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The strength of 440 MPa grade phosphorous high-strength IF steel independently developed by Baotou Steel is improved by adding such alloying elements as Si, Mn and P based on ultra low carbon steel. The control requirements of its composition and production process are strict as well as production is very difficult. In the paper, the influences of chemical elements on stamping performance of 440 MPa grade high-strength IF steel are mainly studied. The microstructure of steel strip, inclusion morphology and precipitation behavior of the second phase particles are analyzed with metalloscope and scanning electron microscope. The mechanisms of action of hot rolling processes such as finishing and coiling temperatures, continuous annealing process of cold rolling on microstructure and mechanical properties are explained. The mechanical performances of tested steel strip are stable and could meet the relative technical requirements through formulating reasonable process route and strict control.

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包钢自主研发的440 MPa级加磷高强IF钢在超低碳钢的基础上通过添加Si、Mn、P等合金元素提高强度,其成分及生产工艺控制要求严格,生产难度大。文章重点研究了化学元素对440 MPa级高强IF钢冲压性能的影响,采用金相显微镜、扫描电镜分析了钢带的微观组织、夹杂物形态及第二相粒子析出行为,解释了热轧工艺如终轧温度与卷取温度、冷轧连续退火工艺对微观组织及力学性能的作用机理。通过制定合理的工艺路线,并进行严格控制,试验钢带力学性能稳定且满足相关技术要求。

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张奇(1989-),男,内蒙古包头市人,硕士,工程师,现从事产品开发工作。

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化学元素	C	Si	Mn	P	S	Alt	Ti	N	B
设计成分	≤0.005	≤0.3	≤1.2	≤0.08	≤0.010	≥0.020	≤0.07	<0.005	≤0.002

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化学成分(质量分数) %

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化学元素	C	Si	Mn	P	S	Alt	Ti	N	B
设计成分	≤0.005	≤0.3	≤1.2	≤0.08	≤0.010	≥0.020	≤0.07	<0.005	≤0.002

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