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首页> 外文会议>63rd World Foundry Congress Sep 12-18, 1998 Budapest, Hungary >OXIDATIVE REMELTS OF HADFIELD STEEL AND THEIR EFFECTT ON THE QUALITY OF CASTINGS
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OXIDATIVE REMELTS OF HADFIELD STEEL AND THEIR EFFECTT ON THE QUALITY OF CASTINGS

机译：硬质合金的氧化结果及其对铸件质量的影响

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摘要

The technology using oxygen-blowing into the bath has been elaborated to decrease gas content in remelted Hadfield steel scrap. This technology was tested and described by means of twenty melts with special respect to blowing conditions and suppressing the formation of gas holes in the castings. It was estimated: Using the remelting technology described in the paper, blowing of oxygen can be used to reduce C content by a mean 0,051 wt.%. When 0,1 wt.% C is removed, 0.024 wt.% N and 2.9 wt.ppm H are removed from the bath under the given conditions. If this technology is used, including addition of 1.5 kg.t~(-1) FeTi 35%, nitrogen gas holes in Hadfield steel castings are safely eliminated and the final content of nitrogen and hydrogen in castings are (250+-72) wt.ppm and (5.5+-1.0) wt.ppm, respectively. Oxygen-blown melts (remelted) have a critical nitrogen content limit around 400 wt.ppm, and a corresponding hydrogen content limit around 8 wt.ppm, for the occurrence of the gas holes in Hadfield steel castings.
机译：精心设计了将氧气吹入熔池的技术，以减少重熔哈德菲尔德废钢中的气体含量。通过对二十种熔体进行了测试和描述，特别考虑了吹塑条件并抑制了铸件中气孔的形成。据估计：使用本文所述的重熔技术，吹氧可用于将C含量平均降低0.051 wt。％。当除去0.1重量％的C时，在给定条件下从浴中除去0.024重量％的N和2.9重量ppm的H。如果使用此技术（包括添加1.5 kg.t〜（-1）35％的FeTi），则可以安全地消除哈德菲尔德钢铸件中的氮气孔，铸件中氮和氢的最终含量为（250 + -72）wt ppm和（5.5 + -1.0）wt.ppm。由于在哈德菲尔德钢铸件中出现气孔，氧气吹塑熔体（重熔）的临界氮含量极限约为400 wt.ppm，相应的氢含量极限约为8 wt.ppm。

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