CN109280745A - A kind of convertor steelmaking process dephosphorization core-spun yarn - Google Patents
A kind of convertor steelmaking process dephosphorization core-spun yarn Download PDFInfo
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- CN109280745A CN109280745A CN201811297745.3A CN201811297745A CN109280745A CN 109280745 A CN109280745 A CN 109280745A CN 201811297745 A CN201811297745 A CN 201811297745A CN 109280745 A CN109280745 A CN 109280745A
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- steel
- core
- spun yarn
- aggregate
- steel strip
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
A kind of convertor steelmaking process dephosphorization core-spun yarn, belongs to Wide and Thick Slab technical field of smelting.Core-spun yarn is made of steel strip, Dephosphorising agent and aggregate, Dephosphorising agent chemical analysis are as follows: CaO:50~70wt%, SiO2: 5~10wt%, Fe2O3: 8~15wt%, CaCO3: 8~15wt%, Na2CO3: 6~12wt%, surplus are a small amount of inevitable impurity element, and aggregate is fluorite；When molten steel is through converter smelting, after carbon content reaches steel grade requirement, line is fed into converter with feeding wire machine, according to cored linear diameter, carries out line feeding between 2~8 meter per seconds, line feeding argon bottom-blowing stir process simultaneously, after sample detection.The advantage is that application method is simple, strong applicability, converter terminal phosphorus content mass percent is controlled within 0.003%.
Description
Technical field
The invention belongs to Wide and Thick Slab technical field of smelting, in particular to a kind of convertor steelmaking process dephosphorization core-spun yarn, especially
It is related in a kind of convertor steelmaking process deep dephosphorization core-spun yarn and application method in furnace.
Background technique
Phosphorus is a kind of harmful element in steel, and phosphorus content height can cause steel " cold short ", makes steel cold plasticity and impacts tough
Property reduce, welding performance and cold-bending property are deteriorated；Phosphorus is the element for reducing the surface tension of steel, with increasing for phosphorus content, steel
The surface tension of liquid reduces significantly, to reduce the cracking resistance of steel；Phosphorus degree of segregation in continuous casting billet is very high, and solid in iron
Diffusion rate very little in melt, segregation are difficult to eliminate, and influence the quality of steel.The pipeline of country's Wide and Thick Slab production field production at present
Steel, offshore platform steel, oil well pipe steel, low-temperature (low temperature) vessel steel etc. are required to low phosphorus content, and stringent steel is required for phosphorus content
Kind, the lower converter terminal phosphorus content the better.In the patent applied at present at home, general converter tapping phosphorus content control range exists
Mass percent is in 0.005%~0.015% range, belongs to Low-phosphorus Steel, ultra-low phosphoretic steel smelts scope；This patent dephosphorization technology
Converter terminal phosphorus content mass percent controls within 0.003%, belongs to extremely low phosphoretic steel and smelts scope.
Low-phosphorus Steel smelting process is generally divided into two kinds: one is the deep dephosphorization techniques based on external refining, another is
Based on the deep dephosphorization technique in Converter.This technique belongs to based on the dephosphorization technology in furnace.
The Chinese patent of Publication No. CN 101831525 describes " a kind of dephosphorization method for molten iron ", mainly for large size
Converter dephosphorization of molten iron, low using low-basicity slag fusing point, the low easy slagging of molten iron temperature promotes slagging by larger ore dosage
And oxygen supply, it is blown using low oxygen supply intensity to extend duration of blast, being sufficiently mixed between slag, gold is realized in big bottom blowing intensity stirring,
It realizes dephosphorization, has dephosphorization effect good, lime consumption is few, and dephosphorization supplementary product onsumption is few, and steel slag discharges few advantage, and tapping phosphorus contains
Amount can control within 0.010~0.025wt%, and individual heat phosphorus contents can achieve 0.008wt%, be unable to satisfy extremely low
Phosphorus content, the requirement of phosphorus content≤0.005wt% steel grade.
