CN107931551B - A kind of bloom middle low carbon steel covering slag and preparation method thereof - Google Patents
A kind of bloom middle low carbon steel covering slag and preparation method thereof Download PDFInfo
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- CN107931551B CN107931551B CN201711439724.6A CN201711439724A CN107931551B CN 107931551 B CN107931551 B CN 107931551B CN 201711439724 A CN201711439724 A CN 201711439724A CN 107931551 B CN107931551 B CN 107931551B
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- 239000002893 slag Substances 0.000 title claims abstract description 152
- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 73
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 58
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 46
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 38
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000011777 magnesium Substances 0.000 claims abstract description 35
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 35
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 34
- 239000002994 raw material Substances 0.000 claims abstract description 34
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 29
- 239000000843 powder Substances 0.000 claims abstract description 28
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052796 boron Inorganic materials 0.000 claims abstract description 24
- 239000011521 glass Substances 0.000 claims abstract description 24
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 22
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 22
- 239000010439 graphite Substances 0.000 claims abstract description 22
- 239000010436 fluorite Substances 0.000 claims abstract description 21
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 19
- 235000017550 sodium carbonate Nutrition 0.000 claims abstract description 19
- 239000010456 wollastonite Substances 0.000 claims abstract description 19
- 229910052882 wollastonite Inorganic materials 0.000 claims abstract description 19
- 239000000440 bentonite Substances 0.000 claims abstract description 18
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 18
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000004927 clay Substances 0.000 claims abstract description 17
- 239000011230 binding agent Substances 0.000 claims abstract description 16
- 239000010453 quartz Substances 0.000 claims abstract description 13
- 239000011656 manganese carbonate Substances 0.000 claims abstract description 11
- 235000006748 manganese carbonate Nutrition 0.000 claims abstract description 11
- 229940093474 manganese carbonate Drugs 0.000 claims abstract description 11
- 229910000016 manganese(II) carbonate Inorganic materials 0.000 claims abstract description 11
- XMWCXZJXESXBBY-UHFFFAOYSA-L manganese(ii) carbonate Chemical compound [Mn+2].[O-]C([O-])=O XMWCXZJXESXBBY-UHFFFAOYSA-L 0.000 claims abstract description 11
- 230000002787 reinforcement Effects 0.000 claims abstract description 9
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 claims abstract description 7
- 239000003595 mist Substances 0.000 claims description 25
- 239000000292 calcium oxide Substances 0.000 claims description 17
- 239000000126 substance Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 14
- 239000011268 mixed slurry Substances 0.000 claims description 14
- 229910052681 coesite Inorganic materials 0.000 claims description 11
- 229910052906 cristobalite Inorganic materials 0.000 claims description 11
- 239000000377 silicon dioxide Substances 0.000 claims description 11
- 229910052682 stishovite Inorganic materials 0.000 claims description 11
- 229910052905 tridymite Inorganic materials 0.000 claims description 11
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 10
- 238000001694 spray drying Methods 0.000 claims description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- 229910052593 corundum Inorganic materials 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 7
- 238000002203 pretreatment Methods 0.000 claims description 7
- 238000004537 pulping Methods 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- 239000000155 melt Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims 1
- 239000004615 ingredient Substances 0.000 claims 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims 1
- 238000007873 sieving Methods 0.000 claims 1
- 239000004575 stone Substances 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 31
- 239000010959 steel Substances 0.000 abstract description 31
- 239000000463 material Substances 0.000 abstract description 10
- 238000009628 steelmaking Methods 0.000 abstract description 7
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 3
- 230000004907 flux Effects 0.000 abstract description 3
- 238000009749 continuous casting Methods 0.000 description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 238000000034 method Methods 0.000 description 10
- 229910052742 iron Inorganic materials 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 7
- 229910052808 lithium carbonate Inorganic materials 0.000 description 7
- 229920002472 Starch Polymers 0.000 description 6
- 235000019698 starch Nutrition 0.000 description 6
- 239000008107 starch Substances 0.000 description 6
- 239000002585 base Substances 0.000 description 5
- 239000006229 carbon black Substances 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 238000007920 subcutaneous administration Methods 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 229910001634 calcium fluoride Inorganic materials 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000000470 constituent Substances 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 241000208340 Araliaceae Species 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 2
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 2
- 235000003140 Panax quinquefolius Nutrition 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910021538 borax Inorganic materials 0.000 description 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 2
- 239000004327 boric acid Substances 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 235000008434 ginseng Nutrition 0.000 description 2
- 229920005610 lignin Polymers 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910001655 manganese mineral Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004224 protection Effects 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000004328 sodium tetraborate Substances 0.000 description 2
- 235000010339 sodium tetraborate Nutrition 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 229910001651 emery Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 150000002680 magnesium Chemical class 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Ceramic Products (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a kind of bloom middle low carbon steel covering slags and preparation method thereof; belong to steel-making metallurgic auxiliary materials field, the bloom middle low carbon steel covering slag is prepared by the raw material of following parts by weight: 19-39 parts of wollastonite, 20-40 parts of magnesium slag, 2-6 parts of quartz, 1-5 parts of bentonite, 2-6 parts of flint clay, 3-10 parts of fluorite, 1-3 parts of soda ash, 0-2 parts of manganese carbonate, 3-7 parts of boron glass powder, 1-4 parts of magnesia powder, 2-5 parts of 390 medium-carbon graphite, 3-6 parts of high-carbon amorphous graphite, 1.5-3 parts of half reinforcement gas black, 1.5-3 parts of binder and 0.2-0.4 parts of sodium lignin sulfonate.The present invention reduces the dosage of flux using inexpensive magnesium slag as raw material to improve the surface tension of covering slag, the covering slag surface tension of preparation is big; absorption is mingled with that ability is strong, and slag interface is easily separated, is not easy slag inclusion; the inclusion defect that the appearance of covering slag factor can be reduced, improves the internal soundness of clean steel.
