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Method for reducing transverse cracks at corner of continuous casting billet of boron-steel-containing wide-thick plate

A technology for wide and thick slabs and continuous casting slabs, which is applied in the field of reducing transverse cracks at the corners of boron-containing steel wide and thick slabs continuous casting slabs, and can solve problems such as the lack of accurate general control parameters and process methods for corner transverse cracks

Inactive Publication Date: 2012-09-05
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] To sum up, at present, there are no systematic and specific research reports on the control technology of corner transverse cracks in the continuous casting process of boron-containing steel wide and thick slabs, and there is no accurate information on the control technology of boron-containing steel wide and thick slabs in the continuous casting production process. Published reports of specific and general control parameters and process methods for corner transverse cracks

Method used

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  • Method for reducing transverse cracks at corner of continuous casting billet of boron-steel-containing wide-thick plate
  • Method for reducing transverse cracks at corner of continuous casting billet of boron-steel-containing wide-thick plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The American standard A36 series boron-containing steel (A36-B) was prepared, and the weight percentages of other components except iron were shown in Table 2.

[0047] Table 2

[0048] steel type C Si mn P S Al B A36-1B 0.20-0.25 0.15-0.40 0.90-1.20 ≤0.025 ≤0.025 0.015-0.025 0.0010-0.0020

[0049] Firstly, the boron-containing steel is produced by using a wide and thick plate continuous casting machine. The process parameters of the continuous casting mold are set as follows: the water flow velocity in the water tank on the wide and narrow sides of the crystallizer is controlled at 6.6m / s and 6.9m / s respectively, and the inlet water temperature Control at 28°C; mold taper should be set to 1.05%; mold powder melting point 1120°C, viscosity 0.145 (Pa·s1300°C);

[0050] Then the steel plate is subjected to continuous casting and secondary cooling, and the process parameters are set as follows: the total water volume of the inner and out...

Embodiment 2

[0053] The American standard S355JR-B series boron-containing steel was prepared, and the weight percentages of other components except iron elements are shown in Table 3.

[0054] table 3

[0055] steel type C Si mn P S Al Nb B S355JR-B 0.15-0.20 0.15-0.35 1.35-1.50 ≤0.025 ≤0.025 0.020-0.00 0.010-0.030 0.0010-0.0020

[0056] Firstly, the boron-containing steel is produced by using a wide and thick plate continuous casting machine. The process parameters of the continuous casting crystallizer are set as follows: the water flow velocity in the crystallizer wide surface and narrow surface water tank is controlled at 7.0m / s and 7.3m / s respectively, and the inlet water temperature Control at 30°C; the taper of the mold should be set to 1.15%; the melting point of the mold powder is 1150°C, and the viscosity is 0.142 (Pa·s1300°C);

[0057] Then the steel plate is subjected to continuous casting and secondary cooling, and its process parameters ...

Embodiment 3

[0061] The American standard S355J0B series boron-containing steel was prepared, and the weight percentages of other components except iron elements are shown in Table 4.

[0062] Table 4

[0063] steel type C Si mn P S Al Nb B S355J0B 0.14-0.19 0.15-0.35 1.35-1.50 ≤0.025 ≤0.025 0.020-0.030 0.015-0.035 0.0010-0.0020

[0064] Firstly, a wide and thick plate continuous casting machine is used to produce boron-containing steel. The process parameters of the continuous casting crystallizer are set as follows: the water flow velocity in the crystallizer wide surface and narrow surface water tank is controlled in the range of 6.8m / s and 7.0m / s respectively, and the inlet The water temperature is controlled at 28°C; the taper of the mold should be set at 1.10%; the melting point of mold powder is 1120°C, and the viscosity is 0.145 (Pa·s1300°C);

[0065] Then carry out continuous casting secondary cooling on the steel plate, and its process parame...

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Abstract

The invention relates to the field of metallurgical technologies, and specifically relates to a method for reducing transverse cracks at a corner of a continuous casting billet of a boron-steel-containing wide-thick plate. The flow velocities of water in a wide-area water channel and a restricted-area water channel of a crystallizer are respectively controlled at 6.6-7.0 m / s and 6.9-7.3 m / s, and the temperature of water at an inlet is controlled at 28-30 DEG C; the conical degree of the crystallizer needs to be set into 1.05-1.15%; the melting point of casting powder of the crystallizer is less than or equal to 1150 DEG C, and the viscosity thereof is less than or equal to 0.145 (Pa.s1300 DEG C); the total water quantity of inner and outer arcs of two cold areas 1 is 95-110 l / m<2>; the total water quantity of left and right sides of a foot roll area is 35-45 l / m<2>; the specific water flow of two cold steel is controlled between 0.45 l / Kg and 0.65 l / Kg; and the water flow density at the corner of the casting billet and an area of 15 cm in the corner is less than or equal to 25 l / (m<2>.min). According to the invention, the defect rate of the corner of the boron-steel-containing wide-thick plate is reduced from 12.6% to a value less than 3.5%.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for reducing transverse cracks at corners of continuous casting slabs of wide and thick slabs containing boron. Background technique [0002] With the technological progress and rapid development of my country's transportation, petrochemical, heavy machinery, marine engineering, nuclear power and military industries, the requirements for large single-weight and large-section steel products are increasing, thus vigorously promoting low-alloy, high-strength steel products. Development of wide and thick plate continuous casting technology and equipment control technology. Boron-containing steel is a typical wide-thick plate continuous casting slab steel grade, which has the characteristics of low cost and high strength and toughness, and can be widely used in large-scale steel plates required for pressure vessels, transport vehicles, bridges, and power stations. [0003]...

Claims

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Application Information

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IPC IPC(8): C22C38/04B22D11/16
Inventor 祭程蔡兆镇朱苗勇罗森王卫领
Owner NORTHEASTERN UNIV
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