Medium manganese steel plate and preparation method thereof
A technology of manganese steel sheet and hot-rolled sheet is applied in the field of medium manganese steel sheet and its preparation, which can solve the problems of slow distribution of alloy elements and long production process cycle, so as to reduce process difficulty, avoid insufficient austenite stability, and improve process The effect of operational flexibility
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[0041] A kind of preparation method of medium manganese steel plate provided by the embodiment of the present invention comprises the following steps:
[0042] 1) Smelting and casting steps: smelting and casting the medium manganese steel preparation raw materials to obtain rolling blanks.
[0043] This step specifically includes: according to the composition ratio of the high-strength medium-manganese steel, smelting in a conventional converter or an electric arc furnace, continuous casting or die casting, and then forging to form a rolled billet.
[0044] Preferably, in terms of weight percentage, the raw materials for preparing medium manganese steel include the following chemical components:
[0045] C: 0.05-0.4%, Mn: 3-10%, Si: 0-2%, Al: 0-3%, V: 0-0.2%, Ti: 0-0.2%, P≤0.005%, S≤0.05 %, the balance is Fe.
[0046] 2) Hot-rolling treatment step: performing hot-rolling treatment on the rolled billet to obtain a hot-rolled plate.
[0047] This step is specifically as follo...
Embodiment 1
[0056] Embodiment 1 prepares 1# medium manganese steel plate, wherein, by weight percentage, the chemical composition of 1# medium manganese steel plate is as follows:
[0057] C: 0.19%, Mn: 4.76%, P≤0.005%, S≤0.05%, and the balance is Fe.
[0058] Among them, the main steps are as follows:
[0059] 1) Smelting and casting steps: use a conventional converter or an electric arc furnace to smelt the medium manganese steel preparation raw materials, and after smelting, die casting and forging to form a rolling billet of 60mm×60mm×500mm.
[0060] 2) Hot rolling treatment steps: heat the rolled billet to 1200°C for 2 hours, start rolling at 1050°C, and obtain a hot-rolled plate after 7 passes of hot rolling, with a final rolling temperature of 850°C, and air-cool to room temperature after hot rolling; Wherein, the total cumulative reduction of the hot-rolled sheet is 96%, and the final thickness of the hot-rolled sheet is 2.5mm.
[0061] 3) Pre-phase transformation controlled ann...
Embodiment 2
[0065] Embodiment 2 prepares 1# medium manganese steel plate, and the difference of embodiment 1 is:
[0066] 3) Preliminary phase change controlled annealing step: heating the hot-rolled sheet to 700° C., keeping it warm for 10 minutes, and air cooling to room temperature to obtain the first annealed sheet.
[0067] Other steps and parameters are consistent with embodiment 1.
[0068] Here, Example 2 adopts the annealing process of 1-2, that is, after pre-annealing at a temperature of 700° C. for 10 minutes, conventional annealing is performed at a temperature of 650° C. for 10 minutes.
[0069] figure 1 It is the TEM figure of the microstructure of the first annealed plate that embodiment 2 obtains, from figure 1 It can be seen that the first annealed sheet has an ultra-fine microstructure interspersed with lath ferrite and new martensite.
[0070] figure 2 It is the TEM figure of the microstructure of the 1# medium manganese steel plate that embodiment 2 obtains; fig...
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Abstract
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