Effect of Mg and Ca on the Characteristics of Inclusions in Sulphur Steel

• Autorzy: Tian J. , Qu T. , Wang D. , Wang H. , Xu Z. , Xinrui E.

Identyfikatory

DOI

10.24425/amm.2018.125083

• Języki publikacji: EN

Abstrakty

EN

The effects of Mg and Ca on sulfide modification of sulphur steel were studied to elucidate the difference between micromagnesium treatment and micro-calcium treatment for the inclusion of sulphur steel. The results show that the inclusions in the steel appeared with an oxide core of Al₂O₃ and MnS wrapped. After the addition of Mg, the core was changed to spinel, and the MnS coating was changed to Mn-Mg-S. After Ca was added, the core was changed to Ca-Al-O, and the MnS coating was changed to Mn-Ca-S. The Mg content was higher than Ca content in the sulfides of the steel. Therefore, Mg was more effective than Ca in terms of sulfide modification with the same content of Mg and Ca in steel, but the yielding rate of Mg was lower than that of Ca. The Mg content in the oxide core was higher than Mg of the coating of the inclusions in the steel treated with Mg or Mg-Ca. In contrast, the Ca content in the oxide core was lower than Ca of the coating of the inclusions in the steel treated with Ca or Mg-Ca. MnS formed and precipitated during the melt solidification process. The complex sulfide (Mg-Mn-S) was precipitated around MgO·Al₂O₃ in the Mg treated steel during the cooling process. CaS inclusion was precipitated on the CaO·Al₂O₃ inclusions in the liquid Ca-treated steel. Thus, CaS was formed first, whereas MnS was formed during the cooling process, followed by the formation of complex sulfide (CaS+MnS), which finally precipitated around CaO·Al₂O₃ in the Ca-treated steel.

Słowa kluczowe

EN

Mg treatment; Ca treatment; MnS; complex sulfide; inclusions

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2018
• Tom: Vol. 63, iss. 4
• Strony: 1599--1607
• Opis fizyczny: Bibliogr. 36 poz., rys. tab., wzory

Twórcy

autor

Tian J.

• Soochow University, Shagang School of Iron and Steel, Suzhou 215021, PR China

autor

Qu T.

• Soochow University, Shagang School of Iron and Steel, Suzhou 215021, PR China

autor

Wang D.

• Soochow University, Shagang School of Iron and Steel, Suzhou 215021, PR China

autor

Wang H.

• Soochow University, Shagang School of Iron and Steel, Suzhou 215021, PR China

autor

Xu Z.

• Soochow University, Shagang School of Iron and Steel, Suzhou 215021, PR China

autor

Xinrui E.

• Soochow University, Shagang School of Iron and Steel, Suzhou 215021, PR China

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Uwagi

EN

1. The authors wish to express their application to the National Natural Science Foundation of China (No. 51704200, No. 51674172) and Jiangsu province Natural Science Fund (BK20150336, BK20150334) for providing financial support which enabled this study to be carried out.

PL

2. Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).