CN101413044B - Alloy addition method for improving yield of ferromolybdenum - Google Patents

Alloy addition method for improving yield of ferromolybdenum Download PDF

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Publication number
CN101413044B
CN101413044B CN2008102278143A CN200810227814A CN101413044B CN 101413044 B CN101413044 B CN 101413044B CN 2008102278143 A CN2008102278143 A CN 2008102278143A CN 200810227814 A CN200810227814 A CN 200810227814A CN 101413044 B CN101413044 B CN 101413044B
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China
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tapping
steel
slag
ferromolybdenum
molybdenum
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CN101413044A (en
Inventor
李战军
王文军
朱志远
刘金刚
石树东
郝宁
史志强
吕延春
姜中行
麻庆申
石磊
王东柱
刘成
沈峰
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Shougang Group Co Ltd
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Shougang Corp
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Abstract

The invention provides an alloy adding method for increasing ferromolybdenum yield, and belongs to the steelmaking technical field. The method is as follows: the mode for adding the ferromolybdenum is changed from loading by a converter to adding from an overhead bunker in the tapping process; the grain size of the ferromolybdenum is controlled to be between 15 and 30mm lumpish ferromolybdenum asrequired; the working state of air bricks on the bottom part of steel ladle is ensured to be good; the tapping temperature is controlled to be between 1680 and 1710 DEG C; during tapping, the bottom-blow argon flow rate of the steel ladle is controlled to be between 6 and 7NL/(min.t), and the liquid steel surface is ensured to be opened; when half of steel tapping amount is reached, the alloy andthe ferromolybdenum are added, and the adding sequence is AlFe-MnFe-MoFe; the amount of roughing slag of the converter is controlled, and the slag thickness is between 30 and 60mm; and after tapping,the slag surface of the steel ladle is added with 40kg of aluminum grains. The method has the advantages of effectively solving the problem that the Mo yield is lower during Mo containing steel melting, improving the Mo yield from 85 percent before to nearly 95 percent, realizing the stable, highly efficient and mass production and lowering melting cost.

Description

A kind of alloy addition method that is used to improve molybdenum yield
Technical field
The invention belongs to steelmaking technical field, particularly relate to a kind of alloy addition method that is used to improve molybdenum yield, especially smelt the stable control that high-level steel grade is realized Mo content.
Background technology
Molybdenum is mainly used in the additive of making steel, adds molybdenum in the steel and can make steel have uniform microlitic structure, reduces the eutectoid decomposition temperature, enlarges heat-treatment temperature range and full hardening deepness, can also improve its hardness and toughness, creep-resistant property.The additive of steel industry generally adopts molybdenum-iron, and the price of molybdenum-iron is comparatively expensive, and the price of 60Mo is 25.4 ten thousand yuan/ton, is accompanied by the significantly falling of steel market price, therefore, the recovery rate that improves Mo when smelting high-level steel grade reduces cost and seems most important.
The present situation of present Technology: in the smelting process that contains the Mo steel, molybdenum-iron follows steel scrap to join in the converter together in the steel scrap hopper, in the process of bessemerizing because the part that oxidation and slag are taken away causes the recovery rate of Mo relatively low, has only 80%-85%, increase smelting cost greatly, and do not had special method to solve the method that in smelting process, improves the Mo recovery rate.
Summary of the invention
The purpose of this invention is to provide a kind of iron and steel smelting process that molybdenum yield reduces production costs that is used to improve, the molybdenum-iron mode that adds changed in the tapping process by the converter when filling with substance add by high hopper, solved the lower problem of Mo recovery rate when containing the Mo steel of smelting, in the smelting of high-quality steel grade, how to improve Mo recovery rate, reduce cost, stabilization process control, thereby satisfy the requirement of producing.
The technical solution adopted for the present invention to solve the technical problems is:
1. molybdenum-iron adds mode: changed in the tapping process by the converter when filling with substance and being added by high hopper;
2. Kong Zhi molybdenum-iron granularity requires to adopt the block molybdenum-iron of 15mm-30mm;
3. guarantee ladle bottom gas permeable brick working order, ensure the air communication mistake;
4. tapping temperature is controlled at 1680-1710 ℃;
Control steel ladle bottom argon blowing airshed guarantees that at 6-7NL/ (mint) the molten steel face opens when 5. tapping;
6. reach at 1/2 o'clock in tap and add alloy and molybdenum-iron, addition sequence is AlFe-MnFe-MoFe;
7. control the quantity of slag under the converter, the thick 30-60mm of slag;
8. tapping finishes to add aluminum shot 0.4-0.6kg/t steel on the ladle top of the slag.
Advantage of the present invention: effectively solved the low problem of Mo recovery rate when containing the Mo steel of smelting, the recovery rate of Mo has been brought up to more than 95% from 80%-85% before; Can realize stablizing, efficiently, produce in batches, and greatly reduce smelting cost.
Embodiment
Embodiment 1: steel grade X70,100 tons of ladles, adopt technology of the present invention to improve the specific absorption of Mo: prepare molybdenum-iron at the converter high hopper, adopt little bulk, its granularity is 20mm-30mm; Check the ladle working situation before the tapping, guarantee that ladle bottom gas permeable brick working order is good; Tapping temperature is 1710 ℃; Control steel ladle bottom argon blowing flow guarantees that at 6.5NL/ (mint) the molten steel face opens during tapping; Reach at 1/2 o'clock in tap and add alloy and molybdenum-iron, addition sequence is AlFe-MnFe-MoFe; The quantity of slag under the control converter, the thick 60mm of slag, tapping finishes to add the 40kg aluminum shot toward the top of the slag.It is as shown in table 1 below that tapping finishes molten steel composition, molybdenum-iron add-on and Mo recovery rate.
Table 1
Finished product Mo% MoFe add-on/kg The recovery rate of Mo
0.13 223.88 98.05%
In the finished product in the steel Mo content be 0.13%, reach and smelt the Composition Control requirement, the content of Mo is 61% among the MoFe, calculates according to add-on, the recovery rate of Mo is 98.05%.
Embodiment 2: steel grade X70,100 tons of ladles, adopt technology of the present invention to improve the specific absorption of Mo: prepare molybdenum-iron at the converter high hopper, adopt little bulk, its granularity is 15mm-30mm; Check the ladle working situation before the tapping, guarantee that ladle bottom gas permeable brick working order is good; Tapping temperature is 1701 ℃; Control steel ladle bottom argon blowing flow guarantees that at 7NL/ (mint) the molten steel face opens during tapping; Reach at 1/2 o'clock in tap and add alloy and molybdenum-iron, addition sequence is AlFe-MnFe-MoFe; The quantity of slag under the control converter, the thick 40mm of slag, tapping finishes to add the 40kg aluminum shot toward the top of the slag.It is as shown in table 2 below that tapping finishes molten steel composition, molybdenum-iron add-on and Mo recovery rate.
Table 2
Finished product Mo% MoFe add-on/kg The recovery rate of Mo
0.16 239.1 95.44%
In the finished product in the steel Mo content be 0.16%, reach and smelt the Composition Control requirement, the content of Mo is 61% among the MoFe, calculates according to add-on, the recovery rate of Mo is 95.44%.
Embodiment 3: steel grade X80,100 tons of ladles, adopt technology of the present invention to improve the specific absorption of Mo: prepare molybdenum-iron at the converter high hopper, adopt little bulk, its granularity is 15mm-30mm; Check the ladle working situation before the tapping, guarantee that ladle bottom gas permeable brick working order is good; Tapping temperature is 1700 ℃; Control steel ladle bottom argon blowing flow guarantees that at 7NL/ (mint) the molten steel face opens during tapping; Reach at 1/2 o'clock in tap and add alloy and molybdenum-iron, addition sequence is AlFe-MnFe-MoFe; The quantity of slag under the control converter, the thick 50mm of slag, tapping finishes to add the 40kg aluminum shot toward the top of the slag.It is as shown in table 3 below that tapping finishes molten steel composition, molybdenum-iron add-on and Mo recovery rate.
Table 3
Finished product Mo% MoFe add-on/kg The specific absorption of Mo
0.23 391.5 96.31%
In the finished product in the steel Mo content be 0.23%, reach and smelt the Composition Control requirement, the content of Mo is 61% among the MoFe, calculates according to add-on, the recovery rate of Mo is 96.31%.

