A method for improving the yield rate of semi-steelmaking mn alloy

A technology of medium carbon ferromanganese alloy and tons of steel, which is applied in the field of improving the yield of Mn alloy in semi-steelmaking, can solve the problems of high oxygen activity at the end point and low yield of Mn alloy in tapping, and achieve alloy yield The effect of increasing the rate and reducing the oxygen activity at the end point

Active Publication Date: 2016-06-08
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for improving the yield of semi-steel steelmaking Mn alloys in order to overcome the high terminal oxygen activity in the existing semi-steel smelting method which leads to the low yield of tapping Mn alloy method

Method used

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  • A method for improving the yield rate of semi-steelmaking mn alloy
  • A method for improving the yield rate of semi-steelmaking mn alloy
  • A method for improving the yield rate of semi-steelmaking mn alloy

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Embodiment 1

[0021] The 37Mn2 steel is smelted by using molten iron after desulfurization and vanadium extraction as a raw material, and the Mn requirement of the finished steel type is 1.3-1.55% by weight.

[0022] In the present embodiment, the active lime is the active lime containing 90% by weight of CaO; the high magnesium lime is the high magnesium lime containing 30% by weight of MgO and 55% by weight of CaO; Ferrosilicon of Si and 25% by weight of Fe; the medium-carbon ferromanganese alloy is a medium-carbon ferromanganese alloy containing 80% by weight of Mn and 1.2% by weight of C.

[0023] The nominal capacity of the steelmaking converter is 120t. The composition and temperature of molten iron and steel entering the furnace are shown in Table 1.

[0024] Table 1

[0025]

[0026] After blending semi-steel into the converter, add 5kg / ton of ferrosilicon steel, then add active lime, high magnesium lime in turn, and then blow oxygen with oxygen lance to carry out converter sme...

Embodiment 2

[0029] The 37Mn2 steel is smelted by using molten iron after desulfurization and vanadium extraction as a raw material, and the Mn requirement of the finished steel type is 1.3-1.55% by weight.

[0030] In the present embodiment, the active lime is the active lime containing 85% by weight of CaO; the high magnesium lime is the high magnesium lime containing 40% by weight of MgO and 48% by weight of CaO; Ferrosilicon of Si and 25% by weight of Fe; the medium-carbon ferromanganese alloy is a medium-carbon ferromanganese alloy containing 80% by weight of Mn and 1.2% by weight of C.

[0031] The nominal capacity of the steelmaking converter is 120t. The composition and temperature of molten steel in the furnace are shown in Table 2.

[0032] Table 2

[0033]

[0034]Add semi-steel into the converter and add 4kg / ton of steel ferrosilicon, then add active lime, high magnesium lime and then oxygen lance blowing oxygen to carry out converter smelting, wherein, the amount of activ...

Embodiment 3

[0037] The 37Mn2 steel is smelted by using molten iron after desulfurization and vanadium extraction as a raw material, and the Mn requirement of the finished steel type is 1.3-1.55% by weight.

[0038] In the present embodiment, the active lime is the active lime containing 87% by weight of CaO; the high magnesium lime is the high magnesium lime containing 35% by weight of MgO and 50% by weight of CaO; Ferrosilicon of Si and 25% by weight of Fe; the medium-carbon ferromanganese alloy is a medium-carbon ferromanganese alloy containing 80% by weight of Mn and 1.2% by weight of C.

[0039] The nominal capacity of the steelmaking converter is 120t. The composition and temperature of molten iron and steel entering the furnace are shown in Table 3.

[0040] table 3

[0041]

[0042] Add semi-steel into the converter and add 6kg / ton of steel ferrosilicon, then add active lime, high magnesium lime in turn, and then oxygen lance blowing oxygen to carry out converter smelting. Amo...

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Abstract

The invention discloses a method for improving the yield rate of semi-steel-making Mn alloys. The method comprises adding semi-steel into the converter, adding slag-forming materials for converter smelting, and then controlling the end point of converter smelting and tapping the steel. During the tapping process, a medium-carbon ferromanganese alloy is added to increase manganese on the semi-steel, wherein the slag-forming materials include ferrosilicon, active lime and high-magnesium lime, and the amount of the slag-forming materials added makes the slag alkalinity 3-4, the addition of the ferrosilicon is 4-6kg / ton of steel. By adopting the method provided by the invention, it is possible to realize high-strength carbon tapping, effectively reduce the oxygen activity at the end point, and thereby effectively increase the yield of the Mn alloy.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for improving the yield of semi-steel-making Mn alloys. Background technique [0002] Due to the unique resources of vanadium-titanium magnetite in the Panxi region of my country, vanadium-titanium magnetite is used in blast furnace smelting, and vanadium-titanium ore resources are used for smelting. It is necessary to extract vanadium and desulfurize before steelmaking. After the molten iron is extracted and desulfurized The percentage of carbon mass is lower than that of ordinary molten iron (3.0%-3.8%), and the content of silicon and manganese heat-generating slag-forming elements is traces. The time is late and the heat is insufficient, which makes semi-steel steelmaking more difficult than molten iron steelmaking, and the dephosphorization rate is lower. The common method of semi-steel steelmaking is to add SiO in the steelmaking process. 2 , FeO and o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36C21C7/04C22C33/06
Inventor 陈路常军曾建华梁新腾杨森祥黄德胜杜丽华张彦恒
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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