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Steel containing P and used for intermediate frequency (IF) automotive panel and production method thereof

A technology for panels and automobiles, which is applied in the field of P-containing IF automobile panel steel and its production, can solve the problems of difficult process control, high production cost, and many alloying elements, and achieves low production cost, few alloying elements, and excellent depth. The effect of punching performance

Inactive Publication Date: 2012-08-22
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcomings of this patent document are that there are many alloying elements, resulting in high production costs, difficult process control, and poor formability

Method used

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  • Steel containing P and used for intermediate frequency (IF) automotive panel and production method thereof
  • Steel containing P and used for intermediate frequency (IF) automotive panel and production method thereof
  • Steel containing P and used for intermediate frequency (IF) automotive panel and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A P-containing IF automobile panel steel, its components and weight percentages are: C: 0.0019%, Si: 0.06%, Mn: 0.35%, P: 0.045%, Ti: 0.04%, Al: 0.024%, B: 0.0023%, S: 0.011%, N: 0.0027%, and the rest is Fe and unavoidable impurities.

[0030] Produce a kind of method that contains the IF automobile panel steel of P, its step:

[0031] 1) Smelting and continuous casting into components and weight percentages: C: 0.0019%, Si: 0.06%, Mn: 0.35%, P: 0.045%, Ti: 0.04%, Al: 0.024%, B: 0.0023%, S: 0.011%, N: 0.0027%, the rest is cast slab of Fe and unavoidable impurities;

[0032] 2) Heating and keeping the casting blank, the heating temperature is controlled at 1200℃~1210℃, and the holding time is controlled at 90 minutes;

[0033] 3) Rough rolling is carried out, and the rolling start temperature is controlled at 1120°C to 1125°C;

[0034] 4) Carry out finish rolling, and control the finish rolling temperature at 910-915°C;

[0035] 5) Carry out coiling, and control the ...

Embodiment 2

[0041] A P-containing IF automobile panel steel, its components and weight percentages are: C: 0.0038%, Si: 0.056%, Mn: 0.312%, P: 0.056%, Ti: 0.055%, Al: 0.02%, B: 0.0031%, S: 0.012%, N: 0.0023%, and the rest is Fe and unavoidable impurities.

[0042] Produce a kind of method that contains the IF automobile panel steel of P, its step:

[0043] 1) The smelting and continuous casting components and weight percentages are: C: 0.0038%, Si: 0.056%, Mn: 0.312%, P: 0.056%, Ti: 0.055%, Al: 0.02%, B: 0.0031% , S: 0.012%, N: 0.0023%, the rest is cast slab of Fe and unavoidable impurities;

[0044] 2) Heating and keeping the casting blank, the heating temperature is controlled at 1215°C to 1225°C, and the holding time is controlled at 85 minutes;

[0045] 3) Rough rolling is carried out, and the rolling start temperature is controlled at 1130°C to 1135°C;

[0046] 4) Carry out finish rolling, and control the finish rolling temperature at 922-927°C;

[0047] 5) Carry out coiling, and...

Embodiment 3

[0053] A P-containing IF automobile panel steel, its components and weight percentages are: C: 0.001%, Si: 0.04%, Mn: 0.325%, P: 0.077%, Ti: 0.041%, Al: 0.025%, B: 0.0045%, S: 0.0015%, N: 0.003%, and the rest is Fe and unavoidable impurities.

[0054] Produce a kind of method that contains the IF automobile panel steel of P, its step:

[0055] 1) The smelting and continuous casting components and weight percentages are: C: 0.001%, Si: 0.04%, Mn: 0.325%, P: 0.077%, Ti: 0.041%, Al: 0.025%, B: 0.0045% , S: 0.0015%, N: 0.003%, the rest is cast slab of Fe and unavoidable impurities;

[0056] 2) Heating and keeping the casting slab, the heating temperature is controlled at 1245°C to 1250°C, and the holding time is controlled at 62 minutes;

[0057] 3) Rough rolling is carried out, and the rolling start temperature is controlled at 1125°C to 1130°C;

[0058] 4) Carry out finish rolling, and control the finish rolling temperature at 925-930°C;

[0059] 5) Carry out coiling, and co...

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PUM

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Abstract

The invention relates to a steel containing P and used for an intermediate frequency (IF) automotive panel and a production method thereof. The steel comprises the following components by weight percent: less than or equal to 0.0048% of C, 0.04-0.06% of Si, 0.28-0.35% of Mn, 0.045-0.096% of P, 0.04-0.065% of Ti, 0.02-0.025% of Al, 0.0023-0.007% of B, less than or equal to 0.015% of S, less than or equal to 0.003% of N and the balance of Fe and inevitable impurities. The production method comprises the following steps: smelting and casting into a blank; heating and heat preserving the casting blank; rough rolling, finish rolling, reeling up, conventionally pickling, cold rolling and continuously annealing for later use. After a trace of B is added in the steel, a competitive grain-boundary segregation rule of B and P is utilized and a continuous annealing technological parameter is controlled, thereby the problem of secondary cold machining brittleness caused by P grain-boundary segregation is lowered, the value r achieves 1.9 and over 1.9 and the forming property is better and more stable.

Description

technical field [0001] The invention relates to steel for automobile panels and a production method thereof, in particular to P-containing IF steel for automobile panels and a production method thereof. Background technique [0002] Phosphorus-containing high-strength interstitial atom-free steel (IF steel) is widely used in car panels due to its high strength and excellent deep-drawing properties. Adding phosphorus to high-strength IF steel can significantly increase the yield strength of the steel without compromising the deep-drawing properties of the steel. It is a relatively economical solid-solution strengthening element. However, studies have found that phosphorus has a strong tendency to segregate at grain boundaries during the recrystallization annealing process of cold-rolled IF steel. The phosphorus concentration is tens to hundreds of times higher than the phosphorus content in the matrix. The segregation of phosphorus causes changes in the electronic density o...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D1/26C21D8/04
Inventor 王志奋宋新莉邓照军袁泽喜陈士华吴立新韩荣东孙宜强黄海娥马家艳
Owner WUHAN IRON & STEEL (GROUP) CORP
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