CN102212651B - Steel ladle powder injection desulfuration refining process for low-sulfur steel production - Google Patents
Steel ladle powder injection desulfuration refining process for low-sulfur steel production Download PDFInfo
- Publication number
- CN102212651B CN102212651B CN 201110147607 CN201110147607A CN102212651B CN 102212651 B CN102212651 B CN 102212651B CN 201110147607 CN201110147607 CN 201110147607 CN 201110147607 A CN201110147607 A CN 201110147607A CN 102212651 B CN102212651 B CN 102212651B
- Authority
- CN
- China
- Prior art keywords
- steel
- desulfuration
- powder injection
- sulfur
- spraying powder
- 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
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a steel ladle powder injection desulfuration refining process for low-sulfur steel production. The process is characterized in that: 3.0 to 6.5kg/t of aluminum iron for strong deoxidation is adopted in converter tapping; 0.4 to 0.6kg/t of aluminum for slag surface deoxidation is added on the steel ladle slag surface after tapping is finished; the oxidation property (FeO%+Mn%) of station reaching top slag of steel ladles is less than or equal to 3.5 percent; the temperature of the molten steel reaching a powder injection desulfuration station is 1,610 to 1,640 DEG C, and Alt in the steel is 0.040 to 0.090 percent; the working pressure of steel ladle powder injection desulfuration delivery carrier gas is 3.0 to 4.0bar, and the flow is 40 to 60m<3>/h; and the powder injection velocity of steel ladle powder injection desulfuration is 40 to 60kg/min, and the consumption of the injection powder is 4.0 to 6.0 kg/t of steel. After the steel ladle powder injection desulfuration process is adopted, the sulfur content of the steel can be reduced from 50-80ppm to within 12ppm, and the desulfuration rate can reach 78.0 to 85.0 percent.
Description
Technical field
The invention belongs to steelmaking technical field, particularly relate to a kind of steel spraying powder desulfurizing and refining technique for low-sulfur steel production, adopt the steel spraying powder sweetener to carry out dark desulfurization during smelting low-sulfur steel and process, thereby realize the control of sulphur content in the low-sulfur steel.
Background technology
Except special steel grade, sulphur is harmful element in steel, and it is hot-short that steel is produced, and can also have a negative impact by the mechanical property of formation sulfide inclusion to steel; When sulphur content was higher in the steel, the surface of steel is corrosion and reduce the resistance to corrosion of steel easily, also can reduce simultaneously the impelling strength of steel.Increasing along with high-level steel grade demand, specification of quality to steel is more and more stricter, in smelting process, require the sulphur content in the steel to reduce as far as possible, especially the steel grade of the antiacid class special purpose such as pipeline, container requires sulphur content less than 0.0015%, therefore, success carries out the key that dark desulfurization is the high-level steel grade of smelting to molten steel.
In the smelting iron and steel technical field, the producer of domestic and international application steel spraying powder sulfur removal technology is relatively less at present, and major cause is that technique is unstable, and sweetening effectiveness is not good enough, plant factor is not high, so this patent has proposed a kind of steel spraying powder desulfurizing and refining technique for low-sulfur steel production.
The present situation of present technique: for the high-quality steel grade of sulphur content requirement≤0.0020%, generally adopt the techniques such as the refining of LF stove or VD refining to carry out the dark desulfurization of molten steel and process, do not retrieve and adopt steel spraying powder sulfur removal technology technology to carry out the Patents that low-sulfur steel is smelted.
Summary of the invention
The purpose of this invention is to provide a kind of steel spraying powder desulfurizing and refining technique for low-sulfur steel production, by to the oxygen level in the steel, the blowing powder composition, injecting velocity, the factors such as the amount of dusting are carried out system's control, formed and adopted the steel spraying powder sweetener to produce the smelting control technique of low-sulfur steel, guaranteed the effect of liquid steel desulphurization, sulphur content in the steel is removed in the 12ppm by 50ppm-80ppm, the desulfurization degree of powder injection process can reach 78.0%-85.0%, realized that employing steel spraying powder sulfur removal technology produces low-sulfur steel, for the production of low-sulfur steel provides a new production technology.
