Method for producing 65Mn hot rolled steel plate
A technology of hot-rolled steel sheet and production method, which is applied in the field of spring steel production, can solve the problems of high crack sensitivity, long heating time, decarburization on the surface of the cast slab, etc., and achieves uniform structure and properties, improved tensile strength, and improved yield strength. Effect
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[0026] Example 1
[0027] Production of the 65Mn hot-rolled sheet of the present embodiment includes the following steps:
[0028] The process flow of thin slab continuous casting and rolling: 150t ultra-high power electric furnace smelting, 150t ladle furnace refining, thin slab continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar cooling, coiling.
[0029] The chemical composition of the molten steel after refining is: C: 0.63wt.%, Si: 0.19wt.%, Mn: 0.97wt.%, P: 0.006wt.%, S: 0.012wt.%, Cr: 0.06wt.%, Ni: 0.08wt.%, the rest are Fe and inevitable impurities;
[0030] The process parameters of the thin slab continuous casting and rolling process are: molten steel superheat T 过 is 33℃, and the temperature of the billet entering the furnace is T 入 is 935℃, the finishing temperature T 终 is 860°C, the coiling temperature T 卷 635℃, continuous casting speed S 拉 is 3.6m / min.
[0031] The physical and chemical properties of mold slag: the mel...
Example Embodiment
[0035] Example 2
[0036] Production of the 65Mn hot-rolled sheet of the present embodiment includes the following steps:
[0037] The process flow of thin slab continuous casting and rolling: 150t ultra-high power electric furnace smelting, 150t ladle furnace refining, thin slab continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar cooling, coiling.
[0038] The chemical composition of the molten steel after refining is: C: 0.66wt.%, Si: 0.35wt.%, Mn: 1.10wt.%, P: 0.015wt.%, S≤0.007wt.%, Cr: 0.09wt.%, Ni: 0.07wt.%, the rest are Fe and inevitable impurities;
[0039] The process parameters of the thin slab continuous casting and rolling process are: molten steel superheat T 过 is 44°C, the billet entering the furnace temperature T 入 is 1030℃, the finishing temperature T 终 is 940°C, the coiling temperature T 卷 580℃, continuous casting speed S 拉 is 5.3m / min.
[0040] The physical and chemical properties of the mold slag used are as fol...
Example Embodiment
[0044] Example 3
[0045] Production of the 65Mn hot-rolled sheet of the present embodiment includes the following steps:
[0046] The process flow of thin slab continuous casting and rolling: 150t ultra-high power electric furnace smelting, 150t ladle furnace refining, thin slab continuous casting, soaking, high-pressure water descaling, hot continuous rolling, laminar cooling, coiling.
[0047] The chemical composition of the molten steel after refining is: C: 0.69wt.%, Si: 0.19wt.%, Mn: 0.99wt.%, P: 0.018wt.%, S: 0.009wt.%, Cr: 0.12wt.%, Ni≤0.08wt.%, the rest are Fe and inevitable impurities;
[0048] The process parameters of the thin slab continuous casting and rolling process are: molten steel superheat T 过 is 36℃, and the temperature of the billet entering the furnace is T 入 is 990℃, the finishing temperature T 终 is 890°C, the coiling temperature T 卷 560℃, continuous casting speed S 拉 is 4.5m / min.
[0049] The physical and chemical properties of mold slag: the me...
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