Magnesium-alumina spinel is easier to be modified into liquid inclusions than alumina. According to Al2O3 MgO-Al2O3 system inclusions CaO-Al2O3-MgO or CaO-, inclusions in steel slag refining process are affected by slag reaction and calcium treatment on the evolution of liquid inclusions. Al2O3 system.
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The results show that under this parameter, the martensite transformation in the casing is basically completed, and the lower bainite is also included in the microstructure, while the lower bainite has high strength and toughness, and the casing will stop producing micro-cracks and restrain its deformation. With expansion, the quenching hardness of the casing can still reach about 48 HRC, which effectively guarantees the quenching quality.


The oil-water alternating quenching method provided in this study can not only reduce the internal stress produced during quenching, but also ensure the simultaneity of martensitic transformation inside and outside the casing, which is conducive to inhibiting the occurrence or expansion of quenching. Cracks.


The modeling and simulation methods of casing provide a theoretical basis for analyzing the temperature and stress fields of casing under different working conditions and actual working conditions, and provide a theoretical basis for further analysis of different specifications, different uses of casing and pipe heat. The treatment process has great reference value.