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 PDFInfo
- 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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- Prior art keywords
- ultralow
- refining agent
- boron
- molten steel
- component
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- 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.)
- Pending
Links
- 229910052796 boron Inorganic materials 0.000 title claims abstract description 55
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 52
- 239000010959 steel Substances 0.000 title claims abstract description 52
- 238000007670 refining Methods 0.000 title claims abstract description 49
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 43
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000006902 nitrogenation reaction Methods 0.000 title abstract description 5
- 239000002893 slag Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000004615 ingredient Substances 0.000 claims abstract description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 11
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000011575 calcium Substances 0.000 claims abstract description 10
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 10
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 9
- 238000003860 storage Methods 0.000 claims abstract description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 7
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 7
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 7
- 239000004571 lime Substances 0.000 claims abstract description 7
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 7
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 7
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000004806 packaging method and process Methods 0.000 claims description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 6
- 239000011707 mineral Substances 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 239000004411 aluminium Substances 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 238000010924 continuous production Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 210000004907 gland Anatomy 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000012163 sequencing technique Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims 1
- 239000000428 dust Substances 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 2
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 239000000047 product Substances 0.000 description 7
- 229910001566 austenite Inorganic materials 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 229910001563 bainite Inorganic materials 0.000 description 3
- 238000010079 rubber tapping Methods 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 230000001934 delay Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 229910000712 Boron steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- 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 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
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.
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CN201811630611.9A CN109576442A (en) | 2018-12-29 | 2018-12-29 | A kind of ultralow boron molten steel refining agent of ultralow nitrogen and preparation method |
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Citations (3)
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 |
-
2018
- 2018-12-29 CN CN201811630611.9A patent/CN109576442A/en active Pending
Patent Citations (3)
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 |