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Limited quantity and quality of steel supply in a zero-emission future

机译：零排放未来钢铁供应数量和质量有限

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摘要

Achieving a zero-emission future depends greatly on how steel production is decarbonized within a limited time frame. Here we show that the production of zero-emission steel is possible but that the quantity and quality of steel may be limited by scrap downcycling. Using Japan as a case study, our analysis shows that most steel scrap is currently downcycled into construction materials, thereby limiting scrap-based steel to only 20% of the total steel used for automobiles, compared to 60% for buildings. Under a strict carbon budget, such downcycling practices could limit the production of steel used for automobiles to similar to 40% of current levels by 2050, even if production technology progresses according to the roadmap. The results indicate that steel users should not take the current level of steel supply for granted in a zero-emission future. Decarbonizing the steel sector, therefore, will depend not only on stand-alone efforts by the steel industry but on joint action with steel users to enable scrap upcycling and service provision with less steel use.
机译：实现零排放的未来取决于很大在钢铁生产中的脱碳有限的时间框架。钢铁生产零排放是可能的。但钢的数量和质量废时间的限制。案例研究中,我们的分析表明,大多数钢材目前时间转变为建设材料,从而限制scrap-based钢只有20%的总钢用于汽车、相比60%的建筑。碳预算,这些时间你实践限制钢铁的生产用途汽车到类似于目前水平的40%到2050年,即使生产技术的进展根据路线图。不应该把当前,钢铁用户水平的钢铁供应是理所当然的零排放的未来。部门,因此,不仅取决于钢铁行业,而是独立的努力与钢铁用户联合行动,使废升级改造和服务提供更少的钢使用。

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