Automobile panel steel and preparation method thereof

A panel and automobile technology, applied in the field of automobile manufacturing materials, can solve the problems of material deep drawing performance degradation, etc., and achieve the effect of excellent deep drawing performance and high tensile strength

CN107287505AInactive Publication Date: 2017-10-24安徽信和汽车股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-10-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to automobile panel steel and a preparation method thereof. The automobile panel steel comprises components, by weight percent, 0.002% or less of C, 0.03%-0.05% of Si, 0.24%-0.30% of Mn, 0.005% or less of P, 0.03%-0.05% of Ti, 0.015%-0.030% of Al, 0.006% or less of S, 0.003% or less of N, 0.025%-0.035% of Nb, 0.01%-0.015% of Ce and 0.008%-0.012% of Nd. The process comprises smelting, continuous casting, hot rolling, cold rolling and annealing. In the smelting process, an RH-OB manner is used for deep decarburization, and after Ce and Nd alloy elements are added, argon blows a steel ladle for 15-20 minutes in a soft manner; a plate blank keeps the temperature for 48 hours in a burial pit; before hot rolling, the plate blank is heated to 1,280 DEG C, the primary rolling temperature is 1,230 DEG C, the final rolling temperature is 950 DEG C, and the hot rolling coiling temperature ranges from 620 DEG C to 650 DEG C; and a hot rolling roll is subjected to cold rolling to form a cold rolled plate, the cold rolled plate is heated to 870 DEG C in an annealing furnace and then keeps the temperature for 2.3 hours, and finally the cold rolled plate naturally cools along with an annealing furnace. The plate prepared through the preparation method has very high strength and can keep good deep drawability.
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Description

technical field

[0001] The invention relates to the field of materials for automobile manufacturing, in particular to a steel for automobile panels and a preparation method thereof. Background technique

[0002] The steel used for automobile panels has gone through from boiling steel to aluminum-killed steel to the current ultra-low carbon steel. It can be said that the steel used in automobiles has undergone a qualitative leap. Ultra-low carbon interstitial atom-free pure ferritic steel, which was first successfully developed in 1949, its basic principle is to add a certain amount of Ti, Nb and other elements to ultra-low C and N steel, and the interstitial atoms in the steel C and N are fixed as carbon and nitrogen compounds to obtain clean ferrite, which has good deep drawing performance. With the continuous improvement of people's requirements for automobile performance, especially in terms of safety, comfort, and fuel consumption, new requirements are put forward for a...

Examples

Embodiment 1

[0019] A steel for automobile panels, its composition and weight percentage content are: C: 0.002%; Si: 0.03%; Mn: 0.24%; P: 0.005%; Ti: 0.03%; Al: 0.015%; S: 0.006% ; N: 0.003%; Nb: 0.025%; Ce: 0.01%; Nd: 0.008%; the rest is Fe and unavoidable impurities.

[0020] A method for preparing steel for automobile panels, comprising the following steps:

[0021] (1) The composition and weight percentage of molten steel are: C: 0.002%; Si: 0.03%; Mn: 0.24%; P: 0.005%; Ti: 0.03%; Al: 0.015%; S: 0.006% ; N: 0.003%; Nb: 0.025%; Ce: 0.01%; Nd: 0.008%; the rest is molten steel with Fe and unavoidable impurities; the smelting process adopts RH-OB deep decarburization, in which Ce and Nd alloy elements are in Add after decarburization, and use argon gas to blow softly on the ladle for 20 minutes after adding Ce and Nd alloy elements; the tapping temperature of RH-OB is controlled at 1590 ° C ~ 1600 ° C to provide a temperature drop margin for soft blowing.

[0022] (2) Continuous casting:...

Embodiment 2

[0031] A steel for automobile panel, its composition and weight percentage content are: C: 0.002%; Si: 0.04%; Mn: 0.28%; P: 0.005%; Ti: 0.04%; Al: 0.020%; S: 0.006% ; N: 0.003%; Nb: 0.03%; Ce: 0.012%; Nd: 0.01%; the rest is Fe and unavoidable impurities.

[0032] A method for preparing steel for automobile panels, comprising the following steps:

[0033] (1) The composition and weight percentage of molten steel are: C: 0.002%; Si: 0.04%; Mn: 0.28%; P: 0.005%; Ti: 0.04%; Al: 0.020%; S: 0.006% ; N: 0.003%; Nb: 0.03%; Ce: 0.012%; Nd: 0.01%; the rest is Fe and unavoidable impurities. The smelting process adopts the RH-OB method for deep decarburization, in which Ce and Nd alloying elements are added after decarburization, and after the addition of Ce and Nd alloying elements, argon is used to blow the ladle softly for 20 minutes; the tapping temperature of RH-OB is controlled at 1590 ℃~1600℃, provide temperature drop allowance for soft blowing.

[0034] (2) Continuous casting: ...

Embodiment 3

[0042] A steel for automobile panel, its composition and weight percentage content are: C: 0.002%; Si: 0.05%; Mn: 0.30%; P: 0.005%; Ti: 0.05%; Al: 0.030%; S: 0.006% ; N: 0.003%; Nb: 0.035%; Ce: 0.015%; Nd: 0.012%; the rest is Fe and unavoidable impurities.

[0043] A method for preparing steel for automobile panels, comprising the following steps:

[0044] (1) The composition and weight percentage of molten steel are: C: 0.002%; Si: 0.05%; Mn: 0.30%; P: 0.005%; Ti: 0.05%; Al: 0.030%; S: 0.006% ; N: 0.003%; Nb: 0.035%; Ce: 0.015%; Nd: 0.012%; the rest is Fe and unavoidable impurities. The smelting process adopts the RH-OB method for deep decarburization, in which Ce and Nd alloying elements are added after decarburization, and after the addition of Ce and Nd alloying elements, argon is used to blow the ladle softly for 20 minutes; the tapping temperature of RH-OB is controlled at 1590 ℃~1600℃, provide temperature drop allowance for soft blowing.

[0045] (2) Continuous casting...