Corrosion-mechanical tests of pipe steel specimens in the presence of organosilanes have been carried out and the effect of the latter on steel cracking resistance under slow strain in NS-4 simulated underfilm electrolyte (рН 6.7), both without and with addition of sulfides, has been determined. It has been shown that organosilanes increase the crack resistance of steel, including that in sulfide-containing media. Comparative laboratory tests have been performed for adhesive strength, water resistance, and resistance to cathodic disbonding of adhesive bonds obtained by the existing technology of pipeline insulation under field conditions and using new methods for pipe surface treatment. It has been found that addition of organosilanes improves the adhesive characteristics of a bitumen-polymeric coating on pipe steel.