Continuous casting method of steel for sulfuric acid dew point corrosion resistance

A dew-point corrosion and sulfuric acid-resistant technology, applied in the field of continuous casting, can solve the problems of high price, unfavorable greenness, saving, increased production cost, etc., and achieve the effect of improving the casting rate, reducing the peeling process, and reducing the production cost.

Active Publication Date: 2019-08-09
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But Ni is expensive, and the production cost will increase greatly, which is not conducive to the development of the concept of green and saving.

Method used

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  • Continuous casting method of steel for sulfuric acid dew point corrosion resistance
  • Continuous casting method of steel for sulfuric acid dew point corrosion resistance
  • Continuous casting method of steel for sulfuric acid dew point corrosion resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: The specific process of the continuous casting method of the sulfuric acid dew point corrosion resistant steel is as follows.

[0034] The continuous casting process adopts full protection pouring, the superheat of the tundish is 20°C, and the argon blowing flow rate of the long nozzle of the large ladle is 42L / min; the composition of the tundish covering agent is CaO+MgO=55.3%, SiO 2 =23%, Al 2 o 3 =10.5%, T(C)=1.2%, H 2 O=0.09%, TFe=2.0%, the balance is ash, and the density of the covering agent is 0.88g / cm 3 . The argon blowing flow rate of the submerged nozzle is 8L / min, the insertion depth of the nozzle is 100mm, the crystallizer liquid level adopts automatic control technology, and the liquid level fluctuation is 2mm; the free C in the low-carbon mold flux is ≤1.0%, and the binary alkalinity R=CaO / SiO 2 =1.05, the viscosity at 1300°C is 7.9Pa•S, and the density is 0.68kg / dm 3, The softening temperature is 1130°C, and the melting point is 1152°...

Embodiment 2

[0038] Embodiment 2: The specific process of the continuous casting method of the sulfuric acid dew point corrosion resistant steel is as follows.

[0039] The continuous casting process adopts full protection pouring, the superheat of the tundish is 22°C, the argon blowing flow rate of the long nozzle of the large ladle is 30L / min; the composition of the tundish covering agent is CaO+MgO=52%, SiO 2 =30%, Al 2 o 3 =10.5%, T(C)=3.5%, H 2 O=0.10%, TFe=2.0%, the balance is ash, and the density of the covering agent is 0.92g / cm 3 . The argon blowing flow rate of the submerged nozzle is 7L / min, the insertion depth of the nozzle is 120mm, the crystallizer liquid level adopts automatic control technology, and the liquid level fluctuation is 3mm; the free C in the low-carbon mold flux is ≤1.0%, and the binary alkalinity R=CaO / SiO 2 =1.15, the viscosity at 1300°C is 7.2Pa•S, and the density is 0.78Kg / dm 3 , The softening temperature is 1140°C, and the melting point is 1162°C. T...

Embodiment 3

[0042] Embodiment 3: The specific process of the continuous casting method of the sulfuric acid dew point corrosion resistant steel is as follows.

[0043] The continuous casting process adopts full protection pouring, the superheat of the tundish is 25°C, the argon blowing flow rate of the long nozzle of the ladle is 46L / min; the composition of the tundish covering agent is CaO+MgO=58.2%, SiO 2 =21%, Al 2 o 3 =15%, T(C)=2.8%, H 2 O=0.5%, TFe=2.0%, the balance is ash, and the density of the covering agent is 0.98g / cm 3 . The argon blowing flow rate of the submerged nozzle is 5L / min, the insertion depth of the nozzle is 130mm, the crystallizer liquid level adopts automatic control technology, and the liquid level fluctuation is 2.5mm; the free C in the low-carbon mold powder is ≤1.0%, and the binary alkalinity R=CaO / SiO 2 =1.20, the viscosity at 1300°C is 5.9Pa•S, and the density is 0.88Kg / dm 3 , The softening temperature is 1160°C, and the melting point is 1172°C. The ...

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Abstract

The invention discloses a continuous casting method for steel resistant to sulfuric acid dew point corrosion. The technology comprises the following steps: (1) whole-process protection pouring is adopted in the continuous casting process, argon seal protection pouring is adopted for a large ladle long nozzle, wherein argon flow is 30~50 L / min, and an immersion type nozzle adopts a concave type nozzle, wherein the argon flow is 5~8 L / min; (2) the components of a covering agent adopted by the molten steel level of a middle ladle comprise, by weight, CaO and MgO with the total content greater than or equal to 52.0% but less than or equal to 58.2%, SiO2 with the content less than or equal to 30%, Al2O3 with the content less than or equal to 15%, T(C) with the content less than or equal to 3.5%, H2O with the content less than or equal to 0.5%, TFe with the content less than or equal to 2.0% and the balance ash with the density of 0.93+ / -0.05g / cm<3>; (3) a crystallizer uses low-carbon high-alkalinity casting powder, the content of free C is less than or equal to 1.0%, and binary basicity R is equal to CaO / SiO2, namely1.05~1.20; and (4) a pulling speed is controlled with 0.70~0.85m / min, the liquid level of the crystallizer is detected in a full-automatic mode, liquid level fluctuation is within 3.0mm, a continuous casting secondary cooling zone adopts a combination mode of electromagnetic stirring, light pressing and heavy pressing, and a cooling mode adopts front weak cooling and rear strong cooling. According to the continuous casting method, a surface crack of a casting blank can be reduced, a peeling process caused by the defect of the casting blank can be eliminated, the yield of the cast blank is improved, and the production cost is effectively reduced.

Description

technical field [0001] The invention relates to a continuous casting method, in particular to a continuous casting method for sulfuric acid dew point corrosion resistant steel. Background technique [0002] The development of steel is inseparable from the cooperation of anti-corrosion technology, especially the corrosion resistance of structures has become a major issue of concern in the world today. In a sense, steel anti-corrosion technology is the key condition to ensure the normal use and durability of structural steel . With the rapid development of science and technology and the gradual updating of materials used by production enterprises, the application fields of steel plates resistant to low temperature dew point corrosion of sulfuric acid continue to expand, and are more and more favored by various production enterprises. [0003] 09CrCuSb steel (ND steel) is developed for the purpose of heat exchange of coal-fired boilers, oil-fired boilers, electric furnaces, sm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111B22D11/22B22D11/16
CPCB22D11/111B22D11/16B22D11/225
Inventor 王强王云阁尹绍江刘志勇臧淼郝鑫李可斌刘伟建郑治秀
Owner TANGSHAN IRON & STEEL GROUP
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