Carbon Steel Grades Research Articles

Improvement of methodology and development of software calculation of routes production of pipes by sink drawing taking into account accuracy

For designing routes of sink drawing pipes a certain assortment it is necessary to choose correctly the initial sizes of preparation, to calculate admissible deformations on diameter and a wall. Sink drawing to pipes after short-drawing drawing or rolling on cold rolling mills, ie pipes having a certain difference.When designing routes to drawing it is necessary to predict in advance the size and direction of change wall thickness. The analysis of influence and its character for each parameter on change of wall thickness is carried out. Taking into account the analysis and the nature of the identified dependences, tested the construction of multiple linear and nonlinear regression to determine the wall thickness of the workpiece by , , , , .To order to assess the accuracy of the pipes after sink drawing, technological routes of pipes production from carbon steel grades were developed and investigated. According to the developed routes by the production technology, batches of tubes were drawn, samples were taken from each batch and wall thickness measurements were made at equally distant points of pipe cross-section.According to the results of measurements, correlation-regression analysis was performed, factors influencing the variation of difference were determined and regression models were built.With a small diversity of the workpiece (less than 3%) the diversity of the finished pipes increases, with a diversity of the workpiece 3 ... 4% the diversity of the finished pipes changes little and > 4% the diversity of the finished pipes decreases.The intensity of the correction ( <1) depends on the compression ratio in diameter : the larger the value , the more intense the correction of the difference. That is, to correct the difference ( >4%) in the sink drawing, it is necessary to increase the coefficient of extraction.The results of research are introduced into the calculations of routes and technological maps of production in order to predict the diversity of finished pipes during drawing and supplemented the software for determining the size of the workpiece when designing routes for drawing carbon cold-formed pipes by sink drawing.

Cyclic behaviour and hysteretic model of austenitic stainless steel bolted T-stubs

The aim of this paper is to investigate the hysteretic behaviour of stainless steel bolted T-stub connections. A total of 22 bolted T-stubs in austenitic grade EN 1.4301 were tested under monotonic loading and cyclic loading under both variable and constant amplitudes. The tested T-stubs were carefully designed with two different bolt configurations and were fabricated with two types of stainless steel bolts – A4–70 and A4–80 thus allowing different failure modes to be obtained. Three additional bolted T-stubs in carbon steel grade Q345B were used as benchmark specimens to facilitate a direct comparison of the performance of carbon and stainless steel T-stubs under cyclic loads. Monotonic loading tests were conducted to acquire basic parameters of the cyclic loading protocols employed in the cyclic loading tests. The hysteretic responses of the tested T-stubs under two variable amplitude loading histories and three proportional constant amplitude loading histories were recorded and were further analysed in terms of failure characteristic, hysteresis response, skeleton curve, energy dissipation and strength degradation. Based on the evolution of the hysteresis curves, standard hysteresis loops were acquired and were used to develop a novel hysteretic model able to simulate the initial loading branch, the unloading branch and reloading branch of the hysteretic response. It has been demonstrated that the developed hysteretic models provide a close agreement with the obtained experimental results and can thus be used to estimate the expected energy dissipation of bolted stainless steel connections subjected to cyclic loads.

Вплив швидкості охолодження при затвердінні безперервнолитої заготовки на характеристики дендритної структури сталі марки ОС

The analysis of the formation process of the cast structure of carbon steel grade ОС (ДСТУ ГОСТ 4728:2014) after the completion of its crystallization with a change in a wide range of metal cooling rate during solidification of a continuously cast billet (ССB) with a diameter of 450 mm has been carried out. The effect of the cooling rate during the solidification of ССB Ø 450 mm on the parameters of the chemical heterogeneity of the distribution of silicon and manganese in the microstructure of carbon steel has been shown. It has been determined that the effect of the metal cooling rate during the solidification of the investigated CCB on the size of dendritic crystals is described by the inversely proportional relationship: у = 423.75 х-0,161. With a change in the cooling rate of the metal during solidification from 106 до 1 °C/min, the size of the dendrites in the direction from the surface to the central layers of the CCB Ø 450 mm increased by ~ 8 times, and the density of the dendritic structure of carbon steel ОС decreases by 65 times. In this case, the nature of its dependence on the intensity of heat removal is the opposite nature of the change in the size of dendrites. It has been established that by varying the cooling rate in the range 1 – 106 °C/min, one can achieve a significant change in the average size and density of dendritic crystals while maintaining the constancy of the volume fraction of segregation areas of silicon and manganese ~ 24% in carbon steel (0.42 – 0.50 % wt. C). It has been determined that in the entire investigated range of cooling rates 1 – 106 °C/min, the coefficients of dendritic segregation КдI and КдII of silicon and manganese change insignificantly and amount to 1.8-1.9 and 1.5 for КдI and КдII, respectively. In this case, the values of the coefficients КдI and КдII for both elements are practically constant in both pearlite and ferrite. It has been proven that both silicon and manganese have high diffusion mobility only at sufficiently high temperatures, when steel is in a solid-liquid state. Based on the results of X-ray microanalysis, it has been established that the heterogeneity of the distribution of chemical elements, which is formed as a result of dendritic segregation of silicon and manganese, is the primary and constant component of the microstructure of carbon steel. Keywords: carbon steel, continuously cast billet, solidification, cooling rate, dendritic structure.