The Chinese patent application of Publication No. CN201310150725 discloses " semi-steel dephosphorizing agent and semi-steel dephosphorizing method ",
This method is applied to the molten steel dephosphorization after vanadium-bearing hot metal vanadium extraction by converter blowing.The Dephosphorising agent by weight by 35~50% lime,
25~45% iron scale and 15~25% sodium oxide molybdena are made, and in tapping, semi-steel dephosphorizing agent are uniformly added into and has been flowed out
Molten steel, Dephosphorising agent additional amount control between 10~20Kg/t half steel, tapping complete after to molten steel bottom blowing nitrogen, nitrogen flushing terminates
After carry out pulling out Slag treatment.The advantages of operation is dephosphorization task when can reduce steelmaking converter smelting molten steel, low-phosphorous to smelt
Steel and realization less-slag operation create conditions, and dephosphorization rate can achieve 40% or more, and remaining phosphorus content needs continue to take off in converter
It removes.
The Chinese patent of Publication No. CN101935734 describes a kind of " side of reducing rephosphorization amount in convertor steelmaking process
Method " relates generally to slag making in the samples tapping process such as converter smelting latter stage, slag modification, passes through control slag properties and improves
The phosphate fixation ability of clinker, when preventing rephosphorization from single slag process being used to smelt catch carbon phosphorus content for 0.015wt%, rephosphorization of molten steel amount can be controlled
System is between 0~0.002wt%.This method is the phosphate fixation ability for improving clinker, is acted on converter molten steel phosphorus content removal
It is unobvious.
The Chinese patent of Publication No. CN101993980 describes " a kind of extremely low phosphoretic steel smelting process ", relates generally to
Carry out dephosphorizing pretreatment in converter and then carry out double slags or single slag blowing production Low-phosphorus Steel, using top blast oxygen and bottom blowing nitrogen,
The combined blowing process that argon gas combines.Using this method, molten iron phosphorus content after dephosphorizing pretreatment can be made to be reduced to
0.010wt% or so, converter terminal phosphorus content are reduced to 25ppm or less.After this method needs strict control to pre-process
Carbon content and temperature, carbon content will control between 2.5~3.5wt%, and temperature is controlled at 1300~1400 DEG C, and need to subtract
The charge weight of few steel scrap.
This method compensates for the deficiency of existing deep dephosphorization method, and application method is simple, strong applicability, and dephosphorization effect is steady
It is fixed.
Summary of the invention
The purpose of the present invention is to provide a kind of convertor steelmaking process dephosphorization core-spun yarns, solve existing dephosphorizing technology,
It is unable to satisfy current Wide and Thick Slab production field requirement phosphorus content more lower better problem.Suitable for pipe line steel, offshore platform steel,
Oil well pipe steel and low-temperature (low temperature) vessel steel etc. require phosphorus content stringent steel grade.
A kind of convertor steelmaking process dephosphorization core-spun yarn, is made of steel strip, Dephosphorising agent and aggregate.Wherein, steel is thin
The material of band is Q345 steel series, and steel strip thickness is 0.3mm~0.8mm；Dephosphorising agent is pulvis, chemical analysis quality
Percentage are as follows: CaO:50~70%, SiO2: 5~10%, Fe2O3: 8~15%, CaCO3: 8~15%, Na2CO3: 6~12%,
Surplus is a small amount of inevitable impurity element；Aggregate is the fluorite of 2~5mm of granularity；Aggregate accounts for 8 without steel strip gross mass
~12%.
The preparation method of above-mentioned core-spun yarn, specific step and parameter are as follows:
1, it prepares aggregate: fluorite ore being crushed, is dried and is sieved, the granularity after screening is used as bone in the part 2~5mm
Material, the weight of aggregate account for 8~12% without steel strip gross mass；
2, Dephosphorising agent is pulvis Dephosphorising agent, chemical analysis mass percent are as follows: CaO:50~70%, SiO2: 5~
10%, Fe2O3: 8~15%, CaCO3: 8~15%, Na2CO3: 6~12%, surplus is a small amount of inevitable impurity element；
3, pulvis Dephosphorising agent and aggregate machinery are mixed；
4, the steel strip on external sheath, steel strip material are Q345 steel series, steel strip thickness after the completion
For 0.3mm~0.8mm；
5,10~20mm of finished product cored linear diameter.
