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Hot rolling steel plate for automobile girder, and manufacturing method thereof

A technology of hot-rolled steel plates and automobile beams, which is applied in the field of hot-rolled strip production, can solve the problems of difficult production process and high production cost, and achieve good strength and toughness matching, small performance difference between the same coils, and small anisotropy Effect

Inactive Publication Date: 2013-04-03
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a new hot-rolled steel plate for automobile girder and its manufacturing method in order to overcome the defects of high production cost and difficult production process of 700MPa high-strength hot-rolled steel plate in the prior art

Method used

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  • Hot rolling steel plate for automobile girder, and manufacturing method thereof

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Embodiment 1

[0032] This embodiment is used to illustrate the manufacturing method of the hot-rolled steel plate for the automobile frame provided by the present invention.

[0033] The composition of molten steel after the steelmaking step is: 0.05% by weight of C, 0.21% by weight of Si, 1.5% by weight of Mn, 0.05% by weight of Nb, 0.05% by weight of Ti, 0.01% by weight of P, and 0.008% by weight of S , the balance is Fe and unavoidable impurities, and then the overall argon gas sealing is used for casting. The molten steel is injected into the tundish through the sliding nozzle at the bottom of the ladle. / min, the thickness of the continuous casting slab is 200mm, and then it is soaked in a heating furnace at 1220°C. After the heated slab is dephosphorized by high-pressure water to remove the oxide scale formed on the surface, it enters the reversible roughing unit, and the roughing exit The temperature is 1025°C, the thickness of the intermediate billet after rough rolling is 38mm, and...

Embodiment 2

[0035] This embodiment is used to illustrate the manufacturing method of the hot-rolled steel plate for the automobile frame provided by the present invention.

[0036] The composition of molten steel after the steelmaking step is: 0.08% by weight of C, 0.15% by weight of Si, 1.3% by weight of Mn, 0.03% by weight of Nb, 0.1% by weight of Ti, 0.025% by weight of P, and 0.005% by weight of S , the balance is Fe and unavoidable impurities, and then the overall argon gas sealing is used for casting, and the molten steel is injected into the tundish through the sliding nozzle at the bottom of the ladle. / min, the thickness of the continuous casting slab is 250mm, and then it is soaked in a heating furnace at 1230°C. After the heated slab is dephosphorized by high-pressure water to remove the oxide scale formed on the surface, it enters the reversible roughing unit, and the roughing exit The temperature is 1040°C, the thickness of the intermediate billet after rough rolling is 45mm,...

Embodiment 3

[0038] This embodiment is used to illustrate the production method of the hot-rolled steel plate for automobile frame provided by the present invention.

[0039] The composition of the molten steel after the steelmaking step is: 0.1% by weight of C, 0.35% by weight of Si, 1.7% by weight of Mn, 0.07% by weight of Nb, 0.08% by weight of Ti, 0.02% by weight of P, and 0.01% by weight of S , the balance is Fe and unavoidable impurities, and then the overall argon gas sealing is used for casting. The molten steel is injected into the tundish through the sliding nozzle at the bottom of the ladle. / min, the thickness of the continuous casting slab is 200mm, and then it is soaked in a heating furnace at 1250°C. After the heated slab is dephosphorized by high-pressure water to remove the oxide scale formed on the surface, it enters the reversible roughing unit, and the roughing exit The temperature is 1025°C, the thickness of the intermediate slab after rough rolling is 55mm, and then i...

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Abstract

The present invention provides a manufacturing method of a hot rolling steel plate for an automobile girder. The production method comprises a steelmaking step, a continuous casting step, a heating step, a hot continuous rolling step and a coiling step, and is characterized in that components of the molten steel after steelmaking comprise 0.05-0.1 wt% of C, 0.15-0.35 wt% of Si, 1-2 wt% of Mn, 0.01-0.1 wt% of Nb, 0.03-0.12 wt% of Ti, less than or equal to 0.025 wt% of P, less than or equal to 0.01 wt% of S, and the balance of Fe and unavoidable impurities, a finish rolling temperature in the hot continuous rolling step is 830-900 DEG C, and a coiling temperature is 600-700 DEG C. The present invention further provides the hot rolling steel plate prepared by using the method and provided for the automobile girder. With the manufacturing method, production cost is reduced, and rolling process control is simple. With the hot rolling steel plate for the automobile girder, hot rolling product structures are substantially enriched and improved.

Description

technical field [0001] The present invention relates to the technical field of hot rolling strip production, in particular to a method for manufacturing a hot-rolled steel plate for a high-strength automobile frame with a yield strength of 700 MPa and a hot-rolled steel sheet for a high-strength automobile frame with a yield strength of 700 MPa manufactured by the method. Rolled steel. Background technique [0002] In recent years, with the continuous increase of automobile fuel costs and the increasingly serious negative impact of exhaust emissions on the living environment, coupled with the continuous improvement of people's requirements for automobile collision safety, how to reduce the weight of the car body under the premise of ensuring safety and comfort is the key to solving this series of problems. As a result, great changes are taking place in the structure of the automobile body and the materials used, and the strength of the steel used is required to be higher an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 左军张开华刘勇付开忠叶晓瑜翁建军黄徐晶李卫平
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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