Method for improving homogeneous degree of low-alloy high-tensile structural steel wide and thick plate continuous casting billets

A low-alloy, high-strength, structural steel technology, applied in the field of continuous casting, can solve problems such as center segregation and homogeneity, achieve the effect of improving homogeneity, high overall homogeneity, and meeting the requirements of use

Active Publication Date: 2017-07-07
TANGSHAN IRON & STEEL GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The patent application CN201610172935.7 "Central segregation control method of 30CrMo round billet steel billet" is mainly aimed at round pipe billet, which has certain benefits for the improvement of the quality of 30CrMo round billet steel billet. Proposed technical measures for central segregation and homogeneity of wide and thick plate continuous casting slabs of alloy high-strength structural steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: A method for improving the homogeneity of a low-alloy high-strength structural steel wide-thick slab continuous casting slab The specific process is as follows.

[0017] Continuous casting produces Q690D continuous casting slabs with a cross-sectional size of 1800mm×260mm. The casting speed of the casting machine is 0.87m / min, and the casting speed is kept stable. The superheat of the molten steel in the tundish is 20°C; Cold control technology dynamically adjusts the water distribution in each secondary cooling zone based on steel type and casting speed. At the same time, the reduction is carried out according to the distribution of solid phase ratio under light reduction and heavy pressure at the end of solidification. The reduction rate under heavy pressure is 0.03mm / s, and the length of the reduction interval is 10m; under heavy pressure, start from fs=0.9. , where the range of solid phase ratio fs under light pressure is between 0.5 and 0.9, and the r...

Embodiment 2

[0019] Embodiment 2: The specific process of the method for improving the homogeneity of the low-alloy high-strength structural steel wide-thick slab continuous casting slab is as follows.

[0020] Continuous casting produces Q690D steel with a cross-sectional size of 1800mm×265mm. The casting speed of the casting machine is 0.88m / min, and the casting speed is kept stable. The superheat of molten steel in the tundish is 20℃; the dynamic secondary cooling control technology is adopted, Steel type and casting speed to dynamically adjust the water distribution in each secondary cooling zone. At the same time, light reduction and solidification end heavy pressure are used to reduce according to the distribution of solid phase ratio. The reduction rate under heavy pressure is 0.03mm / s, and the length of the reduction interval is 8m; under heavy pressure, start from fs=0.9. , wherein the range of solid phase ratio fs under light pressure is between 0.5 and 0.9, and the range of soli...

Embodiment 3

[0022] Embodiment 3: The specific process of the method for improving the homogeneity of the low-alloy high-strength structural steel wide-thick slab continuous casting slab is as follows.

[0023] Continuous casting produces Q690D steel with a cross-sectional size of 1800mm×265mm. The casting speed of the casting machine is 0.78m / min, and the casting speed is kept stable. The superheat of molten steel in the tundish is 30℃; the dynamic secondary cooling control technology is adopted, Steel type and casting speed to dynamically adjust the water distribution in each secondary cooling zone. At the same time, light reduction and solidification end heavy pressure are used to reduce according to the distribution of solid phase ratio. The reduction rate under heavy pressure is 0.03mm / s, and the length of the reduction interval is 9m; under heavy pressure, start from fs=0.9. , wherein the range of solid phase ratio fs under light pressure is between 0.5 and 0.9, and the range of soli...

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Abstract

The invention discloses a method for improving the homogeneous degree of low-alloy high-tensile structural steel wide and thick plate continuous casting billets. In the continuous casting process, the pulling speed of a casting machine is controlled to range from 0.78m/min to 0.90 m/min, and the superheat degree of tundish molten steel ranges from 20 DEG C to 30 DEG C; and dynamic secondary cooling control and solidification tail end heavy downward pressing are adopted. According to the method, the center segregation of the low-alloy high-tensile structural steel wide and thick plate continuous casting billets is reduced by mainly and comprehensively taking technical measures such as casting machine pulling speed stabilization, tundish superheat degree lowering, secondary cooling dynamic control and solidification tail end heavy downward pressing control, and the homogeneous degree of the continuous casting billets is improved. After the method is implemented, the effect is superior to the effect of an existing light downward pressing technology, the center segregation is well improved, the overall quality is good, the homogeneous degree is high, and the requirement for using low-alloy and high-strength structural steel can be well met.

Description

technical field [0001] The invention relates to a continuous casting method, in particular to a method for improving the homogeneity of continuous casting slabs of low-alloy high-strength structural steel wide and thick plates. Background technique [0002] Low-alloy high-strength structural steel, it has good toughness, plasticity, welding performance, and processing technology, good corrosion resistance, high strength and low cold-brittle critical transition temperature. It is mainly used in the manufacture of large-scale steel structures such as buildings, bridges, ships, vehicles, railways, high-pressure vessels, automobiles, tractors, and large-scale military projects. Low-alloy high-strength structural steel is subject to dynamic loads, impact loads and complex forces when used as structural parts, so it has very strict requirements on the quality of cast slabs and rolled products. In particular, it must reduce central segregation to ensure The homogeneity of the mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16B22D11/22
CPCB22D11/16B22D11/225
Inventor 祭程张洪波朱苗勇刘铁力刘志远王重君王云阁程巨广
Owner TANGSHAN IRON & STEEL GROUP
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