CN109628694A - A kind of ultralow nitrogen ultralow titanium molten steel refining agent and preparation method - Google Patents
A kind of ultralow nitrogen ultralow titanium molten steel refining agent and preparation method Download PDFInfo
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- CN109628694A CN109628694A CN201811630600.0A CN201811630600A CN109628694A CN 109628694 A CN109628694 A CN 109628694A CN 201811630600 A CN201811630600 A CN 201811630600A CN 109628694 A CN109628694 A CN 109628694A
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- refining agent
- ultralow
- molten steel
- component
- titanium
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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
- C21C7/06—Deoxidising, e.g. killing
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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
Abstract
The invention discloses a kind of ultralow nitrogen ultralow titanium molten steel refining agent and preparation methods, the refining agent is made of component A and component B, the component A is low titanium active lime, the ingredient of the component B and dosage are industrial aluminum ash, bauxite or calcium slag is single or one kind of any combination, the refining agent is basicity R:3.0-5.0(CaO/SiO2), N≤0.02%, Ti≤0.015%.The molten steel refining agent is made of advanced fritting vacuum refining process, and ingredient is uniform, and it is convenient to examine, convenient for mechanical and hand stock.The present invention is without dust, and safety and environmental protection in use, harmful element N and Ti content is extremely low, convenient for storage and transport, oxidation by air is not easy when using at high temperature, recovery rate is high, and deoxidation effectiveness is high in slag, and speed is fast, is optimal high-cleanness, high molten steel refining agent.
Description
Technical field
The invention belongs to molten steel refining agent technical fields, and in particular to a kind of ultralow nitrogen ultralow titanium molten steel refining agent and preparation
Method.
Background technique
Ti, O, N element have stronger affinity, and in steelmaking process, three is easy to combine, and form microinclusions
TiO2, TiN and TiC etc..These microinclusions can reduce the degree of purity of steel, lead to continuous casting sprue dross, inhibit annealing process
Middle crystal grain is grown up, and reduces the favorable texture of annealing process, and then influence all kinds of performances of steel.Therefore, the dedicated special steel grade in part,
Such as electrical sheet, bearing steel, spring steel all propose strict demand to the Ti content in steel, it is desirable to its content≤30 × 10-6,
Even≤10 × 10-6。
All kinds of research datas show, the TiO in ladle top slag2Content is higher, and the ladle top slag quantity of slag is bigger, the mobility of slag
It is better, it is more from the Ti shifted in slag into steel.The higher steel grade of Al content, the increase of Ti are more obvious.TiO in slag2Also
Original reaction can indicate are as follows: 4 [Al]+3 (Ti02)=2 (Al2O3)+3[Ti]
In the smelting process of bearing steel, [Ti] and [N] can generate TiN in molten steel, this be a kind of hard with irregular figure and
Crisp field trash, it is larger to the fatigue life harm of bearing.Data show that when in bearing steel titanium mass fraction be more than 30 ×
10-6When, fatigue life obviously begins to decline.
It is excellent clearly stipulate that GCr15 bearing steel has upper limit requirement to Ti content in the GB/T18254-2016 carried out recently
Matter steel≤0.0050%, high-duty cast steel≤0.0030%, superfine high-quality steel≤0.0015%.Purpose, exactly in order to reduce in steel
Influence of the TiN field trash to fatigue life.Within the scope of bearing steel liquidus temperature 1724K and solidus temperature 1598K, it is in
The precipitation region of TiN, in process of setting, with the reduction of temperature, the solubility of Ti and N in steel is gradually decreased, and works as concentration
TiN is precipitated when reaching certain value in product.Simultaneously as there is choosing point crystallization in molten steel solidification, in Ti, N concentration ratio of solidification end
Matrix is high, if TIN is precipitated at this time, there is also the possibility of agglomeration, may be right if generating the TiN field trash of bulky grain
The quality of finished steel generates biggish harm.Therefore, it is precipitated to reduce TIN, Ti in steel, N content should be reduced as far as possible.Therefore,
Bearing steel manufacturer must be using the control of Ti in molten steel as a vital task.Control the method that TiN is generated in bearing steel
It is the content for reducing N and Ti in molten steel, other than low titanium molten iron, alloy, one of most important pollution sources are exactly molten steel refining agent
Or modification agent.
