High fatigue performance 900mpa hot-rolled automobile girder steel strip and preparation method
A technology for automobile girder steel and fatigue performance, which is applied in metal rolling and other directions, and can solve problems such as poor fatigue performance of girder steel strips
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[0020] The preparation method of the above-mentioned high-fatigue performance 900MPa-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:
[0021] a. According to the chemical composition of the high fatigue performance 900MPa hot-rolled automobile beam steel strip, the casting billet is prepared;
[0022] b. Rough rolling: Roll the heated slab into a slab, 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 ≥ 35%, 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 ≥ 35%, and the cumulative deformation of the last two stands ≥ 50 %, cumulative deformation ≥ 78%;
[0023] c. UFC intermedia...
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[0032] This example provides one group of high-fatigue performance 900MPa-grade hot-rolled automobile beam steel strips prepared by the preparation method of the present invention and two sets of comparative examples. The chemical composition of the automobile beam steel slabs is shown in Table 1.
[0033] Table 1 Chemical composition of 900MPa grade hot-rolled girder steel slab (wt.%)
[0034] Numbering C Si Mn P S N Ti Nb V Mo Example 1 0.021 0.056 2.5 0.008 0.002 0.002 0.15 0.095 0.072 0.11 Comparative Example 1 0.052 0.074 2.3 0.012 0.008 0.0046 0.18 0.079 0.088 0.13 Comparative Example 2 0.080 0.068 2.3 0.012 0.010 0.0055 0.23 0.12 0.17 0.14
[0035] 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.
[0036] Table 2 Rough rolling process of 900MPa grade hot-rolled girder strip
[0037]
[0038]
[0039]...
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