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DC06 automobile plate hot-rolled strip steel and control method for edge part warping defects thereof

A technology for hot-rolled strip steel and a control method, applied in the field of iron and steel metallurgy, can solve problems such as insignificant effects, and achieve the effects of reducing edge warping defects, reducing bubbles and subcutaneous slag inclusion, and reducing the flow of argon blowing

Inactive Publication Date: 2020-12-15
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this solution is that the two-time chamfering of the strip steel by the sizing machine and the vertical roll has a certain effect, but because of the different composition and characteristics of different steel types, there are different casting defects. Therefore, the effect of this scheme on ultra-low carbon IF steel is not significant for edge warping defects caused by edge slag inclusions and edge bubbles.

Method used

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  • DC06 automobile plate hot-rolled strip steel and control method for edge part warping defects thereof
  • DC06 automobile plate hot-rolled strip steel and control method for edge part warping defects thereof
  • DC06 automobile plate hot-rolled strip steel and control method for edge part warping defects thereof

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Experimental program
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Effect test

Embodiment

[0043] A method for controlling the hot-rolled steel strip of DC06 automobile sheet and its edge warping defect in this embodiment, the mass percentages of each component of the hot-rolled steel strip of DC06 automobile sheet are: C≤0.0050%, Si≤0.050%, Mn 0.050%~0.20%, P≤0.020%, S≤0.010%, Als 0.030%~0.060%, Ti 0.040%~0.070%, N≤0.0050%; the balance is Fe and unavoidable trace elements.

[0044]Among them, Ti is the most critical microalloying element of DC06 grade IF steel. If Ti is not added, the r value (plastic strain ratio) of ultra-low carbon steel is low; adding Ti can form titanium carbonitride, making ferrite There is no interstitial solid solution of carbon and nitrogen atoms in the material, which greatly improves the deep drawing performance of the material. In particular, the addition amount of titanium Ti≥8(C+N), when the addition amount of titanium Ti=8(C+N), theoretically C and N can be completely fixed and form TiC and TiN, but in practice, There is also a smal...

Embodiment 1

[0065] The mass percentage of each component of DC06 automobile sheet is: C 0.0015%, Si 0.0032%, Mn 0.12%, P0.011%, S 0.0047%, Als 0.045%, Ti 0.059%, N 0.0026%; the balance is Fe and not Trace elements to avoid; where Ti=14.4 (C+N), so that Ti can be fully and effectively combined with C and N, and C and N can be completely fixed and form TiC and TiN;

[0066] Carry out pre-desulfurization treatment on molten iron by KR method, after desulfurization treatment, S in molten iron is 0.0020%;

[0067] The molten iron is initially smelted in a top-bottom combined blowing converter, and the scrap steel load is 41 tons; the temperature control range of the end point of the converter is 1671°C, the carbon content control range of the end point of the converter is 0.042%, and the oxygen content of the end point of the converter is 504; the slag blocking cone and pneumatic slag blocking are adopted The method of controlling the amount of slag during tapping; the flow time of steel durin...

Embodiment 2

[0079] The mass percentage of each component of DC06 automobile sheet is: C 13ppm, Si 36ppm, Mn 0.11%, P 0.012%, S0.0051%, Als 0.046%, Ti 0.060%, N 28ppm; the balance is Fe and unavoidable trace Element; wherein Ti=14.6 (C+N), so that Ti is fully and effectively combined with C and N, and C and N can be completely fixed and form TiC and TiN;

[0080] Carry out pre-desulfurization treatment on molten iron by KR method, after desulfurization treatment, S in molten iron is 0.0020%;

[0081]The molten iron is initially smelted in a top-bottom combined blowing converter. The loading capacity of scrap steel is 44 tons; the temperature control range of the end point of the converter is 1674°C, the control range of the carbon content of the end point of the converter is 0.038%, and the oxygen content of the end point of the converter is 488; Flow steel time 5′29″;

[0082] RH vacuum equipment is used for secondary refining of molten steel, and the oxygen content at the end of decarb...

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Abstract

The invention discloses DC06 automobile plate hot-rolled strip steel and a control method for the edge part warping defect of the DC06 automobile sheet hot-rolled strip steel, and belongs to the fieldof ferrous metallurgy. The DC06 automobile plate hot-rolled strip steel comprises the following components of, in percentage by mass, less than or equal to 0.0050% of C, less than or equal to 0.050%of Si, 0.050%-0.20% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.030%-0.060% of Als, 0.040%-0.070% of Ti, less than or equal to 0.0050% of N, and the balance Fe and inevitable trace elements. According to the DC06 automobile plate hot-rolled strip steel and the control method for the edge part warping defects thereof, by adjusting the contents of Ti, C and N elements, Ti, C and N are effectively combined to form titanium carbonitride, the deep drawing performance of a material is greatly improved, the production process steps of the strip steel are improved, edge part warping, caused by metallurgical defects, of a hot rolled plate is reduced through molten steel refining and casting blank finishing, by the adoption of the concave side pressing machine hammerhead and controlled cooling and controlled rolling, the defect that the edge part of a hot-rolled plate is warped due to upturning and tearing of the corner part of an intermediate billet in the rolling process is overcome.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, and more specifically relates to a method for controlling hot-rolled steel strips of DC06 automobile plates and edge warping defects thereof. Background technique [0002] In recent years, with the rapid development of the country's automobile industry, the market demand for automotive steel has increased sharply. Major steel companies have taken automotive steel as a strategic product, rapidly promoting product research and development, and continuously improving product quality. [0003] DC06 is a typical grade of automotive steel, and its composition is mainly ultra-low carbon aluminum-killed steel containing a certain amount of titanium. In order to ensure the number of continuous pouring furnaces in the production process of this type of steel, stopper rod blowing argon process is generally used in the production process of this type of steel. , The disadvantage of this process is th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14B22D11/12C21C7/00C21C7/10C22C33/06B22D11/16B21C37/00
CPCB21C37/00B22D11/12B22D11/1206B22D11/16C21C7/0006C21C7/10C22C33/06C22C38/001C22C38/002C22C38/004C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 张正群司小明朱彪娄亚彬冯胤明崔宇轩李应江刘启龙王泉范海宁舒宏福刘克王少刘青松
Owner MAANSHAN IRON & STEEL CO LTD