CN102719724A - Method for improving and stabilizing boron yield in smelting boron-containing steel - Google Patents
Method for improving and stabilizing boron yield in smelting boron-containing steel Download PDFInfo
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- CN102719724A CN102719724A CN201110077857XA CN201110077857A CN102719724A CN 102719724 A CN102719724 A CN 102719724A CN 201110077857X A CN201110077857X A CN 201110077857XA CN 201110077857 A CN201110077857 A CN 201110077857A CN 102719724 A CN102719724 A CN 102719724A
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- 229910052796 boron Inorganic materials 0.000 title claims abstract description 139
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 title claims abstract description 126
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 99
- 239000010959 steel Substances 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000003723 Smelting Methods 0.000 title abstract description 35
- 230000000087 stabilizing effect Effects 0.000 title abstract 2
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 27
- 238000007670 refining Methods 0.000 claims abstract description 21
- 239000002893 slag Substances 0.000 claims abstract description 14
- 239000012159 carrier gas Substances 0.000 claims abstract description 11
- 238000009749 continuous casting Methods 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 33
- 239000007921 spray Substances 0.000 claims description 4
- 241001062472 Stokellia anisodon Species 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 32
- 239000000843 powder Substances 0.000 abstract description 22
- 238000005266 casting Methods 0.000 abstract description 4
- 238000005553 drilling Methods 0.000 abstract 1
- 239000011261 inert gas Substances 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 16
- 238000007664 blowing Methods 0.000 description 16
- 238000005516 engineering process Methods 0.000 description 14
- 239000010936 titanium Substances 0.000 description 13
- 238000011084 recovery Methods 0.000 description 9
- 229910052786 argon Inorganic materials 0.000 description 8
- 238000006392 deoxygenation reaction Methods 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 239000003643 water by type Substances 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910000712 Boron steel Inorganic materials 0.000 description 4
- 238000005275 alloying Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 229910052726 zirconium Inorganic materials 0.000 description 4
- 229910000640 Fe alloy Inorganic materials 0.000 description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy 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
- 238000004458 analytical method Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 229910000521 B alloy Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910000922 High-strength low-alloy steel Inorganic materials 0.000 description 1
- 229910001199 N alloy Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000009847 ladle furnace Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention provides a method for improving and stabilizing boron yield in smelting boron-containing steel, which adopts a converter-LF furnace-continuous casting production process and is characterized in that FeO + MnO in slag is less than or equal to 1.5%, T [ O ] is less than or equal to 0.0030% and N is less than or equal to 0.0040% after refining of the LF furnace; the continuous casting adopts full-process protective casting, and when molten steel is injected into a tundish, the boron-containing powder is sprayed into the molten steel by using inert gas Ar as carrier gas in a manner of drilling a long nozzle of the ladle. The method does not need VD furnace treatment and Ti addition for nitrogen fixation treatment, has low production cost and simple operation process, and the boron-containing steel produced by the method has the boron yield of 70-90 percent and the difference of the boron yield among the tanks is less than 0.0003 percent, which is far higher than that of the traditional boron-containing steel smelting method.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, particularly a kind of method that improves and stablize boron yield when smelting boron-containing steel.
Background technology
In the alloying element of in high-strength low alloy steel, being paid close attention to, it is more special a kind of that boron is considered to.Can improve hardening capacity on the basis of the inherent assurance of addition 0.001%~0.003% scope of boron matrix; And its hardening capacity is not second to containing 0.6%Mn; 0.7%Cr, the steel grade of 0.5%Mo and 1.5%Ni, therefore; The hundred times that its ability that improves hardening capacity is above-mentioned alloying element and even thousands of times are so only need minute quantity boron can practice thrift a large amount of valuable alloying elements.The effect that general alloying element improves hardening capacity increases with its content in steel; But boron has an optimum content (scope), and is too much or very few all unfavorable to improving hardening capacity, and this amount is very little; Be about 0.0010%, generally be controlled at 0.0005%~0.0030%.
