Effect of alloy design on improving toughness for X70 steel during welding

Zhu, Zheng; Han, Jian; Li, Huijun

doi:10.1016/j.matdes.2015.09.073

Cited by 31 publications

(24 citation statements)

References 32 publications

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“…As shown, base metal contains fine ferrite structure with a small amount of pearlite phase discontinuously placed in the high angle grain boundaries. According to the literatures, it is expected that a few martensite-austenite (M-A) constituents are also distributed along the ferrite grain boundaries [12]. The mean grain size of X70 steel is estimated about 4 μm.…”

Section: Microstructural Evaluationmentioning

confidence: 99%

“…The EDS analysis detected some complex Ti-rich carbonitrides (Ti,Nb,V) (C,N) on the fracture surface. Existence of this participate can be owing to the low free energy of TiN formation and relatively high diffusion coefficient of N and Ti in austenite [12]. A well-known relationship between the grain size and TiN is given [12,21]:…”

Section: Fractographymentioning

confidence: 99%

“…Their results showed that the developed model can artificially be applied to estimate the effects of all input variables such as carbon equivalent and tensile test parameters on hardness distribution in the HAZ. Zhu et al [12] studied mechanical properties of X70 welded joint with different Ti/N ratios and found that the welds with near-stoichiometric ratio demonstrates the highest impact energy value. It is also revealed that a low intercritical reheat temperature (810°C) led to the creation of austenite along the grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Characterization of X70 Steel Welded Joints Through Hardness Mapping and Tensile Strength Testing

Hamdollahzadeh

Omidvar

Amirnasiri

2017

Archives of Metallurgy and Materials

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In this paper, effects of preheating and type of electrode (E8010 and E8018) on microstructure and mechanical properties of 5L X70 steel welded joints were investigated. The microstructure of joint zone and fracture surface was analyzed by light optical microscope and scanning electron microscope equipped with energy dispersive spectroscopy. Hardness mapping and tensile test were also performed to find the relationship between microstructure and mechanical properties. The results showed a consistency between the hardness variation data and the microstructure of joint zone. Moreover, hardness mapping revealed coarse and fine grain subregions in the heat affected zone which were not detected in the micrographs. The tensile test indicated that the non-preheated sample, welded by cellulosic E8010, had the minimum value in the strength and the ductility of welded steel. The fractography also determined that size and distribution of strengthening phases affected the fracture mode of welded specimens.

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Section: Microstructural Evaluationmentioning

confidence: 99%

Section: Fractographymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Characterization of X70 Steel Welded Joints Through Hardness Mapping and Tensile Strength Testing

Hamdollahzadeh

Omidvar

Amirnasiri

2017

Archives of Metallurgy and Materials

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“…Many efforts have been made to improve the strength and performance of pipeline steels. The most effective method to improve the welding performance of pipeline steels is microalloying [2][3][4][5][6][7]. For example, adding Ti [2,3], adding Nb [4][5][6], adding Mo and Cr [7], etc.…”

Section: Introductionmentioning

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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“…Therefore, the chemical composition of the steel plays an important role in affecting the mechanical properties of HAZ and steel pipe. Although many lab research works have reported the effect of alloy elements on mechanical properties of HAZ of X80 steel, they mainly focused on the toughness of the coarse grain HAZ (CGHAZ) [15,16]. Meanwhile, because the HAZ along fusion line of steel pipe is very narrow, the sample of HAZ for the impact test may include other zones such as fine grain HAZ (FGHAZ), intercritical HAZ (ICHAZ), and even base metal (BM), which may affect the impact energy of HAZ of steel pipe.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of High-Nb X80 Steel Weld Pipes for the Second West-to-East Gas Transmission Pipeline Project

Qiao

Chen

Zhang

et al. 2017

Advances in Materials Science and Engineering

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The mechanical properties of steel pipe have great effects on the integrality and operation safety of gas transmission pipeline. In order to reduce the cost of the steel pipe, the high-Nb X80 pipeline steels with the different alloying systems have been used in the Second West-to-East Gas Transmission Pipeline Project. Nevertheless, an investigation into the effects of chemical composition on the mechanical properties of steel pipes is lacking. In this work, the chemical composition and mechanical properties of high-Nb X80 grade steel pipes with a diameter of 1,219 mm and a wall thickness of 22 mm, which are coiled by steels manufactured by three mills, have been analyzed. Furthermore, the effects of chemical composition of the steels on the mechanical properties of the pipe body and weld joint were discussed.

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Effect of alloy design on improving toughness for X70 steel during welding

Cited by 31 publications

References 32 publications

Microstructure and Mechanical Characterization of X70 Steel Welded Joints Through Hardness Mapping and Tensile Strength Testing

Microstructure and Mechanical Characterization of X70 Steel Welded Joints Through Hardness Mapping and Tensile Strength Testing

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

Mechanical Properties of High-Nb X80 Steel Weld Pipes for the Second West-to-East Gas Transmission Pipeline Project

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