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Manufacturing method of high-manganese strip steel with high strength and plasticity

A manufacturing method and strip steel technology, applied in the direction of manufacturing tools, other manufacturing equipment/tools, metal rolling, etc., can solve the problems that have not been seen in thin slab continuous casting and rolling original strip steel, and achieve broad application prospects and potential , serious element segregation, and excellent thermal processing performance

Active Publication Date: 2010-12-29
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no thin slab continuous casting and rolling original strip steel

Method used

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  • Manufacturing method of high-manganese strip steel with high strength and plasticity
  • Manufacturing method of high-manganese strip steel with high strength and plasticity
  • Manufacturing method of high-manganese strip steel with high strength and plasticity

Examples

Experimental program
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Effect test

Embodiment 1

[0079] It is smelted in an electric furnace, and the composition is qualified and placed in an 18-ton ladle. The tapping temperature is 1550°C. The main components of the high-manganese molten steel are as follows (wt%): Mn 23.0%, Si 2.8%, Al 3.0%, C 0.04%, P-1 , The rolling force is about 2000KN, and it is air-cooled to the target temperature of 700°C for coiling.

[0080] Sampling, solution treatment (water quenching) at 1100°C for ≥1 minute, then pickling, cold rolling, with a reduction of 40%; then solution treatment (water quenching) at 1100°C for ≥2 minutes , then pickling, flattening, slitting according to product requirements, and processing into finished rolls. The mechanical properties of strip steel are as Figure 4 shown.

[0081] Transmission electron microscope analysis shows that the structure of strip steel is a single austenite phase before stretching, and the structure is still austenite after stretching, forming a large number of twins with a distance of te...

Embodiment 2

[0083]Smelted in an electric furnace, the composition is qualified and placed in an 18-ton ladle, the tapping temperature is 1570°C, and the main components of the high manganese molten steel are as follows (wt%): Mn 15.0%, Si 3.5%, Al 3.2%, C 0.03%, P-1 , The rolling force is about 2200KN, and the head is water-cooled to the target temperature of 600°C for coiling.

[0084] Sampling, after solution treatment (water quenching) at 1050°C, pickling, cold rolling, the reduction is 50%, then solution treatment (water quenching) at 1050°C, pickling, smoothing, slitting according to product requirements , processed into finished rolls. The mechanical properties of strip steel are as Figure 4 shown.

[0085] Figure 4 It is the mechanical property index of embodiment 1,2 sample. In the figure, the mechanical performance index of Example 1: tensile strength 640-660Mpa; elongation 50-60%; yield strength 250-280Mpa. After calculation: the strong-plastic product is 32,000-39,600Mpa%...

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Abstract

The invention relates to a manufacturing method of high-manganese strip steel with high strength and plasticity, which comprises the following steps: 1) smelting: the high-manganese strip steel mainly comprises the following components by weight percent: less than 0.2% of C, 10-30% of Mn, 1-6% of Si, 1-8% of Al and the balance of Fe; 2) thin strip continuous casting: the roll speed and the rate of a rotational line are 45-150m.min; the degree of superheat of a tundish during casting is 25-60 DEG C; the liquid level of molten steel is 150-350mm; and a roll gap of a crystallizing roll is preset to be 1.8-3.0mm; 3) on-line hot rolling: the rolling temperature is 950-1150 DEG C, the rolling reduction is 10-50%, the strain rate is 10-45s-1, and the thickness of the strip steel is 1.0-1.6mm; 4) coiling: the coiling temperature is 400-750 DEG C; 5) acid cleaning; 6) leveling; and 7) carrying out shear processing for forming a finished product coil. The manufacturing method can obtain a high-manganese steel structure with high equiaxed crystal ratio and even complete equiaxed crystal, avoid an obvious columnar crystal interface, prevent the phenomenon of shrinkage porosity or aggregation of inclusions, lead performance indexes including yield strength, elongation rate, yield-strength ratio and the like to float in a larger range and further meet the specific needs of users.

Description

technical field [0001] The invention relates to a method for manufacturing high-strength-plastic high-manganese strip steel, in particular to a method for manufacturing Fe-Mn-Al-Si-based high-manganese strip steel with a strength-plastic content of more than 30,000 Mpa%. Background technique [0002] High manganese steel has been widely used as impact, friction and wear workpieces for a hundred years, but the use of strips as steel for engineering structures has gradually become more and more clear in the past 10 years, and has now attracted widespread attention in the industry. After appropriate composition design and manufacturing process, high manganese plate and strip steel exhibits excellent strength, plasticity, work hardening, and impact resistance safety, and shows attractive application potential in high-speed trains, automobiles, elevated buildings and other fields. (Fang Yuan, Liang Gaofei, et al., "High manganese plate and strip steel and its manufacturing techno...

Claims

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Application Information

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IPC IPC(8): B23P23/04B21B1/46C22C33/04C22C38/06B22D11/16C21D8/02
Inventor 梁高飞方园于艳刘俊亮
Owner BAOSHAN IRON & STEEL CO LTD
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