Because the chemical property of boron is very active; Be easy to steel in oxygen, nitrogen combine; Make boron ineffective, and the boron content in the steel is few again, so how to guarantee in the smelting of boron steel stably to obtain that an amount of acid dissolves boron and be evenly distributed in the steel is very important.The technology of tradition smelting boron steel: converter-LF stove-continuous casting or converter-LF stove-VD stove-continuous casting; In the steel-making later stage (LF stove or VD stove); Through adding the abundant deoxidation of aluminium, add the abundant fixed nitrogen of iron alloy such as titanium, zirconium, add ferro-boron afterwards again; The adding mode of boron has two kinds: the one, add with the ferro-boron form, and another kind is to add with the cored-wire form.Traditional smelting process is very strict to each processing requirement, and the distribution in steel of the yield of boron, boron is also unstable.Be different from above-mentioned traditional smelting technology method, Chinese patent 200810015497.9 has been reported before the molten steel vacuum-treat and carry out boron alloyization, the vacuum-treat post analysis, and the boron recovery is more than 90%, and the boron content deviation is less than 0.0002% between each stove.Though this technology can be stabilized and increased the yield of boron, slag composition has been carried out strict restriction: (%FeO)+(%MnO)<1.50%, (%Si0
2)<15.00% in addition, consumes iron alloys such as a large amount of titaniums, zirconium equally, to reduce oxygen, the nitrogen content in the molten steel, prevents the boron over oxidation.Chinese patent 200410050358.1 has reported with the boracic molten iron to be the method for the direct smelting boron steel of raw material, and the boracic molten iron is to adopt blast furnace to separate paigeite to extract B
2O
3The time a kind of natural boracic metallic product that obtains.But, because silicon and sulphur content are very high in the boracic molten iron, be respectively 2.0%~2.5% and 0.06%~0.1%, so the quantity of slag that causes producing in the steelmaking process is big, make the production cost increase, in addition, boron is with B
2O
3Form exists, and in steelmaking process, will float and to slag, remove, and has reduced the yield of boron.Relevant document has been introduced the recovery situation of smelting boron-containing steel boron: in the Chinese patent 200710049005.3, can make the recovery of boron reach 69.4%~91.8% in the method for the converter smelting boron-containing steel of introduction.Introduced in 2009 the 1st phases of document " casting " " analysis of Influential Factors of the r recovery in the High Boron Steel " and adopted two kinds of technologies to smelt boron-containing steel: vacuum and antivacuum processing; The boron yield is 78%~96.7%, but need add the recovery that alloys such as Ti, Zr and rare earth are stablized boron simultaneously.Introduce the application traditional technology in 1992 the 5th phases of document " special steel " " metallurgy factor is to the influence of the B recovery in the boron steel " and smelted boron-containing steel; Adopt the alloy of deoxidation fixed nitrogen to add mode; Its optimum content should be controlled at Al:0.02%~0.05%; Ti:0.03%~0.05%, addition sequence are Al-Ti-B, and this kind technology can make the recovery of boron reach 10%~65%.Be employed in LF stove refining later stage feeding B heart yearn mode in 1997 the 2nd phases of document " special steel " " Application and Development of 60t ladle furnace line feeding technology " and add boron, can make the boron recovery reach 85%.Though adopt the line feeding mode can improve the recovery of boron in steel, relatively stricter to the specification of quality of cored-wire, its cost is also bigger equally.
Therefore it is very important how when reducing iron alloy deoxidation fixed nitrogen such as aluminium, titanium, zirconium, calcium, guaranteeing stably to obtain the molten boron of an amount of acid in smelting again and being evenly distributed in the steel.Like this, not only improved the yield of boron but also can reduce production costs.
Summary of the invention
It is not enough to the objective of the invention is to overcome above-mentioned existing in prior technology, provides a kind of and can reduce the consumption of deoxidation fixed nitrogen alloy and reduce the boron-containing steel smelting cost, the method for raising and stable boron yield.
The operational path that the present invention adopts is: converter-LF stove-continuous casting, need be through vacuum-treat, and concrete process step is following:
1) smelting molten steel: adopt converter and LF stove smelting molten steel; Deoxidation of molten steel technology all adopts known smelting technology, uses the most frequently used Al, Ca, Si etc. and gets final product as reductor, need not add the Ti alloy and carry out the fixed nitrogen processing; After the refining of LF stove finishes; Guarantee (FeO+MnO)≤1.5% in the slag, T [O]≤0.0030%, N≤0.0040%.
2) molten steel after refining finishes is transported to continuous casting, adopts the whole process protection casting, and when molten steel injected tundish, the mode of holing through ladle long nozzle was that carrier gas sprays into the boracic pulvis in the molten steel with rare gas element Ar gas.
