To optimize the composition and morphology of inclusions in 55SiCrA spring steel, the effect of CaO and SiO2 contents on the low melting point zone of CaO- SiO2- Al2O3- MgO and CaO- SiO2- Al2O3- MnO inclusions was studied by thermodynamic software Factsage. The results show that with increasing CaO and SiO2 content, the area percentage of low melting point inclusions of CaO- SiO2- Al2O3- MnO system increases. The CaO- SiO2- Al2O3- MgO system has the maximum area of low melting point inclusions when CaO and SiO2 contents are 40 mass% and 50 mass%, respectively. Meanwhile, the effect of refining slag with different basicities on inclusion composition of spring steel was investigated. The results show that with increasing basicity of the refining slag, the Al2O3 content in inclusion increases under the condition of the same Al2O3 content in slag, and its composition gradually deviates from the low melting point zone. Plastic inclusion with low melting point can be obtained when the Al2O3 content in refining slag is 8 mass%, and the basicity is 12 And the morphology of the plastic inclusion appears spherical which size is below 5μm.
Key words
spring steel /
refining slag basicity /
inclusion /
low melting point area
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Footnotes
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