Description
Technical field
The present invention relates to steel-making metallurgic auxiliary materials field is belonged to, more particularly, to a kind of bloom middle low carbon steel covering slag and its
Preparation method.
Background technique
Middle low carbon steel (C content 0.17-0.60%) has good mechanical property, therefore application range is very extensive.
Mild steel is since intensity is lower, using being restricted, but it is appropriate increase manganese content in carbon steel, and be added trace vanadium,
The alloying elements such as titanium, niobium are greatly improved the intensity of steel.If reducing carbon content in steel and a small amount of aluminium, a small amount of boron and carbonization being added
Object formation element, then ultra-low carbon bainite group can be obtained, and to reach its intensity very high, and keeps preferable plasticity and toughness.Medium carbon steel
Intensity, hardness are higher than mild steel, and plasticity and toughness are lower than mild steel, thermally treated can not directly use hot rolling material, cold drawing material,
Also it can after heat treatment use；Medium carbon steel after quenching, tempering has good comprehensive mechanical property, and the highest that can reach is hard
Degree is about HRC55 (HB538), and σ b is 600~1100MPa.So middle low carbon steel as construction material in addition to using, it is also a large amount of to use
In the various machine components of manufacture.
Due to the property and purposes of middle low carbon steel, to its slag in continuous casting process and it is mingled with situation requirement very
Height, thus for middle low carbon steel continuous casting develop one kind have preferably absorption be mingled with, the segregative covering slag of slag interface it is imperative.
102019384 A of China Patent Publication No. CN discloses a kind of high viscosity continuous casting guarantor for solving surface of low-carbon steel slag inclusion
Slag is protected, raw material proportioning and weight percentage are as follows: glass powder: 0%~7%, pre- melt: 50%~70%, fluorite: 5.5%
~8.5%, white alkali: 4%~8%, N330 carbon black: 3%, graphite: 3.5%, R agent: 0%~3%, lithium carbonate: 0.5%~2%,
Manganese carbonate: 2%~5%, magnesia 2%~5%, aluminium vanadine: 3%~7%, ice crystal: 1%~3%, adhesive: 1%~3%,
Water-reducing agent 0.3%~1%.The invention solves the problems, such as that the high viscosity continuous casting covering slag of low-carbon steel continuous casting billet Surface inclusion mainly exists
CaO、SiO2On the basis of, the fluxing agents such as additional a certain amount of lithium carbonate, fluorite, white alkali and certain carbon black, graphite carbonaceous material,
It is improved in viscosity, surface tension increases, and under same process conditions, can effectively prevent the generation of casting billet surface slag inclusion phenomenon.In
State patent publication No. CN1824429A discloses a kind of high draw speed plate blank continuous casting low carbon steel crystallizer protective slag, overcomes high pulling rate plate
Liquid slag layer is thin in the prior art for base continuous casting low carbon steel, insufficient lubrication, and bonding steel leakage, casting billet surface slag inclusion and dry slag quality is caused to ask
Topic.Covering slag is by melting charge, lithium carbonate, sodium carbonate, fluorite, quartz sand, wollastonite, manganese mineral powder, iron cement, carbon black, swelling local soil type
At the weight percent of constituent are as follows: melting charge 50-65%, lithium carbonate 1.2-3.6%, sodium carbonate 2.3-6.0%, fluorite
3.0-6.9%, quartz sand 6.0-9.5%, wollastonite 7.0-10.0%, manganese mineral powder 5.0-9.0%, iron cement 1.0-3.5%, carbon black 2.0-
7.0%, bentonite 2.0-5.5%.Covering slag spreadability, heat insulating ability, meltdown property in crystallizer is good, and four faces pass in crystallizer
Heat is stable and uniform, and for liquid slag layer with a thickness of 8-12mm, slag item is few, and covering slag lubricity is good, prevents sticker type breakout, slab table
Without slag inclusion and dry slag phenomenon, cc billet surface quality is good in face.
