Steel sheet pile is made using either cold formed or hot rolled manufacturing processes, and the process used determines the type of interlock. With hot-rolled piles, the steel is produced at a high temperature, and this results in a tight interlock. The cold-formed method, in contrast, created a looser interlock, and this is of importance. Walls requiring low permeability and those to be used in hard driving conditions need to be of the hot rolled variety to withstand the surrounding conditions. This is the major difference between the two options.
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