The technical solution adopted in the present invention is:
(1) converter tapping adopts the strong deoxidation of ferro-aluminum, and the ferro-aluminum add-on is the 3.0-6.5kg/t steel;
(2) tapping finishes to add aluminium to the ladle top of the slag and carries out top of the slag deoxidation, and add-on is the 0.4-0.6kg/t steel;
(3) ladle arrives at a station and requires the top slag oxidizing: (FeO%+MnO%)≤3.5%;
(4) molten steel requires to the powder injection desulphurization station: temperature is at 1610-1640 ℃, Alt%:0.040%-0.090%;
(5) steel spraying powder desulfurization delivery of carrier gas requires: operating pressure 3.0-4.0bar, flow 40-60m
3/ h;
(6) steel spraying powder desulfurization dusting speed requires: 40-60kg/min;
(7) steel spraying powder desulfuration injection pulvis consumption: 4.0-6.0kg/t steel.
Ladle desulfurization pulvis composition of the present invention consists of (by weight percentage): CaO:75%-80%, SiO
2: 0%-4%, MgO:0%-5%, CaF
2: 5%-10%, all the other are impurity.
Advantage of the present invention: after adopting this steel spraying powder sulfur removal technology, sulphur content in the steel can be removed in the 12ppm by 50ppm-80ppm, the desulfurization degree of steel spraying powder can reach 78.0%-85.0%, realized that employing steel spraying powder sweetener carries out low-sulfur steel production, and the method is simple to operate, satisfies the batch production demand.
Embodiment
Embodiment 1:
Steel grade X80 adopts technique of the present invention to carry out steel spraying powder desulfurization low-sulfur steel and smelts, 100 tons of converter tapping quantities, and the strong deoxidation of ferro-aluminum is adopted in tapping, and the ferro-aluminum add-on is the 5.0kg/t steel; Tapping finishes to add aluminum shot to the ladle top of the slag and carries out top of the slag deoxidation, and add-on is the 0.5kg/t steel; Ladle is to powder injection desulphurization station top slag oxidizing FeO%+MnO%=3.5%; The temperature of arriving at a station is at 1630 ℃, and Alt content mass percent is 0.070% in the steel; Steel spraying powder desulfurization delivery of carrier gas operating pressure is 3.5bar, and carrier gas flux is 45m
3/ h; Steel spraying powder desulfuration injection speed 50kg/min, blowing powder consumption 5.5kg/t steel.Sulphur content in the steel is removed to 10ppm by 54ppm, and the desulfurization degree of powder injection process is 81.48%.
Embodiment 2:
Steel grade X70 adopts technique of the present invention to carry out steel spraying powder desulfurization low-sulfur steel and smelts, 100 tons of converter tapping quantities, and the strong deoxidation of ferro-aluminum is adopted in tapping, and the ferro-aluminum add-on is the 4.0kg/t steel; Tapping finishes to add aluminum shot to the ladle top of the slag and carries out top of the slag deoxidation, and add-on is the 0.45kg/t steel; Ladle is to powder injection desulphurization station top slag oxidizing FeO%+MnO%=3.0%; The temperature of arriving at a station is at 1620 ℃, and Alt content mass percent is 0.065% in the steel; Steel spraying powder desulfurization delivery of carrier gas operating pressure is 4.0bar, and carrier gas flux is 55m
3/ h; Steel spraying powder desulfuration injection speed 50kg/min, blowing powder consumption 6.0kg/t steel.Sulphur content in the steel is removed to 12ppm by 80ppm, and the desulfurization degree of powder injection process is 85.0%.