Above-mentioned two patents are all made of pre- melt and lithium carbonate, all higher especially lithium carbonate of both prices of raw materials,
A kind of high-cost scheme, promoted under current market situation it is highly difficult, furthermore this two patents all be suitable for slab
Continuous casting, the carbon content of plate blank continuous casting low carbon steel are as follows: 0.01≤C≤0.08%, 0.017≤C of mild steel range of bloom≤
0.25%, above-mentioned covering slag is not suitable for the mild steel of bloom.
Summary of the invention
In view of this, in view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of protections of bloom middle low carbon steel
Slag reduces the dosage of flux using inexpensive magnesium slag as raw material to improve the surface tension of covering slag, the covering slag surface of preparation
Tension is big, and the ability for soaking steel is strong, and absorption, which is mingled with ability, greatly to be enhanced, and slag interface is easily separated, is not easy slag inclusion, can reduce guarantor
The inclusion defect that slag factor occurs is protected, the internal soundness of clean steel is improved.
In order to achieve the above objectives, the invention adopts the following technical scheme:
A kind of bloom middle low carbon steel covering slag is prepared: 19-39 parts of wollastonite, magnesium slag by the raw material of following parts by weight
20-40 parts, 2-6 parts of quartz, 1-5 parts of bentonite, 2-6 parts of flint clay, 3-10 parts of fluorite, 1-3 parts of soda ash, 0-2 parts of manganese carbonate, boron
3-7 parts of glass powder, 1-4 parts of magnesia powder, 2-5 parts of 390 medium-carbon graphite, 3-6 parts of high-carbon amorphous graphite, half reinforcement gas black
1.5-3 parts, 1.5-3 parts of binder and 0.2-0.4 parts of sodium lignin sulfonate.
Further, the bloom middle low carbon steel covering slag is prepared: wollastonite by the raw material of following parts by weight
19-39 parts, 20-40 parts of magnesium slag, 2-6 parts of quartz, 1-5 parts of bentonite, 2-6 parts of flint clay, 3-10 parts of fluorite, 1-3 parts of soda ash, carbon
Sour manganese 1-2 parts, 3-7 parts of boron glass powder, 2-4 parts of magnesia powder, 2-5 parts of 390 medium-carbon graphite, 3-6 parts of high-carbon amorphous graphite, half reinforcement
1.5-3 parts of gas black, 1.5-3 parts of binder and 0.2-0.4 parts of sodium lignin sulfonate.
Further, the binder is yellow starch gum.
Further, the wollastonite, quartz, bentonite, flint clay, fluorite, soda ash, manganese carbonate, boron glass powder
Degree is 200 mesh.
Further, the physical and chemical composition of the covering slag are as follows: CaO:30.10-37.27%, SiO2: 31.49-38.22%,
MgO:3.86-6.19%, Fe2O3:≤1%, Al2O3: 2.01-3.56%, Na2O:1.32-3.02%, F-: 1.32-4.37%, B2O3:
0.84-1.94%, MnO:0-1.10%, fixed carbon: 6.37-12.74%, basicity: 0.79-1.18, melts by 1210-1280 DEG C of fusing point
Speed: 22-41s, viscosity 0.25-0.88Pas, surface tension are as follows: 326.8-363.4mN/m.
A kind of preparation method of bloom middle low carbon steel covering slag described in claim 1, comprising the following steps:
(1) pre-treatment of raw material: magnesium slag is stirred evenly, and dries its water content≤1%, is crushed to 200 mesh >=95% of granularity；
(2) slurrying: weighing each raw material by weight, be placed in pulping tank, add water and stir, and control pulp density is
0.60-0.65 prepares mixed slurry；
(3) mist projection granulating: slurry being put into ball mill and is ground, and then pressurization enters spray drying tower and made by spraying
Grain；
(4) it sieves dedusting: screening out the particle for the mist projection granulating that granularity is 20-80 mesh, low-carbon in bloom is prepared
Steel covering slag；
(5) product testing: to the bloom middle low carbon steel covering slag sample detection chemical component being prepared；
(6) it packs, storage.
Further, mixing time >=60min in the step (2).
Further, in the step (3), mixed slurry is pressurized to 1.2-1.6Mpa, temperature in the tower of spray drying tower
650-750 DEG C, outlet temperature is 140-180 DEG C.
