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Manufacturing method of atmosphere corrosion resistance steel

A technology for atmospheric corrosion-resistant steel and a production method, applied in the field of iron and steel smelting, can solve problems such as high cost and complicated production process, and achieve the effects of improving production efficiency, shortening processes, and reducing production costs

Inactive Publication Date: 2010-03-03
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, its production process is more complicated and the cost is higher.

Method used

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  • Manufacturing method of atmosphere corrosion resistance steel

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A steel plant adopts the present invention to produce the appearance of the converter process figure 1 Of high-strength atmospheric corrosion-resistant steel.

[0040] First, 141 tons of molten iron with a C content of 4.5% are added to the converter. The actual tapping volume is 135 tons, of which about 6 tons of molten iron are burnt. Then oxygen is blown into the smelting furnace. Cu and Ni are added 4 minutes before the end of the converter smelting molten steel. Plate, make the content of Cu and Ni in the molten steel 0.25% and 0.15% respectively. When the C content in the converter molten steel is less than 0.05%, immediately tap the steel into the ladle. At this time, the measured value of the molten steel chemical composition is C 0.03 %, P 0.015%, S 0.010%.

[0041] Start adding 1.0 tons of lime and fluorite at 1 / 3 of the tapping time, including 800kg of lime and 200kg of fluorite; adding 340kg of aluminum pre-deoxidizer Fe-Al; adding Fe-Si-Mn alloy, Fe-Si alloy, ...

Embodiment 2

[0047] A steel plant adopts the present invention to produce the appearance of the converter process figure 1 Of high-strength atmospheric corrosion-resistant steel.

[0048] First, 135.5 tons of molten iron with 4.0% C content is added to the converter. The actual tapping volume is 130 tons, of which about 5.5 tons of molten iron are burned. Then oxygen is blown in for smelting. Cu and Ni plates are added 2 minutes before the converter smelting molten steel is completed. , Make the content of Cu and Ni in the molten steel 0.20% and 0.15%, respectively. When the C content in the converter molten steel is less than 0.05%, immediately tap the steel into the ladle. At this time, the measured value of the chemical composition of the molten steel is C 0.04%, P 0.018%, S 0.011%.

[0049] Start adding 1.0 tons of lime and fluorite at 1 / 3 of the tapping time, including 800kg of lime and 200kg of fluorite; adding 320kg of aluminum pre-deoxidizer Fe-Al, adding Fe-Si-Mn alloy, Fe-Si alloy, ...

Embodiment 3

[0056] A steel plant uses this technology to produce the appearance of the converter process figure 1 Of high-strength atmospheric corrosion-resistant steel.

[0057] First, 134 tons of molten iron with a C content of 4.0% are added to the converter. The actual tapping volume is 129 tons, of which about 5 tons of molten iron are burned. Then oxygen is blown into the smelting furnace. Cu and Ni plates are added 5 minutes before the converter smelting molten steel. , Make the content of Cu and Ni in the molten steel 0.35% and 0.25% respectively. When the C content in the converter molten steel is less than 0.05%, the steel will be tapped into the ladle immediately. At this time, the measured value of the chemical composition of the molten steel is C 0.05%, P 0.020%, S 0.015%.

[0058] Start adding 1.0 tons of lime and fluorite (including 800kg of lime and 200kg of fluorite), 320kg of Fe-Al, adding Fe-Si-Mn alloy, Fe-Si and Fe-Cr alloy to carry out Si and Mn at 1 / 3 of the tapping ti...

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Abstract

The invention discloses a manufacturing method of atmosphere corrosion resistance steel, comprising the following steps: smelting the molten steel; tapping the steel to a steel ladle when the contentof C is less than 0.05%; adding lime, fluorite, predeoxidizing agent and alloy to the steel ladle; heating the steel ladle; adding aluminium pellets and various alloys to ensure that the molten steelcomprises the following components: 0.08-0.16% of C, 0.25-0.60% of Si, 0.80-1.60% of Mn, <=0.035% of P, <=0.015% of S, 0.20-0.60% of Cu, 0.15-0.55% of Ni, 0.20-0.80% of Cr and <=0.14% of V; controlling the temperature of the steel ladle to be in a range of 1548+ / -20 DEG C; then carrying out continuous casting to obtain rolled blanks. The performance of the atmosphere corrosion resistance steel inthe invention can reach over 450 MPa and 24 J, and the invention is also characterized by simple and convenient process and low cost, thus being applicable to rolling various structural steels which are used in atmosphere corrosion atmosphere.

Description

Technical field [0001] The invention relates to the technical field of steel smelting, in particular to a smelting production method of atmospheric corrosion resistant steel. Background technique [0002] Chinese patent CN100427630C discloses a process of "converter smelting molten steel → molten steel refining → continuous casting → section steel rolling" to produce yield strength (Rel) not less than 450MPa, tensile strength (Rm) not less than 550MPa, -40℃ low temperature impact energy (AKv) not less than 24J high-strength atmospheric corrosion-resistant steel for railway freight cars. The disclosed technology uses 5 steps to produce high-strength atmospheric corrosion-resistant steel, that is, the first step is converter smelting molten steel, the second step is ladle pre-deoxidation and preliminary alloying, and the third step is molten steel refining in LF furnace and RH furnace. The fourth step is casting, and the fifth step is section steel rolling. [0003] Using the techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16B22D1/00B22D11/00C22C33/06C22C38/58C22C38/46C22C38/42
Inventor 刘明邓通武熊元波陈小龙李军王代文陶功名江南红
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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