Performances of crack resistance
of the tube steel 20 with structure
of the natural ferrit-martensitic composite material
Results of experimental researches about influence of structure of trumpet steel 20 on characteristics of resistance to destruction are resulted. It is shown, that with the purpose of achievement of the greatest possible characteristics of re-sistance it is necessary for destruction to determine dependence of these char-acteristics at a variation of a volume fraction of a strengthening phase and the attitude l/d.