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Feasibility of Solid-state Steelmaking from Cast Iron

机译：铸铁固态炼钢的可行性

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To meet the unprecedented demand of environmental issues and tightened production cost, steel industry must develop the disruptively innovative process. In the present study, totally new steelmaking process of ‘Solid State Steelmaking’ (or S~(3) process) without BOF process or liquid state oxidation process is proposed. The overview of the new process is as follows: (1) High carbon liquid iron from the ironmaking processes is directly solidified by using a strip casting process to produce high carbon thin sheets. (2) Then, the produced cast iron sheet is decarburized by introducing oxidizing gas of H_(2)O or CO_(2) in a continuous annealing line to produce low carbon steel sheets. The most beneficial aspect of the S~(3) process is the elimination of several steps such as BOF, and secondary refinement processes and no formation of inclusions. To investigate the feasibility of S~(3) process, the cast iron strips with various high carbon content produced by a centrifugal slip casting method are decarburized at 1248 K and 1373 K by using H_(2)O–H_(2) gas mixture and its kinetics of the decarburization is investigated. In the decarburization process, the carbon diffusion through the decarburized austenite phase but not the decomposition of cementite is the rate controlling step of the decarburizing process. It is found that 0.5 mass% C sheets can be produced from 3.89 mass% C sheets with the thickness of 1.0 mm within 30 min at 1373 K. Based on these results, S~(3) process is confirmed to be feasible as an alternative low cost steelmaking process although the further improvement of the process will be necessary.
机译：为了满足对环境问题的空前需求和严格的生产成本，钢铁行业必须开发具有破坏性的创新工艺。在本研究中，提出了一种全新的“固态炼钢”（或S〜（3）工艺）炼钢工艺，而没有BOF工艺或液态氧化工艺。新工艺概述如下：（1）炼铁工艺中的高碳液态铁通过带钢铸造工艺直接固化以生产高碳薄板。 （2）然后，通过在连续退火线中引入H_（2）O或CO_（2）的氧化气体使所生产的铸铁板脱碳，以生产低碳钢板。 S〜（3）过程最有利的方面是消除了多个步骤，例如BOF和二次精炼过程，并且没有形成夹杂物。为了研究S〜（3）工艺的可行性，使用H_（2）O–H_（2）混合气在1248 K和1373 K下对离心滑铸法生产的各种高碳含量铸铁带进行脱碳。并对其脱碳动力学进行了研究。在脱碳过程中，通过脱碳奥氏体相的碳扩散而不是渗碳体的分解是脱碳过程的速率控制步骤。发现在1373 K下30分钟内可以由厚度为1.0 mm的3.89质量％C片生产0.5质量％C片。基于这些结果，证实了S〜（3）工艺是可行的低成本炼钢工艺，但仍需要进一步改进工艺。

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