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Microstructural parameters, impact strength, and DWTT properties of coil steel X70 are governed to a considerable degree by a sufficiently high temperature for the start of rolling in 2000 mill finish stands (Tsfr). Results are provided for a study of steel microstructure in relation to cold brittleness threshold during DWTT (T90) and proportion of bainitic ferrite on Tsfr. Rolling with Tsfr close...
The effect of controlled rolling and accelerated cooling production parameters on the structure and properties of plates 25 mm thick or more of strength category X70 is studied. A change is shown for the proportion of structural components in steel X70 with a ferrite-bainite microstructure in relation to CR regime. The presence in the steel microstructure of areas of bainitic ferrite, forming at the...
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