CN102559984B - Method for producing high carbon steel through double-slag high drawing carbon tapping - Google Patents
Method for producing high carbon steel through double-slag high drawing carbon tapping Download PDFInfo
- Publication number
- CN102559984B CN102559984B CN 201210051975 CN201210051975A CN102559984B CN 102559984 B CN102559984 B CN 102559984B CN 201210051975 CN201210051975 CN 201210051975 CN 201210051975 A CN201210051975 A CN 201210051975A CN 102559984 B CN102559984 B CN 102559984B
- Authority
- CN
- China
- Prior art keywords
- converter
- steel
- molten iron
- ore
- tapping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
A method for producing high carbon steel through double-slag high drawing carbon tapping belongs to the technical field of smelting high carbon steel through a converter. The method comprises processing steps as follows: molten iron and steel scraps are loaded in the converter according to a certain molten iron ratio; in a first stage of converter steelmaking, the converting is performed at the oxygen supplying intensity of 2.8 Nm<3>/min/t, active lime and ore fluxing mediums are added in the converter, and a larger bottom blown flow rate is adopted to stir; the converting is performed at a standard lance height in the prior period for the converting of the converter, and then the lance height rises gradually; part of furnace slag is dumped through a rocking furnace; in the second stage for the converting of the converter, the converting is performed at the oxygen supplying intensity of 3.3 Nm<3>/min/t, and active lime and the ore fluxing mediums are added in the converter; the lance height rule that the converting is performed at a higher lance height in the later period and the lance height descends stage by stage is adopted; a small quantity of ores and fluorites are added frequently within 80 to 90 percent of total converting oxygen consumption; after the converting of the converter is finished, deslagging is performed through the rocking furnace of the converter, and temperature measurement and sampling are carried out; and converter tapping is carried out. The method has the advantage of overcoming the shortages of serious rephosphoration caused during the tapping process, low production efficiency, and so on.
Description
Technical field
The invention belongs to converter smelting high carbon steel technical field, particularly relate to the method that high carbon steel is produced in the high catch carbon tapping of a kind of double slag process.
Background technology
Converter smelting high carbon steel has dual mode according to the difference of when tapping carbon content of molten steel: a kind of is high catch carbon method, and a kind of is low catch carbon method.High catch carbon method tapping duration of blast is short, and the oxygen depletion amount is few, and the damage of blowing of iron is lacked the recovery rate of iron height; Tapping carbon content height, the slag all iron content is low, can alleviate slag lining erosion is improved furnace life; Carbon content height during tapping, the molten steel oxygen activity is low, can improve yield of alloy; The tapping of high catch carbon can reduce the consumption of carburelant, has both saved cost, has reduced in the carburelant nitrogen impurity again to the influence of steel cleanliness factor.But tap under the high catch carbon condition, the liquid steel dephosphorization problem is the technological difficulties that will solve.
Japan just proposes producing high carbon steel by high-catching carbon method as far back as nineteen seventies.The cord steel (Ironmaking and Steelmaking, 1977, No.1 p29～38) that Kobe iron processed adopts " height draws the method for re-blowing " to produce high-carbon is bessemerized oxygen supply intensity at 1.1～2.5Nm
3Between/the min/t, " the soft blow method " of this low oxygen supply intensity is beneficial to dephosphorization, realized tapping 0.67～0.68%C, 0.012～0.013%P, the time of bessemerizing, this method duration of blast was longer at 17.5～19 minutes, production efficiency is low, the efficient converter production of incompatible modernization.
Domestic steel mill adopts the high catch carbon tapping of double slag process to produce high carbon steel 82B (Liu Yue, Liu Liu, Tong Puqiao, Deng. the high catch carbon dephosphorizing process control in early stage of high-quality high carbon steel [J]. steel-making, 2006,22 (2): 27～29), early stage, duration of blast was greater than 8 minutes, had influenced rhythm of production; The siliceous amount mark of molten iron will be had relatively high expectations to blast-melted below 0.55%.Test is for the not research of important parameters such as the control of rifle position and oxygen supply intensity in the whole smelting process and later stage technology controlling and process measure.