The beneficial effects of the present invention are:
1, the present invention discloses a kind of bloom middle low carbon steel covering slag and preparation method thereof, by material composition and system
Standby to improve, the covering slag surface tension of preparation can reach 326.8-363.4mN/m, and fusing point is 1210-1270 DEG C, covering slag
The ability for soaking steel is strong, and absorption, which is mingled with ability and lubricating ability, greatly to be enhanced, and slag interface is easily separated, is not easy slag inclusion, significantly
It reduces production cost, reduce surface defects of products.
2, magnesium slag is used in raw material of the invention, when magnesium slag produces bloom middle low carbon steel covering slag as raw material,
Firstly the need of the chemical component of detection magnesium slag, SiO in the magnesium slag that raw material use can be used as2: 30-34%, CaO:53-57%,
MgO:6-9% such as detects SiO in magnesium slag2, the content of CaO and MgO it is very low, the comparision contents of impurity are high, then this magnesium slag is not
It can be used as raw material.After the chemical component in magnesium slag determines, just designed according to the needs of steel grade low in bloom
The factory formula of carbon steel covering slag.Production cost can be further decreased using magnesium slag as raw material, economical and environmentally friendly benefit is extremely aobvious
It writes.
3, the surface tension of covering slag determines the ability of melt cinder wetting steel, it is mingled with the separation of control field trash, absorption
The lubrication of object and slag film has played important function, for the covering slag of multicomponent mixture, can be calculated with empirical equation:
,
X in formulaiConstituent element molar fraction, % in ----slag；
KiThe coefficient of ----be constituent element i, the K value of different oxides are shown in Table 1:
The K value of the different oxides of table 1
The Na it can be seen from above formula2O and CaF2K value it is relatively low, reduce flux (Na2O and CaF2) dosage can
With the surface tension of effective raising covering slag.It is added compared with the preferable Li of the fluxing effect of small measurement2O and B2O3It can reach
Use relatively large Na2O and CaF2Effect, to increase the surface tension of covering slag, but Li2The addition form of O is mainly carbon
Sour lithium, and the selling at exorbitant prices of lithium carbonate at present, therefore be preferred using the material of boracic.At present containing boron material mainly have borax,
Boric acid and boron glass, and boric acid and borax easily form the crystallization water and toxic, and boron glass is stable and nontoxic, therefore in the present invention
Select boron glass as efficient fluxing agent.
4, in raw material with wollastonite and magnesium slag for main base-material, basicity is adjusted with quartz and bentonite, with fluorite, boron glass
Glass and a small amount of soda ash are as containing B in fluxing agent, especially boron glass2O328-31%, B2O3There are very strong reduction fusing point and viscosity
Effect, by add boron glass can effectively reduce Na2The dosage of O and F, so that Na be greatly reduced2O, the surface reactive materials such as F,
To improve slag surface tension, flint clay main component is Al2O3And SiO2, viscosity, carbonaceous are improved while adjusting basicity
Material uses high-carbon amorphous graphite, medium-carbon graphite and carbon black, compound to match carbon.
The main component of magnesium slag is SiO2, CaO and MgO, Na2O and CaF2Middle SiO2, CaO and MgO stable content, be free of
Some unstable oxides, MgO therein are conducive to increase slag flowing, improve consumption, improve lubrication property, and MgO
Surface tension coefficient it is big, be conducive to improve slag surface tension, but content of MgO is relatively low in magnesium slag, therefore in raw material
Add a certain amount of U.S. emery dust.
Specific embodiment
The invention will be further described combined with specific embodiments below.
Embodiment 1
A kind of bloom middle low carbon steel covering slag is prepared: 19 parts of wollastonite, magnesium slag 40 by the raw material of following parts by weight
Part, 2 parts of quartz, 2 parts of bentonite, 6 parts of flint clay, 10 parts of fluorite, 3 parts of soda ash, 7 parts of boron glass powder, 3 parts of magnesia powder, carbon in 390
2 parts of graphite, 3 parts of high-carbon amorphous graphite, 2 parts of half reinforcement gas black, 1.5 parts of binder and 0.3 part of sodium lignin sulfonate.
Wherein binder is yellow starch gum；Wollastonite, quartz, bentonite, flint clay, fluorite, soda ash, boron glass Powder Particle Size are equal
For 200 mesh.
