Hot rolling multiphase steel and production method thereof

A production method and technology for complex phase steel, applied in the field of steelmaking, can solve the problem of high cost, achieve good matching of strength and plasticity, and reduce costs

Active Publication Date: 2013-09-11
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This hot-rolled multi-phase steel adds more elements such as Si, Cr, Ti, etc., and the cost is relatively high

Method used

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  • Hot rolling multiphase steel and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The smelted molten steel conforming to the composition described in Example 1 in Table 1 was cast into a billet, and then the billet was heated up to 1280° C. in stages in the furnace and kept for 30 minutes for rolling. Among them, the starting temperature of rough rolling is 1230°C, 6 passes of rough rolling, the total deformation in the rough rolling stage is 65%, the exit temperature of rough rolling is 1050°C; the entrance temperature of finish rolling is 1030°C, 7 passes of finish rolling, The total deformation in the finish rolling stage is 35%, and the exit temperature of finish rolling is 900°C. After the steel plate is rolled, it enters into water cooling, the water cooling cooling rate is 25°C / s, it is cooled to 610°C, coiled, and the final thickness of the hot rolled plate is 3.2mm. The yield strength (Rp 0.2 ), tensile strength (Rm), elongation (A 80 ), yield strength ratio (n value) and other mechanical properties are shown in Table 2. The microstructur...

Embodiment 2

[0024] The smelted molten steel conforming to the composition described in Example 2 in Table 1 was cast into a billet, and then the billet was heated to 1260° C. in stages in the furnace and then kept for 35 minutes for rolling. Among them, the rough rolling start temperature is 1200°C, the rough rolling is 6 passes, the total deformation in the rough rolling stage is 70%, the rough rolling exit temperature is 1030°C; the finish rolling entrance temperature is 1010°C, and the finish rolling is 7 passes , the total deformation in the finish rolling stage is 30%, and the exit temperature of finish rolling is 880°C. After the steel plate is rolled, it enters water cooling. The cooling rate of the water cooling is 25°C / s, and it is cooled to 620°C. It is coiled, and the final thickness of the hot-rolled plate is 3.0mm. The yield strength (Rp 0.2 ), tensile strength (Rm), elongation (A 80 ), yield strength ratio (n value) and other mechanical properties are shown in Table 2.

Embodiment 3

[0026] The smelted molten steel conforming to the composition described in Example 3 in Table 1 was cast into billets, and then the billets were heated up to 1300° C. in stages in the furnace and kept for 30 minutes for rolling. Among them, the rough rolling start temperature is 1250°C, the rough rolling is 6 passes, the total deformation in the rough rolling stage is 65%, the rough rolling exit temperature is 1050°C; the finish rolling entrance temperature is 1030°C, and the finish rolling is 7 passes , the total deformation in the finish rolling stage is 35%, and the exit temperature of finish rolling is 900°C. After the steel plate is rolled, it enters into water cooling. The cooling rate of the water cooling is 25°C / s, and it is cooled to 600°C. It is coiled, and the final thickness of the hot-rolled plate is 3.8mm. The yield strength (Rp 0.2 ), tensile strength (Rm), elongation (A 80 ), yield strength ratio (n value) and other mechanical properties are shown in Table 2....

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Abstract

The invention provides a hot rolling multiphase steel, which is produced by employing a billet-heating furnace-rough rolling-finish rolling-reeling process flow, and the obtained hot rolling multiphase steel contains the following chemical components by mass: 0.07-0.10% of C, 0.50-1.00% of Si, 0.90-1.50% of Mn, no more than 0.02% of P, no more than 0.004% of S, no more than 0.05% of Al, 0.0005-0.0010% of B, no more than 0.0050% of N, 0.060-0.150% of Ti, and the rest of Fe and inevitable impurities. The invention provides the hot rolling multiphase steel, and in the condition that the production technology cost is not changed, the B element can replace the Cr element in the hot rolling multiphase steel, thereby reducing alloy cost; the intensity and plasticity of the obtained hot rolling multiphase steel are matched well.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a hot-rolled multiphase steel and a production method thereof. Background technique [0002] Following the ferritic-martensitic dual-phase steel, limited by its hole-expanding and flanging performance, a high-hole-expanding steel appeared. The structure includes ferritic-bainite dual-phase or pure ferrite or pure bainite three-phase steel. However, with the further improvement of strength, the application of high reaming steel is also limited, and it is difficult to further improve the strength by using bainite as the strengthening phase. In order to meet the lightweight requirements of automobiles and meet the requirements of cold deformation properties such as hole expansion and flanging, a new steel grade was developed: multi-phase steel. The multi-phase steel comprehensively utilizes various organizational advantages and carries out a reasonable ratio. The composition o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 郭佳姚志强朱国森李飞潘辉赵运堂
Owner SHOUGANG CORPORATION
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