The application method of above-mentioned core-spun yarn, specific step and parameter are as follows:
1, molten steel passes through converter smelting, and after carbon content reaches smelting steel grade requirement, progress dephosphorization operation will using feeding wire machine
Core-spun yarn is fed in converter；
2, according to cored linear diameter, line feeding is carried out between 2~8 meter per seconds, cored linear diameter is bigger, and wire-feeding velocity is lower；
Line feeding while argon bottom-blowing stir process, bottom blowing amount is in 10~30NL3/min；
3, molten steel is poured into sample detection after ladle after line feeding.
It is an advantage of the current invention that dephosphorization core-spun yarn controls converter terminal phosphorus content mass percent 0.003%
Within, compensate for the deficiency of existing deep dephosphorization method.Application method is simple, strong applicability, and dephosphorization effect is stablized.
Specific embodiment
Embodiment 1
A kind of convertor steelmaking process dephosphorization core-spun yarn, is made of steel strip, Dephosphorising agent and aggregate.Wherein, steel is thin
The material of band is Q345 steel series, and steel strip thickness is 0.4mm；Dephosphorising agent is pulvis, chemical analysis mass percent
Are as follows: CaO:58.75%, SiO2: 7.28%, Fe2O3: 13.62%, CaCO3: 8.65%, Na2CO3: 10.95%, surplus is a small amount of
Inevitable impurity element；Aggregate is the fluorite of granularity 5mm；Aggregate accounts for 11.24% without steel strip gross mass.
Domestic 100 tons of converter smelting Q345-Z35 construction(al)steels of certain steel mill, after converter smelting latter stage catch carbon, endpoint carbon content
For 0.08wt%, Mn content is 0.12wt%, and catch carbon temperature is 1675 DEG C, feeds 620 meters of dephosphorization core-spun yarn, wire-feeding velocity 4
Meter per second, cored linear diameter are 13mm, and argon bottom-blowing flow is 20NL3/ min, molten steel phosphorus content testing result before this method is implemented
For 0.009wt%, molten steel is poured into sample detection after ladle, phosphorus content 0.003wt% after line feeding.
Embodiment 2
A kind of convertor steelmaking process dephosphorization core-spun yarn, is made of steel strip, Dephosphorising agent and aggregate.Wherein, steel is thin
The material of band is Q345 steel series, and steel strip thickness is 0.5mm；Dephosphorising agent is pulvis, chemical analysis mass percent
Are as follows: CaO:61.51%, SiO2: 8.69%, Fe2O3: 12.47%, CaCO3: 7.95%, Na2CO3: 8.72%, surplus is a small amount of
Inevitable impurity element；Aggregate is the fluorite of granularity 4mm；Aggregate accounts for 10.58% without steel strip gross mass.
Domestic 100 tons of converter smelting X80MS hydrogen sulfide corrosion resistant pipe line steels of certain steel mill, after converter smelting latter stage catch carbon, eventually
Point carbon content is 0.06wt%, and Mn content is 0.14wt%, and catch carbon temperature is 1682 DEG C, feeds 435 meters of dephosphorization core-spun yarn, line feeding
Speed is 3 meter per seconds, and cored linear diameter is 13mm, and argon bottom-blowing flow is 20NL3/ min, molten steel phosphorus content before this method is implemented
Testing result be 0.007wt%, molten steel is poured into sample detection after ladle, phosphorus content 0.0026wt% after line feeding.
