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High fatigue performance 900mpa hot-rolled automobile girder steel strip and preparation method
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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
Active Publication Date: 2022-07-19
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is the poor fatigue performance of the existing 900MPa grade hot-rolled automobile frame steel strip
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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...
Embodiment
[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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Abstract
The invention discloses a 900MPa-grade hot-rolled automobile beam steel strip with high fatigue performance and a preparation method, and belongs to the technical field of steelmaking. 900MPa hot-rolled automotive beam steel strip with high fatigue performance, chemical composition by mass percentage: C 0.02‑0.06%, Si 0‑0.08%, Mn 2.2‑2.8%, P≤0.015%, S≤0.01%, Nb 0.065‑ 0.12%, Ti 0.13‑0.25%, V 0.07‑0.15%, Mo 0.1‑0.2%, N≤0.005%, the rest are Fe and inevitable impurities, the microstructure is ferrite 90‑98% and ultrafine needles 2‑10% bainite and grain size 14‑15. The preparation method sequentially includes the steps of smelting, continuous casting, heating, rough rolling, UFC intermediate billet cooling, finishing rolling, laminar cooling and coiling. The 900MPa-grade hot-rolled automobile beam steel strip produced by the invention has excellent surface quality, excellent fatigue performance, formability and toughness, and can effectively solve the problem of poor fatigue performance of the existing 900-MPa-grade hot-rolled automobile beam steel strip.
Description
technical field [0001] The invention belongs to the technical field of steelmaking, relates to a hot-rolled automobile frame steel sheet, and in particular relates to a high-fatigue performance 900MPa-grade hot-rolled automobile frame steel strip and a preparation method. Background technique [0002] Reducing the weight of the car body can not only increase the load of the car, reduce the freight, but also reduce the exhaust emission of the car. An effective way to reduce body weight is to use high-strength steel plates to reduce the thickness of automotive components. Steel sheets for automobile frames are required to have press formability and fatigue strength such as bending properties and stretch flange properties. The steel used for girders has strict requirements on the strength, plasticity, cold stamping performance, low temperature impact toughness, weldability and fatigue performance of the material, not only high strength, good toughness, fatigue resistance, but ...
Claims
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