Mechanism of Grooving Corrosion Resistance in Cu-Ti Added High Frequency Electric Resistance Welded Steel Pipes

Hara, Takuya; Uemori, Ryuzi; Tamehiro, Hiroshi; Kato, Chuichi

doi:10.3323/jcorr1991.49.150

Cited by 6 publications

(4 citation statements)

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“…It has also been suggested 23) that the inclusion "shells" are a feature of weld metal inclusions when the copper content exceeds approximately 0.05 %, and that the oxide or silicate inclusion cores act as favorable sites for sulfide precipitation. Hara 38) reported that MnS was overall covered with Cu 1.6 S precipitates in a welded joint of Cu-Ti added steel. The grooving corrosion resistance of the welded portion was improved by preventing MnS itself from dissolving for the environment due to the formation of shell-like Cu 1.6 S.…”

Section: Figures 7(b)-7(d)mentioning

confidence: 99%

Morphology Control of Copper Sulfide in Strip Casting of Low Carbon Steel

et al. 2006

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Copper and sulfur are the typical residual elements and impurities in steel. Previously, we reported the precipitation of very fine particles of Cu 2 S in copper and sulfur containing steel by strip casting process. In the present paper, the morphologies of copper sulfides in strip casting low carbon steels were distinguishably investigated by Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM).Four kinds of copper sulfide with different morphology were observed, namely duplex inclusion of oxide and sulfide (OS), plate-like copper sulfide (PS), shell-like copper sulfide surrounding the inclusions (SS), and nano-scale copper sulfide (NS), and their formation mechanisms were discussed.The OS is considered to firstly form as molten manganese silicate in molten steel, and grow up with the formation of sulfide inside of the silicate after the solidification of steel. The PS is considered to precipitate from the g-Fe phase with plate-like shape due to semicoherency with the g-Fe matrix. The SS is considered to precipitate in lower temperature ranges on the other pre-formed inclusions such as MnS, oxide and also Cu 2Ϫx S. The NS is considered to form in the low temperature range of g-Fe and especially in a-Fe phase as very fine particles due to the high supersaturation, low diffusivity of component elements and the coherency with the a-Fe matrix.Based on this classification, formation stage of oxide, MnS and Cu 2 S was clarified and described as like TTT diagram.

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Section: Figures 7(b)-7(d)mentioning

confidence: 99%

Morphology Control of Copper Sulfide in Strip Casting of Low Carbon Steel

et al. 2006

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“…It has also been suggested 27 that the inclusion “shells“ are a feature of weld metal inclusions when the copper content exceeds approximately 0.05%, and that the oxide or silicate inclusion cores act as favorable sites for sulfide precipitation. Hara 28 reported that MnS was overall covered with Cu 1.6 S precipitates in a welded joint of Cu‐Ti added steel. The grooving corrosion resistance of the welded portion was improved by preventing MnS itself from dissolving for the environment due to the formation of shell‐like Cu 1.6 S. In contrast with the f.c.c.…”

Section: Resultsmentioning

confidence: 99%

Precipitation of Copper Sulfide and its effect on the Microstructure and Properties of Steel

Liu¹,

Kuwabara²,

Li³

et al. 2011

steel research int.

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The precipitation behavior of copper sulfides in strip cast and isothermal heat treated low carbon steel were investigated by SEM and TEM. The copper sulfides were classified as duplex inclusion of oxide and sulfide (OS), plate-like copper sulfide (PS), shell-like copper sulfide (SS), and nano-scale copper sulfide (NS). Based on the experimental results, the formation mechanisms of these copper sulfides, as well as the effects of cooling rate and constituentes of steel on the competitive precipitation between copper sulfide and manganese sulfide were discussed. The effects of coppers sulfides on the mechanical properties as well as the formation of acicular ferrite in steel were also introduced.

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“…6) They were also expected to improve the corrosion resistance of steel. 7) In order to control the formation of MnS-CuS 0.5 inclusion in solid steel, it is necessary to know the thermodynamic properties of the MnS-CuS 0.5 binary system. Because no literature related to these properties has been reported, the phase diagram and the activities of each component in the liquid phase at 1 473 K were investigated in the present work.…”

Section: ) If Coppermentioning

confidence: 99%

Thermodynamic Properties of the MnS^|^ndash;CuS0.5 Binary System

et al. 2012

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In order to discuss the formation of MnS-CuS0.5 inclusion in γ-Fe, the phase diagram of the MnS-CuS0.5 binary system has been determined by using a confocal scanning laser microscope (CSLM) and a chemical equilibration technique. In addition, the activities of MnS and CuS0.5 in the liquid phase at 1 473 K were investigated by chemical equilibration with molten Cu. The phase diagram of the binary system was found to be of a eutectic type with mutual solid solubility between MnS and CuS0.5. The activities of MnS and CuS0.5 showed positive deviation from the ideality. Finally, the solid steel composition equilibrated with the inclusion was estimated by using the determined thermodynamic properties.

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Mechanism of Grooving Corrosion Resistance in Cu-Ti Added High Frequency Electric Resistance Welded Steel Pipes

Cited by 6 publications

References 0 publications

Morphology Control of Copper Sulfide in Strip Casting of Low Carbon Steel

Morphology Control of Copper Sulfide in Strip Casting of Low Carbon Steel

Precipitation of Copper Sulfide and its effect on the Microstructure and Properties of Steel

Thermodynamic Properties of the MnS^|^ndash;CuS0.5 Binary System

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