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NanoSteel product selected by Trimay for Canadian slick line project

The NanoSteel Co’s Super Hard Steel (SHS) weld alloy has been selected by Trimay Wear Plate to provide wear protection within the steel piping of a concrete slick line at an underground mine in northern Canada. NanoSteel’s wear performance has been shown to provide a 30x wear rate improvement over the previous solution. Combined with Trimay’s casing design, this project represents the second line of identical configuration for the customer and will be installed during the March quarter of 2014.

The slick line is a 600m vertical borehole system of 24.5cm diameter casing used for delivering concrete to backfill mined out sections and reinforce rock walls so the next ore body segment can be mined safely. It consists of NanoSteel clad API L80 grade steel casing and Trimay’s proprietary threaded joint system.

In its initial installation, thickness loss for the NanoSteel cladding was measured at 0.9mm, after delivering 120,000m3 (288,000t) of concrete over 30 months of service. With this demonstrated wear rate of 320,000t delivered per millimetre of thickness loss, the coated pipe has provided a 30x improvement over the previous solution – an uncoated API L80 bare casing with a wear rate of 10,500t/mm. Service life for the system is projected to achieve full life of mine duration, exceeding 19 years.

Tom Santos, vice president and general manager of coatings at the NanoSteel Co, said: “The high hardness and toughness properties provided by our weld overlay result in the improved wear performance for this application. Because of this, a slick line clad with our material eliminates several replacement cycles for a life of mine solution.”

Doug Fraser, general manager at Trimay, added: “For this vertical slick line application, Trimay’s casing design provides significant time and cost savings at installation. Compared to casing lines with welded flange connections, our threaded joint system connected by a zero-differential coupling can be fitted in the field more than 70x faster and allow a smaller diameter borehole to be drilled at a lower cost.”

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