Contamination with tramp elements is a major concern in steel recycling. This study aimed to identify the influence of impurity elements on the major properties of carbon steel. The content of impurity elements in recycled steel was determined via elemental analysis of randomly sampled steel bars. Of the 23 impurity elements considered, 15 were found to be mixed in the recycled steel. Industrial standards stipulate that the six major properties of carbon steel are tensile strength, elongation, yield point or proof stress, soundness in the welding area, fracture toughness, and bendability. The influence of the fifteen impurity elements on all of these properties except bendability was investigated by reviewing previous academic reports. Properties related to strength and stress were found to be enhanced by the presence of almost any impurity, while elongation and welding soundness were often compromised. The influence of impurities on the other properties remains largely unknown. The negative effects of impurities on the workability and weldability can be minimized by adjusting the steelmaking, casting, and annealing processes, or rethinking the design of products and manufacturing processes. Further, the incorporation of impurities may be prevented during the recovery of steel scrap from end-of-life products. A useful approach to the prevention of the negative influence of impurities is a new concept termed R-PSPP, which stands for recovery, process, structure, property, and performance.

杂物污染是钢铁回收中的主要问题。这项研究旨在确定杂质元素对碳钢主要性能的影响。回收钢中的杂质元素含量是通过对随机取样的钢筋进行元素分析确定的。在考虑的23种杂质元素中，发现15种混入了再生钢中。工业标准规定，碳钢的六个主要性能是拉伸强度，伸长率，屈服点或屈服强度，焊接区域的稳固性，断裂韧性和可弯曲性。通过回顾以前的学术报告，研究了15种杂质元素对所有这些性能（除了可弯曲性）的影响。发现几乎所有杂质都会增强与强度和应力有关的特性，而伸长率和焊接稳健性常常受到损害。杂质对其他性能的影响仍然未知。通过调整炼钢，铸造和退火工艺，或重新考虑产品设计和制造工艺，可以最大程度地减少杂质对可加工性和可焊性的负面影响。此外，可以在从报废产品中回收废钢的过程中防止杂质的掺入。防止杂质负面影响的一种有用方法是称为R-PSPP的新概念，它代表回收率，工艺，结构，性质和性能。通过调整炼钢，铸造和退火工艺，或重新考虑产品设计和制造工艺，可以最大程度地减少杂质对可加工性和可焊性的负面影响。此外，可以在从报废产品中回收废钢的过程中防止杂质的掺入。防止杂质负面影响的一种有用方法是称为R-PSPP的新概念，它代表回收率，工艺，结构，性质和性能。通过调整炼钢，铸造和退火工艺，或重新考虑产品设计和制造工艺，可以最大程度地减少杂质对可加工性和可焊性的负面影响。此外，可以在从报废产品中回收废钢的过程中防止杂质的掺入。防止杂质负面影响的一种有用方法是称为R-PSPP的新概念，它代表回收率，工艺，结构，性质和性能。