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High-strength and high-plasticity medium manganese cold-roll steel sheet and manufacturing method thereof

A technology of cold-rolled steel sheet and manufacturing method, which is applied to high-strength and high-plasticity medium-manganese cold-rolled steel sheet and its manufacturing field, can solve the problems of poor combination of strength and plasticity, high production cost, complicated process, etc., and achieve excellent mechanical properties, The effect of increased strength and plastic product, simple and economical ingredients

Inactive Publication Date: 2013-05-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main limitations of the existing advanced high-strength steel and its preparation methods are poor combination of strength and plasticity, complex composition, cumbersome process, etc.
The strength-plastic product of the existing advanced high-strength steel can only reach 18-32GPa*%. In order to pursue a high strength-plastic product, very high content of alloy elements is often used, or the technical means that are difficult to achieve with existing equipment, which makes the production cost too high. high

Method used

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  • High-strength and high-plasticity medium manganese cold-roll steel sheet and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The composition mass percentage of this high-strength, high-plasticity low-carbon medium-manganese cold-rolled steel sheet is: C: 0.19%, Mn: 7.5%, Si: 1.6%, Al: 0.03%, P: 0.015%, S: 0.0071% , and the rest is Fe.

[0026] After smelting, casting and forging, the steel billet is heated to 1200°C for 1 hour to complete austenitization, and then rolling is started. The starting temperature of rough rolling is 1150°C. The rolling start temperature is 1000°C, after 3 passes of finish rolling, the finish rolling temperature is 800°C, and air-cooled to room temperature after rolling. The hot rolling reduction rate is 91.7%.

[0027] Heat the hot-rolled sheet to 680°C for 10 hours, then take it out of the furnace and air cool it to room temperature. The annealed sheet was pickled and then cold-rolled in the first stage with a reduction of 36%. The first-stage cold-rolled sheet is annealed at 680°C for 16 hours, air-cooled to room temperature, pickled and then second-stage col...

Embodiment 2

[0030] The difference from Example 1 is that the annealing time of the final heat treatment is 0.5h. After the final heat treatment, the mechanical properties of the steel plate are tested according to the national standard. The tensile strength is 1085MPa, the elongation is 39.48%, and the strong-plastic product reaches 42.9GMPa*%.

Embodiment 3

[0032] The composition mass percentage of this high-strength, high-plasticity low-carbon medium-manganese cold-rolled steel sheet is: C: 0.21%, Mn: 7.0%, Si: 1.6%, Al: 0.02%, P: 0.012%, S: 0.0074% , and the rest is Fe.

[0033] After smelting, casting and forging, the steel billet is heated to 1200°C for 1 hour to complete austenitization, and then rolling is started. The starting temperature of rough rolling is 1150°C. The rolling start temperature is 1000°C, after 3 passes of finish rolling, the finish rolling temperature is 780°C, and air-cooled to room temperature after rolling. The hot rolling reduction rate is 87.5%.

[0034] Heat the hot-rolled sheet to 680°C for 12 hours, then take it out of the furnace and air cool it to room temperature. After pickling, the annealed sheet is cold-rolled in the first stage with a reduction of 45%. The first-stage cold-rolled sheet is annealed at 700°C for 12 hours, air-cooled to room temperature, pickled and then second-stage cold-...

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Abstract

The invention discloses a high-strength and high-plasticity medium manganese cold-roll steel sheet and a manufacturing method thereof, and belongs to the technical field of metal material manufacturing. The high-strength and high-plasticity medium manganese cold-roll steel sheet comprises the following main components in percentage by mass: 0.15-0.25% of C, 7-8% of Mn, 1.2-1.8% of Si, and less than or equal to 0.05% of Al. The components are smelted and cast into a blank, and then the casting blank is subjected to multi-pass hot rolling so as to obtain a hot-rolled plate; the hot-rolled plate is subjected to intermediate heat treatment two times and two stages of cold rolling; the temperature of the intermediate heat treatment is 80-120 DEG C larger than Ar1, and the heat preservation time is 8 hours and above; in the two stages of cold rolling, the deformation is 30-50%; and the temperature of final heat treatment of the cold-roll steel sheet is Ar1+70 DEG C and above, and the annealing time ranges from 10 minutes to 2 hours. The cold-roll steel sheet disclosed by the invention is simple in preparation method, low in cost, and wide in application prospect. A prepared high-strength and high-plasticity medium manganese cold-roll steel sheet has excellent mechanical properties, and the product of strength and elongation of the cold-roll steel sheet can be up to 44.9 GPa*%.

Description

technical field [0001] The invention belongs to the technical field of metal material manufacturing, and relates to a high-strength and high-plasticity medium-manganese cold-rolled steel plate and a manufacturing method thereof. Background technique [0002] With the rapid development of the automobile industry and the continuous improvement of human environmental protection and energy awareness, metal materials for automobiles are developing towards the two main goals of energy saving and safety. Therefore, on the one hand, the specific strength of metal materials should be improved to reduce the weight of the vehicle body and fuel consumption, which is conducive to saving energy and reducing environmental pressure; on the other hand, the collision energy absorption capacity of metal materials should be improved to convert most of the energy of the collision It is the plastic deformation of the material of the reasonable part of the body, so that the personal safety of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C38/04C21D8/02
Inventor 江海涛米振莉唐荻吴彦欣代乐乐段晓鸽李志超赵爱民
Owner UNIV OF SCI & TECH BEIJING
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