Market-wide shifts in steel wire rope quality: A 25-year statistical analysis following the EN 12385 transition
Abstract
Steel wire rope quality is fundamentally linked to the mechanical properties of its constituent wires, with the tensile strength dispersion being a critical parameter for operational reliability and service life. This paper investigates the impact of transitioning from older, stricter national standards (STN/ČSN, DIN) to the European EN 12385 standard series on the actual quality of supplied ropes. A dataset of 111 steel ropes, destructively tested between the years 2000 and 2025, was analyzed. The evaluation focused on the relative proportion of ropes meeting various strength dispersion criteria (-5%/+5%, -10%/+10%, and EN criteria) across two normative periods: pre-EN (2000–2008) and post-EN (2009–2025). Utilizing Fisher's exact test for statistical validation, the study confirms a highly significant decline in the proportion of high-quality ropes following the adoption of the more benevolent EN 12385 standard. Specifically, the share of ropes meeting the strictest (-5%/+5%) dispersion tolerance dropped significantly from 52.9% to 29.3% (p = 0.019). The findings provide exact evidence that relaxed normative requirements have negatively affected the qualitative parameters of wire ropes available on the market, prompting a necessary discussion on stricter customer purchasing specifications.
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