The method of a kind of producing high carbon steel by high-catching carbon method of Chinese patent literature (CN101333578A), converter is with 3.1～3.4Nm
3The blowing of/min/t oxygen supply intensity, adopt the oxygen supply system of constant current amount, change rifle position, be slag former with quickened lime and ore, the higher rifle of blowing whole process using position, open to blow to and finish to adopt the rifle position system of falling rifle piecemeal, the converter smelting endpoint deslagging of falling the stove, sampling detects composition, temperature, the tapping carbon content can reach 0.46～0.65%, phosphorus content 0.013～0.014%.The constant oxygen supply intensity of this method blowing whole process using, do not consider that the soft blow operation is to the favourable condition of low temperature dephosphorization in early stage, do not have big flow bottom blowing and stir, after the blowing deslagging of falling the stove in latter stage, still have a large amount of rich phosphorus slags to stay in the stove, so tapping process can produce serious rephosphorization.
Summary of the invention
The method that the object of the present invention is to provide the tapping of the high catch carbon of a kind of double slag process to produce high carbon steel has overcome above-mentioned tapping process and has produced deficiencies such as serious rephosphorization, production efficiency be low.The present invention adopts double slag process smelting in early stage, regulates oxygen supply intensity, is the high catch carbon tapping of converter smelting high carbon steel of slag making material with lime and ore.
The present invention is container with the converter, is guaranteeing that smelting endpoint tapping temperature, molten steel phosphorus content all reach the high carbon steel smelting requirements under the carbon content higher level.High carbon steel that the present invention produces is carbon content 0.60～1.20% by weight percentage, phosphorus content≤0.018%, and all the other compositions add according to the steel grade needs.
The technical parameter of processing step of the present invention and control is as follows:
(1) according to the tapping temperature requirement, according to certain hot metal ratio (weight of molten iron be total Intake Quantity 85%～90%) pack in the converter molten iron and steel scrap;
(2) (0～6min) with 2.8Nm the converter smelting fs
3The oxygen supply intensity blowing of/min/t adds quickened lime, ore slag former in converter, adopt big bottom blowing flow to stir; Bottom blown gas adopts nitrogen, and the bottom blowing flow is 0.1Nm
3/ min/t;
(3) converter oxygen gun adopts the bit manipulation of constant current quantitative change rifle, and according to the standard rifle position system of bessemerizing, converter standard rifle position is opened and blown, and improves the rifle position behind the 2min gradually;
(4) grate is outwelled the part slag, and the deslagging amount is no less than the 40%-60% of slag gross weight;
(5) bessemerize subordinate phase with 3.3Nm
3The oxygen supply intensity blowing of/min/t adds quickened lime, ore slag former in converter, adopt less bottom blowing flow; Bottom blown gas adopts argon gas, and the bottom blowing flow is 0.05Nm
3/ min/t;
(6) later stage adopts higher rifle position to open to blow, fall the rifle position system of rifle piecemeal;
(7) total blowing oxygen consumption 80%～90% in, many batches of a small amount of ore and fluorites of adding; The ore add-on is at 2.5～5 kilograms of/ton steel, and the fluorite consumption is at 1～2.5 kilogram of/ton steel;
(8) bessemerize end, the deslagging of converter grate, thermometric, sampling;
(9) converter tapping, converter terminal control carbon content is 0.4～0.85%, phosphorus content≤0.015%.
Go into converter molten iron requirement phosphorus content≤0.12%, molten iron silicon content≤0.60%, molten iron temperature≤1380 ℃.Adopting quickened lime and ore is main slag making mode.
It is main slag making mode that quickened lime and ore are adopted in converter, and active ash requires effective CaO content 〉=85%.
In step (2), lime and ore join in the converter bessemerizing in 2 minutes, and head batch lime adds 10～30 kilograms of/ton steel according to molten iron silicon content, adds 3～10 kilograms of/ton steel of ore according to the molten iron temperature situation;
The smelting process bottom blown gas adopts nitrogen, and the bottom blowing flow is 0.1Nm
3/ min/t.
In step (3), converter oxygen gun adopts the bit manipulation of constant current quantitative change rifle, according to the standard rifle position system of bessemerizing, converter standard rifle position is opened and is blown, improve the rifle position behind the 2min, process rifle position is higher 0.2～0.4 meter than normal, adopts the rifle position system that rises rifle piecemeal, and early stage, the rifle position was higher 0.2～0.4 meter than normal blowing during finishing blowing.
In step (5), the smelting process bottom blown gas adopts argon gas, and the bottom blowing flow is 0.05Nm
3/ min/t; According to molten iron silicon content and smelt the deslagging amount early stage and add 15～30 kilograms of/ton steel of lime, add 7～20 kilograms of/ton steel of ore according to the molten iron temperature situation.
