Hot-rolled medium manganese steel with high product of strength and elongation and relatively low Mn content and preparation method thereof
A technology of high-strength plastic accumulation and medium manganese steel, which is applied in the field of automotive steel to achieve the effect of reducing Mn content and reducing the risk of embrittlement
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[0032] The second aspect of the present invention provides a method for preparing the above-mentioned hot-rolled high-strength plastic product medium manganese steel with a lower Mn content, the steps include:
[0033] S1. Continuous casting of molten steel to produce slabs or die casting to produce ingots. The chemical composition of molten steel includes: C: 0.19-0.5%, Mn: 3.0-7.0%, Al: 1.0-3.0%, Si : 0-2.0%, Cr: 0-5.0%, Ni: 0-2.0%, the balance is Fe and unavoidable impurities;
[0034] S2. The slab or ingot obtained in step S1 is hot-rolled after blooming. The hot-rolling process includes: heating the slab to 1120-1200°C for a soaking time of 1.5-2.5h, and hot rolling to a thickness through multiple passes For thin plates of 2-6mm, the final rolling temperature of the multi-pass hot rolling is 820-900°C, the coiling temperature after rolling is 500-600°C, and air cooling to room temperature;
[0035] S3. Put the hot-rolled sheet or coil obtained in step S2 into a bell furnace for...
Example Embodiment
[0037] Example 1
[0038] This embodiment provides a hot-rolled high-strength plastic product medium manganese steel with a relatively low Mn content. The chemical composition is, in weight percentage, C: 0.45%, Mn: 6.0%, Al: 2.0%, Si: 1.0% , Cr: 0.7%, Ni: 0.4%, the balance is Fe and unavoidable impurities.
[0039] The method for preparing the above-mentioned hot-rolled high-strength plastic medium manganese steel with lower Mn content includes:
[0040] The billet is heated to 1200°C for a soaking time of about 2h, and then hot rolled to a 4mm thick steel plate through multiple passes. The final rolling temperature is 820°C, then coiled at 550°C and air-cooled to room temperature.
[0041] Put the hot-rolled steel coil into a bell-type heating furnace for annealing, keep it at 700°C for 1 hour, and then cool to room temperature.
[0042] The hot-rolled high-strength plastic-product medium-manganese steel is obtained. figure 1 Shown.
[0043] According to GB / T228-2002 "Metal Material ...
Example Embodiment
[0046] Example 2
[0047] This embodiment provides a hot-rolled high-strength plastic medium manganese steel with a relatively low Mn content. The chemical composition is, in weight percentage, C: 0.38%, Mn: 3.0%, Al: 2.1%, Si: 0.8% , Cr: 3.1%, Ni: 1.8%, V: 0.2%, B: 0.2%, the balance is Fe and inevitable impurities.
[0048] The method for preparing the above-mentioned hot-rolled high-strength plastic medium manganese steel with lower Mn content includes:
[0049] The billet is heated to 1180°C, the soaking time is about 2h, and it is hot-rolled to a 5mm thick steel plate through multiple passes. The final rolling temperature is 850°C, then coiled at 525°C and air-cooled to room temperature.
[0050] The hot-rolled steel coil was put into a bell-type heating furnace for annealing, kept at 670° C. for 3 hours, and then cooled to room temperature to obtain a hot-rolled high-strength plastic product medium manganese steel, whose mechanical properties were basically the same as those of ...
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