In LF refining and vacuum process, because Ti and N in common refining agent can be restored in reducing atmosphere
Into molten steel, refining is finished under good reducing atmosphere, and the content of Ti reaches peak.Therefore, all kinds of high-end in order to meet
The technique requirement of variety steel, while the new process for reducing production cost being made to have realization condition, it is ensured that stable product quality can
Control.Just there is an urgent need to develop a kind of ultralow nitrogen ultralow titanium molten steel refining agent and preparation method, Ti and N content existing to substitute
Higher common ladle refining agent (modification agent).
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of no dust, safety and environmental protection, harmful elements
N and Ti content is extremely low, the ultralow nitrogen ultralow titanium molten steel refining agent of high-cleanness, high.
Another object of the present invention is to provide a kind of ultralow nitrogen ultralow titanium molten steel refining agent preparation methods.
In order to reach above-mentioned purpose of design, the technical scheme adopted by the invention is that: a kind of ultralow nitrogen ultralow titanium molten steel essence
Refine agent, it is characterised in that: the refining agent is made of component A and component B, and the component A is low titanium active lime, and dosage is
The ingredient of mass percent 30-50%, the component B and dosage are industrial aluminum ash, bauxite or calcium slag is single or any combination
One kind, dosage are mass percent 50-70%, and the refining agent is basicity R:3.0-5.0(CaO/SiO2), N≤0.02%, Ti≤
0.015%, the refining agent is made of fritting vacuum refining process, each portion's index grouping of final products are as follows:
| Project | SiO2% | CaO% | Al2O3% | N% | Ti% | P% | S% |
| Index | ≤10 | 35-50 | 25-35 | ≤0.020 | ≤0.015 | ≤0.08 | ≤0.1 |
The preparation method of the ultralow nitrogen ultralow titanium molten steel refining agent, it is characterised in that production craft step is as follows:
Step (1): material prepares, and according to the requirement of factory formula, the qualified raw material of required various inspections are passed through conveying device
It is transported to corresponding feed bin storage；
Step (2): ingredient, according to raw material ratio, 5-10 tons of every batch of of production tonnage is weighed using high-accuracy weighing hopper, point
Angle value is 10kg, accuracy class 3 ‰；
Step (3): the various raw material of accurate measurement are delivered to blender using closed transportion device when feeding by feeding
In；
Step (4): stirring takes two closed mixer sequencings to be stirred, it is ensured that continuous production, mixing time
Control is in 5 ~ 10min, 50-100 revs/min of blender revolving speed；
Step (5): the material stirred evenly is put into storage tank, is transported to mineral hot furnace high hopper by screw feeder system, opens
In high hopper blanking to mineral hot furnace, heat up；
Step (6): being warming up to 1550-1600 DEG C, keeps clinker molten state, good fluidity；It is proposed electrode, rotation to waiting
Position；By vaccum gland bonnet, rotates to working position, vacuumized using vacuum pump, vacuum degree≤100Pa, the retention time >=30min；
Step (7): natural cooling of coming out of the stove is broken into the bulk of 5-40mm；
Step (8): sampling observation, sampling observation gained finished product, it is ensured that up-to-standard, meet the requirements standard；
Step (9): packaging and preservation.
The component A is low titanium active lime, Ti content≤0.01%, fineness 5-30mm.
The ingredient of the component B and dosage are industrial aluminum ash, bauxite or calcium slag is single or one kind of any combination, industry
Aluminium ash fineness is 200-600 mesh, and bauxite fineness is 5-30mm, and calcium slag fineness is 5-35mm.
It is ultralow nitrogen, ultralow titanium material, wherein N≤0.02%, Ti≤0.015% the invention has the advantages that: the refining agent.It can
To reduce nitrogen increased amount and increasing titanium amount of the molten steel in tapping wash heat or refining process；Basicity R:3.0-5.0(CaO/SiO2), have steady
The function of fixed removing entire oxygen content in the steel, can form reduction wash heat, it is ensured that desulfurization effect during wash heat；In use process,
Increase steel slag contact area, effective desulfurization and while dross inclusion adsorption, it can be achieved that the isolation of molten steel and air, prevents molten steel two
Secondary oxidation causes set eye pause to pour accident；Prevent in traditional wash heat material and Steel ladle modifier use process, dust is big, smog is dense,
Duration is long, be easy to cause tapping slag and refinery environment contamination accident the problem of not being available, and fume amount is few in use,
It can be completely disappeared in 2 minutes, converter or electric furnace steel tapping operation will not be had an impact, P high waste product can be prevented, N in material≤
0.02%, nitrogen pick-up phenomenon of molten steel during essence amount can be effectively prevent.The molten steel refining agent uses advanced fritting vacuum refining
Technique is made, and ingredient is uniform, and it is convenient to examine, convenient for mechanical and hand stock.Without dust, safety and environmental protection in use has the present invention
Evil element N and Ti content is extremely low, convenient for storage and transport, oxidation by air is not easy when using at high temperature, recovery rate is high, in slag
Deoxidation effectiveness is high, and speed is fast, is optimal high-cleanness, high molten steel refining agent.