Slag foaming estimation in the electric arc furnace using machine learning based long short-term memory networks

Slag foaming is a key factor in terms of quality and productivity in the electric arc furnace (EAF) steelmaking process. Optimal control of slag foaming is required, but is difficult due to the absence of practical on-line measuring methods and the broad process variability. In this study, a soft sensor model, which correlates the influential process variables with the slag foaming height, was developed by using machine learning based long short-term memory (LSTM) networks for modeling sequential and nonlinear data. The developed model was validated using actual steelmaking dataset in terms of performance metrics such as the root mean square error (RMSE), coefficient of determination (R2), and correlation coefficient corresponding to a value for a SS400 carbon steel grade to be 42.3, 0.905, and 0.963, respectively. In order to evaluate the general applicability of the developed model for other steel grades, data for A615 and S355 steel grades were also applied and found to satisfy the benchmark standards indicating that the developed model can be applied to the broad range of other steel grades. Sensitivity-based Pruning (SBP) on the model shows that electricity, carbon and oxygen are the most influential process variables to the slag foaming height and could potentially be used to promote enhanced optimization in terms of energy saving and cost-efficiency for the EAF steelmaking process.

Shielded Active Gas Forge Welding of an L80 Steel in a Small Scale Shielded Active Gas Forge Welding Machine

The Shielded Active Gas Forge Welding (SAG-FW) method is a solid-state welding technique in which the mating surfaces are heated by induction heating or direct electrical heating before being forged together to form a weld. In this article, an API 5CT L80 grade carbon steel alloy has been welded using the SAG-FW method. A small-scale forge welding machine has been used to join miniature pipes extracted from a large pipe wall. The welding was performed at three different forging temperatures, i.e., 1300 °C, 1150 °C and 950 °C, in some cases followed by one or two post weld heat treatment cycles. In order to qualify the welds, mechanical and corrosion testing was performed on miniature samples extracted from the welded pipes. In addition, the microstructure of the welds was analysed, and electron probe microanalysis was carried out to control that no oxide film had formed along the weld line. Based on the complete set of experimental results, promising parameters for SAG-FW welding of the API 5CT L80 grade steel are suggested. The most promising procedure includes forging at relative high temperature (1150 °C) followed by rapid cooling and a short temper. This procedure was found to give a weld zone microstructure dominated by tempered martensite with promising mechanical and corrosion properties. The investigation confirmed that small scale forge welding testing is a useful tool in the development of welding parameters for full size SAG-FW welding.

Effect of heat treatment on hardness and toughness of EN8 steel

The heat treatment and quenching process provides tremendous advantages for the steels by modifying the mechanical properties and affecting phase change in the structure of steel. So we perform this heat treatment process in various quenching medium to test the EN8 steels. Few specimen of EN8 steel were studied and analyzed after heating them in the Muffle Furnace between 750 °C and 950 °C followed by quenching in different medium. Oil, Water, and Air are used as different quenching medium. Using the Rockwell hardness equipment the mechanical properties such as hardness are measured, and the hardness of the quenched material is significantly greater than the parent material. The samples are then subjected to Charpy impact testing and Rockwell hardness testing after heat treatment. The sample was crated for Charpy test as per ASTM-E23, and for Rockwell hardness test as per ASTM-E18.In this work EN8 a grade of medium carbon steel is used. The composition of this EN8 steel is shown in the table below. The specimen was taken in the form of square bars 14 × 14 mm cross section which was then machined on lath machine by facing to the cross section of 10x10 mm and then cut. The final dimension of the specimen was 10x10x55 mm as per ASTM-E23. A U - notch of 2 mm depth was cut at the centre for impact testing.

