperature on Corrosion Behavior of X65 Steel in Simulated Deep Sea Environment Effects of Microstructure on Corrosion of X70 Pipe Steel [4,8] have reported the stress corrosion cracking of X70 steel was affected by hydrostatic pressure in deep sea environment. Yang [5-7] have reported the effect . Int. J. Electrochem. Sci., Effects of Microstructure on Corrosion of X70 Pipe Steel Microstructure of X65 pipeline steel for experimentsEffect of microstructure variation on the corrosion Effects of Microstructure on Corrosion of X70 Pipe Steel The effect of microstructure variation on the corrosion behavior of high-strength low-alloy (HSLA) steel was investigated. The protective property of the corrosion product layer was also explored. Experimental results reveal that the type of microstructure has significant effect on the corrosion resistance of HSLA steel. The measurement results of weight loss, potentiodynamic polarization Effects of Microstructure on Corrosion of X70 Pipe Steel Effect of pH value on corrosion of carbon steel under an Effects of Microstructure on Corrosion of X70 Pipe Steel Oct 26, 2015Huimin Qin, Yanxia Du, Minxu Lu, Qingsi Meng, Effect of dynamic DC stray current on corrosion behavior of X70 steel, Materials and Corrosion, 10.1002/ma201911022, 71, 1, (35-53), (2019). Wiley Online Library

Effects of Alloying Elements in Effects of Microstructure on Corrosion of X70 Pipe Steel - Corrosion Materials

Effects of Alloying Elements in Nickel-Base Alloys The different elements that make up an alloy can drastically change the mechanical properties, corrosion resistance and the metals microstructure. While chromium, nickel, molybdenum, iron may be the primary alloying elements, other elements like tungsten, carbon, aluminum, titanium, copper and sulfur can have significant effects as well Effects of Microstructure on Corrosion of X70 Pipe Steel Effects of Heat Treatment Process on Mechanical Properties Effects of Microstructure on Corrosion of X70 Pipe Steel Effects of heat treatment process of quenching and tempering under different temperature conditions on mechanical properties of X70 grade pipeline steel bends were studied. Brinell hardness, yield strength, tensile strength, elongation and impact absorbing energy of the bends were tested by using hardness tester, cupping machine and impact testing machine, respectively.Effects of Heat Treatment Process on Mechanical Properties Effects of Microstructure on Corrosion of X70 Pipe Steel Effects of heat treatment process of quenching and tempering under different temperature conditions on mechanical properties of X70 grade pipeline steel bends were studied. Brinell hardness, yield strength, tensile strength, elongation and impact absorbing energy of the bends were tested by using hardness tester, cupping machine and impact testing machine, respectively.

Effects of Microstructure on Corrosion of X70 Pipe Steel Effects of Microstructure on Corrosion of X70 Pipe Steel

Aug 25, 2008Corrosion of X70 steel with different heat treatments (quenching, air cooling, and furnace cooling) in an alkaline soil was investigated by weight-loss, surface characterization and electrochemical measurements. The cathodic/anodic reactions of X70 steel in alkaline soil are dominated by the oxygen reduction and formation of iron oxides that deposit on the steel surface.Effects of microstructure alteration on corrosion behavior Effects of Microstructure on Corrosion of X70 Pipe Steel Mar 01, 2013The main goal of the present study is to modify the corrosion behavior of welded pipe steel produced in using a thermo-mechanical control-rolled API X70 steel. In fact, the objective of this work is to design an appropriate heat treatment cycle to get a suitable microstructure and uniform hardness, thus enhancing the corrosion resistance of the Effects of Microstructure on Corrosion of X70 Pipe Steel HIC and SSC Behavior of High-Strength Pipeline SteelsFig. 4 Corrosion morphologies of the specimens and EDS analysis result X70 a, X80 b, X90 c, X90-C d, X100 e steels subjected to standard test; X70 f, X80 g, X90 h, X90-C i, X100 j steels subjected to severe test; SEM image of the corrosion products on X90-C steel surface k; EDS result of the position as denoted in Fig. 4k l

HIC and SSC Behavior of High-Strength Pipeline Steels

Fig. 4 Corrosion morphologies of the specimens and EDS analysis result X70 a, X80 b, X90 c, X90-C d, X100 e steels subjected to standard test; X70 f, X80 g, X90 h, X90-C i, X100 j steels subjected to severe test; SEM image of the corrosion products on X90-C steel surface k; EDS result of the position as denoted in Fig. 4k lInvestigation of corrosion resistance of high-strength low Effects of Microstructure on Corrosion of X70 Pipe Steel Aug 19, 2019Corrosion behaviour of HSLA steel immersed in fresh and salt water for a four weeks period was investigated by weight loss method at room temperature. Effects of Microstructure on Corrosion of X70 Pipe Steel P. Liang, Z. Y. Liu, G. F. Jia and Y. F. Cheng, Effects of microstructure on corrosion of X70 pipe steel in an alkaline Effects of Microstructure on Corrosion of X70 Pipe Steel S. Lee, N. J. Kim and S. S. Ahn, Correlation of microstructure and Effects of Microstructure on Corrosion of X70 Pipe Steel Mechanical and Metallurgical Properties of Grade X70 Steel Effects of Microstructure on Corrosion of X70 Pipe Steel The effect of acicular ferrite (AF) and bainite (B) obtained by heat treatment (HT) applied to an API X70 steel on corrosion resistance and stress corrosion cracking (SCC) susceptibility was Effects of Microstructure on Corrosion of X70 Pipe Steel

