"Niobium Micro-Alloyed High Carbon Steel Wires ; Innovative Solution for Bridges & Infrastructure "

oleh "David D Jarreta † "

Penerbit - "CBMM Technology Suisse S.A., Geneva, Switzerland & Metal Prime Technology Pte Ltd, Singapore "

Kategori - Kejuruteraan & IT

"Since the erection of the first modern cable-stayed bridge in 1956 in Sweden structural engineers have always looked for improved material performance, especially for the steel wire rod. This type of long-span bridge is increasing in popularity across the world and in particular in South East Asia and China. The world’s longest cable-stay bridge is the 10 km (main span) JaiShao Bridge, completed in 2013 in China. In general, the steel used for stay-cables and pre-stressed concrete is characterised by its high carbon content which imparts tensile strengths nearing 1,800 MPa, however, this high carbon approach negatively impacts the desired elongation. This paper presents and provides metallurgical analysis on experimental data demonstrating that microalloying using niobium imparts significant microstructural refinement of high carbon steel wire rods; effectively reducing pearlite colony size and inter-lamellar spacing (). This refinement not only leads to improvements in strength allowing for example, light-weighting of cables, but moreover and importantly improvements in ductility, %RA, and drawability for cold drawn wire. The overriding conclusion is that through very small additions of niobium to high carbon steel wire rod, notable product and operational cost benefits can be created for steelmakers, rod and wire rope producers generating improved productivity and quality in the cold drawing process and better final performance of the strand in applications such as wire rope for cable-stayed bridges. "

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