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Preparation method for hot-rolled low-density steel with strength and ductility product being greater than or equal to 40 GPa.%

A technology of low-density steel and strong plasticity, applied in the field of metal materials, can solve the problems of difficulty in meeting toughness requirements and decreased steel toughness, and achieve the effects of short production process, reduced steel plate density, and improved strength and plasticity

Active Publication Date: 2017-05-31
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the content of Al element added to the steel is high, the toughness of the steel will drop sharply, and it is difficult to meet the toughness requirements of the steel in the automotive field.

Method used

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  • Preparation method for hot-rolled low-density steel with strength and ductility product being greater than or equal to 40 GPa.%
  • Preparation method for hot-rolled low-density steel with strength and ductility product being greater than or equal to 40 GPa.%
  • Preparation method for hot-rolled low-density steel with strength and ductility product being greater than or equal to 40 GPa.%

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The chemical composition and density of Example 1 of the present invention are as shown in Table 1. The specific implementation process is: (1) smelting in a vacuum smelting furnace and casting into a slab, forging the slab into a slab, and eliminating the components in the slab during the forging process Segregation to remove defects such as shrinkage cavities and porosity; (2) Heating the slab to 1150°C, keeping it warm until the structure is homogenized, and then performing 6 passes of hot rolling. 87%, water-cooled to 240°C for coiling after rolling, and then air-cooled to room temperature to obtain a hot-rolled steel strip; (3) The hot-rolled steel strip is subjected to solution treatment, the solution treatment temperature is 900°C, the holding time is 60min, and then directly Water quenching to room temperature to obtain a finished low-density steel strip.

[0036] Observation and analysis of the structure of the finished steel strip shows that the structure of t...

Embodiment 2

[0038] The chemical composition and density of Example 2 of the present invention are exactly the same as those of Example 1, as shown in Table 1. The specific implementation process is: (1) smelting in a vacuum smelting furnace and casting into a billet, forging the billet into a slab, and the forging process (2) Heating the slab to 1180°C, keeping it warm until the structure is homogenized, and then performing 6 passes of hot rolling, the starting temperature of hot rolling is 1100°C, and the final rolling The temperature is 890°C, and the cumulative deformation is 92%. After rolling, it is water-cooled to 265°C for coiling, and then air-cooled to room temperature to obtain a hot-rolled steel strip; (3) The hot-rolled steel strip is subjected to solution treatment, and the solution treatment temperature is 950°C , the holding time is 60min, and then directly water quenched to room temperature to obtain the finished low-density steel strip.

[0039] Observation and analysis of ...

Embodiment 3

[0043] The chemical composition and density of Example 3 of the present invention are shown in Table 1, and the specific implementation process is the same as that of Example 1.

[0044] It is observed that the structure of the quenched steel strip is a dual-phase structure of ferrite + austenite, annealing twins exist in the austenite, and there are nanoscale vanadium precipitates in the grains. The results of the mechanical properties test are shown in Table 2.

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Abstract

The invention discloses a p reparation method for hot-rolled low-density steel with the strength and ductility product being greater than or equal to 40 GPa.% and belongs to the field of metal materials. Chemical components of the hot-rolled low-density steel with the strength and ductility product being greater than or equal to 40 GPa.% comprise, by mass, 0.6-1.0% of C, 8-12% of Mn, 7-11% of Al, 0.01-0.2% of V, less than or equal to 0.003% of P, less than or equal to 0.002% of S and the balance Fe and inevitable impurities. The preparation process comprises the steps of smelting, forging, hot rolling and solid solution hardening treatment, the structure of the obtained low-density steel comprises annealing twins, precipitates of nanoscale vanadium exist in the twins, and the strengthening effect is obvious. The steel has the characteristics of low density and high strength and ductility, and the strength and ductility product is greater than or equal to 40 GPa.%.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a method for preparing hot-rolled low-density steel with a strength-plasticity product ≥ 40 GPa·%. Background technique [0002] The development trend of modern automobiles is light weight, energy saving, anti-corrosion, safety and comfort. Reducing vehicle weight is one of the important measures to improve vehicle fuel economy and save energy consumption. The report of the World Aluminum Association pointed out that for every 10% reduction in vehicle weight, fuel consumption can be reduced by 6% to 8%; and for every 1L of fuel consumption reduction, 2.45kg of CO emissions will be reduced. 2 . [0003] Under the condition of ensuring safety, the lightweight of automobile structural materials can be realized by using high-strength steel and reducing its thickness. At present, a series of high-strength steels such as dual-phase steels, phase-transformation-induced plasticity steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/06C22C38/12C21D8/02C21D1/18
CPCC21D1/18C21D8/0226C21D8/0247C21D2211/001C21D2211/005C22C38/04C22C38/06C22C38/12
Inventor 赵征志袁洪涛周占明梁驹华梁江涛李枫康涛张才华何青唐荻刘强
Owner UNIV OF SCI & TECH BEIJING
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