600mpa hot-rolled automobile beam steel strip with high fatigue performance and preparation method
A technology for the fatigue performance of automobile girder steel, which is applied in metal rolling, rolling force/roll gap control, temperature control, etc., can solve the problems of poor fatigue performance of girder steel strips, and achieve the suppression of coarsening, growth, and thinning Crystal grains, the effect of increasing strength
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[0023] The preparation method of the above-mentioned high-fatigue performance 600MPa-grade hot-rolled automobile girder steel strip sequentially includes the steps of smelting, continuous casting, heating, rough rolling, UFC intermediate billet cooling, finishing rolling, laminar cooling and coiling, and specifically includes the following steps:
[0024] a. According to the chemical composition of the high-fatigue performance 600MPa hot-rolled automobile girder steel strip, the casting billet is prepared;
[0025] b. Rough rolling: Roll the heated slab into a slab, and use 3+3 mode rough rolling for the thin slab, control the deformation of the first pass ≥ 20%, and the deformation of the last pass ≥ 30%, Cumulative deformation ≥ 80%; rough rolling in 0+5 mode for thick slabs, control the deformation of the first pass ≥ 20%, the deformation of the last pass ≥ 30%, and the cumulative deformation of the last two stands ≥ 47 %, cumulative deformation ≥ 72%;
[0026] c. UFC inte...
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[0035] This example provides one group of high-fatigue performance 600MPa-grade hot-rolled automobile beam steel strips prepared by the preparation method of the present invention and two sets of comparative examples. Table 1 shows the chemical composition of the automobile beam steel strip slabs.
[0036] Table 1 Chemical composition of 600MPa grade hot-rolled girder strip slab (wt.%)
[0037] Numbering C Si Mn P S N Nb Ti Example 1 0.035 0.068 1.51 0.003 0.005 0.0035 0.012 0.039 Comparative Example 1 0.052 0.074 1.92 0.012 0.008 0.0046 0.015 0.044 Comparative Example 2 0.052 0.08 0.83 0.02 0.012 0.0053 0.02 0.01
[0038] The heated slabs are rolled into slabs and then rough rolled. The main process control parameters of slab rough rolling are shown in Table 2.
[0039]Table 2 Rough rolling process of 600MPa grade hot-rolled girder strip
[0040]
[0041] UFC intermediate slab cooling: the slab after rough ro...
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