Production method of environment-friendly high-surface quality and pickling-free beamsteel
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A technology of automobile girder steel and high surface, which is applied in the field of steel rolling, and can solve problems affecting the service life of stamping dies, affecting the production of auto parts, and polluting the environment
Active Publication Date: 2010-12-08
SHOUGANG CORPORATION +1
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[0004] Before stamping structural parts for automobiles, the iron oxide scale on the surface of the steel plate is usually removed by pickling. If the automobile manufacturer directly stamps the hot-rolled automobile frame steel plate without pickling, it will cause the surface of the steel plate to be damaged. The iron oxide scale falls off and turns into powder, so the iron oxide scale powder that falls off will pollute the environment, and at the same time affect the service life of the stamping die and is uneconomical, seriously affecting the production of the next step of the auto parts
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Embodiment 1
[0017] The molten iron is subjected to KR desulfurization treatment, full three desulfurization converter, and LF furnace refining treatment, and then continuous casting; the slab smelting composition: C is 0.08wt%, Si is 0.10wt%, Mn is 1.20wt%, P is 0.008 wt%, S is 0.004 wt%, Cr is 0.15 wt%, Nb is 0.03 wt%, and Alt is 0.04 wt%.
[0018] The slab is heated to 1260°C, the heating time is 3.2 hours, the finishing temperature is 890°C, and the coiling temperature is 580°C; in this way, after rough rolling, finishing rolling, and laminar cooling, coiling is carried out. Finally, 510L automobile frame steel was obtained. The yield strength was 410 MPa, the tensile strength was 540 MPa, and the elongation was 32%, the thickness was 8.5 mm, and the width was 1822 mm.
Embodiment 2
[0020] The molten iron is subjected to KR desulfurization treatment, full three desulfurization converter, and LF furnace refining treatment, and then continuous casting; the slab smelting composition: C is 0.09wt%, Si is 0.10wt%, Mn is 1.46wt%, P is 0.008 wt%, S 0.004 wt%, Cr 0.15 wt%, Nb 0.045 wt%, V 0.047 wt%, Ti 0.015 wt%, Alt 0.034 wt%.
[0021] The slab is heated to 1260°C, the heating time is 3.5 hours, the final rolling temperature is 880°C, and the coiling temperature is 560°C; in this way, after rough rolling, finishing rolling, and laminar cooling, coiling is carried out. Finally, 610L automobile frame steel was obtained. The yield strength was 535 MPa, the tensile strength was 640 MPa, and the elongation was 25%, the thickness was 9.8 mm, and the width was 1732 mm.
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Abstract
The invention provides a production method of environment-friendly high-surface quality and pickling-free beamsteel, belonging to the technical field of steel rolling and comprising the following steps: continuously casting molten iron after KR desulfuration treatment, complete pretreatment convertor steelmaking and LF furnace refining treatment; crimping a plate blank after reheating, roughing, finish rolling and laminar cooling; and finally obtaining the beamsteel satisfying the production requirement. Therefore, on the basis of meeting the beamsteel performance, by optimizing the chemical components of the beamsteel, heating cycle, rolling technology and the like and controlling the structure of surface scale of the beamsteel, the high-surface quality and pickling-free beamsteel can be produced. A 2250mm hot continuous rolling broad strip mill is used to produce pickling-free 510L and 610L steel plates for automobile beams, wherein the width of the steel plate is 1100-2100mm and the thickness thereof is 1.6-14.0mm. By controlling the chemical components and melting and rolling key process parameters, the high-surface quality and pickling-free steel plate for the automobile beam can be produced, which meets the production requirement.
Description
technical field [0001] The invention belongs to the technical field of steel rolling, and in particular provides an environment-friendly production method for pickling-free automobile frame steel with high surface quality, which is a production technology for producing high-quality pickling-free automobile frame steel. Background technique [0002] With the rapid development of my country's national economy, it has driven the prosperity of the domestic transportation industry, and correspondingly accelerated the progress of automobile technology and the increase in demand year by year. Therefore, automobile manufacturers have higher and higher quality requirements for automobile steel plates. And with the development of heavy-duty vehicles, high-strength steel plates for automobile girders are the development trend. The use of high-strength automobile girders can reduce the weight of automobiles and increase the payload of automobiles without increasing the weight of automobi...
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