Effect of hot Rolling and Cooling Conditions on the Microstructure, MA Constituent Formation, and Pipeline Steels Mechanical Properties

Kabanov, Alexander V.; Korpała, Grzegorz; Kawalla, Rudolf; Prahl, Ulrich

doi:10.1002/srin.201800336

Cited by 9 publications

(3 citation statements)

References 21 publications

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“…Their formation is attributed to variations in the cooling process and is commonly reported in instances where polygonal ferrite develops. 21,22 The presence of M/A can compromise the ductility of the steel, generating areas of increased hardness which may pose constraints for certain applications. 21,22…”

Section: Resultsmentioning

confidence: 99%

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Evaluation of corrosion behaviour and susceptibility to hydrogen-induced cracking in high-strength low-alloy X70 steels under sour gas conditions

Quiñones,

Condori,

Apaza-Apaza

et al. 2024

Corrosion Engineering, Science and Technology: The Internationa

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High-strength low-alloy (HSLA) steels find extensive usage in the oil industry for manufacturing pipes due to their requirement for materials with high mechanical and corrosion resistance. Among these steels, the HSLA X70 steels are particularly of great interest to the petroleum industry because of its high mechanical resistance, ductility and weldability. In this study, it was aimed to assess the corrosion behaviour of HSLA API X70 pipelines using electrochemical impedance spectroscopy (EIS) technique and evaluate its resistance to hydrogen-induced cracking (HIC). The analyses were conducted in non-sour and sour media, as per NACE TM0284 standard. Microstructural characterisations of polished and corroded samples were also conducted using scanning electron microscopy (SEM) and optical microscopy (OM). The results indicate that the resistance to HIC in API 5L X70 steel is compromised when exposed to surface corrosion in sour gas media. This susceptibility may be attributed to the presence of microconstituents MnS and M/A along the grain boundaries, which were found in the crack trajectory. The identified microstructural features are deemed to exert a significant influence on the propagation of cracks and the consequent susceptibility to HIC. Moreover, the EIS tests revealed the lowest corrosion resistance when exposed to H2S media, as MnS inclusions accelerate the active regions in the matrix, consequently leading to the formation of a plethora of corrosion products and the dissolution of iron.

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Section: Resultsmentioning

confidence: 99%

“…21,22 The presence of M/A can compromise the ductility of the steel, generating areas of increased hardness which may pose constraints for certain applications. 21,22…”

Section: Resultsmentioning

confidence: 99%

Evaluation of corrosion behaviour and susceptibility to hydrogen-induced cracking in high-strength low-alloy X70 steels under sour gas conditions

Quiñones,

Condori,

Apaza-Apaza

et al. 2024

Corrosion Engineering, Science and Technology: The Internationa

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“…The inlet temperature of the finishing rolling can be traced back to rough rolling, the heating furnace, and other processes, including the rough rolling outlet temperature (RDT), the oven temperature, and other process parameters [19], in addition to the data collected by the platform's entity perception layer, combined with the actual situation of field production and the experience of technical personnel, as well as the analysis results from the aforementioned mechanistic models. The following parameters for setting the final rolling temperature model were selected, as shown in Tables 1 and 2.…”

Section: Data Collectionmentioning

confidence: 99%

Digital Twin-Based Fault Diagnosis Platform for Final Rolling Temperature in Hot Strip Production

Desheng,

Jian,

Mingxin

et al. 2023

Materials

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The final rolling temperature in hot rolling is an important process parameter for hot-rolled strips and greatly influences their mechanical properties and rolling stability. The diagnosis of final rolling temperature anomalies in hot rolling has always been difficult in industry. A data-driven risk assessment method for detecting final rolling temperature anomalies is proposed. In view of the abnormal setting value for the strip head, a random forest model is established to screen the process parameters with high feature importance, and the isolation forest algorithm is used to evaluate the risk associated with the remaining parameters. In view of the abnormal process curve of the full length of the strip, the Hausdorff distance algorithm is used to eliminate samples with large deviations, and a risk assessment of the curve is carried out using the LCSS algorithm. Aiming to understand the complex coupling relationship between the influencing factors, a method for identifying the causes of anomalies, combining a knowledge graph and a Bayesian network, is established. According to the results of the strip head and the full-length risk assessment model, the occurrence of the corresponding nodes in the Bayesian network is determined, and the root cause of the abnormality is finally output. By combining mechanistic modeling and data modeling techniques, it becomes possible to rapidly, automatically, and accurately detect and analyze final rolling temperature anomalies during the rolling process. When applying the system in the field, when compared to manual analysis by onsite personnel, the accuracy of deducing the causes of anomalies was found to reach 92%.

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An overview on pipeline steel development for cold climate applications

Ohaeri

Szpunar

2022

Journal of Pipeline Science and Engineering

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Effect of hot Rolling and Cooling Conditions on the Microstructure, MA Constituent Formation, and Pipeline Steels Mechanical Properties

Cited by 9 publications

References 21 publications

Evaluation of corrosion behaviour and susceptibility to hydrogen-induced cracking in high-strength low-alloy X70 steels under sour gas conditions

Evaluation of corrosion behaviour and susceptibility to hydrogen-induced cracking in high-strength low-alloy X70 steels under sour gas conditions

Digital Twin-Based Fault Diagnosis Platform for Final Rolling Temperature in Hot Strip Production

An overview on pipeline steel development for cold climate applications

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