Microstructure and Mechanical Properties of Two Api

showed a banded microstructure consisting of polygonal ferrite and pearlite in both steels, with smaller grain size and the presence of a small quantity of bainite in the X70 steel. All the mechanical tests revealed a ductile behavior for the two steels. The X70 steel is preferable for the pipeline project, dueMicrostructure and Mechanical Properties of Two Api showed a banded microstructure consisting of polygonal ferrite and pearlite in both steels, with smaller grain size and the presence of a small quantity of bainite in the X70 steel. All the mechanical tests revealed a ductile behavior for the two steels. The X70 steel is preferable for the pipeline project, dueMicrostructure and Mechanical Properties of X70 Pipeline Effects of Microstructure on Corrosion of X70 Pipe Steel Anti-H2S X70 pipeline steel was developed. The microstructure of X70 pipeline steel was studied by the analysis of OM, SEM and TEM. The precipitation behavior was discussed. The comprehensive mechanical properties, HIC and SCC performance were systematically studied. The results indicated that the microstructure of the experimental steel was mainly acicular ferrite and granular bainite.

Microstructure and Mechanical Properties of X70 Pipeline Effects of Microstructure on Corrosion of X70 Pipe Steel

Anti-H2S X70 pipeline steel was developed. The microstructure of X70 pipeline steel was studied by the analysis of OM, SEM and TEM. The precipitation behavior was discussed. The comprehensive mechanical properties, HIC and SCC performance were systematically studied. The results indicated that the microstructure of the experimental steel was mainly acicular ferrite and granular bainite.PAPER OPEN ACCESS Mechanical Characterization of tensile and impact properties of X70 steels pipeline exposed to wet hydrogen sulphide (H 2S) environments were investigated by Pengyan et al. [12], through corrosion and mechanical testing. The results suggested that the Charpy absorbed energy, tensile strength and reduction in area of X70 steel decreased after H 2S corrosion. When hydrogen was Effects of Microstructure on Corrosion of X70 Pipe Steel Preferential Weld Corrosion Microstructure and Effects of Microstructure on Corrosion of X70 Pipe Steel The effect of composition and microstructure on PWC in CO 2-containing media was investigated on 12 weldments produced in X52 and X65 grade pipe materials using TIG and MMA processes. Corrosion tests were conducted in a re-circulating vessel on segmented weld electrodes in CO 2 -containing media, with two levels of chloride content.

Preferential Weld Corrosion Microstructure and Effects of Microstructure on Corrosion of X70 Pipe Steel

The effect of composition and microstructure on PWC in CO 2-containing media was investigated on 12 weldments produced in X52 and X65 grade pipe materials using TIG and MMA processes. Corrosion tests were conducted in a re-circulating vessel on segmented weld electrodes in CO 2 -containing media, with two levels of chloride content.Role of Microstructure in Susceptibility of X70 Pipeline Effects of Microstructure on Corrosion of X70 Pipe Steel In order to investigate the susceptibility of steels to hydrogen embrittlement as a function of their microstructure X70 steel was chosen in different conditions normalized transfer bar, as-received hot rolled strip and heat affected zone (HAZ). Notched and fatigue pre-cracked samples were subjected to electrochemical hydrogen charging to achieve 2 ppm hydrogen content.Role of S 2 ions on the microstructure change and the Effects of Microstructure on Corrosion of X70 Pipe Steel Aug 19, 2019The effect of heat treatment on the electrochemical corrosion and microstructural behaviour of API X70 line pipe steel in sea water containing thiosulphate solutions was

The Effect of Microstructure on Stress-Strain Behaviour Effects of Microstructure on Corrosion of X70 Pipe Steel

Abstract. The effect of microstructure on the stress-strain behaviour of pipeline steels was studied. Slow strain rate (2 × 1 0 6 s 1) tests were conducted on grade X65 and X100 steels in silicone oil and hydrogen carbonate/carbonate solution.The as-received grade X100 steel at 7 5 C showed serrated stress-strain curves. The magnitude of the serrations depended upon the strain rate Effects of Microstructure on Corrosion of X70 Pipe Steel x70 pipe corrosion pits - pneuscoolscharleroi.beEffects of stress on MFL responses from elongated Effects of Microstructure on Corrosion of X70 Pipe Steel A hydraulic pressure vessel simulation of an operational length of pipeline was constructed to investigate the effects of line pressure stress conditions on Magnetic Flux Leakage (MFL) signals from elongated corrosion pits in API X70 steel line pipe. Cited by 16. Chat Now

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