Investigation of corrosion rate on the modified 410 martensitic stainless steel in tempered condition

Prifiharni, Siska; Sugandi, Moh. Tri; Pasaribu, Rahmat Ramadhan; Sunardi, Sunardi; Mabruri, Efendi

doi:10.1088/1757-899x/541/1/012001

Cited by 7 publications

(8 citation statements)

References 22 publications

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“…The fact can be explained by the most favourable conditions of a working environment attack on the T tube which multiply concentration is tens and hundreds of times higher than average corrosivity along walls. During operation, metal of well equipment tubes experiences cementite decay which keeps in step with the findings [11]- [15].…”

Section: Figure 6 Nature Of Microhardness Distribution Within the Cut...supporting

confidence: 60%

“…It is known [22] that in the oxidation process of iron and its alloys, a surface oxide layer mainly consists of wustite (FeO) and magnetite (Fe3O4) which crystalline lattice finishes building α -Fe lattice. Since, such components as ions and anions are available in technological environments of oil wells favouring cubic latitude formation in the process of corrosion reactions (as a rule, they finish building FeO or Fe3O4 lattice) while promoting the interlayer development [23].…”

Section: Figure 9 Diagrammatic Structure Of Corrosion Products At The...mentioning

confidence: 99%

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Degradation of the internal well equipment steel under continuous service in the corrosive and aggressive environments

Vynnykov¹,

Kharchenko²,

Manhura³

et al. 2023

Min. miner. depos.

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Purpose is to analyze steel degradation of the internal well equipment during its continuous service while contacting directly the corrosive environments. Methods. A range of research concerning the damaged metal tubes of the internal equipment for oil and gas wells, in particular regarding continuous service tubing, comprised both standard and specific studies involving different variations of X-ray spectral analysis with the use of scanning electron microscope JSM-35CF (JEOL Company, Japan) and SEM-515 with microanalyzer Link by Philips Company. The studied samples have been made of tubing in the period of the unauthorized and emergency well shutdowns; life of the wells is 0 up to 15 years. To analyze both structure and chemical composition of metal inclusive of such gases as oxygen and hydrogen, chippings were produced mechanically from various parts of tube walls. Findings. X-ray structural studies have made it possible to obtain data confirming cementite decay (Fe3С) in the tube metal during continuous operation of the internal well equipment. X-ray structural analysis methods have helped identify the parameters of crystal lattice of a matrix; and a level of elastic distortions of the lattice (i.e. microstresses of the distortions) has been evaluated as well as carbon distribution within ferrite and cementite. The abovementioned offered the possibility to describe both reason and mechanism of the reduced resistance to corrosion in the context of internal well equipment. Originality. New regularities under cementite decay in tube metal have been identified in addition to changes in the parameters of a crystal a lattice; microstresses of the lattice distortions; and carbon distribution within ferrite and cementite. The aforesaid helps explain in a new way both reason and mechanism of the reduced resistance to corrosion in the context of internal well structures operating continuously in aggressive environments. The basic sources and mechanisms of tube steel degradation, resulting from the metal hydrogenation and oxidation, have been defined which becomes the foundation to develop scientifically the substantiated measures mitigating the negative impact on the condition of the internal well facilities operating continuously in the chemically aggressive environments. Practical implications. Degrading hydrogen effect on the crystal lattice of metal has been proved. The effect creates conditions under which tube structures of oil and gas wells experience their failure.

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Section: Figure 6 Nature Of Microhardness Distribution Within the Cut...supporting

confidence: 60%

Section: Figure 9 Diagrammatic Structure Of Corrosion Products At The...mentioning

confidence: 99%

Degradation of the internal well equipment steel under continuous service in the corrosive and aggressive environments

Vynnykov¹,

Kharchenko²,

Manhura³

et al. 2023

Min. miner. depos.

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“…It is generally accepted that both HIC and steel swelling progress if only external loads are not available. SSCC cracks result from loads [20]. Since, the pilot steel has no tendency to HIC and swelling while being under loads then the results support the idea that external loads stimulate the types of metal destruction of well pump rods.…”

Section: Metallographic Studiessupporting

confidence: 53%

“…The test involves 96 h aging of the stressed samples in the synthetic NACE solution (5% NaCl solution +0.5% CH3COOH; continuous H2S saturation with 10 ml/min barbotage velocity; and рН = 3). Besides, minimum solution volume was 4 ml per 1 сm 2 of a sample surface [13]. Then, the samples were cut; the cut surface was polished and etched in the environment of chemical reagents.…”

Section: Steelmentioning

confidence: 99%

Analysis of corrosion fatigue steel strength of pump rods for oil wells

Vynnykov¹,

Kharchenko²,

Manhura³

et al. 2022

Min. miner. depos.

