Thick steel board
A thick steel plate and steel plate technology, which is applied in the field of low yield ratio and high toughness thick steel plate, can solve the problems of low yield ratio and high toughness, and achieve the effect of low yield ratio
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[0073] Experimental example 1
[0074] Various molten steels with chemical composition shown in the following Tables 1 to 3 are smelted by the usual melting method, and after cooling the molten steel to become a slab, hot rolling and cooling are performed under the conditions shown in Tables 4 and 5 below , To obtain various steel plates (thickness: 50mm). In addition, in the following Tables 1 and 3, REM is added in the form of a mixed rare earth containing about 50% of La and about 25% of Ce. In addition, "-" in the following Tables 1 to 3 means that there is no added element.
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[0078] 【Table 4】
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[0080] 【table 5】
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[0083] For each steel plate obtained, the base metal structure (ferrite grain size, MA fraction) and mechanical properties (tensile properties of the base metal, impact properties of the base metal) were measured by the following methods, and the HAZ toughness was also measured Evaluation. The measurement results ...
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