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Heat treatment method of low-carbon low-alloy vanadium-titanium microalloyed ultra-high strength cold-rolled steel sheet

A cold-rolled steel sheet and micro-alloying technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of insufficient elongation and high strength of cold-rolled steel sheets, and achieve the effects of increased elongation and high dislocation density.

Active Publication Date: 2019-04-05
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problem of high strength but insufficient elongation of cold-rolled steel sheets after the existing rolling process, thereby providing a fast method for producing ultra-high-strength cold-rolled steel sheets with a strength level of 800MPa-1200MPa and high elongation. Continuous annealing process with a cooling rate of 20°C / s to 1000°C / s in the cold stage

Method used

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  • Heat treatment method of low-carbon low-alloy vanadium-titanium microalloyed ultra-high strength cold-rolled steel sheet
  • Heat treatment method of low-carbon low-alloy vanadium-titanium microalloyed ultra-high strength cold-rolled steel sheet
  • Heat treatment method of low-carbon low-alloy vanadium-titanium microalloyed ultra-high strength cold-rolled steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The mass percentages of the elements of the cold-rolled steel sheet used in Example 1 are: carbon 0.15%, silicon 0.4%, manganese 1.9%, titanium 0.026%, vanadium 0.08%, and the balance is iron. The specific implementation method is as follows: first, heat the cold-rolled steel plate at a rate of 10 °C / s to 840 °C in the two-phase zone for 80 seconds, then use high-speed gas jet cooling to cool to room temperature at a cooling rate of 20 °C / s, and then heat it at 10 °C / s speed heating to 280°C for 280s for overaging treatment, then air cooling to room temperature.

[0029] The beneficial effect of this embodiment is: after heat treatment, the tensile strength of the cold-rolled steel plate is 926MPa, the yield strength is 452MPa, and the elongation reaches 14.8%. Although the tensile strength has decreased to a certain extent, the elongation has been greatly improved, and the toughness of the cold-rolled steel plate has been improved.

Embodiment 2

[0031] The mass percentages of the elements of the cold-rolled steel sheet used in Example 2 are: carbon 0.12%, silicon 0.8%, manganese 2.0%, titanium 0.031%, vanadium 0.08%, and the balance is iron. The specific implementation method is as follows: first, heat the cold-rolled steel plate at a rate of 10 °C / s to 840 °C in the two-phase zone for 80 seconds, then use high-speed gas jet cooling to cool to room temperature at a cooling rate of 50 °C / s, and then heat it at 10 °C. / s speed heating to 280°C for 280s for overaging treatment, then air cooling to room temperature.

[0032] After the heat treatment in Example 2, the tensile strength of the cold-rolled steel sheet is 970 MPa, the yield strength is 498 MPa, and the elongation reaches 13.5%.

Embodiment 3

[0034] The mass percentages of the elements in the cold-rolled steel sheet used in Example 3 are: carbon 0.11%, silicon 0.9%, manganese 1.7%, titanium 0.035%, vanadium 0.06%, and the balance is iron. The specific implementation method is as follows: first, heat the cold-rolled steel plate at a rate of 10 °C / s to 840 °C in the two-phase zone for 80 seconds, then use 90 °C water quenching to cool to room temperature at a cooling rate of 200 °C / s, and then heat it at 10 °C / s speed heating to 280°C for 280s for overaging treatment, then air cooling to room temperature.

[0035] After the heat treatment in Example 3, the tensile strength of the cold-rolled steel plate is 1072MPa, the yield strength is 701MPa, and the elongation reaches 10.8%.

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Abstract

The invention discloses a heat treatment method for a low-carbon low-alloy vanadium-titanium micro-alloying super-strength cold-roll steel sheet, and particularly relates to a continuous annealing technology. The purpose of improving the performance of the super-strength cold-roll steel sheet is achieved simply by changing the cooling speed at a continuous annealing fast cooling stage on the premise that chemical components of the cold-roll steel sheet do not need to be changed, a continuous annealing technological process does not need to be additionally added and the low cost is ensured. The continuous annealing technology includes the steps that the cold-roll steel sheet is heated to 780 DEG C to 860 DEG C at the speed of 10 DEG C / s to be subjected to heat preservation for 60 s to 120 s in a two-phase region; then the cold-roll steel sheet is cooled to the room temperature with the cooling speed ranging from 20 DEG C / s to 1000 DEG C / s; then the cold-roll steel sheet is heated to 200 DEG C to 280 DEG C with the speed of 10 DEG C / s to be subjected to heat preservation for 240 s to 280 s, and overaging treatment is conducted; and afterwards, air cooling is conducted till the room temperature is obtained. Due to treatment through the heat treatment method, the tensile strength of the cold-roll steel plate can reach 1227 MPa, the highest yield strength can reach 1099 MPa, the highest ductility can reach 14.8%, and the 800 MPa-1200 MPa-level super-strength cold-roll steel sheet with higher ductility can be produced.

Description

technical field [0001] The invention relates to a heat treatment method for an ultra-high-strength cold-rolled steel plate, belonging to the field of metal materials. Background technique [0002] The application of ultra-high-strength cold-rolled steel sheets can improve the performance of mechanical equipment on the basis of reducing its own weight, so as to achieve the effects of reducing energy consumption, reducing costs, and improving production efficiency, and can better achieve the goal of energy conservation and environmental protection. At present, the ultra-high-strength cold-rolled steel sheets in actual production are mainly martensitic and ferritic dual-phase steels, and their mechanical properties are mainly determined by the volume fraction and shape of martensite in the two-phase structure and the grain size and shape of ferrite. organizational factors. The continuous annealing process is particularly important in the production of ultra-high-strength cold-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C38/12C21D1/26C21D1/18C21D9/00
CPCC21D1/18C21D1/26C21D9/0081C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/12C22C38/14
Inventor 宋仁伯张凯陈驰李宜
Owner UNIV OF SCI & TECH BEIJING
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