Abstract
A statistical investigation was made relating to the brittle fracture arrest properties of various steel plates for ship and bridge structures, low-temperature storage tanks and pressure vessels. Fracture arrest toughness ( K a ) data obtained by means of the temperature gradient type of ESSO tests on around 200 steel plates were collected and analyzed. It was found that K a transition curves in terms of temperature for a set of steel plates possessed a ‘pivot’ on the temperature versus K a diagram when the data were grouped according to their chemical composition and production methods. It was also found that this pivot is moved to lower temperatures or to higher K a directions following the application of production processes and selection of the chemical composition such as the following: normalizing heat treatment; quenching and tempering heat treatment; rolling at intercritical temperature; reduction in carbon content and increase in nickel content. It was also found that the new production method of Thermomechanically Controlled Process (TMCP) for plate rolling provides an effective measure to improve the fracture arrest properties of steel plates.
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