The preparation method of above-mentioned bloom middle low carbon steel covering slag, comprising the following steps:
(1) pre-treatment of raw material: magnesium slag is stirred evenly, and dries its water content≤1%, is crushed to 200 mesh >=95% of granularity,
Through SiO in detection magnesium slag2: 31.25%, CaO:56.85%, MgO:8.86%；
(2) slurrying: after chemical component determines, then the formula of design protection slag weighs each raw material by weight, is placed in
In pulping tank, 60min is added water and stirred, control pulp density is 0.65, prepares mixed slurry；
(3) mist projection granulating: mixed slurry being put into ball mill and is ground, and is then forced into 1.6Mpa by plunger pump and is entered spray
Mist drying tower, it is 690 DEG C that temperature in spray drying tower, which is arranged, and leaving air temp is 165 DEG C, carries out mist projection granulating；
(4) it sieves dedusting: the bloom middle low carbon steel covering slag through mist projection granulating is separated into 20-80 purpose with Vibration Screen
Bloom middle low carbon steel covering slag；
(5) product testing: generous through detecting this to the bloom middle low carbon steel covering slag sample detection chemical component of preparation
In base middle low carbon steel covering slag: CaO:37.27%, SiO2: 31.49%, MgO:6.19%, Fe2O3: 0.54%, Al2O3: 3.56%,
Na2O:3.02%, F-: 4.37%, B2O3: 1.94%, fixed carbon: 6.37%, basicity: 1.18,1210 DEG C of fusing point, melt speed: 22s, viscosity
0.25Pas, gauging surface tension: 363.4mN/m.
(6) it packs, storage.
The bloom middle low carbon steel covering slag is used in Jiangsu Jiangyin iron and steel enterprise steel-making continuous casting technique, technique ginseng
Number are as follows: steel grade 20Cr, section: 300 × 340, pulling rate is constant: 0.75m/min, cast temperature: 1535 DEG C, which is added
Spreadability is good afterwards, good air permeability, even flame, and liquid slag layer 8-10mm, one is poured time 5 furnace steel without choosing slag item, consumption
0.42Kg/t steel, cc billet surface quality and subcutaneous quality are good, are fully able to meet continuous casting demand.
Embodiment 2
A kind of bloom middle low carbon steel covering slag is prepared: 34 parts of wollastonite, magnesium slag 30 by the raw material of following parts by weight
Part, 3 parts of quartz, 1 part of bentonite, 5 parts of flint clay, 7 parts of fluorite, 1 part of soda ash, 4 parts of boron glass powder, 2 parts of magnesia powder, carbon in 390
4 parts of graphite, 4 parts of high-carbon amorphous graphite, 2 parts of half reinforcement gas black, 2 parts of binder and 0.3 part of sodium lignin sulfonate.
Wherein binder is yellow starch gum；Wollastonite, quartz, bentonite, flint clay, fluorite, soda ash, boron glass Powder Particle Size are equal
For 200 mesh.
The preparation method of above-mentioned bloom middle low carbon steel covering slag, comprising the following steps:
(1) pre-treatment of raw material: magnesium slag is stirred evenly, and dries its water content≤1%, is crushed to 200 mesh >=95% of granularity,
The chemical component of sample detection magnesium slag, through SiO in detection magnesium slag2: 32.11%, CaO:55.02%, MgO:6.77%.
(2) slurrying: after chemical component determines, the formula of bloom middle low carbon steel covering slag is designed, is then claimed by weight
Each raw material are taken, are placed in pulping tank, 60min is added water and stirred, control pulp density is 0.63, prepares mixed slurry；
(3) mist projection granulating: mixed slurry being put into ball mill and is ground, and is then forced into 1.4Mpa by plunger pump and is entered spray
Mist drying tower, it is 720 DEG C that temperature in spray drying tower, which is arranged, and leaving air temp is 170 DEG C, carries out mist projection granulating；
(4) it sieves dedusting: the bloom middle low carbon steel covering slag through mist projection granulating is separated into 20-80 purpose with Vibration Screen
Bloom middle low carbon steel covering slag；
(5) product testing: generous through detecting this to the bloom middle low carbon steel covering slag sample detection chemical component of preparation
In base middle low carbon steel covering slag: CaO:36.14%, SiO2: 35.84%, MgO:3.86%, Fe2O3: 0.53%, Al2O3: 2.71%,
Na2O:1.34%, F-: 3.10%, B2O3: 1.13%, fixed carbon: 9.18%, basicity: 1.00,1280 DEG C of fusing point, melt speed: 30s, viscosity
0.39Pas, gauging surface tension: 347.1mN/m.
(6) it packs, storage.
The bloom middle low carbon steel covering slag is used in Law Firm Suzhou Jiangsu iron and steel enterprise steel-making continuous casting technique, technique ginseng
Number are as follows: steel grade be 45# steel, section: 310 × 360, pulling rate is constant: 0.6m/min, cast temperature: 1528 DEG C, the covering slag be added
Spreadability is good afterwards, good air permeability, even flame, and liquid slag layer 8-10mm, one is poured time 9 furnace steel without choosing slag item, consumption
0.39Kg/t steel, cc billet surface quality and subcutaneous quality are good, are fully able to meet continuous casting demand.
