Abstract
The effect of liquation through the cross section of rolled sheet and the properties of ferrite-bainite high strength pipe steels of categories Kh70 and Kh80 are studied. Auger electron spectroscopy reveals features of carbon and manganese distribution through a sheet cross section. x-Ray photoelectron spectroscopy is used to study the change in manganese distribution between component phases through a sheet cross section of steels Kh70 and Kh80. The effect of liquation on the microstructure of these steels and the change in position of critical points on TTT and CCT curves is determined. A connection is determined between the dispersion of cementite and bainite colonies and steel hardness. It is shown that the strength of steel Kh70 is determined by dispersion hardening of bainite, and in steel Kh80 strength is determined to a considerable degree by strain hardening.
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