Specific embodiment
A specific embodiment of the invention is described in detail below.A kind of ultralow nitrogen ultralow titanium molten steel refining agent and preparation
Method, the refining agent are made of component A and component B, and the component A is low titanium active lime, and dosage is mass percent
The ingredient of 30-50%, the component B and dosage are industrial aluminum ash, bauxite or calcium slag is single or one kind of any combination, dosage
For mass percent 50-70%, the refining agent is basicity R:3.0-5.0(CaO/SiO2), N≤0.02%, Ti≤0.015%, institute
It states refining agent to be made of fritting vacuum refining process, each portion's index grouping of final products are as follows:
| Project | SiO2% | CaO% | Al2O3% | N% | Ti% | P% | S% |
| Index | ≤10 | 35-50 | 25-35 | ≤0.020 | ≤0.015 | ≤0.08 | ≤0.1 |
The fritting vacuum refining process, production craft step are as follows:
Step (1): material prepares, and according to the requirement of factory formula, the qualified raw material of required various inspections are passed through conveying device
It is transported to corresponding feed bin storage；
Step (2): ingredient, according to raw material ratio, 5-10 tons of every batch of of production tonnage is weighed using high-accuracy weighing hopper, point
Angle value is 10kg, accuracy class 3 ‰；
Step (3): the various raw material of accurate measurement are delivered to blender using closed transportion device when feeding by feeding
In；
Step (4): stirring takes two closed mixer sequencings to be stirred, it is ensured that continuous production, mixing time
Control is in 5 ~ 10min, 50-100 revs/min of blender revolving speed；
Step (5): the material stirred evenly is put into storage tank, is transported to mineral hot furnace high hopper by screw feeder system, opens
In high hopper blanking to mineral hot furnace, heat up；
Step (6): being warming up to 1550-1600 DEG C, keeps clinker molten state, good fluidity；It is proposed electrode, rotation to waiting
Position；By vaccum gland bonnet, rotates to working position, vacuumized using vacuum pump, vacuum degree≤100Pa, the retention time >=30min.
Step (7): natural cooling of coming out of the stove is broken into the bulk of 5-40mm.
Step (8): sampling observation, sampling observation gained finished product, it is ensured that up-to-standard, meet the requirements standard；
Step (9): packaging and saving, according to packing instructions, every bag of packaging error of pouch≤0.5kg/ bags, ton packaging error≤
2kg/ tons.
The component A is low titanium active lime, Ti content≤0.01%, fineness 5-30mm.
The ingredient of the component B and dosage are industrial aluminum ash, bauxite or calcium slag is single or one kind of any combination, industry
Aluminium ash fineness is 200-600 mesh, and bauxite fineness is 5-30mm, and calcium slag fineness is 5-35mm.
When the present invention uses: ultralow nitrogen ultralow titanium molten steel refining agent is put into the surface of molten steel, liquid steel refining after investment
Agent is merged in slag immediately, starts to melt under the action of high temperature, and the agitation top of the slag promotes molten steel refining agent fusing to sprawl, rapidly and furnace
Slag, which combines, forms target slag system, and the nocuousness adsorbed in steel is mingled with, and can play the purpose of deoxidation in slag.Meanwhile because of its nocuousness
Element N and Ti content is extremely low, can effectively avoid nitrogen pick-up and increases titanium phenomenon, reaches the manufacturing technique requirent of high-end variety steel.
Claims (4)
1. a kind of ultralow nitrogen ultralow titanium molten steel refining agent, it is characterised in that: the refining agent is made of component A and component B, described
Component A is low titanium active lime, and dosage is mass percent 30-50%, the ingredient of the component B and dosage be industrial aluminum ash,
Bauxite or calcium slag is single or one kind of any combination, dosage is mass percent 50-70%, and the refining agent is basicity R:
3.0-5.0(CaO/SiO2), N≤0.02%, Ti≤0.015%, the refining agent is made of fritting vacuum refining process, final
Each portion's index grouping of product are as follows:
。
2. a kind of ultralow nitrogen ultralow titanium molten steel refining agent as described in claim 1, it is characterised in that: the component A is low titanium
Active lime, Ti content≤0.01%, fineness 5-30mm.