Analysis of Tensile Strength, Hardness and Impact Energy of SAE1040 Steel Using Heat Treatment Processes

A systematic study was carried out to improve the mechanical properties of medium carbon steel grade SAE 1040 by heat treatment processes. Test specimen were prepared according to ASTM standards. Test specimen were heat treated in Gas furnace at austenitization temperature of 700C to obtain fully austenite structure, soaked for 90 minutes, cooled in air and furnace, and quenched in water separately. Mechanical properties such as hardness, tensile strength, yield strength, breaking strength, Young’s Modulus, elongation and impact energy were investigated in this study. It was observed that water quenching enhances materials’ hardness, tensile strength, yield strength, breaking strength and Young’s Modulus while reducing the elongation and impact energy as compared with untreated specimen. Furnace cooling decreases materials’ hardness, tensile strength, yield strength, breaking strength, Young’s Modulus while increasing the elongation and impact energy as compared with untreated specimen. Air cooling improved the materials’ mechanical properties such as hardness, tensile strength, yield strength, breaking strength, Young’s Modulus, elongation and impact energy as compared with untreated specimen. The results of this study show that the heat treatment technique greatly influences the mechanical properties of medium carbon steel grade SAE 1040.

Effect of modes of patenting carbon wire on its properties

To increase the competitiveness of carbon steel grades in enterprises, it is necessary to constantly improve the production process. The manufacture of high-strength wire is an urgent area for the enterprises of the hardware industry. One of the most important indicators determining the quality of the wire is the achievement of the specified physical and mechanical properties and microstructure. To this end, the wire is subjected to patenting, which is carried out in special units. To achieve the desired result during patenting, it is necessary to choose and observe the correct regimes depending on the diameter of the wire being processed and the chemical composition of the steel. When developing the modes, it is taken into account that martensite and a significant amount of excess ferrite along the grain boundaries are not allowed in the structure of patented steel. In the course of the work, an analysis was made of the most common carbon wire patenting modes in production, statistical dependences of the designated heating modes of the wire billet and cooling medium on the parameters of the steel wire, namely, its diameter and carbon content in steel, were obtained. An assessment of its strength properties is also carried out. According to the results of the analysis of patenting modes, it was found that certain difficulties arise when mastering the process of patenting steel wires of thick diameters and a carbon content of more than 0.8. Therefore, the solution of issues related to the course of these processes seems to be an urgent task. The results of the studies show the possibility of ensuring the necessary level of mechanical properties of steel in billets of thick diameters during the implementation of the process using lead melt. The data obtained can serve as a starting point for industrial testing and the prospective development of patenting processes.

Study of effect of loading rate on fracture toughness of SA516Gr.70 steel for nuclear pressure vessel and piping in DBTT regime and evaluation of shift in reference transition temperature

The objective of this work is to quantify the effect of loading rate on scatter as well as temperature-dependence of cleavage fracture toughness data of SA516 Gr.70 steel in the ductile-to-brittle transition temperature (DBTT) regime. This steel is a relatively high strength grade carbon steel and it is used for fabrication of nuclear pressure vessels, transportation casks and pipings etc. For integrity analysis in radioactive environment, the concept of master curve according to ASTM E1921 is used and the reference temperature T0 is evaluated from experimental data. The purpose of this work is to evaluate the change in T0 due to increase in loading rate when fracture specimens are tested in a modified split Hopkinson pressure bar (SHPB) test setup. In this work, a specially designed SHPB type test setup has been used to carry out the fracture tests using sub-sized single-edged notched bend specimens at a loading rate 700 m/min. The data from SHPB tests have been compared with those obtained from a lower loading rate of 0.5 m/min. From the results of the tests, it was observed that the median value as well as the scatter in fracture toughness increases with temperature in the DBTT regime for both the loading rates. For higher loading rate, the median values of fracture toughness increases slowly with temperature. The value of T0 was found to increase from −100 °C at 0.5 m/min to −10 °C at 700 m/min loading rate, signifying a positive shift in reference temperature with increase in loading rate. The reason for the observations regarding the variation of experimental data with loading rate has been explained from the point of view of micro-mechanism of the fracture process.

