Destruction Patterns of X70 Steel Sample, Possessing Cracks of Corrosion-Mechanical Origin, under Cyclic Loading

Nasibullina, O.A.; Гареев, А. Г.

doi:10.4028/www.scientific.net/msf.946.20

Cited by 38 publications

(12 citation statements)

References 10 publications

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“…For steel with 9% nickel content, the microstructure of the ringed zone in the welded joint will always be martensitic, even at very low cooling rates (in air) [10][11][12][13][14][15].…”

Section: Investigation Of the Process Of Nickel Impact On Steelmentioning

confidence: 99%

Welding Technology for Liquefied Natural Gas Tanks

Zaripov

Yalchigulov

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Liquefied natural gas (LNG) is of great importance in the energy segment of the economy. Natural gas, has a higher calorific value, better fuel efficiency and is more environmentally friendly, thereby gaining more importance compared to oil and coal. Not only does LNG offer greater flexibility in supply, it also has cost advantages for transportation starting from a distance of 2,000 km (at sea) and 4,000 km (on land) respectively. Consequently, the LNG market will grow in the coming decades compared to two other fossil sources - oil and coal. To use natural gas, it is necessary to create safe and economically profitable transportation routes from natural gas deposits to end users. One possibility is to transport gas in a liquefied state, at low temperatures. To ensure safe and reliable storage of liquefied gas at minus 163 ° C, good physical and mechanical properties of the base material and weld (corresponding tank system) are required. To meet these high requirements, appropriate welding methods and welding materials are selected. The paper presents an analysis of activities on the development of new welding materials and improvement of welding technologies for the construction of LNG tanks.

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“…For steel with 9% nickel content, the microstructure of the ringed zone in the welded joint will always be martensitic, even at very low cooling rates (in air) [10][11][12][13][14][15].…”

Section: Investigation Of the Process Of Nickel Impact On Steelmentioning

confidence: 99%

Welding Technology for Liquefied Natural Gas Tanks

Zaripov

Yalchigulov

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…As an indentor the tip from hardened steel, diamond or a hard-facing alloy of various form (a ball, a cone, a pyramid, needles) was applied. Hardness of material was defined on the special device -a hardness gage [1,6,9].…”

Section: Experiments Techniques and Materialsmentioning

confidence: 99%

Studying the Effect of Tempering Temperature during Heat Treatment on the Corrosion Resistance of 13Mn6 Steel Samples

Nasibullina

2021

SSP

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In the conditions of development of rates of the modern production the role of a heat treatment as a main way of receiving steels with the given structure and mechanical characteristics increases. The details applied on production have to have a long endurance not only at an ambient temperature, but also have high strength characteristics at low and high temperatures. In this regard, special attention is paid to the steel applied to manufacturing of such details. 13Mn6 steel concerns one of them. The definition of an influence of a heat treatment of steel - training at various temperatures, steel 13Mn6 on its rust resistance was the purpose of this work. For achievement of a goal such problems as a research of an influence of the various temperature of annealing of steel 13Mn6 on a value of hardness on Rockwell's method were solved; gravimetric researches after a heat treatment for identification of a temperature schedule of the annealing having the maximum indicators of corrosion were held. It is shown that, after spending vacation hardness of exemplars decreases with an increase in temperature. For assessment of corrosion aggression of the environment on the studied exemplars mass and deep indicators of corrosion were paid off. The maximum corrosion rate is observed when training, and the subsequent annealing at a temperature of 300°C, minimum at a temperature of annealing of 500°C.

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“…При сварке с управляемым переносом капель сварочная дуга горит в сварочной ванне, поэтому металл электрода наплавляется на стенку трубы, при этом расплавляет только поверхность стенки трубы, а расплавленный металл закрывает отверстие, которое может появиться в стенке трубопровода при сквозном проплавлении [11][12][13][14].…”

Section: Introductionunclassified

Specific features of applying machine welding with drop transfer in repair of operating pipelines

Zaripov

Mukhametzyanov

Pudovkin

2023

jour

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Introduction. Repair of pipelines under pressure of pumped media by means of welding is relevant to reduce the complexity of work. However, it may reduce the safety of work. To solve this issue, the authors consider applying the technological processes of machine welding with controlled drop transfer.Aim. To determine the main parameters of technological processes of machine welding with controlled drop transfer, affecting the safety of welding.Materials and methods. The authors developed a theoretical model for calculating the working thickness of a pipeline wall under pressure which they used for calculating the strength during welding. The dependence of the pipeline wall thickness at the edge of the penetrated hole on the internal pressure was also used in the calculations.Results. It was found that machine welding with controlled transfer of metal drops allows the wall penetration depth to be regulated by changing the welding variables. This significantly increases the safety of welding on pipelines under pressure of pumped media, compared to other types of welding. The developed welding processes ensure the safety of welding operations by means of a smooth and accurate control of the wall penetration depth. This is achieved by the correct selection of the background and peak current, control of the drop transfer process by arc voltage, control of the amount of weld metal and the heating temperature of welded structures.Conclusion. Recently, a number of repair technologies have been developed to improve the quality of welds in the construction and repair of trunk pipelines. The highly significant results of research on the development of machine welding technology with controlled drop transfer allow this technology to be recommended as an effective way to improve the safety of welding operations on pipelines under pressure of pumped media.

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Destruction Patterns of X70 Steel Sample, Possessing Cracks of Corrosion-Mechanical Origin, under Cyclic Loading

Cited by 38 publications

References 10 publications

Welding Technology for Liquefied Natural Gas Tanks

Welding Technology for Liquefied Natural Gas Tanks

Studying the Effect of Tempering Temperature during Heat Treatment on the Corrosion Resistance of 13Mn6 Steel Samples

Specific features of applying machine welding with drop transfer in repair of operating pipelines

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