3. a kind of ultralow nitrogen ultralow titanium molten steel refining agent as described in claim 1, it is characterised in that: the ingredient of the component B
For industrial aluminum ash, bauxite or calcium slag is single or one kind of any combination, and industrial aluminum ash fineness is 200-600 mesh, and bauxite is thin
Degree is 5-30mm, and calcium slag fineness is 5-35mm.
4. a kind of ultralow nitrogen ultralow titanium molten steel refining agent as described in claim 1, it is characterised in that production craft step is as follows:
Step (1): material prepares, and according to the requirement of factory formula, the qualified raw material of required various inspections are passed through conveying device
It is transported to corresponding feed bin storage；
Step (2): ingredient, according to raw material ratio, 5-10 tons of every batch of of production tonnage is weighed using high-accuracy weighing hopper, point
Angle value is 10kg, accuracy class 3 ‰；
Step (3): the various raw material of accurate measurement are delivered to blender using closed transportion device when feeding by feeding
In；
Step (4): stirring takes two closed mixer sequencings to be stirred, it is ensured that continuous production, mixing time
Control is in 5 ~ 10min, 50-100 revs/min of blender revolving speed；
Step (5): the material stirred evenly is put into storage tank, is transported to mineral hot furnace high hopper by screw feeder system, opens
In high hopper blanking to mineral hot furnace, heat up；
Step (6): being warming up to 1550-1600 DEG C, keeps clinker molten state, good fluidity；It is proposed electrode, rotation to waiting
Position；By vaccum gland bonnet, rotates to working position, vacuumized using vacuum pump, vacuum degree≤100Pa, the retention time >=30min；
Step (7): natural cooling of coming out of the stove is broken into the bulk of 5-40mm；
Step (8): sampling observation, sampling observation gained finished product, it is ensured that up-to-standard, meet the requirements standard；
Step (9): packaging and saving, according to packing instructions, every bag of packaging error of pouch≤0.5kg/ bags, ton packaging error≤
2kg/ tons.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811630600.0A CN109628694A (en) | 2018-12-29 | 2018-12-29 | A kind of ultralow nitrogen ultralow titanium molten steel refining agent and preparation method |
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|---|---|---|---|
| CN201811630600.0A CN109628694A (en) | 2018-12-29 | 2018-12-29 | A kind of ultralow nitrogen ultralow titanium molten steel refining agent and preparation method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102409140A (en) * | 2010-09-26 | 2012-04-11 | 宝山钢铁股份有限公司 | Refined slag used in steel-making process for bearing steel |
| CN102787211A (en) * | 2012-06-28 | 2012-11-21 | 辽宁中汇环保科技有限公司 | Method for producing high-quality low-sulfur steel by using aluminium and calcium premelted refining slag |
| CN102787213A (en) * | 2012-06-28 | 2012-11-21 | 辽宁中汇环保科技有限公司 | Aluminium-calcareous premelted refining slag for low-cost steel-making and method for preparing same |
| CN106086298A (en) * | 2016-06-24 | 2016-11-09 | 山东钢铁股份有限公司 | A kind of smelting process of low-phosphorous low titanium low-sulfur steel |
| CN107312906A (en) * | 2017-07-10 | 2017-11-03 | 西王金属科技有限公司 | A kind of smelting process of inexpensive ultrapure low titanium bearing steel |
-
2018
- 2018-12-29 CN CN201811630600.0A patent/CN109628694A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102409140A (en) * | 2010-09-26 | 2012-04-11 | 宝山钢铁股份有限公司 | Refined slag used in steel-making process for bearing steel |
| CN102787211A (en) * | 2012-06-28 | 2012-11-21 | 辽宁中汇环保科技有限公司 | Method for producing high-quality low-sulfur steel by using aluminium and calcium premelted refining slag |
| CN102787213A (en) * | 2012-06-28 | 2012-11-21 | 辽宁中汇环保科技有限公司 | Aluminium-calcareous premelted refining slag for low-cost steel-making and method for preparing same |
| CN106086298A (en) * | 2016-06-24 | 2016-11-09 | 山东钢铁股份有限公司 | A kind of smelting process of low-phosphorous low titanium low-sulfur steel |
| CN107312906A (en) * | 2017-07-10 | 2017-11-03 | 西王金属科技有限公司 | A kind of smelting process of inexpensive ultrapure low titanium bearing steel |
Non-Patent Citations (1)
| Title |
|---|
| 张立峰 等: "《轴承钢中非金属夹杂物和元素偏析》", 31 January 2017, 冶金工业出版社 * |
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Application publication date: 20190416 |