In step (6), converter oxygen gun adopts the bit manipulation of constant current quantitative change rifle, and according to the standard rifle position system of bessemerizing, converter is opened and blown the rifle position and process rifle position is higher 0.2～0.4 meter than normal, adopt the rifle position system of falling rifle piecemeal, it is higher 0.2 meter than normal blowing to carry rifle rifle position during finishing blowing.
In step (7), the ore add-on is at 2.5～5 kilograms of/ton steel, and the fluorite consumption is at 1～2.5 kilogram of/ton steel.
The invention has the advantages that: the big oxygen flow of the oxygen rifle soft blow technology of fs and subordinate phase combines, and has not only improved dephosphorization rate but also improved smelting efficient; Adopt early stage the soft blow operation can make slag active, improve the slag dephosphorizing capacity; Adopt bigger bottom blowing flow that slag is fully contacted, for dephosphorization provides good dynamic conditions; The smelting process deslagging can reduce the rich phosphorus slag quantity of slag, has reduced later stage rephosphorization amount; Later stage is reduced the bottom blowing flow, has effectively avoided the erosion of high-temperature molten steel to furnace bottom, can improve furnace life; Present method dephosphorization effect is stable, and molten steel is to the requirement of phosphorus content in the time of can satisfying high catch carbon tapping.
Embodiment
For smelting main points of the present invention and implementation result thereof clearly are described, provide embodiment and the implementation result of 210 tons of converter smeltings.
Embodiment 1:
The method that high carbon steel is produced in high catch carbon tapping according to double slag process of the present invention adds 185 tons of molten iron in 210 tons of converters, 23.5 tons of steel scraps, and the molten iron condition is: 4.13%C, 0.37%Si, 0.23%Mn, 0.10%P, 0.038%S, 1357 ℃; Fs is adopted 2.8Nm
3The oxygen supply intensity blowing of/min/t is opened and is blown 2.5 meters of rifle positions, 2.7～2.1 meters of process rifle positions, 1.9 meters of catch carbon rifle positions, open and blow the back and in 1 minute, add 5 tons of lime (25 kilograms of/ton steel) in the converter, 1.5 tons of ores (7 kilograms of/ton steel), the bottom blowing nitrogen flow is for being 0.1Nm
3/ min/t, the fs finishes hot metal composition and temperature is: 3.53%C, 0.002%Si, 0.09%Mn, 0.021%P, 0.041%S, 1387 ℃; Subordinate phase adopts 3.3Nm
3The blowing of the oxygen supply intensity of/min/t is opened and is blown 2.3 meters of rifle positions, 2.6～2.1 meters of process rifle positions, and 1.9 meters of blow off rifle positions are opened and are blown the back add 6 tons of lime (28 kilograms of/ton steel) in converter, 3.1 tons of ores (15 kilograms of/ton steel), the bottom blowing nitrogen flow is for being 0.05Nm
3/ min/t adds totally 700 kilograms and 200 kilograms in ore and fluorite in two batches in 80～90% of blowing oxygen consumption; Total duration of blast 14 minutes, finishing blowing, deslagging, thermometric, sampling; Tapping.By above-mentioned smelting process, realized tapping C=0.55%, P=0.008%, tapping temperature=1595 ℃.
Embodiment 2:
The method that high carbon steel is produced in high catch carbon tapping according to double slag process of the present invention adds 183 tons of molten iron in 210 tons of converters, 25 tons of steel scraps, and the molten iron condition is: 4.03%C, 0.58%Si, 0.21%Mn, 0.097%P, 0.034%S, 1377 ℃; Fs is adopted 2.8Nm
3The oxygen supply intensity blowing of/min/t is opened and is blown 2.4 meters of rifle positions, 2.6～2.1 meters of process rifle positions, 1.8 meters of catch carbon rifle positions, open and blow the back and in 1 minute, add 4.5 tons of lime (23 kilograms of/ton steel) in the converter, 1.5 tons of ores (7 kilograms of/ton steel), the bottom blowing nitrogen flow is for being 0.1Nm
3/ min/t, the fs finishes hot metal composition and temperature is: 3.68%C, 0.002%Si, 0.08%Mn, 0.023%P, 0.035%S, 1369 ℃; Subordinate phase adopts 3.3Nm
3The blowing of the oxygen supply intensity of/min/t is opened and is blown 2.3 meters of rifle positions, 2.7～2.0 meters of process rifle positions, and 1.9 meters of blow off rifle positions are opened and are blown the back add 5 tons of lime (24 kilograms of/ton steel) in converter, 3.4 tons of ores (16 kilograms of/ton steel), the bottom blowing nitrogen flow is for being 0.05Nm
3/ min/t adds totally 550 kilograms and 200 kilograms in ore and fluorite in two batches in 80～90% of blowing oxygen consumption; Total duration of blast 14.4 minutes, finishing blowing, deslagging, thermometric, sampling; Tapping.By above-mentioned smelting process, realized tapping C=0.62%, P=0.012%, tapping temperature=1599 ℃.