Claims (1)
1. one kind is used for the steel spraying powder desulfurizing and refining technique that low-sulfur steel is produced, and the ladle desulfurization pulvis composition that this technique is used consists of by weight percentage: CaO:75%-80%, SiO
2: 0%-4%, MgO:0%-5%, CaF
2: 5%-10%, all the other are impurity; It is characterized in that: converter tapping adopts the strong deoxidation of ferro-aluminum, and the ferro-aluminum add-on is the 3.0-6.5kg/t steel; Tapping finishes to add aluminium to the ladle top of the slag and carries out top of the slag deoxidation, and add-on is the 0.4-0.6kg/t steel; The ladle top slag oxidizing of arriving at a station: (FeO%+MnO%)≤3.5%; Molten steel requires to the powder injection desulphurization station: temperature is at 1610-1640 ℃, Alt%:0.040%-0.090%; Steel spraying powder desulfurization delivery of carrier gas requires: operating pressure 3.0-4.0bar, flow 40-60m
3/ h; Steel spraying powder desulfurization dusting speed requires: 40-60kg/min; Steel spraying powder desulfuration injection pulvis consumption: 4.0-6.0kg/t steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110147607 CN102212651B (en) | 2011-06-02 | 2011-06-02 | Steel ladle powder injection desulfuration refining process for low-sulfur steel production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110147607 CN102212651B (en) | 2011-06-02 | 2011-06-02 | Steel ladle powder injection desulfuration refining process for low-sulfur steel production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102212651A CN102212651A (en) | 2011-10-12 |
| CN102212651B true CN102212651B (en) | 2013-04-17 |
Family
ID=44744182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110147607 Active CN102212651B (en) | 2011-06-02 | 2011-06-02 | Steel ladle powder injection desulfuration refining process for low-sulfur steel production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102212651B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102559998A (en) * | 2012-02-03 | 2012-07-11 | 北京首钢国际工程技术有限公司 | Technology for online dusting desulfuration of steel ladles |
| CN102534120A (en) * | 2012-02-29 | 2012-07-04 | 首钢总公司 | Smelting process for production of super-low sulphur steel |
| CN105506224A (en) * | 2015-12-26 | 2016-04-20 | 首钢总公司 | Ladle furnace desulfuration refining technology adopting low-alkalinity refining slag |
| CN108300837A (en) * | 2018-02-27 | 2018-07-20 | 首钢京唐钢铁联合有限责任公司 | A kind of method for making steel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010935A (en) * | 2010-12-13 | 2011-04-13 | 首钢总公司 | Desulphurization powder used in steel ladle powder injection refining process and production method thereof |
-
2011
- 2011-06-02 CN CN 201110147607 patent/CN102212651B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010935A (en) * | 2010-12-13 | 2011-04-13 | 首钢总公司 | Desulphurization powder used in steel ladle powder injection refining process and production method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 刘金刚等.管线钢X70冶炼硫含量控制.《北京金属学会第五届冶金年会论文集》.2009,461-463. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102212651A (en) | 2011-10-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102534120A (en) | Smelting process for production of super-low sulphur steel | |
| CN101798612B (en) | Process for washing, pre-desulfurizing and refining tapping steel slag of converter | |
| CN104004881B (en) | A kind of control method of producing nitrogen content in aluminium deoxidation high carbon steel process | |
| CN101215618A (en) | Method for smelting ultra-low-carbon steel | |
| CN105018855B (en) | Method for producing circular sulfur-resistant pipeline steel billet for oil and gas collection and transmission | |
| CN101550475A (en) | Method for producing ultra-low-carbon steel | |
| CN102168160B (en) | Converter steelmaking technology for directly reducing-alloying manganese ore | |
| CN101760585A (en) | Deep-desulphurizing slag system containing BaO and Li2O and method for producing ultralow-sulfur steel by adopting same | |
| CN101323896A (en) | Refined-smelting ladle furnace carbon control deep desulphurization method for ultra-low-carbon steel production | |
| CN101550513A (en) | A method for fast and deep desulfurization of low-carbon aluminum-killed steel | |
| CN102212651B (en) | Steel ladle powder injection desulfuration refining process for low-sulfur steel production | |
| CN103882183A (en) | Desulfurization refining slag for steelmaking process and addition method thereof | |
| CN102268513A (en) | Method for improving castability of molten steel of medium and low carbon steel | |
| CN109097522B (en) | Converter smelting method for molten steel residual manganese at medium-high manganese, high phosphorus and low silicon iron water extraction and improvement end point | |
| CN104195290A (en) | Molten steel dephosphorization agent and molten steel dephosphorization refining method | |
| CN104561445A (en) | Modifying treatment method of blowing desulfurization slag | |
| CN103555886B (en) | Method for smelting ultralow-sulfur steel by using vanadium-containing molten iron | |
| CN103643117B (en) | A kind of ultralow aluminum steel and smelting process thereof | |
| CN102719614B (en) | Process for producing anti-acid pipeline steel by Ruhrstahl Heraecus (RH)-ladle furnace (LF)-RH refining | |
| CN102719728B (en) | Technique for producing anti-acid pipeline steel by RH-LF-VD refining | |
| CN103540711A (en) | Method for simultaneously removing sulfur and phosphorus from semi-steel | |
| CN102899440A (en) | Method of silicon removal pretreatment of molten iron | |
| CN102962411B (en) | Production method of low-carbon and medium-carbon steel | |
| CN109161635B (en) | Preparation method for extracting carbon and protecting manganese by converter smelting high-manganese high-sulfur high-phosphorus iron water | |
| CN104232845A (en) | Argon oxygen decarburization (AOD) slag-making method during smelting of sulfur-containing free-cutting stainless steel |
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 |