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Colding rolling weather resistant depth impacting plate for vehicle and mfg. method thereof

An automotive sheet and deep drawing technology, applied in temperature control and other directions, can solve the problems of difficult to control Re precipitation behavior, lack of weather resistance, high metallurgical cost, small springback, small fluctuation of tensile strength, and pure steel. high degree of effect

Inactive Publication Date: 2007-08-29
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to control the precipitation behavior of Re during the solidification process of molten steel during steelmaking, and the burning loss of Re is large, and the metallurgical cost is high.
[0005] On the other hand, existing typical cold-rolled low-carbon deep-drawn automotive sheets, such as St13 steel sheets (0.05%C, 0.03%Si, 0.25%Mn, 0.019%P, 0.014%S, 0.039%Al s ), St14 steel plate (0.03% C, 0.025% Si, 0.26% Mn, 0.012% P, 0.012% S, 0.048% Al s , 0.0045% N) do not contain corrosion-resistant elements, so they do not have obvious weather resistance

Method used

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  • Colding rolling weather resistant depth impacting plate for vehicle and mfg. method thereof
  • Colding rolling weather resistant depth impacting plate for vehicle and mfg. method thereof
  • Colding rolling weather resistant depth impacting plate for vehicle and mfg. method thereof

Examples

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Effect test

Embodiment 1

[0046] Example 1: Smelting the cold-rolled weather-resistant deep-drawn automobile steel plate of the present invention, the composition and weight percentage of the steel are: C0.002, Si0.01, Mn0.03, P0.013, S0.006, Cu0.031, Cr0. 35, Ni0.030, Als0.015, N0.0025, the balance is Fe and inevitable inclusions.

[0047] A method for preparing a cold-rolled weather-resistant deep-drawn automobile sheet, the steps of which are:

[0048] 1) Using the hot rolling controlled rolling and controlled cooling process, the steel billet is heated to 1200°C, and the temperature difference between the same plates is less than 25°C.

[0049] 2) Rough rolling is performed so that the exit temperature of the rough rolling is 1080°C.

[0050] 3) Perform finish rolling, and the inlet temperature of the slab during finish rolling is 1040°C.

[0051] 4) Perform final rolling, the final rolling temperature is 885°C, and the cooling rate is 20°C / s at this time.

[0052] 5) Carry out coiling, and the ...

Embodiment 2

[0055] Example 2: Smelting the cold-rolled weather-resistant deep-drawn automobile steel plate of the present invention, the composition and weight percentage of the steel are: C0.008, Si0.012, Mn0.05, P0.020, S0.007, Cu0.11, Cr0. 24, Ni0.10, N0.0038, Al s 0.020, the balance is Fe and unavoidable inclusions.

[0056] A method for preparing a cold-rolled weather-resistant deep-drawn automobile sheet, the steps of which are:

[0057] 1) Using the hot rolling controlled rolling and controlled cooling process, the steel billet is heated to 1210°C, and the temperature difference between the same plates is less than 25°C.

[0058] 2) Rough rolling is performed so that the exit temperature of the rough rolling is 1085°C.

[0059] 3) Perform finish rolling, and the inlet temperature of the slab during finish rolling is 1045°C.

[0060] 4) Perform final rolling, the final rolling temperature is 890°C, and the cooling rate is 20°C / s at this time.

[0061] 5) Carry out coiling, and t...

Embodiment 3

[0064] Example 3: Smelting the cold-rolled weather-resistant deep-drawing automobile steel plate of the present invention, the composition and weight percentage of the steel are: C0.012, Si0.016, Mn0.06, P0.025, S0.011, Cu0.14, Cr0. 18, Ni0.13, N0.0029, Al s 0.028, the balance is Fe and unavoidable inclusions.

[0065] A method for preparing a cold-rolled weather-resistant deep-drawn automobile sheet, the steps of which are:

[0066] 1) Using the hot rolling controlled rolling and controlled cooling process, the steel billet is heated to 1220°C, and the temperature difference between the same plates is less than 25°C.

[0067] 2) Rough rolling was performed so that the exit temperature of the rough rolling was 1092°C.

[0068] 3) Perform finish rolling, and the inlet temperature of the slab during finish rolling is 1050°C.

[0069] 4) Carry out final rolling, the final rolling temperature is 898°C, and the cooling rate is 20°C / s at this time.

[0070] 5) Carry out coiling,...

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Abstract

The invention relates to cold rolling weather-resistant deep drawing automobile sheet and its manufacturing method. It solves the defect of bad deep-drawing property and shape fixity in current technique. Its technical measures are as follows: its main components and their weight percentage are C:0.002-0.012%, Si:not less than 0.025%, Mn: not less than 0.10%, P:0.011-0.049%, S:not less than 0.015%, Als: 0.01-0.05%, Cr:0.15-0.35%,Cu:0.03-0.30%,Ni:0.03-0.30%,rest iron and unavoidable impurity. They also must satisfy the three formulas as follows: Cu+Cr+Ni<=0.6%; crack sensitivity=C+Mn / 20+Si / 30+Ni / 60+Cu / 20+Cr / 20<=0.08%; and carbon equivalent Ceq=C+Mn / 6+(Cu+Ni) / 15+Cr / 5<= 0.08%.

Description

technical field [0001] The invention relates to an automobile sheet and a preparation method thereof, in particular to a cold-rolled weather-resistant deep-drawn automobile sheet and a preparation method thereof. Background technique [0002] The forming methods of modern automobile panel steel plates are mainly divided into five categories, namely deep drawing forming, auxetic forming, shallow drawing forming, flanging forming, bending forming, typical parts of various forming types and the correspondence between material properties The relationships are listed in the following table: [0003] Typical molded parts and material properties of automotive panels [0004] It can be seen from the table that the most basic requirements for the mechanical formability of steel plates for stamping automobile panels can be summarized as follows: lower yield strength ≤ 250MPa, average plastic strain ratio r ‾ ≥ 1.35 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/42C21D8/04B21B37/74
Inventor 罗石念钟定忠尹晓青陈良罗新武孔勇江孙方义
Owner 武钢集团有限公司