Steel showed a slight tendency to aging and sufficient resistance against corrosion. Due to its great hardness, poor processing and low plasticity, this steel was not used in the designs.
The following use of low alloy steel took place after 10 years in connection with the construction in 1936. Moskvoretsky city bridges and designs of the Palace of Soviets. Acad proposed for this purpose. A. A. Baykov Mark of low -alloy steel, known for us under the name DS (Palace of Soviets), was based on a more complex alloy of the German steel 52.
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In addition, steel had a little molybdenum and titanium. Thus, the chemical composition of steel DS was characterized by a very reduced carbon content, an increased content of manganese and chromium and moderate silicon, nickel and copper. The mechanical characteristics of the steel ds were determined by the complex alloying of numerous components in small doses. The mechanical characteristics should have met the requirements for steel 52, namely, have a strength limit of 50-62 kg/mm2, a fluidity limit of 36 kg/mm2, relative lengthening of more than 20%.
The steel of DS basically satisfied the specified requirements, by the limitation limit due to an increase in the content of manganese above the conditional requirements, and later the increase in nickel. The steel of DS turned out to be very corrosion -resistant steel with good shock viscosity (at a temperature of +20 ° 10-18 kgm/cm2) and a very low threshold of coldnolism (below -60 °). The limit of fatigue of steel ds is quite large Z ± = 28.5 kg/mm2 (when using smooth samples for bending). The sensitivity of the steel “cutting – the limit of fatigue of cut samples is 19 kg/mm2, which gives a decrease by 35%; The limit of corrosion fatigue is approximately 21 kg/mm2 (decrease by 26%). The sensitivity of steel to stick and aging is also relatively small; The shock viscosity during gluing and aging changes less than that of other steels and the threshold of coldness increases very slightly. Thus, in the point of view of dynamic work, the steel of DS had very high indicators.
