Method for adjusting secondary cooling water amount and roll gap value of double-flow slab casting machine

The invention relates to a slab continuous casting machine and a technology of secondary cooling specific water volume, which is applied in the field of slab continuous casting and can solve the problems of reducing the mechanical properties and corrosion resistance of products, reducing the qualified rate of medium and thick plate flaw detection, and affecting the processing and service performance of steel. , to optimize the low magnification structure, reduce the incidence of cracks, and prevent bulging

Inactive Publication Date: 2012-03-21
ANYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, serious internal defects will reduce the mechanical properties and corrosion resistance of the product, cause the fracture inspection of ship plate steel to fail, aff

Method used

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  • Method for adjusting secondary cooling water amount and roll gap value of double-flow slab casting machine
  • Method for adjusting secondary cooling water amount and roll gap value of double-flow slab casting machine
  • Method for adjusting secondary cooling water amount and roll gap value of double-flow slab casting machine

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example 1

[0032] Example 1: Low-alloy aluminum-controlled steel

[0033] Steel type: Q345R;

[0034] Pouring molten steel composition: C0.17%-Si0.33%-Mn1.44%-P0.017%-S0.002%-Alt0.034%;

[0035] Ladle temperature: 1567°C; Tundish temperature: 1530°C;

[0036] Casting speed: 0.95m / min; Section: 210mm×1500mm; Solidification process billet density according to 7400kg / m 3 .

[0037] Water meter: 8# (specific water volume 0.50L / kg); Mold powder: AY-B

[0038] Table 2 Cooling water volume in each cooling zone of 8# water meter (drawing speed 0.95m / min, section 210mm×1500mm)

[0039] Cooling Zone Code location / part cooling form Cooling water volume (L / min) 1N Crystallizer narrow face foot roll spray water 26.0 1I+O Crystallizer Wide Face Roller spray water 96.0 2I+O The upper part of the curved section, inner arc+outer arc mist cooling 142.0 3I+O Middle part of the curved section, inner arc+outer arc mist cooling 181.0 4I+O The lo...

example 2

[0044] Example 2: plain carbon steel

[0045] Steel type: Q235B;

[0046] Pouring molten steel composition: C0.17%-Si0.18%-Mn0.44%-P0.018%-S0.009%;

[0047] Ladle temperature: 1577°C; Tundish temperature: 1540°C;

[0048] Casting speed: 0.9m / min; Section: 230mm×1500mm; Solidification process billet density is 7400kg / m 3 ;

[0049] Water meter: 4# (specific water volume 1.10L / kg); Mold flux: BY-2.

[0050] Table 4 Cooling water volume in each cooling zone of 4# water meter (drawing speed 0.9m / min, section 230mm×1500mm)

[0051] Cooling Zone Code location / part cooling form Cooling water volume (L / min) 1N Crystallizer narrow face foot roll spray water 56.0 1I+O Crystallizer Wide Face Roller spray water 256.0 2I+O The upper part of the curved section, inner arc+outer arc mist cooling 381.0 3I+O Middle part of the curved section, inner arc+outer arc mist cooling 436.0 4I+O The lower part of the curved section, inner a...

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Abstract

The invention discloses a method for adjusting the secondary cooling water amount and the roll gap value of a double-flow slab casting machine. In the double-flow slab casting machine, 12 cooling regions are formed for secondary cooling; 10 cooling water meters are provided; five grades, i.e., strong cooling: the secondary cooling water amount is 1.0-1.1 L/kg, medium cooling: the secondary cooling water amount is 0.8-0.9 L/kg, weak cooling: the secondary cooling water amount is 0.7-0.8 L/kg, medium-weak cooling: the secondary cooling water amount is 0.45-0.6 L/kg, and slight cooling: the secondary cooling water amount is 0.4-0.45 L/kg are divided to adapt to the cooling requirements of different types of steel respectively; the roll gap of a secondary cooling region support roll is consistent with the linear shrinkage rule of a casting blank from top to bottom, and decrease continually; and the roll opening between the outlet of a previous fan-shaped section and the inlet of a next fan-shaped section is kept consistent. By adopting the method, the internal cracking rate is lowered, the macrostructure of the casting blank is optimized, and the performance yield of steel is increased.

Description

technical field [0001] The invention belongs to the field of slab continuous casting, and in particular relates to a method for adjusting the secondary cooling water volume and roll gap value of a two-strand slab continuous casting machine to improve the internal quality of the slab by adjusting the secondary cooling water volume and optimizing the roll gap. Background technique [0002] At present, in order to obtain good quality of continuous casting slabs, generally according to different requirements of steel types and products, different process technologies are adopted in stages during continuous casting, such as ladle shroud protection pouring, tundish metallurgical technology, submerged nozzle design , Mold flux performance optimization, crystallizer liquid level fluctuation control, secondary cooling zone control, electromagnetic stirring technology and dynamic soft reduction technology, etc., to achieve the purpose of effectively controlling the quality of continuou...

Claims

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Application Information

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IPC IPC(8): B22D11/18B22D11/22
Inventor 李子林王三忠程德朝刘海强裴凤娟黄重高新军袁世堂盛士峰厚健龙徐党委袁爽陈波
Owner ANYANG IRON & STEEL
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