Phosphorus Transfer Behaviors Induced by CaF2–TiO2–CaO Fluxes in EH36 Shipbuilding Steel Subject to High Heat Input Submerged Arc Welding

• Published in: Metallurgical and materials transactions. B, Process metallurgy and materials processing science Vol. 53; no. 5; pp. 2774 - 2778
• Main Authors: Zhong, Ming, Li, Tao, Basu, Somnath, Wang, Zhanjun, Wang, Cong
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.10.2022; Springer Nature B.V
• Subjects: Arc heating; Behavior; Brief Communication; Calcium fluoride; Characterization and Evaluation of Materials; Chemistry and Materials Science; Decomposition; Dephosphorizing; Electrodes; Fluorides; Fluxes; Heat; High strength steels; Investigations; Materials Science; Metallic Materials; Metallurgy; Nanotechnology; Phosphorus; Phosphorus pentoxide; Shipbuilding; Steel; Structural Materials; Structural steels; Submerged arc welding; Surfaces and Interfaces; Thin Films; Titanium dioxide; Weld metal
• ISSN: 1073-5615; 1543-1916
• DOI: 10.1007/s11663-022-02607-1

Phosphorus transfer behavior has been systematically investigated by submerged arc welding of EH36 shipbuilding steel with CaF 2 –TiO 2 –CaO fluxes. Dephosphorization could be induced when the CaO content is higher than 15.7 mass pct; otherwise, phosphorus uptake may occur. Coupling actual welding process with thermodynamic calculations, it is found that the major driving force enabling phosphorus transfer is largely governed by the activity difference between hypothetical P 2 O 5 in the flux and that equilibrated with the weld metal.