Precipitation strengthening type high-strength and high-toughness medium-manganese steel plate and preparation method thereof

Abstract

The invention discloses a precipitation strengthening type high-strength and high-toughness medium-manganese steel plate. The precipitation strengthening type high-strength and high-toughness medium-manganese steel plate is prepared from the following chemical components in percentage by mass: 0.04%-0.10% of C, 0.2%-0.6% of Si, 4.0%-6.0% of Mn, 0.4%-1.0% of Al, 0.02%-0.08% of Nb, 1.0%-2.5% of Cu,1.5%-2.5% of Ni, 0.001%-0.004% of B, less than or equal to 0.005% of P, less than or equal to 0.003% of S and the balance of Fe and inevitable impurities. The invention further discloses a preparationmethod. The preparation method comprises the following steps that smelting and forging are carried out on the chemical components to obtain a steel billet; the steel billet is rolled to obtain a hotrolled plate; and the hot rolled plate is sequentially subjected to annealing and tempering to prepare the high-strength and high-toughness medium-manganese steel plate, wherein the annealing temperature is 610 DEG C-650 DEG C for 1h-2h, and tempering is carried out at the temperature of 450 DEG C-550 DEG C for 1.5h-2.5h. The high-strength and high-toughness medium-manganese steel plate is high instrength and impact toughness.

Description

technical field [0001] The invention relates to the technical field of steel preparation, in particular to a precipitation-strengthened high-strength and tough medium manganese steel plate and a preparation method thereof. Background technique [0002] Medium and heavy plate is the key structural material of large-scale engineering equipment such as construction machinery, pressure vessels and offshore platforms, and occupies a pivotal position in the field of basic manufacturing and engineering equipment. At present, my country has made great progress in the development of medium and heavy plate varieties, but high-quality medium and heavy plates are used in some special fields, such as high-formability construction machinery steel above 960MPa, low-cost high-strength ship pressure shell There are still deficiencies in steel research and development. In particular, my country has not yet made a breakthrough in the development of high-quality medium and thick plates integrat...

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Problems solved by technology

Although this contradiction can be reconciled to a certain extent by medium temperature tempering, it is obvious that the strengthening of Cu-rich phase and the plastic-toughening effect of retained austenite cannot be optimally utilized.

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