Pearlite-reduced HSLA steels for line pipe

Tither, G.; Lauprecht, W.

doi:10.1007/bf00673544

Cited by 8 publications

(18 citation statements)

References 4 publications

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“…Subsequently, while the nitrogen and sulphur are scavenged, remaining Ti ties up with TiC during coiling. The minimum amount of titanium required for full stabilization, based on a stoichiometric approach, is (Tither & Stuart, 1995):…”

Section: Titanium Stabilized If Steelsmentioning

confidence: 99%

Physical Metallurgy and Drawability of Extra Deep Drawing and Interstitial Free Steels

Banerjee¹

2012

Recrystallization

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Section: Titanium Stabilized If Steelsmentioning

confidence: 99%

Physical Metallurgy and Drawability of Extra Deep Drawing and Interstitial Free Steels

Banerjee¹

2012

Recrystallization

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“…1 Complete dissolution of the microalloying elements can encourage the strain induced precipitation of Nb(C,N) and V(C,N) that are essential for austenite-(c) pancaking and thereby ferrite-(a) grain refinement following thermomechanical controlled rolling (TMCR). [2][3][4] On the other hand, c-grain growth during soaking can seriously hamper the grain refinement in rolling operation. [1][2][3][4][5] Austenite grain growth occurs during soaking either by normal grain growth (NGG) or by abnormal grain growth (AGG).…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4] On the other hand, c-grain growth during soaking can seriously hamper the grain refinement in rolling operation. [1][2][3][4][5] Austenite grain growth occurs during soaking either by normal grain growth (NGG) or by abnormal grain growth (AGG). 6 Pinning force exerted by the undissolved microalloy precipitates can certainly restrict the c-grain growth, however, coarsening or dissolution of those precipitates may promote the AGG in HSLA steels.…”

Section: Introductionmentioning

confidence: 99%

“…[7][8][9][10] AGG is characterised by the rapid increase in size of the larger grains at a rate much faster than NGG. [1][2][3][4][5] Development of abnormally large c grains at the soaking stage may result in the formation of coarse agrains, which seriously hamper the low temperature toughness of the rolled plate. 11,12 Rolled plates/strips are welded for making structural components in construction, defence, naval, engineering, automotive, and energy sectors.…”

Section: Introductionmentioning

confidence: 99%

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Effect of starting microstructure on austenite grain sizes developed after reheating of HSLA steel

Roy

Karmakar

Mukherjee

et al. 2014

Materials Science and Technology

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Austenite grain structure has been studied over a wide range of soaking temperatures (950–1250°C) in a high strength low alloy steel containing Nb, Ti and V for different starting conditions, namely as cast, hot rolled and thermomechanical controlled rolled. Mixed (or bimodal) austenite grain structures were developed as a result of abnormal grain growth at different soaking temperatures in as cast slab (∼1200°C) and in rolled plates (∼1000°C), which has hardly been reported earlier. Higher fraction of finer precipitates, such as NbC and VC (<200 nm in size), were present in the rolled plate as compared to as cast slab, where the precipitates were coarser and complex in nature. Rapid dissolution of fine VC precipitates was primarily responsible for the observed abnormal grain growth in rolled plates at lower soaking temperature (∼1000°C). Coarse precipitates of complex nature, such as (Nb,Ti,V)(C,N) and (Nb,Ti)(C,N), remained stable up to ∼1150°C and restricted the formation of abnormal grain growth in as cast steel.

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“…Microstructures composed of ferrite and pearlite were also obtained after thermomechanical treatments of microalloyed steels. For microalloyed steels of different compositions, Tither et al (1977) obtained, after homogenization at 1230 °C and several hot rolling passes, a microstructure constitued of ferrite and degenerate pearlite, which they also called bainite. Arámburo et al (2014) and Bakshi et al (2019) also observed a similar microstructure in API X70 steel processed by controlled rolling.…”

Section: Annealed Conditionmentioning

confidence: 99%

Microstructure and mechanical properties of as-cast and annealed high strength low alloy steel

Oliveira¹,

Oliveira²,

Terrones³

et al. 2019

JMSR

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This paper presents a study on the microstructure and mechanical properties of a microalloyed HSLA steel solidified by continuous casting process and annealed at 1100 °C for 1 hour. The techniques of confocal microscopy, scanning electron microscopy and hardness, tensile and Charpy mechanical tests were used. The results of this research showed that the microstructure of the sample in the as-received condition was mainly composed of acicular ferrite and aggregates of ferrite and carbides. Non-metallic inclusion characterization of as-cast steel showed that calcium content was not enough to modify the morphology of some aluminates. After thermal treatment, the initial microstructure was transformed into polygonal ferrite and pearlite. In both conditions, different types of precipitates were found, which were classified according to their distribution in the microstructure. The steel with solidification structure showed a higher tensile strength, but its application would be unlikely in components that require good impact strength.

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Pearlite-reduced HSLA steels for line pipe

Cited by 8 publications

References 4 publications

Physical Metallurgy and Drawability of Extra Deep Drawing and Interstitial Free Steels

Physical Metallurgy and Drawability of Extra Deep Drawing and Interstitial Free Steels

Effect of starting microstructure on austenite grain sizes developed after reheating of HSLA steel

Microstructure and mechanical properties of as-cast and annealed high strength low alloy steel

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