Abstract
High stress resistant steel can be obtained by quenching. The efficiency of the process depends on the thickness of the steel. The thinner the material, the more efficient the process becomes. As a consequence, quenching is equally efficient on a wire as on a somewhat thinner, but wider steel strip. Such high-tensile strip exists commercially and is available from different mills. The range of thicknesses and widths varies with the supplier, but 0.04 in. by 10 in. wide strip (0.1 x 25 cm.) is very common, sold in more than 1500-ft. (450 m.) coils. Ultimate stress is above 200,000 psi (14,000 kg./sq.cm.) and ultimate elongation is more than 2.5 percent. Elastic limit is higher than 160,000 psi (11,300 kg./sq.cm.). The advantage of a steel strip post-tensioning system lies in simplified construction due to simple anchoring devices and in easy tensioning techniques. The system promises to offer advantages especially for the construction of pressure vessels where prestressing forces are very large.
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