Some Mechanical Characteristics of Structural Steels of Cooling Systems of Continuous Operation

Investigation of the relationship between the strength limit and the long time fatigue of steel reinforcements of reinforced concrete structures

“…It is believed that steel loses its visco-plastic characteristics at a hydrogen content in the range of 7…12 cm 3 /100g [8]. However, as established in [9], hydrogen fragility can occur with a small amount of absorption (absorbed) hydrogen. Thus, in steel with a tensile strength of 1600 MPa, doped with 0.7% Cu, 0.25% Mo, 0.8% Nb and 0.025% Al, a decrease in plastic properties (δ) was observed from 45 to 3% at the level of flooding 0.03 cm 3 /100g.…”

“…It is known from the literature that microcracks form atomically pure surfaces on which hydrogen released from dislocations is chemisorbed. Thermodynamic calculations using the Gibbs equation show [2,4] that hydrogen adsorption sharply reduces surface energy, especially at low concentrations on the surface 6.0…7.5 J/cm 2 [9]). If you take into account the actual energy consumption for the destruction of iron (≈10…20 J/cm 2 ), such a change will be very sensitive.…”