Overview of anaerobic corrosion of carbon steel radioactive waste packages in alkaline media in support of the Belgian supercontainer concept

AbstractThe so‐called supercontainer concept is currently being considered as the reference design for the final disposal of vitrified high‐level radioactive waste and spent fuel in Belgium. It comprises a prefabricated Portland cement‐based buffer that completely surrounds a carbon steel overpack. In this highly alkaline environment (pH ~13.6), and under normal conditions (i.e., without the ingress of aggressive species), the carbon steel overpack will be protected by a passive oxide film, which is expected to result in very low uniform corrosion rates. Considering the long timescales applicable to waste disposal, determining accurate and reliable estimates of the uniform corrosion rate under anoxic conditions forms a very important part of the safety and feasibility strategy. It is also crucial to demonstrate that no other form of corrosion apart from uniform corrosion takes place. This paper presents the progress of the research that has been made since the LTC2016 Workshop (Toronto, Canada) on uniform corrosion, pitting corrosion and stress corrosion cracking behaviour of P355 QL2 grade carbon steel exposed to an artificial concrete pore water solution.

An investigation on corrosion failure of a shell-and-tube heat exchanger in a natural gas treating plant

This study investigates failure of a shell-and-tube heat exchanger used in a natural gas treating plant. The shell was made of carbon steel grade A516, while its interior wall was cladded by grade 304 stainless steel. Tubes and tube-sheet of the heat exchanger were made of grade 304L austenitic stainless steel. After almost 6 years of service, tube failure was observed adjacent to the tube-sheet, which caused gas leakage, and consequently an increase in internal pressure of the shell. Detailed examinations were performed on the failed tubes. Results showed that crevice corrosion formed within the gap between tube external surface and tube sheet, followed by subsequent cracking was the main cause of failure. Mitigation strategies were suggested for future failure prevention.

Modeling and experimental study on the effects of temperature on the corrosion of API carbon steel in CO2-Saturated environment

This paper presents the results of a corrosion study conducted in carbonated brine (2% NaCl solution). All experiments were performed for a one-week duration at a total pressure of 41.37 MPa. The main test variables were temperature (38, 71, and 107 °C) and specimen material type (T95, C110, and Q125). The weight loss technique is used to assess the average corrosion rate (ACR). To detect the presence of localized corrosion, the actual load-carrying capacity (LCCT) of specimens was measured and compared with the one predicted from weight loss (LCCuc). Besides this, corrosion scale and specimen surface were examined using a digital microscope to investigate the presence of localized corrosion and explain ACR and LCCT measurements. To forecast corrosion under a CO2 saturated environment, a new model has been formulated considering a scale-forming condition.Results demonstrate the strong impact of temperature on the CO2 corrosion of API grade carbon steels (T95, C110, and Q125). Regardless of the material type, the highest corrosion rate was observed at 38 °C. Q125 displayed the highest CO2 corrosion resistance. All tested materials were prone to localized corrosion at high temperatures (71 and 107 °C). Model predictions show reasonable agreement with measurements displaying a discrepancy of mostly below 20%.

PROTECTIVE PROPERTIES OF OIL PRODUCTS RECEIVED OF WASTE

The protective properties of petroleum products obtained with the use of secondary raw materials, in particular plastic oils and polymer-containing bitumen, are investigated. The technology of obtaining plastic oils, was to conduct thermal degradation of polymeric wastes of polyethylene, polypropylene and polystyrene under laboratory conditions at atmospheric pressure in a batch reactor, with subsequent removal from the products of high-boiling fractions (onset of boiling > 320 °C), which match to plastic lubricant by their properties. Bitumen, in turn, was obtained by compounding high-boiling oil residues, in particular oil sludge with 10% by weight of polymeric additives of polypropylene and expanded polystyrene. For these products, resistance to atmospheric corrosion arising from the operation or storage of materials with metallic surfaces in open air, and environmental corrosion, which arises from the location of technological equipment and communications in the soil, especially in the presence of moisture, was investigated. In the process of researching it was found that both plastic oils and tested bitumen with all types of polymers have high protective properties. They prevent the formation of grade 3 metal sheets in aqueous solutions of 10 % NaCl and 3 % Na2SO3 corrosion cells, which mimic the effects of atmospheric corrosion. The study of the influence of electrochemical corrosion was carried out using polarization dependences obtained under laboratory conditions, using the potentiostat P-45X. To determine the protective properties we used working electrodes made of carbon steel grade St3 (Celsius = 0.14 cm2), reinforced in a frame of epoxy resin ED-5 with a hardener polyethylene polyamine with a deposited layer (layer thickness 0.1 mm) of the investigated of petroleum products that were placed in 0.5 M NaCl solution.It was determined that during the studies for 30 days, in the considered range of values, there was no change in the current density at a constant value of the potential (2.5 V), indicating the absence of electrochemical corrosion and the high protective properties of petroleum from secondary raw materials.