Embodiment 3
A kind of bloom middle low carbon steel covering slag is prepared: 35 parts of wollastonite, magnesium slag 20 by the raw material of following parts by weight
Part, quartzy 6 parts, 5 parts of bentonite, 2 parts of flint clay, 5 parts of fluorite, 2 parts of soda ash, 2 parts of manganese carbonate, 3 parts of boron glass powder, magnesia powder 3
Part, 5 parts of 390 medium-carbon graphite, 6 parts of high-carbon amorphous graphite, 3 parts of half reinforcement gas black, 3 parts of binder and sodium lignin sulfonate
0.3 part.
Wherein binder is yellow starch gum；Wollastonite, quartz, bentonite, flint clay, fluorite, soda ash, manganese carbonate, boron glass
Powder Particle Size is 200 mesh.
The preparation method of above-mentioned bloom middle low carbon steel covering slag, comprising the following steps:
(1) pre-treatment of raw material: magnesium slag is stirred evenly, and dries its water content≤1%, is crushed to 200 mesh >=95% of granularity,
Through SiO in detection magnesium slag2: 33.77%, CaO:53.27%, MgO:7.55%；
(2) slurrying: after chemical component determines, the formula of bloom middle low carbon steel covering slag is designed, is then claimed by weight
Each raw material are taken, are placed in pulping tank, 70min is added water and stirred, control pulp density is 0.60, prepares mixed slurry；
(3) mist projection granulating: mixed slurry being put into ball mill and is ground, and is then forced into 1.2Mpa by plunger pump and is entered spray
Mist drying tower, it is 740 DEG C that temperature in spray drying tower, which is arranged, and leaving air temp is 175 DEG C, carries out mist projection granulating；
(4) it sieves dedusting: the bloom middle low carbon steel covering slag through mist projection granulating is separated into 20-80 purpose with Vibration Screen
Bloom middle low carbon steel covering slag；
(5) product testing: generous through detecting this to the bloom middle low carbon steel covering slag sample detection chemical component of preparation
In base middle low carbon steel covering slag: CaO:30.10%, SiO2: 37.97%, MgO:4.20%, Fe2O3: 0.57%, Al2O3: 2.01%,
Na2O:1.70%, F-: 2.19%, MnO:1.10%, B2O3: 0.84%, fixed carbon: 12.74%, basicity: 0.79, it 1230 DEG C of fusing point, melts
Speed: 41s, viscosity 0.80Pas, gauging surface tension are as follows: 326.8mN/m.
(6) it packs, storage.
The bloom middle low carbon steel covering slag is used in Tangshan iron and steel enterprise steel-making continuous casting technique, technological parameter
Are as follows: steel grade Q420B, section: 250 × 360, pulling rate is constant: 1.0m/min, cast temperature: 1535 DEG C, after which is added
Spreadability is good, good air permeability, even flame, and liquid slag layer 8-10mm, one is poured time 5 furnace steel without choosing slag item, consumption
0.31Kg/t steel, cc billet surface quality and subcutaneous quality are good, are fully able to meet continuous casting demand.
Embodiment 4
A kind of bloom middle low carbon steel covering slag is prepared: 39 parts of wollastonite, magnesium slag 25 by the raw material of following parts by weight
Part, quartzy 4 parts, 3 parts of bentonite, 3 parts of flint clay, 3 parts of fluorite, 3 parts of soda ash, 1 part of manganese carbonate, 4 parts of boron glass powder, magnesia powder 4
Part, 3 parts of 390 medium-carbon graphite, 5 parts of high-carbon amorphous graphite, 1.5 parts of half reinforcement gas black, 1.5 parts of binder and sulfomethylated lignin
0.2 part of sour sodium.
Wherein binder is yellow starch gum；Wollastonite, quartz, bentonite, flint clay, fluorite, soda ash, manganese carbonate, boron glass
Powder Particle Size is 200 mesh.
The preparation method of above-mentioned bloom middle low carbon steel covering slag, comprising the following steps:
(1) pre-treatment of raw material: magnesium slag is stirred evenly, and dries its water content≤1%, is crushed to 200 mesh >=95% of granularity,
Through SiO in detection magnesium slag2: 33.50%, CaO:53.65%, MgO:8.20%；
(2) slurrying: after chemical component determines, the formula of bloom middle low carbon steel covering slag is designed, is then claimed by weight
Each raw material are taken, are placed in pulping tank, 60min is added water and stirred, control pulp density is 0.62, prepares mixed slurry；
(3) mist projection granulating: mixed slurry being put into ball mill and is ground, and is then forced into 1.3Mpa by plunger pump and is entered spray
Mist drying tower, it is 650 DEG C that temperature in spray drying tower, which is arranged, and leaving air temp is 140 DEG C, carries out mist projection granulating；
(4) it sieves dedusting: the bloom middle low carbon steel covering slag through mist projection granulating is separated into 20-80 purpose with Vibration Screen
Bloom middle low carbon steel covering slag, obtains product；
(5) product testing: to the product sample detection chemical component of preparation, the bloom middle low carbon steel covering slag is detected
In: CaO:32.34%, SiO2: 38.22%, MgO:5.64%, Fe2O3: 0.62%, Al2O3: 2.21%, Na2O:2.47%, F-:
1.32%, MnO:0.55%, B2O3: 1.12%, fixed carbon: 8.62%, basicity: 0.85,1260 DEG C of fusing point, melt speed: 28s, viscosity
0.88Pas, gauging surface tension: 348.0mN/m.
