Steel for heat treatment
A quality and element technology, applied in the field of high-strength and high-toughness heat-treated steel, can solve the problems of difficult heat-treated steel, complicated manufacturing process, and high cost
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[0113] Next, the effects of the present invention will be described by comparing Examples satisfying the requirements of the present invention with Comparative Examples not satisfying the requirements of the present invention.
[0114] First, the alloy composition shown in Table 1 was melted in a small melting furnace, cast, soaked and hot-rolled under the conditions shown in Table 2, and the thickness 16 of Examples 1-22 and Comparative Examples 1-6 were obtained. billet. Quenching and tempering (heat treatment) were performed under the conditions shown in Table 2 using these billets.
[0115] [Table 1]
[0116]
[0117] [Table 2]
[0118]
[0119] For the steel slabs of Examples 1 to 22 and Comparative Examples 1 to 6 produced under the conditions shown in Table 1 and Table 2, the value TH (amount of Ti and Nb contained in precipitates of 5 to 100 nm) after hot rolling was evaluated. ), grain diameter (μm) and hardness Hv. In addition, the steel properties of each ...
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