Against the backdrop of escalating geopolitical tensions, the global scrap nickel supply network (GSNSN) faces mounting challenges to its systemic reliability. This paper constructs an analytical framework integrating endogenous structural exposure with cascading failure simulations to assess the structural vulnerability mechanisms of the GSNSN. The results indicate that, from the perspective of endogenous structural exposure, the system exhibits significant characteristics of non-linear abrupt transitions, revealing the structural criticality of the network’s transition from a steady state to a collapse. Regarding external shocks, national import/export bans or disruptions in cooperation generally manifest into four risk propagation modes: long-range & large-scale, long-range & small-scale, short-range & large-scale, and short-range & small-scale. Specifically, high-coupling strategic corridors or nodes constitute the core of vulnerability due to rigid supply-demand dependencies (e.g., GBR→USA, DEU↔SWE, CHN, and USA), whereas nodes with high risk tolerance function as physical firewalls through a threshold dissipation mechanism. The findings emphasize that the governance paradigm for resource supply chains must shift from flow monitoring to topological optimization, suggesting that constructing strategic redundancy is critical for enhancing the resilience of the global supply network.
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