(6) it packs, storage.
The bloom middle low carbon steel covering slag is used in Lingyuan iron and steel enterprise steel-making continuous casting technique, technological parameter
Are as follows: steel grade 25MnB, section: 300 × 360, pulling rate is constant: 0.9m/min, cast temperature: 1540 DEG C, after which is added
Spreadability is good, good air permeability, even flame, and liquid slag layer 9-11mm, one is poured time 6 furnace steel without choosing slag item, consumption
0.32Kg/t steel, cc billet surface quality and subcutaneous quality are good, are fully able to meet continuous casting demand.
Embodiment 5
A kind of bloom middle low carbon steel covering slag is prepared: 25 parts of wollastonite, magnesium slag 35 by the raw material of following parts by weight
Part, quartzy 2 parts, 2 parts of bentonite, 5 parts of flint clay, 8 parts of fluorite, 1 part of soda ash, 1.5 parts of manganese carbonate, 6 parts of boron glass powder, magnesia powder
3 parts, 2 parts of 390 medium-carbon graphite, 3 parts of high-carbon amorphous graphite, 2 parts of half reinforcement gas black, 2.5 parts of binder and sulfomethylated lignin
0.4 part of sour sodium.
Wherein binder is yellow starch gum；Wollastonite, quartz, bentonite, flint clay, fluorite, soda ash, manganese carbonate, boron glass
Powder Particle Size is 200 mesh.
The preparation method of above-mentioned bloom middle low carbon steel covering slag, comprising the following steps:
(1) pre-treatment of raw material: magnesium slag is stirred evenly, and dries its water content≤1%, is crushed to 200 mesh >=95% of granularity,
Through SiO in detection magnesium slag2: 32.77%, CaO:55.21%, MgO:6.48%；
(2) slurrying: after chemical component determines, the formula of bloom middle low carbon steel covering slag is designed, is then claimed by weight
Each raw material are taken, are placed in pulping tank, 70min is added water and stirred, control pulp density is 0.65, prepares mixed slurry；
(3) mist projection granulating: mixed slurry being put into ball mill and is ground, and is then forced into 1.4Mpa by plunger pump and is entered spray
Mist drying tower, it is 750 DEG C that temperature in spray drying tower, which is arranged, and leaving air temp is 160 DEG C, carries out mist projection granulating；
(4) it sieves dedusting: the bloom middle low carbon steel covering slag through mist projection granulating is separated into 20-80 purpose with Vibration Screen
Bloom middle low carbon steel covering slag；
(5) product testing: generous through detecting this to the bloom middle low carbon steel covering slag sample detection chemical component of preparation
In base middle low carbon steel covering slag: CaO:36.04%, SiO2: 33.57%, MgO:5.06%, Fe2O3: 0.49%, Al2O3: 3.12%,
Na2O:1.74%, F-: 3.58%, MnO:0.82%, B2O3: 1.71%, fixed carbon: 6.52%, basicity: 1.07, it 1270 DEG C of fusing point, melts
Speed: 23s, viscosity 0.42Pas, gauging surface tension: 354.7mN/m.
(6) it packs, storage.
The bloom middle low carbon steel covering slag is used in Henan iron and steel enterprise steel-making continuous casting technique, technological parameter
Are as follows: steel grade 30MnVS, section: 300 × 370, pulling rate is constant: 0.70m/min, cast temperature: 1535 DEG C, which is added
Spreadability is good afterwards, good air permeability, even flame, and liquid slag layer 8-10mm, one is poured time 4 furnace steel without choosing slag item, consumption
0.41Kg/t steel, cc billet surface quality and subcutaneous quality are good, are fully able to meet continuous casting demand.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, this field is common
Other modifications or equivalent replacement that technical staff makes technical solution of the present invention, without departing from technical solution of the present invention
Spirit and scope, be intended to be within the scope of the claims of the invention.
