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Manufacturing method of atmosphere corrosion resistance steel

A technology of atmospheric corrosion-resistant steel and production methods, which is applied in the field of iron and steel smelting, can solve problems such as high cost and complex production process, and achieve the effects of improving production efficiency, shortening procedures, and reducing production costs

Inactive Publication Date: 2011-03-16
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

[0041] A certain iron and steel plant adopts the present invention to produce appearance as figure 1 High-strength atmospheric corrosion-resistant steel.

[0042] First, 141 tons of molten iron with a C content of 4.5% was added to the converter, and the actual tapping amount was 135 tons, of which about 6 tons of molten iron was burned, and then oxygen was blown in for smelting, and Cu and Ni were added 4 minutes before the end of the converter smelting molten steel plate, so that the contents of Cu and Ni in the molten steel are 0.25% and 0.15% respectively. When the C content in the converter molten steel is less than 0.05%, the steel is immediately tapped into the ladle. At this time, the measured value of the chemical composition of the molten steel is C 0.03 %, P 0.015%, S 0.010%.

[0043] Add 1.0 tons of lime and fluorite when 1 / 3 of the steel is tapped, including 800kg of lime and 200kg of fluorite; add 340kg of aluminum pre-deoxidizer Fe-Al; add Fe-Si-Mn alloy, Fe-Si...

Embodiment 2

[0049] A certain iron and steel plant adopts the present invention to produce appearance as figure 1 High-strength atmospheric corrosion-resistant steel.

[0050] First, 135.5 tons of molten iron with a C content of 4.0% is added to the converter, and the actual tapping amount is 130 tons, of which about 5.5 tons of molten iron is burned, and then oxygen is blown in for smelting, and Cu and Ni plates are added 2 minutes before the completion of molten steel smelting in the converter , so that the contents of Cu and Ni in molten steel are respectively 0.20% and 0.15%. When the C content in converter molten steel is less than 0.05%, the steel is tapped into the ladle immediately. At this time, the measured values ​​of the chemical composition of molten steel are C 0.04%, P 0.018%, S 0.011%.

[0051] Add 1.0 tons of lime and fluorite when 1 / 3 of the steel is tapped, including 800kg of lime and 200kg of fluorite; add 320kg of aluminum pre-deoxidizer Fe-Al, add Fe-Si-Mn alloy, Fe-...

Embodiment 3

[0058] A steel plant adopts this technology in the converter process to produce the appearance as figure 1 High-strength atmospheric corrosion-resistant steel.

[0059] First, 134 tons of molten iron with a C content of 4.0% was added to the converter, and the actual tapping amount was 129 tons, of which about 5 tons of molten iron was burned, and then oxygen was blown in for smelting, and Cu and Ni plates were added 5 minutes before the completion of molten steel smelting in the converter , so that the contents of Cu and Ni in molten steel are respectively 0.35% and 0.25%. When the C content in converter molten steel is less than 0.05%, the steel is immediately tapped into the ladle. At this time, the measured values ​​of the chemical composition of molten steel are C 0.05%, P 0.020%, S 0.015%.

[0060] When 1 / 3 of the steel is tapped, 1.0 tons of lime and fluorite (including 800kg of lime and 200kg of fluorite), 320kg of Fe-Al, Fe-Si-Mn alloy, Fe-Si and Fe-Cr alloy are adde...

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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 content of 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 iron and steel smelting, in particular to a method for smelting and producing atmospheric corrosion-resistant steel. Background technique [0002] Chinese patent CN100427630C discloses a process of "converter smelting molten steel → molten steel refining → continuous steel casting → section steel rolling" to produce yield strength (Rel) not less than 450MPa, tensile strength (Rm) not less than 550MPa, High-strength atmospheric corrosion-resistant section steel for railway wagons with a low-temperature impact energy (AKv) of not less than 24J at -40°C. The disclosed technology adopts five steps to produce high-strength atmospheric corrosion-resistant section steel, that is, the first step is molten steel smelting in converter, the second step is ladle pre-deoxidation and preliminary alloying, the third step is molten steel refining in LF furnace and RH furnace, and the third step The fourth step is castin...

Claims

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Application Information

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Patent Type & Authority Patents(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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