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Sumitomo Introduces Corrosion-Resistant Steel for Lower-Maintenance Bridges
05/24/2011 - Sumitomo Metal Industries, Ltd. has developed a new corrosion-resistant steel with tin that can be used in salt-containing environments, such as at the seaside or in cold climates where anti-freezing agents are sprayed.
Sumitomo Metal Industries, Ltd. has developed a new corrosion-resistant steel with tin that can be used in salt-containing environments, such as at the seaside or in cold climates where anti-freezing agents are sprayed.
Steel bridges are typically painted for rust prevention, and must be repainted regularly to prevent the spread of rust from scratches or chips in the paint. Sumitomo Metals studied the mechanism corrosion of the steel coating in high salt-containing environments and discovered that adding a trace of tin (Sn) can significantly improve corrosion resistance, and that this effect can be produced even if rust cannot be removed sufficiently during the repainting work. Based on this discovery, the company developed a new corrosion-resistant steel with tin that also exceeds basic performance properties such as strength and weldability of conventional steels.
Bridges made of this new steel is expected to lengthen the intervals between repaints and reduce repainting workload. Lengthening the intervals between repaints will result in reduced maintenance and management costs for bridges.
