Calcium modifies the shape of sulfide inclusions at low sulfur levels, making them more globular and, hence, reducing the detrimental effect of sulfur on ductility and toughness.

Calcium is rarely used as a deoxidizer in its own right as it is more expensive than other deoxidizers but is used to modify alumina inclusions to a molten calcium aluminate phase which prevents nozzle blockage by alumina. Calcium modification of inclusion composition and morphology also enhances machinability.

See Also

References

  • Turkdogan, ET,  Fundamentals of Steelmaking, The Institute of Materials, 1 86125 004 5 Book icon
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