Claims (3)
1. a kind of convertor steelmaking process dephosphorization core-spun yarn, which is characterized in that core-spun yarn is by steel strip, Dephosphorising agent and aggregate group
At the material of steel strip is Q345 steel series, and steel strip thickness is 0.3mm~0.8mm；Dephosphorising agent chemical analysis quality
Percentage are as follows: CaO:50~70%, SiO2: 5~10%, Fe2O3: 8~15%, CaCO3: 8~15%, Na2CO3: 6~12%,
Surplus is a small amount of inevitable impurity element；Aggregate is the fluorite of 2~5mm of granularity；
The preparation method of above-mentioned core-spun yarn, specific step and parameter are as follows:
1) it preparing aggregate: fluorite ore being crushed, is dried and is sieved, the granularity after screening is used as aggregate in the part 2~5mm,
Aggregate accounts for 8~12% without steel strip gross mass；
2) Dephosphorising agent is pulvis Dephosphorising agent, chemical analysis mass percent are as follows: CaO:50~70%, SiO2: 5~10%,
Fe2O3: 8~15%, CaCO3: 8~15%, Na2CO3: 6~12%, surplus is a small amount of inevitable impurity element；
3) pulvis Dephosphorising agent and aggregate machinery are mixed；
4) steel strip, steel strip material are Q345 steel series on external sheath after the completion of, and steel strip thickness is
0.3mm~0.8mm；
5) 10~20mm of finished product cored linear diameter.
2. core-spun yarn according to claim 1, which is characterized in that the Dephosphorising agent is pulvis.
3. core-spun yarn according to claim 1, which is characterized in that the application method specific step and parameter of the core-spun yarn
It is as follows:
1) molten steel passes through converter smelting, carbon content reaches smelt steel grade requirement after, dephosphorization operation is carried out, using feeding wire machine by cored
Line is fed in converter；
2) according to cored linear diameter, line feeding, line feeding while argon bottom-blowing stir process, bottom blowing amount are carried out between 2~8 meter per seconds
In 10~30NL3/min；
3) molten steel is poured into sample detection after ladle after line feeding.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811297745.3A CN109280745A (en) | 2018-10-31 | 2018-10-31 | A kind of convertor steelmaking process dephosphorization core-spun yarn |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811297745.3A CN109280745A (en) | 2018-10-31 | 2018-10-31 | A kind of convertor steelmaking process dephosphorization core-spun yarn |
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| CN109280745A true CN109280745A (en) | 2019-01-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112961962A (en) * | 2021-02-04 | 2021-06-15 | 东北大学 | Composite dephosphorizing agent for tapping after furnace, preparation method and application |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1182799A (en) * | 1997-10-08 | 1998-05-27 | 冶金工业部钢铁研究总院 | Pre-dephosporizing method for molten iron |
| CN1524969A (en) * | 2003-02-28 | 2004-09-01 | 宝山钢铁股份有限公司 | Melted iron dephosphorization agent using vessel slag as raw material |
| CN101328528A (en) * | 2008-06-30 | 2008-12-24 | 鞍钢股份有限公司 | Core cabling wire for secondary refining dephosphorization to produce ultra-low phosphorus steel and preparation thereof |
| CN105132628A (en) * | 2015-09-16 | 2015-12-09 | 营口联众冶金技术有限公司 | Heterogeneous efficient dephosphorization agent and preparing method of heterogeneous efficient dephosphorization agent |
| CN107674939A (en) * | 2017-09-29 | 2018-02-09 | 四川德胜集团钒钛有限公司 | A kind of dephosphorization slagging agent and its application |
-
2018
- 2018-10-31 CN CN201811297745.3A patent/CN109280745A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1182799A (en) * | 1997-10-08 | 1998-05-27 | 冶金工业部钢铁研究总院 | Pre-dephosporizing method for molten iron |
| CN1524969A (en) * | 2003-02-28 | 2004-09-01 | 宝山钢铁股份有限公司 | Melted iron dephosphorization agent using vessel slag as raw material |
| CN101328528A (en) * | 2008-06-30 | 2008-12-24 | 鞍钢股份有限公司 | Core cabling wire for secondary refining dephosphorization to produce ultra-low phosphorus steel and preparation thereof |
| CN105132628A (en) * | 2015-09-16 | 2015-12-09 | 营口联众冶金技术有限公司 | Heterogeneous efficient dephosphorization agent and preparing method of heterogeneous efficient dephosphorization agent |
| CN107674939A (en) * | 2017-09-29 | 2018-02-09 | 四川德胜集团钒钛有限公司 | A kind of dephosphorization slagging agent and its application |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112961962A (en) * | 2021-02-04 | 2021-06-15 | 东北大学 | Composite dephosphorizing agent for tapping after furnace, preparation method and application |
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Application publication date: 20190129 |