By above embodiment as can be seen, the method that adopts the high catch carbon tapping of double slag process of the present invention to produce high carbon steel can satisfy the dephosphorization effect under the high catch carbon condition of molten steel, realizes high catch carbon tapping.
Claims (3)
1. the high catch carbon of double slag process is tapped and is produced the method for high carbon steel, and carbon content is 0.60～1.20% in the high carbon steel, and phosphorus content≤0.018% is characterized in that, the technical parameter of processing step and control is as follows:
(1) according to the tapping temperature requirement, be pack in the converter molten iron and steel scrap of 85% ~ 90% of total Intake Quantity according to weight of molten iron, go into converter molten iron requirement phosphorus content≤0.12%, molten iron silicon content≤0.60%, molten iron temperature≤1380 ℃;
(2) converter smelting fs 0 ~ 6min is with 2.8Nm
3The oxygen supply intensity blowing of/min/t, in converter, add quickened lime, ore slag former, add 10～30 kilograms of/ton steel of lime according to molten iron silicon content, add 3～10 kilograms of/ton steel of ore according to the molten iron temperature situation, bottom blown gas adopts nitrogen, and the bottom blowing flow is 0.1Nm
3/ min/t;
(3) converter oxygen gun adopts the bit manipulation of constant current quantitative change rifle, and according to the standard rifle position system of bessemerizing, converter standard rifle position is opened and blown, and improves the rifle position behind the 2min gradually;
(4) grate is outwelled the part slag, and the deslagging amount is the 40%-60% of slag gross weight;
(5) bessemerize subordinate phase with 3.3Nm
3The oxygen supply intensity blowing of/min/t, in converter, add quickened lime, ore slag former, according to molten iron silicon content and smelt the deslagging amount early stage and add 15～30 kilograms of/ton steel of lime, add 7～20 kilograms of/ton steel of ore according to the molten iron temperature situation, bottom blown gas adopts argon gas, and the bottom blowing flow is 0.05Nm
3/ min/t;
(6) later stage adopts higher rifle position to open to blow, fall the rifle position system of rifle piecemeal;
(7) total blowing oxygen consumption 80% ~ 90% in, many batches of a small amount of ore and fluorites of adding; The ore add-on is at 2.5 ~ 5 kilograms of/ton steel, and the fluorite consumption is at 1 ~ 2.5 kilogram of/ton steel;
(8) bessemerize end, the deslagging of converter grate, thermometric, sampling;
(9) converter tapping, converter terminal control carbon content is 0.4～0.85%, phosphorus content≤0.015%.
2. the high catch carbon of a kind of double slag process according to claim 1 is tapped and produced the method for high carbon steel, it is characterized in that: it is main slag making mode that quickened lime and ore are adopted in converter, and active ash requires effective CaO content 〉=85%.
