| Abstrakt: |
The favorable effect of doping with carbonitride-forming elements-vanadium, niobium, and titanium - on the structure and properties of low-pearlite steels subjected to controlled rolling is due to the change of the structural state of hot-deformed austenite, of the temperature range and nature of the γ→α-transformation, of the phase composition of the steel, and of the state of the α-solid solution caused by the alloying with these elements. The ambiguous effect of doping with vanadium, niobium, and titanium on the strength and ductile properties of low-pearlite steel is due to the different degree of dispersion hardening, refinement of the ferrite grain, refinement of the solid solution, the ratio of the structural components, and the nature of the products of the γ→α-transformation. The newly devised economically alloyed low-pearlite steel 09G2FB for gas pipes with large diameter after controlled rolling with deformation at the concluding stage in the biphase γ+α-region has a unique complex of mechanical properties satisfying the stringent requirements concening pipes intended for operation under conditions of the Far North. [ABSTRACT FROM AUTHOR] |
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