Sulfur High Aluminum Gear Steel Continuous Casting Process

[China Aluminum] In recent years, many users of gear steel have proposed lower limits for sulfur content ≥0.015% and [Al] content ≥0.020%. This is to improve the machining performance of steel and ensure the grain size requirements of steel.

gear

This has created a problem for continuous casting. In particular, the billet is prone to nodulation. For this reason, in the refining operation to do a good job of deoxidation, pay attention to the amount of calcium treatment, and pay attention to the order and timing of the feeding line, so as to not only meet the full degeneration of Al2O3, but will not have too much Ca and S reaction to generate CaS. This type of steel in the continuous casting process to be particularly good to prevent the work of secondary oxidation: large package - tundish long nozzle + argon seal, immersed nozzle + black slag surface operation.

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