Objective Laws of Nitrogen Removal in the Vacuum Tank Degasser

This article discusses the problems of efficient removal of nitrogen in the vacuum tank degasser operating at the electric arc furnace shop of Uralskaya Stal (Ural Steel) OJSC in the course of manufacturing of high-quality low carbon steel grades by means of steel grades «2» and «T». In order to determine the reasonable and balanced treatment parameters that ensure the required level of nitrogen content in the above steel grades, an analysis of production data for the period of November-December 2016 has been carried out. This analysis is the basis for identifying the vacuum degassing parameters in compliance with the technological capabilities and well-balanced levels, which allow predicting the level of nitrogen content in steel. To assess the cumulative quantitative effect of the main parameters of vacuum degassing on nitrogen removal, there has been performed a regression analysis. As a result, there have been obtained multiple regression equations describing a rational combination of steel treatment parameters for achieving the required nitrogen removal level.

Optical Emission Spectroscopy as an Online Analysis Method in Industrial Electric Arc Furnaces

The development of online analysis methods for industrial electric arc furnaces (EAFs) has been a major research topic in recent years. Process control becomes even more important in the future due to the increase in both the usage of recycled metal as charge material and the metal recycling rate. For the industry to keep up with the pace, reliable chemical analysis of the slag together with online information about the furnace operation status is essential. Herein, optical emission spectroscopy is used to obtain the information about the electric arc together with radiative properties and surface temperature of the molten bath in an industrial EAF. The arc is visible for high alloyed steel grades within 5–30 min before tapping and the arc spectra are dominated by the optical emissions from the slag components. The plasma properties of the electric arc are determined with emission lines from atomic chromium, iron, and calcium. The time evolution of the spectra for high alloyed and carbon steel grades are compared with each other to provide a better understanding of the differences in the spectra between these two steel grades.

Experimental Development of Johnson–Cook Strength Model for Different Carbon Steel Grades and Application for Single‐Pass Hot Rolling

Johnson–Cook (JC) high‐temperature strength material models have been widely used in finite‐element analysis (FEA) to solve variety of hot rolling problems. Herein, the temperature‐ and strain rate‐related parameters of JC model are experimentally calibrated for eight different steel grades including SAE 1018 and SAE 1045, structural steels (ASTM A572‐60, ASTM A690, and ASTM A992), two V‐modified 1535/45 grades, and one automotive advanced high‐strength steel grade. Experimental data are obtained from tensile tests performed at strain rates from 0.001 to 20 s−1 and at temperatures between 900 and 1200 °C. A genetic algorithm approach is used to determine JC model parameters for different steel chemistries and to calculate the rolling pressure for a simple flat rolling process using both a common analytical formulation and a finite‐element model (FEM). A model for the effects of steel chemistry on the JC model parameters is also discussed.

Structural behaviour of stainless steel double extended end-plate beam-to-column joints under monotonic loading

Abstract The structural behaviour of beam-to-column joints with double extended end-plate connections is experimentally and numerically investigated in this paper. Two stainless steel grades representing austenitic and duplex stainless steel (i.e. EN 1.4301 and EN 1.4462 respectively) have been considered, whilst a joint made of the carbon steel grade Q345B was also tested as a benchmark to enable direct comparison of carbon and stainless steel joints. The employed bolt grades were A4-80 stainless steel bolts and 10.9 high strength bolts. A total of six full-scale joint specimens were tested including five stainless steel joints and one carbon steel control specimen and the applied force versus displacement (F-Δ) curves, as well as the corresponding moment versus rotation (M-ϕ) curves, were recorded and are reported herein, demonstrating excellent ductility behaviour of stainless steel joints. Advanced finite element (FE) models were developed using the ABAQUS software package and validated against the obtained test results, in terms of the obtained F-Δ curves and failure modes. The obtained initial rotational stiffness, plastic moment resistance and rotation capacity of the tested joints, were used to assess the accuracy of the predictions of the relevant European. American and Chinese design codes – EN 1993-1-8, ANSI/AISC 358-16 and GB 51022-2015 respectively – all of which are based on the respective design equations developed for carbon steel joints. It is concluded that the existing design standards lead to overly conservative strength predictions for stainless steel joints, as they fail to account for the significant strain-hardening and ductility of the material. Hence the development of novel design guidance in line with the observed response is warranted.

