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Manufacturing method of steel

A production method and technology for molten steel, applied in the field of iron and steel metallurgy, can solve problems such as the inability to ensure stable yield of N element, and achieve the effects of increased yield and stable yield

Inactive Publication Date: 2011-04-06
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the alloying of V and N elements is realized by adding VN alloy (V content 78%, N content 12%), since the bulk specific gravity of VN alloy is about 3.4, which is less than the specific gravity of molten steel 6.8, adding The VN alloy exists on the interface between molten steel and steel slag. At this time, N element is also difficult to be absorbed by molten steel, and most of them form N 2 Molecular overflow, can not guarantee the stable yield of N element

Method used

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  • Manufacturing method of steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] This embodiment is used to produce shape as figure 1 The high-strength atmospheric corrosion-resistant steel shown.

[0057] In a converter with a nominal capacity of 120 tons (the actual tapping amount is between 125 and 135 tons), molten iron containing 4.3% C and capable of tapping 134 tons is added for primary smelting.

[0058] Add Cu plate and Ni plate 5 minutes before the completion of converter smelting molten steel, so that the contents of Cu and Ni in molten steel are 0.25% and 0.15% respectively. When the content of C in molten steel in converter is below 0.05%, tap steel immediately , At this time, the measured values ​​of the chemical components of molten steel are C 0.03%, P 0.015%, and S 0.010%. When 1 / 3 of the steel is tapped, 1.0 tons of a physical mixture of lime and fluorite (including 800 kg of lime and 200 kg of fluorite) is added to the ladle, and then 320 kg of FeAl (containing 40% of Al and the rest is Fe) is added, and FeSiMn, FeSi and FeCr are...

Embodiment 2

[0064] This embodiment is used to produce shape as figure 1 The high-strength atmospheric corrosion-resistant steel shown.

[0065] In a converter with a nominal capacity of 120 tons (the actual tapping amount is between 125 and 135 tons), molten iron containing 4.2% C and capable of tapping 135 tons is added for primary smelting.

[0066] Add Cu plate and Ni plate 5 minutes before the completion of converter smelting molten steel, so that the contents of Cu and Ni in molten steel are 0.20% and 0.45% respectively. When the C content of converter molten steel is below 0.05%, immediately tap the ladle , At this time, the measured values ​​of the chemical components of molten steel are C 0.04%, P 0.018%, and S 0.011%. When 1 / 3 of the steel is tapped, 1.0 tons of a physical mixture of lime and fluorite (including 800 kg of lime and 200 kg of fluorite) are added to the ladle, then 300 kg of FeAl (containing 40% of Al and the rest is Fe) is added, and FeSiMn, FeSi and FeCr are adde...

Embodiment 3

[0072] This embodiment is used to produce shape as figure 1 The high-strength atmospheric corrosion-resistant steel shown.

[0073] In a converter with a nominal capacity of 120 tons (the actual tapping amount is between 125 and 135 tons), molten iron containing 4.1% C and capable of tapping 131 tons is added for primary smelting.

[0074] Add Cu plate and Ni plate 5 minutes before the completion of converter smelting molten steel, so that the contents of Cu and Ni in molten steel are 0.50% and 0.25% respectively. When the C content of converter molten steel is below 0.05%, immediately tap the ladle , At this time, the measured values ​​of the chemical composition of molten steel are C 0.05%, P 0.020%, and S 0.015%. When 1 / 3 of the steel is tapped, 1.0 tons of a physical mixture of lime and fluorite (including 800 kg of lime and 200 kg of fluorite) are added to the ladle, then 300 kg of FeAl (containing 40% of Al and the rest is Fe) is added, and FeSiMn, FeSi and FeCr are add...

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Abstract

The invention provides a manufacturing method of steel, comprising the following steps: smelting the molten steel to ensure that the content of P in the molten steel is less than or equal to 0.035%, the content of S is less than or equal to 0.015% and the content of V is less than or equal to 0.15%; then adding Cu element and Ni element to the molten steel to ensure that the content of Cu in the molten steel is 0.20-0.60% and the content of Ni is 0.15-0.55%; tapping to a steel ladle when the content of C in the molten steel is below 0.05%; adding physical mixture of lime and fluorite and predeoxidizing agent to the steel ladle in the tapping process to ensure that the content of S in the molten steel is less than or equal to 0.012%; adding Cr element, Si element and Mn element to the molten steel to ensure that the content of Si in the molten steel is 0.25-0.60%, the content of Mn is 0.80-1.60% and the content of Cr is 0.20-0.80%; feeding Al simple substance to the molten steel to carry out final deoxidation; heating the molten steel in the condition of argon blowing to lead the steel slag to melt; then adding Al simple substance to the steel ladle to ensure that the content of S in the molten steel is less than or equal to 0.010%; and then adding C element to the molten steel to ensure that the content of C in the molten steel is 0.08-0.16%; feeding Al simple substance and alloy containing Ti, V and N to the molten steel to control that the content of acid-soluble aluminium in the molten steel is 0.025-0.040%, the content of Ti is 0.005-0.015%, the content of V is 0.08-0.15% and the content of N is 0.010-0.020%.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for producing steel. Background technique [0002] CN1793404A discloses a process of "converter smelting molten steel → molten steel refining → continuous steel casting → section steel rolling" to produce yield strength (R eL ) not less than 450MPa, tensile strength (R m ) not less than 550MPa, -40 ℃ low temperature impact absorption energy (Ak v ) method of high-strength atmospheric corrosion-resistant section steel for railway wagons not less than 24J. The method 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, and the third step is refining and refining of molten steel in LF furnace and RH furnace. Final alloying, the fourth step is casting, and the fifth step is section steel rolling. Thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C21C7/06C21C7/064C21C7/068C22C38/16
Inventor 刘明邓通武李军陈小龙徐华东李述生杨星地李清春
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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