3. the high catch carbon of a kind of double slag process according to claim 1 tapping method of producing high carbon steel is characterized in that: in step (2), lime and ore join in the converter bessemerizing in 2 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210051975 CN102559984B (en) | 2012-03-01 | 2012-03-01 | Method for producing high carbon steel through double-slag high drawing carbon tapping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210051975 CN102559984B (en) | 2012-03-01 | 2012-03-01 | Method for producing high carbon steel through double-slag high drawing carbon tapping |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102559984A CN102559984A (en) | 2012-07-11 |
| CN102559984B true CN102559984B (en) | 2013-08-14 |
Family
ID=46406583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210051975 Active CN102559984B (en) | 2012-03-01 | 2012-03-01 | Method for producing high carbon steel through double-slag high drawing carbon tapping |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102559984B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103540707B (en) * | 2013-11-11 | 2015-11-11 | 莱芜钢铁集团有限公司 | Entirely stay slag-single slag process converter smelting method |
| CN103642973A (en) * | 2013-12-17 | 2014-03-19 | 河北钢铁股份有限公司唐山分公司 | Method for reducing content of iron shots in poured slag of SGRS (slag generation reduced steelmaking) process |
| CN104561433B (en) * | 2014-12-24 | 2016-08-24 | 山东钢铁股份有限公司 | A kind of converter smelting method of medium high carbon ultra-low phosphoretic steel water |
| CN109628697B (en) * | 2018-12-19 | 2020-07-24 | 钢铁研究总院 | High-carbon dephosphorization method for smelting medium-high carbon steel grade in converter |
| CN112708716B (en) * | 2020-12-08 | 2023-07-07 | 首钢集团有限公司 | Production method for rapidly heating large scrap steel ratio of molten iron-containing converter |
| CN112708719B (en) * | 2020-12-15 | 2022-03-15 | 安徽长江钢铁股份有限公司 | Converter steelmaking method by replacing full amount of scrap steel with iron slag |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101333578A (en) * | 2007-06-29 | 2008-12-31 | 首钢总公司 | Method for producing high carbon steel by high-catching carbon method |
-
2012
- 2012-03-01 CN CN 201210051975 patent/CN102559984B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101333578A (en) * | 2007-06-29 | 2008-12-31 | 首钢总公司 | Method for producing high carbon steel by high-catching carbon method |
Non-Patent Citations (4)
| Title |
|---|
| 姚志超 等.高拉碳法冶炼82B系列钢的生产实践.《炼钢》.2010,第26卷(第3期),34-36,46. |
| 田志红 等.非脱磷铁水在210t转炉高拉碳法冶炼高碳钢的生产工艺研究及实践.《钢铁》.2009,第44卷(第2期),36-39. |
| 非脱磷铁水在210t转炉高拉碳法冶炼高碳钢的生产工艺研究及实践;田志红 等;《钢铁》;20090228;第44卷(第2期);36-39 * |
| 高拉碳法冶炼82B系列钢的生产实践;姚志超 等;《炼钢》;20100630;第26卷(第3期);34-36,46 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102559984A (en) | 2012-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101333578B (en) | Method for producing high carbon steel by high-catching carbon method | |
| CN102559984B (en) | Method for producing high carbon steel through double-slag high drawing carbon tapping | |
| CN104911295B (en) | The smelting process that a kind of converter less-slag material is added | |
| CN102212643B (en) | Converter less-slag smelting process | |
| CN110129517B (en) | Method for smelting high-silicon iron water based on converter duplex method to improve dephosphorization rate of desiliconization furnace | |
| CN102559985B (en) | Method of smelting low-phosphorus steel through converter | |
| CN102943145B (en) | Converter smelting method of ultra-low phosphorus steel | |
| CN103352101B (en) | Low-cost smelting technology of converter | |
| CN103266196B (en) | Method for producing carbon steel by using low-temperature low-silicon molten iron in 90-ton converter | |
| CN102168160B (en) | Converter steelmaking technology for directly reducing-alloying manganese ore | |
| CN112708716B (en) | Production method for rapidly heating large scrap steel ratio of molten iron-containing converter | |
| CN103642971B (en) | Improve method and the Semi-steel making method of semi-steel making endpoint carbon content | |
| CN105861775A (en) | Smelting process for ultra-low phosphorus steel with high nickel content | |
| CN108103261A (en) | A kind of mini-mill steelmaking method based on converter | |
| CN103571999A (en) | Method for smelting nitrogen-controlling martensite stainless steel through total molten iron | |
| CN102534093A (en) | Control method of two-stage auxiliary material module in revolving furnace smelting process | |
| CN103642966B (en) | Method for improving high-carbon high-manganese steel converter smelting endpoint carbon content and steelmaking method | |
| CN109628697B (en) | High-carbon dephosphorization method for smelting medium-high carbon steel grade in converter | |
| CN105463149A (en) | Process for deoxidation smelting of aluminum-bearing steel by means of silicon carbide | |
| CN103627851B (en) | Semisteel steelmaking temperature control method and semisteel steelmaking method | |
| CN103215408B (en) | A kind ofly add the method that slag block carries out converter steelmaking | |
| CN102251072B (en) | Dephosphorizing process of electric furnace steel making | |
| CN101864508B (en) | Steel making method of convertor with small slag quantity | |
| CN109280734B (en) | Smelting method of medium and high alloy ultra-low phosphorus steel | |
| CN101440419B (en) | Control method for smelting high carbon low phosphorus steel by converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
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 |
|
| CP01 | Change in the name or title of a patent holder |