Finite Element Simulation of the Yoke Spline under Hot Forging Process

Nowadays, finite element method (FEM) has been widely used to forecast metal forming process, to analysis problems of workpiece, to decrease production cost, and to save time of die design. This work studied the use of FEM as a tool to design a hot forging die for producing an automotive part named Yoke Spline. The part was made from carbon steel grade S45CVL0. There are three processes to produce Yoke Spline, including the buster, rougher, and finisher processes. The objective of the study was to increase efficiency of production by 5%. To achieve this objective, it was necessary to design a new die in the buster process by using FEM to analyze the die size and shape. The new die must produce the workpieces without any defects. The defects regularly found in the forging workpieces are the dimension out of specification, the under filling, and the crack. The sizes of the buster upper die cover are the width and depth. The die width of 44.5, 46.5 and 49.5 millimeters and the die depth of 25, 28 and 31 millimeters were used in the hot forging simulation. From FEM simulation results, it was found that the die width of 46.5 millimeters and the die depth of 28 millimeters were the best to form workpieces without any defects. In summary, the simulation and experimental results were compatible.

Finite Element Simulation of Ball Joint under Hot Forging Process

Nowadays, the finite element method (FEM) has been widely used to forecast the metal forming process and finding the parameter optimized. This work studied the use of FEM as a tool to design and process optimize a hot forging die for producing an automotive part named Ball Joint that part was made from carbon steel grade S45C. The objective of the study was to increase the efficiency of production and extend the life cycle of the machine by using load not exceeding the machine capability. To achieve this objective, the new parameters must produce workpieces without any defects. The defects regularly found in the forging workpieces are the thickness out of specification, the underfilling, and the crack. The parameter of the rougher and finisher process to studies and optimized that cover is the die gap and forming load. The die gap of 4, 3 and 2 millimeters and the forming load not exceeding 85% of machine capability were used in the hot forging simulation. From FEM simulation results, it was found that the die gap of 3 millimeters of the rougher and finisher process was the best to form workpieces without any defects, workpieces thickness within specification and the forming load not exceeding of 85%. In summary, the simulation and experimental results were compatible.

The inhibition performance of mono-ethylene glycol on corrosion rate of x-80 grade carbon steel in saturated brine environment.

The formation/deposition of hydrate and scale in gas production and transportation pipeline has continue to be a major challenge in the oil and gas industry. Pipeline transport is one of the most efficient, reliable and safer means of transporting petroleum products from the well sites to either the refineries or to the final destinations. Acetic acid (HAc), is formed in the formation water which also present in oil and gas production and transportation processes. Acetic acid aids corrosion in pipelines and in turn aids the formation and deposition of scales which may eventually choke off flow. Most times, Monethylene Glycol (MEG) is added into the pipeline as an antifreeze and anticorrosion agent. Some laboratory experiments have shown that the MEG needs to be separated from unwanted substance such as HAc that are present in the formation water to avoid critical conditions in the pipeline. Internal pipeline corrosion slows and decreases the production of oil and gas when associated with free water and reacts with CO2 and organic acid by lowering the integrity of the pipe. In this study, the effect of Mono-Ethylene Glycol (MEG) and Acetic acid (HAc) on the corrosion rate of X-80 grade carbon steel in CO2 saturated brine were evaluated at 25oC and 80oC using 3.5% NaCl solution in a semi-circulation flow loop set up. Weight loss and electrochemical measurements using the linear polarization resistance (LPR) and electrochemical impedance spectroscope (EIS) were used in measuring the corrosion rate as a function of HAc and MEG concentrations. The results obtained so far shows an average corrosion rate increases from 0.5 to 1.8 mm/yr at 25oC, and from 1.2 to 3.5 mm/yr at 80oC in the presence of HAc. However, there are decrease in corrosion rate from 1.8 to 0.95 mm/yr and from 3.5 to 1.6mm/yr respectively at 25oC and 80oC on addition of 20% and 80% MEG concentrations to the solution. It is also noted that the charge transfer with the electrochemical measurements (EIS) results is the main corrosion controlling mechanism under the test conditions. The higher temperature led to faster film dissolution and higher corrosion rate in the presence of HAc. The EIS results also indicate that the charge transfer controlled behaviour was as a result of iron carbonate layer accelerated by the addition of different concentrations of MEG to the system. Key words: CO2 corrosion, Carbon steel, MEG, HAc, Inhibition, Environment.