A kind of fine-grained steel with tensile strength of 1500mpa and preparation method thereof
A technology of tensile strength and fine grain, which is applied in the field of research and development of fine grain steel production, can solve the problems that the production process is difficult to reach the tensile level, and achieve the effect of improving toughness and tensile capacity
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[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0022] The invention provides a technical solution: a fine-grained steel with a tensile strength of 1500 MPa, the chemical composition ratio of the fine-grained steel: C: 0.21-0.26wt%, Si: 0.40-0.54wt%, Mn: 1.48-1.66wt% %, Cr: 0.20~0.25wt%, Nb: 0.012~0.017wt%, V: 0.095~0.110wt%, S: ≤0.040wt%, P: ≤0.043wt%, O: ≤0.0070wt%, N: 0.0240 ~0.0265wt%, the rest is Fe and impurities that cannot be purified at this stage.
[0023] In this embodiment, the steel material is firstly heated and melted, and the heating is continued to rapidly reduce the amount of oxygen in the steelmaking furnace. When tapping beg...
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