Claims (3)

1. alloy addition method that is used to improve molybdenum yield is characterized in that:
(1) the molybdenum-iron mode that adds is changed in the tapping process by the converter when filling with substance and being added by high hopper;
(2) Kong Zhi molybdenum-iron granularity adopts the block molybdenum-iron of 15mm-30mm;
(3) guarantee ladle bottom gas permeable brick working order, ensure the air communication mistake;
(4) tapping temperature is controlled at 1680-1710 ℃;
Control steel ladle bottom argon blowing airshed when (5) tapping guarantees that the molten steel face opens, and fully dissolves MoFe;
(6) reach at 1/2 o'clock in tap, add AlFe-MnFe-MoFe in order successively;
(7) quantity of slag under the control converter, the thick 30-60mm that requires of slag;
(8) tapping finishes to add aluminum shot 0.4-0.6kg/t steel on the ladle top of the slag.
2. method according to claim 1 is characterized in that, control steel ladle bottom argon blowing flow is at 6-7NL/ (mint) during tapping.
3. method according to claim 1 is characterized in that, reaches at 1/2 o'clock in tap and with AlFe molten steel is carried out deoxidation earlier, then, adds MnFe, MoFe in order successively, reduces the oxidation of alloy as far as possible, improves the recovery rate of Mo.
CN2008102278143A 2008-11-28 2008-11-28 Alloy addition method for improving yield of ferromolybdenum Active CN101413044B (en)

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CN101713012B (en) * 2009-12-05 2011-08-10 永兴特种不锈钢股份有限公司 Method for increasing molybdenum yield in stainless steel smelting
CN102161139A (en) * 2010-12-13 2011-08-24 首钢总公司 Production method for manufacturing steel wire rod for X80 pipe line steel submerged arc welding wire
CN106319330A (en) * 2015-06-26 2017-01-11 鞍钢股份有限公司 Ferro-tungsten alloying method for tungsten-containing steel
CN107179703B (en) * 2016-03-09 2020-06-23 宝山钢铁股份有限公司 Steelmaking alloy input control method

Citations (2)

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Publication number Priority date Publication date Assignee Title
CN1046191A (en) * 1989-04-06 1990-10-17 抚顺钢厂 The single slag process smelting high-speed tool steel improves the technology of vanadium, chromium recovery rate
CN1302914A (en) * 2000-10-18 2001-07-11 钢铁研究总院 Technology for smelting Mo-contained alloy steel with molybdenum oxide

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1046191A (en) * 1989-04-06 1990-10-17 抚顺钢厂 The single slag process smelting high-speed tool steel improves the technology of vanadium, chromium recovery rate
CN1302914A (en) * 2000-10-18 2001-07-11 钢铁研究总院 Technology for smelting Mo-contained alloy steel with molybdenum oxide

Non-Patent Citations (2)

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陈伟庆等.氧化钼用于转炉炼钢合金化.钢铁.1995,第30卷增刊26-31. *

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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing

Patentee after: Shougang Group Co. Ltd.

Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing

Patentee before: Capital Iron & Steel General Company