Steel for 690MPa grade hot rolled thick low-yield-ratio automobile spoke and preparation method thereof
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An automotive wheel, thick gauge technology, applied in the field of automotive steel, can solve the problems of affecting production rhythm, prone to cracking, waste of resources, etc., and achieve the effects of low yield ratio, high fatigue life, and high surface quality
Active Publication Date: 2018-09-07
SHOUGANG CORPORATION
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[0003] The production and processing of lightweight tubeless wheel spokes for commercial vehicles requires complex spinning deformation. The thickness of some parts can be reduced by more than 50%, and the hardness can be increased by about 20%. Cracks are prone to occur during spinning, which wastes resources and affects production rhythm
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Embodiment 1
[0049] After the molten iron is subjected to KR desulfurization treatment, the double refining treatment of LF refining + RH refining is carried out, and then fed to the pure Ca line for Ca treatment; after soft blowing, it enters the tundish, and then uses the continuous casting crystallizer for full protection casting; after casting, it goes off the production line Slow cooling in the slow cooling pit, the obtained slab composition contains C 0.06%, Si 0.15%, Mn 1.65%, P 0.010%, S0.002%, Alt 0.035%, Cr 0.20%, Nb 0.035% Ti 0.02 %, the balance is Fe and unavoidable impurities; the slab is heated to 1200°C for 3.5 hours, soaked for 35 minutes, and the furnace temperature is 1230°C, after descaling and width setting, and then 1+5 passes of rough Rolling and finishing rolling, the finish rolling exit speed is 3.8m / s; the rough rolling exit temperature is 1025°C, and the finishing rolling temperature is 859°C; the steel plate after finish rolling is cooled by laminar flow, using wa...
Embodiment 1-9
[0054] Table 2 embodiment 1-9 prepares the process parameter control of steel for automobile wheel spoke
[0055]
[0056] Characterization of finished steel
[0057] The mechanical property of the steel for automobile wheel spoke of table 3 embodiment 1-9
[0058]
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Abstract
The invention relates to steel for a 690MPa grade hot rolled thick low-yield-ratio automobile spoke. The steel comprises chemical compositions of, by weight, 0.06-0.10% of C, less than or equal to 0.20% of Si, 1.50-1.70% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.02-0.05% of Al, 0.15-0.25% of Cr, 0.02-0.04% of Nb, 0.01-0.03% of Ti, and the balance Fe and inevitable impurities. The invention further relates to a preparation method for the steel for the 690MPa grade hot rolled thick low-yield-ratio automobile spoke. The preparation method includes the steps ofmolten iron KR desulfurization, LF refining, RH refining, Ca treatment, continuous casting, and a hot rolling process. The preparation method adopts reasonable design of performance, specifications,compositions and the hot rolling process to produce the steel for the 690MPa grade hot rolled thick low-yield-ratio automobile spoke, the steel has high strength, low yield ratio, long fatigue life, high surface quality and stable performance, and meets the requirements of production and users.
Description
technical field [0001] The invention discloses a 690MPa-grade hot-rolled thick-gauge low-yield-strength-ratio automobile spoke steel and a preparation method thereof, belonging to the technical field of automobile steel. Background technique [0002] With the promulgation of the mandatory national standard GB1589 by the Ministry of Industry and Information Technology, OEMs have made it clear that vehicle weight reduction and material strength upgrades are imperative. Domestic auto structural parts manufacturers have stepped up research and development of lightweight products to seize the lightweight auto parts market, and wheel companies have also accelerated the pace of product research and development. [0003] The production and processing of lightweight tubeless wheel spokes for commercial vehicles requires complex spinning deformation. The thickness of some parts can be reduced by more than 50%, and the hardness can be increased by about 20%. Cracks are prone to occur d...
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