Automobile beam steel with 960 MPa yield strength and production method thereof

The invention relates to a technology for automobile beam steel and a production method, which is applied in the field of automobile beam steel with a yield strength of 960 MPa and its production field. The effect of good low temperature impact toughness and good toughness

Active Publication Date: 2016-05-04
SHOUGANG CORPORATION +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] This application provides an automobile frame steel with a yield strength of 960MPa and its production method, which solves the technical problems in the prior art that the poor low-temperature impact toughness of the steel leads to potential safety hazards in the vehicle, and the low strength leads to limited weight reduction of the vehicle

Method used

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  • Automobile beam steel with 960 MPa yield strength and production method thereof
  • Automobile beam steel with 960 MPa yield strength and production method thereof
  • Automobile beam steel with 960 MPa yield strength and production method thereof

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Embodiment 1

[0037] In order to solve the technical problems in the prior art that the poor low-temperature impact toughness of steel leads to potential safety hazards in vehicles, and the low strength leads to limited weight reduction of vehicles, this application provides an automobile frame steel with a yield strength of 960MPa.

[0038] The chemical composition of the automobile frame steel with a yield strength of 960MPa is as follows: C: 0.12%-0.14%; Si: 0.15%-0.35%; Mn: 1.2%-1.5%; Nb: 0.02%-0.04%; Mo: 0.3%-0.5%; V: 0.08%-0.15%; Ti: 0.01%-0.04%; Al: 0.01%-0.06%; Cr: 0.4%-0.6%; B: 0.0015%-0.0025%; P: ≤0.02 %; S: ≤0.01%; N: ≤0.008%, the rest is Fe and unavoidable impurities. The metallographic structure diagram of said yield strength 960MPa automobile beam steel and its electron microscope image of precipitates, such as figure 1 and figure 2 shown.

[0039] The functions and limits of the above-mentioned main alloying elements are as follows:

[0040] Carbon C: Carbon plays an imp...

Embodiment 2

[0054] Based on the same inventive concept, the present application also provides a method for producing the automobile frame steel with a yield strength of 960 MPa, which is used to produce the automobile frame steel with a yield strength of 960 MPa in Example 1. Such as image 3 Shown, the production method of described yield strength 960MPa automobile frame steel, comprises the following steps:

[0055] Step 110, heating the slab to 1180-1250° C. in a heating furnace. Specifically, the holding time of the slab at 1180-1250° C. is controlled according to the effective thickness of 1-1.5 min / mm.

[0056] Step 120, putting the heated billet into a rolling mill for rolling to obtain a hot-rolled plate. Specifically, the rolling includes rough rolling and finish rolling, the thickness of the intermediate slab after the rough rolling and before the finish rolling is 5 to 10 times the thickness of the hot-rolled sheet after rough rolling, and the entrance of the finish rolling ...

example 1

[0076] Example 1 is smelted in a 220-ton converter and rolled on a 2250 hot rolling production line. The target width of the finished steel plate is 1500mm and the thickness is 3mm. The specific steps of smelting are:

[0077] S1: Slabs are obtained after molten steel is smelted in a converter; the content of P and S is strictly controlled during the smelting process to ensure the quality of the slabs. The chemical composition of the slab is as follows: calculated by mass percentage, C: 0.14%, Si: 0.20%, Mn: 1.20%, P: 0.014%, S: 0.003%, Al: 0.035%, Nb: 0.02%, Cr: 0.40 %, Mo: 0.30%, V: 0.08%, Ti: 0.025%, B: 0.0015%, N: 0.003%, and the balance is Fe and unavoidable impurities.

[0078] S2: Put the billet into the heating furnace for heating, the heating temperature is controlled at 1250° C., and the holding time is controlled at 215 minutes.

[0079] S3: putting the heated billet into a rolling mill for rolling to obtain a hot-rolled plate. Wherein, the entrance temperature in...

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Abstract

The invention discloses automobile beam steel with 960 MPa yield strength and a production method thereof. The automobile beam steel comprises the following chemical components in percent by weight: 0.12-0.14 percent of C, 0.15-0.35 percent of Si, 1.2-1.5 percent of Mn, 0.02-0.04 percent of Nb, 0.3-0.5 percent of Mo, 0.08-0.15 percent of V, 0.01-0.04 percent of Ti, 0.01-0.06 percent of Al, 0.4-0.6 percent of Cr, 0.0015-0.0025 percent of B, less than or equal to 0.02 percent of P, less than or equal to 0.01 percent of S, less than or equal to 0.008 percent of N, and the balance of Fe and inevitable impurities. C and Mn with low content are adopted, the separation strengthening effects of V, Nb and Ti are sufficiently utilized, and besides, a certain amount of Mo, a certain amount of Cr and a certain amount of B are added to control the heat treatment structure state, so that a fine and uniform tempering structure is obtained, the steel has high toughness, high welding performance and high low-temperature impact toughness, the safety performance of a vehicle is improved, the light-weight development of the vehicle is facilitated, and the technical problems that in the prior art, since the low-temperature impact toughness of steel is low, the potential safety hazards of a vehicle are caused, and the lightweight development of the vehicle is limited since the strength of the steel is low.

Description

technical field [0001] The invention relates to the technical field of steel production for lightweight vehicles, in particular to an automobile frame steel with a yield strength of 960MPa and a production method thereof. Background technique [0002] The lightweight of the car is to reduce the curb weight of the car as much as possible under the premise of ensuring the strength and safety performance of the car, so as to improve the power of the car, reduce fuel consumption, and reduce exhaust pollution. Experiments have proved that if the weight of the vehicle is reduced by 10%, the fuel efficiency can be increased by 6%-8%, and the fuel consumption can be reduced by about 7%. Looking at the current situation of my country's energy shortage, road overloading and low transportation efficiency, due to the needs of environmental protection and energy saving, automobile lightweight has not only become a top priority for the development of my country's automobile industry, but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/16C22C38/06C22C38/18C22C38/32C21D8/02
CPCC21D8/0226C21D8/0242C21D8/0247C22C38/02C22C38/04C22C38/06C22C38/12C22C38/16C22C38/18C22C38/32
Inventor 潘辉崔阳周娜惠亚军孙常库陈斌吴科敏李飞
Owner SHOUGANG CORPORATION
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