Type 7 inclusion in steel with 0.38C-5.29Cr-0.94V

Type 7 inclusion in steel with 0.38C-5.29Cr-0.94V

Figure 1: Type 7 inclusion, SEM, scale bar: 10 µm and X-ray maps for Mg, Al, Si, Ca, Fe and Ba.

Inclusion name: Oxide inclusion
Record No.: 466
Inclusion formula: No data
Inclusion type (Macro/Micro/Nano): Micro
Inclusion type (Exogenous/Indigenous): Indigenous
Inclusion classification: Oxide
Inclusion composition in weight %: No data
Sample: Steel
Steel composition in weight %: 0.38% C, 1.06% Si, 0.43% Mn, 0.019% P, 0.0006% S, 5.29% Cr, 0.13% Ni, 0.048% Co, 0.94% V, 0.011% Al, 0.007% N, 0.0001% B, 0.0004% Ca, 0.00028% O. Slag composition: Before vacuum treatment: 10.3% MgO, 23.7% Al2O3, 13.8% SiO2, 50.1% CaO. After vacuum treatment: 10.4% MgO, 27.1% Al2O3, 12.1% SiO2, 47.1% CaO.
Note: Similarly, the micrographs of a BaO containing inclusion (also Type 7) found in the second heat of the first series (Heat_S1_2) are presented in Fig. 1. While the BaO content is lower than the inclusion No. 464, its presence in the inclusion is evidently seen or the composition ranges of inclusions found at various stages, please clik this link.
Note 2: The tracer experiments were conducted in the full scale ladle. BaCO3 was employed as the raw material of the tracer. At steelmaking temperature, the barium carbonate would decompose immediately into BaO and CO2.
Reference: Not shown in this demo version.