Acicular ferritic microstructure of a low-carbon Mn–Mo–Nb microalloyed pipeline steel

Xiao, Furen; Liao, Bo; Ren, Dengfeng; Shan, Yiyin; Yang, Ke

doi:10.1016/j.matchar.2004.12.011

Cited by 108 publications

(55 citation statements)

References 4 publications

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“…It's interesting to note the presence of a small volumetric fraction of bainite / degenerated pearlite and the absence of acicular ferrite in X70 steel. For a pipeline steel, if these constituents can be achieved, it will be with better properties combination [24][25][26][27][28][29][30][31][32][33][34] , such as high mechanical strength, excellent fracture toughness, good H 2 S resistance, reduction of the Bauschinger effect and superior fatigue behavior, than the polygonal ferrite -pearlite microstructure. The distribution of inclusions in the two steels was also analyzed.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and mechanical properties of two Api steels for iron ore pipelines

et al. 2014

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This research compares the mechanical behavior of two API steels (X60 and X70) used in the longest pipeline in the world for the conveyance of iron ore. Tensile tests, Charpy impact tests, CTOD tests and fatigue crack growth tests are performed at ambient temperature. Metallographic examination 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, due its better mechanical resistance, with no significant loss of fracture toughness and fatigue resistance. Its performance could be even better, if an appropriate combination of thermomechanical processing parameters were able to produce a microstructure with minor amount of pearlite, where acicular ferrite/bainite are present.

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Section: Resultsmentioning

confidence: 99%

Microstructure and mechanical properties of two Api steels for iron ore pipelines

et al. 2014

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“…It reveals that the sample with only Cr addition has the largest amount of bainite, while the base steel without Cr and Al addition has the smallest Figure 4 shows the typical SEM microstructures of the three steels after isothermal holding for 3600 s at 350 • C following austenization at 1000 • C for 900 s. The classification method proposed in Ref. [11,25] is used in the present work to identify the microstructure in low-carbon bainitic steels: the microstructure is classified as ferrite (F), bainite ferrite (BF), and martensite (M). It can be observed that the microstructures of the three specimens mainly consist of lath-like BF and martensite/austenite (M/A) islands as shown in Figure 4.…”

Section: Methodsmentioning

confidence: 99%

The Effects of Cr and Al Addition on Transformation and Properties in Low‐Carbon Bainitic Steels

Tian

Zhou

et al. 2017

Metals

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Three low-carbon bainitic steels were designed to investigate the effects of Cr and Al addition on bainitic transformation, microstructures, and properties by metallographic method and dilatometry. The results show that compared with the base steel without Cr and Al addition, only Cr addition is effective for improving the strength of low-carbon bainitic steel by increasing the amount of bainite. However, compared with the base steel, combined addition of Cr and Al has no significant effect on bainitic transformation and properties. In Cr-bearing steel, Al addition accelerates initial bainitic transformation, but meanwhile reduces the final amount of bainitic transformation due to the formation of a high-temperature transformation product such as ferrite. Consequently, the composite strengthening effect of Cr and Al addition is not effective compared with individual addition of Cr in low-carbon bainitic steels. Therefore, in contrast to high-carbon steels, bainitic transformation in Cr-bearing low-carbon bainitic steels can be finished in a short time, and Al should not be added because Al addition would result in lower mechanical properties.

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“…The strength and toughness of the steels can be easily adjusted through the fraction of different types of ferrites in the matrix by optimizing the parameters of the OSWC process [19,33]. Figure 9 shows that the microstructure of steel subjected to the OSWC process is composed of AF, PF, pearlite, and their composite structures based on the CCT diagram.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Properties of J55ERW Steel Pipe Processed by On-Line Spray Water Cooling

Chen

Zhou

2017

Metals

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An on-line spray water cooling (OSWC) process for manufacturing electric resistance welded (ERW) steel pipes is presented to enhance their mechanical properties and performances. This technique reduces the processing needed for the ERW pipe and overcomes the weakness of the conventional manufacturing technique. Industrial tests for J55 ERW steel pipe were carried out to validate the effectiveness of the OSWC process. The microstructure and mechanical properties of the J55 ERW steel pipe processed by the OSWC technology were investigated. The optimized OSWC technical parameters are presented based on the mechanical properties and impact the performance of steel pipes. The industrial tests show that the OSWC process can be used to efficiently control the microstructure, enhance mechanical properties, and improve production flexibility of steel pipes. The comprehensive mechanical properties of steel pipes processed by the OSWC are superior to those of other published J55 grade steels.

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Acicular ferritic microstructure of a low-carbon Mn–Mo–Nb microalloyed pipeline steel

Cited by 108 publications

References 4 publications

Microstructure and mechanical properties of two Api steels for iron ore pipelines

Microstructure and mechanical properties of two Api steels for iron ore pipelines

The Effects of Cr and Al Addition on Transformation and Properties in Low‐Carbon Bainitic Steels

Microstructure and Mechanical Properties of J55ERW Steel Pipe Processed by On-Line Spray Water Cooling

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