CN109576442A - A kind of ultralow boron molten steel refining agent of ultralow nitrogen and preparation method - Google Patents

A kind of ultralow boron molten steel refining agent of ultralow nitrogen and preparation method Download PDF

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Publication number
CN109576442A
CN109576442A CN201811630611.9A CN201811630611A CN109576442A CN 109576442 A CN109576442 A CN 109576442A CN 201811630611 A CN201811630611 A CN 201811630611A CN 109576442 A CN109576442 A CN 109576442A
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CN
China
Prior art keywords
ultralow
refining agent
boron
molten steel
component
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Pending
Application number
CN201811630611.9A
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Chinese (zh)
Inventor
王庆社
余振西
刘显
李欣
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Xixia Yaohui Metallurgical Materials Co Ltd
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Xixia Yaohui Metallurgical Materials Co Ltd
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Priority to CN201811630611.9A priority Critical patent/CN109576442A/en
Publication of CN109576442A publication Critical patent/CN109576442A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/06Deoxidising, e.g. killing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/064Dephosphorising; Desulfurising

Abstract

The invention discloses a kind of ultralow boron molten steel refining agent of ultralow nitrogen and preparation methods, the refining agent is made of component C and component D, the component C is low boron active lime, the ingredient of the component D 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%, B≤0.001%.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 B content are 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

A kind of ultralow boron molten steel refining agent of ultralow nitrogen and preparation method
Technical field
The invention belongs to molten steel refining agent technical fields, and in particular to a kind of ultralow boron molten steel refining agent of ultralow nitrogen and preparation Method.
Background technique
Low-welding crack-sensitive high-strength steel in engineering machinery, bridge, is built with its excellent toughness and tenacity and welding performance It builds, the fields such as petroleum, chemical industry are widely used.As all kinds of engineering structures are to enlargement, lightweight, high parameter Development, the demand of high intensity levels steel plate just gradually increase, while to its low-temperature flexibility, mouldability, weldability, fracture toughness Etc. the requirements of comprehensive performances be also continuously improved.Boron is to significantly improve one of element of harden ability of steel, since boron is easy to Austenite grain boundary segregation inhibits pro-eutectoid ferrite in the forming core of austenite grain boundary, promotes the formation of bainite or martensite, from And it can largely improve the intensity of steel.
On the other hand, boron-containing steel is influenced very big by welding procedure, can be greatlyd improve under different welding procedures strong Degree, but it is unfavorable to plasticity and toughness, and elongation and ballistic work decrease.Under different welding conditions, the work of boron With effect difference, the influence to the final weld properties of product also has biggish difference.
The main function of boron is the harden ability for improving steel, because minimal amount of boron (0.0005%-0.0030%) energy is added Improve the harden ability of steel.Boron is adsorbed on austenite grain boundary as surface active element, the effect for delaying γ-a to change, The segregation of austenite grain boundary hinders ferritic forming core, and is conducive to the formation of bainite, therefore delays to want to what ferrite generated It compares bainite and delays much bigger, thus improve harden ability.
It is to improve the solubility of alloying element that boron, which postpones the indirect effect that γ-a changes, because alloying element is in austenite In solubility be higher than ferrite, therefore postponed from ageing behavior, made material after rolling due to timeliness and further strong Change.It is very small to the effect for improving harden ability when boron amount is lower than 0.0005%, the boron phase generated in steel, edge can be made higher than 0.003% Austenite grain boundary is precipitated, and generates hot-short phenomenon.Solubility of the boron in steel is although extremely low, and mechanism of action is sufficiently complex.Boron and Nitrogen, oxygen have very strong affinity, have a strong interaction with various defects, and can with S, C, N chemical combination, and in Yi Yugang Other elements form various types of field trashes.
Clearly stipulate that all grade bridge steels have the upper limit to want B content in standard GB/T714-2015 carried out recently It asks, is not greater than 0.0005%.The exigent high-strength line-pipe steel of welding quality also clearly indicates B content all in order The upper limit, usually forbid more than 0.0008%.The special order in part, or even require to have to be lower than 0.0005%.Therefore, bridge steel and Pipe line steel manufacturer must be using the control of N in molten steel and B as a vital task.The source of N and B in molten steel, in addition to low Outside ferro-boron water, alloy, one of most important pollution sources are exactly molten steel refining agent or modification agent.
In LF refining and vacuum process, because B 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 B reaches peak.Therefore, in order to meet all kinds of high-end product The technique requirement of kind steel, while the new process for reducing production cost being made to have realization condition, it is ensured that stable product quality is controllable. Just there is an urgent need to develop a kind of ultralow boron molten steel refining agent of ultralow nitrogen and preparation method, existing to substitute, B and N content are 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 B content are extremely low, a kind of ultralow ultralow boron molten steel refining agent of nitrogen of the molten steel refining agent of high-cleanness, high.
Another object of the present invention is to provide the preparation methods of the ultralow ultralow boron molten steel refining agent of nitrogen.
In order to reach above-mentioned purpose of design, the technical scheme adopted by the invention is that: a kind of ultralow ultralow boron steel crystal of nitrogen Refine agent, it is characterised in that: the refining agent is made of component C and component D, and the component C is low boron active lime, and dosage is matter Measure percentage 30-50%, the ingredient of the component D and dosage be industrial aluminum ash, bauxite or calcium slag is single or any combination one Kind, dosage is mass percent 50-70%, and N≤0.02%, B≤0.015%, the refining agent is basicity R:3.0-5.0(CaO/ SiO2), 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% B% P% S%
Index ≤10 35-50 25-35 ≤0.020 ≤0.001 ≤0.08 ≤0.1
The preparation method of the ultralow ultralow boron molten steel refining agent of nitrogen, 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 C is low boron active lime, boron content≤0.0008%, fineness 5-30mm.
The ingredient of the component D 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.
The refining agent is made of fritting vacuum refining process.
It is ultralow nitrogen, ultralow boron material, wherein N≤0.02%, B≤0.001% the invention has the advantages that: the refining agent.It can To reduce nitrogen increased amount and increasing boron 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 B content are extremely low, convenient for storage and transport, oxidation by air are 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 boron molten steel refining agent of ultralow nitrogen, it is described Refining agent is made of component C and component D, and the component C is low boron active lime, and dosage is mass percent 30-50%, described The ingredient of component D and dosage are industrial aluminum ash, bauxite or calcium slag is single or one kind of any combination, and dosage is mass percent 50-70%, N≤0.02%, B≤0.015%, the refining agent are basicity R:3.0-5.0(CaO/SiO2), the refining agent is pre- Molten vacuum refining process is made, each portion's index grouping of final products are as follows:
Project SiO2% CaO% Al2O3% N% B% P% S%
Index ≤10 35-50 25-35 ≤0.020 ≤0.001 ≤0.08 ≤0.1
The preparation method of the ultralow ultralow boron molten steel refining agent of nitrogen, 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 refining agent is ultralow nitrogen, ultralow boron material, wherein N≤0.02%, B≤0.001%.
The component C is low boron active lime, boron content≤0.0008%, fineness 5-30mm.
The ingredient of the component D 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: the ultralow boron molten steel refining agent of ultralow nitrogen 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 B content are extremely low, can effectively avoid nitrogen pick-up and increase boron phenomenon, reach the manufacturing technique requirent of high-end variety steel.