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Purpose is to perform analysis of corrosion durability (fatigue) of pump rod materials in terms of various chemically active simulation environments, and study influence of economically modified rare-earth impurity on corrosion fatigue strength of pump rod materials. Methods. 40 and 20N2M steel grades have been applied as well as experimental steel (ES). Steel of the conditinal ES grade has been melted within a pilot site of Institute of Electric Welding Named after E.O. Paton of the National Academy of Sciences of Ukraine. The steel was alloyed economically by means of a micro impurity of a rare-earth element (REE) being 0.03% of cerium; in addition, it contained comparatively low concentration of sulfur and phosphorus as well as minor concentration of dissolved hydrogen. The following has been used as simulation environments: 1) NACE environment (i.e. 5% NaCl solution which contained 0.5% СН3СООН, and saturated H2S; t = 22 ± 2°C; pH = 3.8-4.0); 2) 3% NaCl solution without hydrogen sulphide. Once every day, the environment was replaced to oxygenate it up to 8-10 mg/l concentration. Findings. Stability against sulfide stress-corrosion cracking (SSCC), hydrogen initiated cracking (HIC), and corrosion fatigue of steel of deep pump rods for oil industry has been studied. It has been defined that the experimental steel, modified economically by means of micro impurities of a REE, meets NACE MR0175-96 standard in terms of chemical composition as well as strength; in turn, 20N2M and 40 steel grades have high resistance neither to SSCC (threshold stresses are < 0.8 s) nor to corrosion fatigue attack; moreover, steel grade 40 has demonstrated low resistance to HIC (CLR > 6% and CTR > 3%). Originality. It has been identified that corrosion fatigue attack results from hydrogen penetration of steel initiating its cracking and hence destruction under the effect of alternating loads accelerated by the action of corrosive environment. Further, surface micro destructions, influenced by micro stresses, transform into large discontinuities and cracks with following macro destructions. Practical implications. It has been proved that high resistance to corrosion cracking can be achieved by means of refining of pump-rod steel of ferrite and perlite type using metallurgical methods, i.e. 0.01-0.03% REE microalloying.

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“…The corrosion rate after tempering at 700 0 C for 6 hours increased with increasing NaCl solution and operating temperature. The increase in temperature causes a higher corrosion rate because the oxygen diffusion rate increases [5]. The longer the holding time on self-tempering, the material's toughness and hardness also increase, and the corrosion rate decreases.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Characteritics of Medium Carbon Steel after Heat Treatment Using Sand as Cooling Media

Sunardi

Randu

Listijorini

et al. 2021

Intek

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Stress concentrations cause many machine element failures. Failure will occur more rapidly if the machine elements obtain repeated and fluctuating loading. For this reason, the material for machine elements must have better fatigue life. There are various attempts made to increase material life and other mechanical properties. In this study, the research sample used is AISI 4140 steel. The samples obtain hardening followed by cooling and tempering. The hardening temperature is 8500C with a holding time of 17 minutes. The cooling media in this research are dry sand, semi-wet sand, and wet sand. Wet measurements based on volumetric ratios. Semi-wet sand with a ratio of sand and water 4: 1, sandy sand 4: 2. The final process is tempering treatment, with a temperature of 2500C. The material fatigue test refers to the JIS Z 2274 Standard. From this study, the heat treatment given can reduce the fatigue life of the material, even though the hardness increases. The higher the cooling rate, the hardness of the material increases, but the fatigue life is low.

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Investigation of corrosion rate on the modified 410 martensitic stainless steel in tempered condition

Cited by 7 publications

References 22 publications

Degradation of the internal well equipment steel under continuous service in the corrosive and aggressive environments

Degradation of the internal well equipment steel under continuous service in the corrosive and aggressive environments

Analysis of corrosion fatigue steel strength of pump rods for oil wells

Fatigue Characteritics of Medium Carbon Steel after Heat Treatment Using Sand as Cooling Media

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