Claims (7)
1. a kind of bloom middle low carbon steel covering slag, it is characterised in that: prepared by the raw material of following parts by weight: wollastonite 19-
39 parts, 20-40 parts of magnesium slag, 2-6 parts of quartz, 1-5 parts of bentonite, 2-6 parts of flint clay, 3-10 parts of fluorite, 1-3 parts of soda ash, carbonic acid
1-2 parts of manganese, 3-7 parts of boron glass powder, 2-4 parts of magnesia powder, 2-5 parts of 390 medium-carbon graphite, 3-6 parts of high-carbon amorphous graphite, half reinforcement day
Right 1.5-3 parts of micronex, 1.5-3 parts of binder and 0.2-0.4 parts of sodium lignin sulfonate.
2. a kind of bloom middle low carbon steel covering slag according to claim 1, it is characterised in that: the binder is yellow paste
Essence.
3. a kind of bloom middle low carbon steel covering slag according to claim 1, it is characterised in that: the wollastonite, stone
English, bentonite, flint clay, fluorite, soda ash, manganese carbonate, boron glass Powder Particle Size are 200 mesh.
4. a kind of bloom middle low carbon steel covering slag according to claim 1, it is characterised in that: the physics and chemistry of the covering slag
Ingredient are as follows: CaO:30.10-37.27%, SiO2: 31.49-38.22%, MgO:3.86-6.19%, Fe2O3:≤1%, Al2O3: 2.01-
3.56%, Na2O:1.32-3.02%, F-: 1.32-4.37%, B2O3: 0.84-1.94%, MnO:0-1.10%, fixed carbon: 6.37-
12.74%, basicity: 0.79-1.18, melts speed: 22-41s, viscosity 0.25-0.88Pas, surface tension by 1210-1280 DEG C of fusing point
Are as follows: 326.8-363.4mN/m.
5. a kind of preparation method of bloom middle low carbon steel covering slag as described in claim 1, it is characterised in that: including following
Step:
(1) pre-treatment of raw material: magnesium slag being stirred evenly, water content≤1% is dried to, and being crushed to granularity is 200 mesh, wherein sieving
Lower amount of substance accounting >=95%；
(2) slurrying: weighing each raw material by weight, be placed in pulping tank, add water and stir, and control pulp density is 0.60-
0.65, prepare mixed slurry；
(3) mist projection granulating: slurry being put into ball mill and is ground, and then pressurization enters spray drying tower progress mist projection granulating；
(4) it sieves dedusting: screening out the particle for the mist projection granulating that granularity is 20-80 mesh, bloom middle low carbon steel guarantor is prepared
Protect slag；
(5) product testing: to the bloom middle low carbon steel covering slag sample detection chemical component being prepared；
(6) it packs, storage.
6. the preparation method of bloom middle low carbon steel covering slag according to claim 5, it is characterised in that: the step
(2) mixing time >=60min in.
7. the preparation method of bloom middle low carbon steel covering slag according to claim 5, it is characterised in that: the step
(3) in, mixed slurry is pressurized to 1.2-1.6Mpa, 650-750 DEG C of temperature in the tower of spray drying tower, outlet temperature 140-
180℃。
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| CN109732048B (en) * | 2019-03-28 | 2021-05-04 | 西峡龙成冶金材料有限公司 | Covering slag for automobile plate steel continuous casting crystallizer, preparation method and application thereof |
| CN110000352B (en) * | 2019-05-05 | 2021-06-15 | 西峡县西保冶金材料有限公司 | Function protection material for continuous casting crystallizer special for plastic mould steel |
| CN110039020B (en) * | 2019-05-10 | 2021-06-01 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer covering slag special for bloom free-cutting steel, preparation method thereof and bloom free-cutting steel continuous casting method |
| CN110976797B (en) * | 2019-12-25 | 2022-06-07 | 河南通宇冶材集团有限公司 | Micro-carbon covering slag for medium-high carbon steel of square and rectangular billets and preparation method thereof |
| CN113714477A (en) * | 2021-09-09 | 2021-11-30 | 张家口汇德冶金材料有限公司 | Formula and production process of low-carbon covering slag containing titanium stainless steel |
| CN115351252B (en) * | 2022-09-28 | 2024-04-16 | 河南通宇冶材集团有限公司 | Casting slag for reducing slab continuous casting defect and preparation method thereof |
| CN116586576B (en) * | 2023-07-14 | 2023-10-10 | 张家口汇德冶金材料有限公司 | Continuous casting large round billet low-carbon steel covering slag and preparation method thereof |
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Denomination of invention: A protective slag for medium and low carbon steel in large billets and its preparation method Granted publication date: 20190830 Pledgee: Industrial and Commercial Bank of China Limited Xixia Branch Pledgor: HENAN TONGYU METALLURGY MATERIALS GROUP Co.,Ltd.|Henan Xuantong New Material Technology Co.,Ltd. Registration number: Y2024980042610 |