Claims (4)

1. a kind of ultralow boron molten steel refining agent of ultralow nitrogen, the refining agent are made of component C and component D, the component C is low boron Active lime, dosage are mass percent 30-50%, and the ingredient and dosage of the component D is industrial aluminum ash, bauxite or calcium slag Single or any combination one kind, dosage are mass percent 50-70%, and N≤0.02%, B≤0.015%, the refining agent is alkali Spend R:3.0-5.0(CaO/SiO2), the refining agent is made of fritting vacuum refining process, each portion's index grouping of final products Are as follows:
2. a kind of ultralow ultralow boron molten steel refining agent of nitrogen as described in claim 1, it is characterised in that: the component C is low boron Active lime, boron content≤0.008%, fineness 5-30mm.
3. a kind of ultralow ultralow boron molten steel refining agent of nitrogen as described in claim 1, it is characterised in that: the ingredient of the component D With dosage be industrial aluminum ash, bauxite or calcium slag is single or one kind of any combination, and industrial aluminum ash fineness is 200-600 mesh, aluminium Alumina fineness is 5-30mm, and calcium slag fineness is 5-35mm.
4. a kind of preparation method of the ultralow boron molten steel refining agent of ultralow nitrogen, 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.
CN201811630611.9A 2018-12-29 2018-12-29 A kind of ultralow boron molten steel refining agent of ultralow nitrogen and preparation method Pending CN109576442A (en)

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Application Number Priority Date Filing Date Title
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101365819A (en) * 2005-12-27 2009-02-11 Posco公司 Steel wire having excellent cold heading quality and quenching property and method for producing the same
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
CN107841687A (en) * 2017-11-15 2018-03-27 南阳汉冶特钢有限公司 A kind of smelting process of ultralow boron steel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101365819A (en) * 2005-12-27 2009-02-11 Posco公司 Steel wire having excellent cold heading quality and quenching property and method for producing the same
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
CN107841687A (en) * 2017-11-15 2018-03-27 南阳汉冶特钢有限公司 A kind of smelting process of ultralow boron steel

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Application publication date: 20190405