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<p>Nitrogen pickup during air induction melting can result in porosity and a loss of fracture toughness in ultrahigh-strength quenched and tempered steel castings. Nitrogen atoms are easily adsorbed into liquid steel upon exposure to the air, and argon shrouding alone has limited effectiveness. Previous studies have shown that proper charge sequencing and maintaining a high amount of dissolved oxygen in the melt prior to tapping and deoxidation can limit nitrogen pickup in the melt. In the current study, the effect of melt practice and charging procedure on nitrogen pickup was studied as a function of hold time in a series of laboratory scale and commercially produced heats of a Cr-Ni-Mo-containing steel intended for ground engaging equipment. By controlling the melting time, purity of charge materials, and development of a dome shrouding method, the nitrogen content was reduced from 170 ppm to less than 80 ppm.</p>

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Controlling Nitrogen Pickup during Induction Melting of Ultrahigh-Strength Cr-Ni-Mo-V Steels

  • 期刊论文

  • 发表日期：

    2025年7月24日

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  • Kingsley T. Amatanweze,
  • Viraj A. Athavale,
  • Mario F. Buchely,
  • Laura N. Bartlett,
  • Ronald J. O’Malley,
  • Daniel M. Field

摘要

Nitrogen pickup during air induction melting can result in porosity and a loss of fracture toughness in ultrahigh-strength quenched and tempered steel castings. Nitrogen atoms are easily adsorbed into liquid steel upon exposure to the air, and argon shrouding alone has limited effectiveness. Previous studies have shown that proper charge sequencing and maintaining a high amount of dissolved oxygen in the melt prior to tapping and deoxidation can limit nitrogen pickup in the melt. In the current study, the effect of melt practice and charging procedure on nitrogen pickup was studied as a function of hold time in a series of laboratory scale and commercially produced heats of a Cr-Ni-Mo-containing steel intended for ground engaging equipment. By controlling the melting time, purity of charge materials, and development of a dome shrouding method, the nitrogen content was reduced from 170 ppm to less than 80 ppm.