Mechanism of Interfacial Reactions Between Type 430 Stainless Steel and Complex MgO–Al2O3–SiO2–CaO–MnO Oxide During Isothermal Heating

To quantitatively study the mechanism of interfacial reactions between type 430 stainless steel and complex MgO–Al2O3–SiO2–CaO–MnO oxide during soaking process before hot-rolling, diffusion couple experiments at 1373 K 1673 (1100 °C 1400 °C) with different MnO SiO2 contents were conducted. Experimental results showed that “solid–liquid” “solid–solid” steel–oxide occurred Cr, Mn Si in heating °C), respectively, resulting a change compositions. Calculations on Gibbs free energy changes those after isothermal indicated thermodynamic equilibrium interface generally achieved for 240 min. Diffusion coefficients related elements calculated: Mn, (1400 are range 1.44 to 3.40 × 10–12, 0.42 1.19 10–11 0.52 1.34 m2 m?1, while 0.80 3.71 10?13 1.04 5.64 s?1, respectively.