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Method for improving performance uniformity of 780MPa-grade galvanized dual-phase steel

A dual-phase steel, uniformity technology, applied in the metallurgical field, can solve the problems of downstream customers' use effect, mechanical properties difference, hysteresis, etc., to reduce the local performance fluctuation range, improve the uniformity of mechanical properties, and improve the stability of mechanical properties. Effect

Pending Publication Date: 2021-07-13
唐山科技职业技术学院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The difference in mechanical properties in the length direction of the steel coil not only affects the objectivity of product quality evaluation, but also affects the use of downstream customers
In response to this phenomenon, in the past, the method of stabilizing the temperature of the soaking section of the heating furnace was used to improve it, but the effect is often not obvious, and there is a significant hysteresis

Method used

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  • Method for improving performance uniformity of 780MPa-grade galvanized dual-phase steel
  • Method for improving performance uniformity of 780MPa-grade galvanized dual-phase steel
  • Method for improving performance uniformity of 780MPa-grade galvanized dual-phase steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The chemical composition and mass percentage of the 780MPa grade galvanized dual-phase steel in this example are shown in Table 9, and the specifications are: thickness 1.8mm, width 1300mm, and length 1200m.

[0025] The method for improving the performance uniformity of 780MPa grade galvanized dual-phase steel includes the following steps:

[0026] (1) Temperature control of the second heating stage of the continuous annealing furnace: the temperature of the strip steel in the second heating stage is controlled at 765°C, and the residence time of the strip steel in the second heating stage is 1.2min;

[0027] (2) Temperature control of the soaking section of the continuous annealing furnace: the temperature of the strip steel in the soaking section is controlled at 775°C, and the residence time of the strip steel in the soaking section is 1.5min;

[0028] (3) Control the outlet temperature of the slow cooling section of the continuous annealing furnace: the outlet temp...

Embodiment 2

[0034] The chemical composition and mass percentage of the 780MPa-grade galvanized dual-phase steel in this example are shown in Table 1. The specifications are: thickness 1.2mm, width 1200mm, and length 1050m.

[0035] The method for improving the performance uniformity of 780MPa grade galvanized dual-phase steel includes the following steps:

[0036] (1) Temperature control of the second heating stage of the continuous annealing furnace: the temperature of the strip steel in the second heating stage is controlled at 775°C, and the residence time of the strip steel in the second heating stage is 1.4min;

[0037] (2) Temperature control of the soaking section of the continuous annealing furnace: the temperature of the strip steel in the soaking section is controlled at 765°C, and the residence time of the strip steel in the soaking section is 1.7min;

[0038] (3) Control the outlet temperature of the slow cooling section of the continuous annealing furnace: the outlet temperat...

Embodiment 3

[0044] The chemical composition and mass percentage of the 780MPa grade galvanized dual-phase steel in this example are shown in Table 1, and the specifications are: thickness 2.0mm, width 1300mm, and length 1050m.

[0045] The method for improving the performance uniformity of 780MPa grade galvanized dual-phase steel includes the following steps:

[0046] (1) Temperature control of the second heating stage of the continuous annealing furnace: the temperature of the strip steel in the second heating stage is controlled at 780°C, and the residence time of the strip steel in the second heating stage is 1.3min;

[0047] (2) Temperature control of the soaking section of the continuous annealing furnace: the temperature of the strip steel in the soaking section is controlled at 780°C, and the residence time of the strip steel in the soaking section is 1.1min;

[0048] (3) Temperature control at the outlet of the slow cooling section of the continuous annealing furnace: the outlet t...

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Abstract

The invention discloses a method for improving performance uniformity of 780MPa-grade galvanized dual-phase steel, which comprises the following steps: (1) heating second-stage temperature control: controlling the temperature of strip steel at the heating second-stage to be 750-780 DEG C, and staying for 1-2 minutes; (2) controlling the temperature of a soaking section: controlling the temperature of the strip steel in the soaking section to be 750-780 DEG C, and keeping the standing time for 1-2 minutes; (3) controlling the temperature of an outlet of a slow cooling section: controlling the temperature of the outlet of the slow cooling section at 660-700 DEG C, and controlling the cooling speed of the slow cooling section at 10-20 DEG C / s; and (4) controlling the speed of the strip steel in the continuous annealing furnace: controlling the speed of the strip steel in the continuous annealing furnace to be 80-120m / min. By adjusting the phase change degree of the microscopic structure, the mechanical property uniformity is improved, the local performance fluctuation range is narrowed, and the mechanical property stability in the length direction of the strip steel can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for improving the performance uniformity of 780MPa-grade galvanized dual-phase steel. Background technique [0002] When the continuous hot-dip galvanizing production line produces 780MPa ultra-high-strength dual-phase steel strip, affected by the temperature fluctuation of the heating furnace, the local mechanical properties of the steel coil fluctuate in a large range, and the performance difference of the strip head, strip middle, and strip end of the entire strip sometimes reaches as high as 40MPa above. The difference in mechanical properties in the length direction of the steel coil not only affects the objectivity of product quality evaluation, but also affects the use of downstream customers. In view of this phenomenon, in the past, the method of stabilizing the temperature of the soaking section of the heating furnace was used to improve it, but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D9/52C21D11/00C22C38/02C22C38/28C22C38/26C22C38/38C22C38/22C22C38/32
CPCC21D1/26C21D9/52C21D11/00C22C38/02C22C38/28C22C38/26C22C38/38C22C38/22C22C38/32
Inventor 陈俊东陈礼斌杨丽赵明琪关晓光孙雅平吴静张明
Owner 唐山科技职业技术学院
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