High-strength steel material having enhanced resistance to brittle crack propagation and break initiation at low temperature and method for manufacturing same
A high-strength steel, low-temperature technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems that it is difficult to fully ensure the fracture initiation resistance and fracture propagation resistance, and achieve the effect of improving fracture propagation resistance and fracture initiation resistance
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[0126] In the following description, example embodiments of the present disclosure will be described in more detail. It should be noted that the exemplary embodiments are provided to describe the present disclosure in more detail, not to limit the present disclosure.
[0127] Slabs having compositions as shown in Table 1 below were heated, hot rolled and cooled under the conditions listed in Table 2 below, and steel samples were produced.
[0128] The microstructures of the manufactured steel samples were observed, properties were measured, and the results are listed in Table 3 below.
[0129]In addition, the fabricated steel specimens were welded with the welding heat input listed in Table 2 below, and the impact energy value (-60°C) and CTOD value (-40°C) of the welding heat-affected zone (SCHAZ) were determined by The measurements are listed in Table 3 below. Since the impact energy value (-60°C) and CTOD value (-40°C) of the steel sample are higher than the impact energy...
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