Boracic pulvis of the present invention is B
4C or B
4C+Fe-B or B
4C+B, its granularity is 500~50 μ m, surpasses yield and stability that this scope will influence boron, also is prone to cause the line clogging phenomenon, its winding-up amount is decided according to the boron-containing quantity of steel grade; The jetting pressure of said Ar gas is 0.35~0.40Mpa, and gas flow is 1.5~2.0m
3/ h, the winding-up time is the pouring time of every jar of molten steel; Said ladle long nozzle bore position is 200~300mm apart from the long nozzle upper end, and the quantity in hole is 1, and the axial and long nozzle in hole axially is 10~45 ° of angles, is connected with source of the gas with powder spraying apparatus through metallic hose.The conveying of pulvis of the present invention is not limited to this kind mode, also can adopt modes such as spray gun conveying.
The present invention sprays into the boracic pulvis in the tundish molten steel in every jar of molten steel casting, mainly is to utilize the stirring of molten steel here to make the fully contact with it of boracic pulvis, makes homogenization of composition, helps improving the stability and the yield of boron.
The present invention only adopts converter-LF stove-continuous casting smelting technology route, handles without the VD stove, need not add Ti simultaneously and carry out the fixed nitrogen processing, can practice thrift the mass production cost like this.The boron-containing steel that adopts the present invention to produce, boron has advantages of higher stability and yield, and the boron yield is 70%~90%; The boron yield differs less than 0.0003% between each jar time, and present method or all will be far superior to traditional boron smelting technology method no matter from production cost on boron yield and the stability; And raw material is prone to produce; Price is low, and operating procedure is simple, has good application prospects.
Embodiment
Through embodiment the present invention is done further description below.
Embodiment 1
The smelting boron-containing quantity is 0.0005%~0.0030% steel for engineering mechanism purpose, originally waters the inferior 4 jars of boron-containing steels of producing altogether, uses present method to carry out boron alloyization and control boron content.
Molten steel need not add metal Ti and carry out fixed nitrogen processing, T [O]=0.0025%, N≤0.0035%, (FeO+MnO)=1.2% in the slag behind converter, LF stove deoxygenation refining.
Molten steel is transported to tundish and casts after the refining, selects single pulvis B for use
4(purity: 95.2%) as blowing powder, powder granularity 300 μ m, argon gas are as carrier gas, blowing gas pressure 0.35Mpa, gas flow 1.5m for C
3/ h, B
4C pulvis add-on 2.8kg, smelting molten steel weight 102t, molten steel boron content 0.0004% before the winding-up, winding-up back boron content 0.0022%, through calculating boron yield 84.1%, all the other 3 jars of steel boron yields are respectively 81.7%, 86.2% and 85.6%.
Single B jets
4The C pulvis is compared with former technology (adopting the Fe-B alloy form), and 1~2 yuan/village steel can save production cost.And do not need also can practice thrift the large number quipments running expense through vacuum-treat.
Embodiment 2
The smelting boron-containing quantity is 0.0005%~0.0030% steel for engineering mechanism purpose, originally waters the inferior 3 jars of boron-containing steels of producing altogether, uses present method to carry out boron alloyization and control boron content.
Molten steel need not add metal Ti and carry out fixed nitrogen processing, T [O]=0.0028%, N≤0.0037%, (FeO+MnO)=1.38% in the slag behind converter, LF stove deoxygenation refining.
Molten steel is transported to tundish and casts after the refining, selects single pulvis B for use
4(purity: 95.2%) as blowing powder, powder granularity 200 μ m, argon gas are as carrier gas, blowing gas pressure 0.38Mpa, gas flow 1.7m for C
3/ h, B
4C pulvis add-on 2.5kg, smelting molten steel weight 98t, molten steel boron content 0.0004% before the winding-up, winding-up back boron content 0.0021%, through calculating boron yield 85.4%, all the other 2 jars of steel boron yields are respectively 86.8% and 82.6%.
Embodiment 3
The smelting boron-containing quantity is 0.0005%~0.0030% steel for engineering mechanism purpose, originally waters the inferior 3 jars of boron-containing steels of producing altogether, uses present method to carry out boron alloyization and control boron content.
Molten steel need not add metal Ti and carry out fixed nitrogen processing, T [O]=0.0022%, N≤0.0033%, (FeO+MnO)=1.42% in the slag behind converter, LF stove deoxygenation refining.
Molten steel is transported to tundish and casts after the refining, selects single pulvis B for use
4(purity: 95.2%) as blowing powder, powder granularity 100 μ m, argon gas are as carrier gas, blowing gas pressure 0.40Mpa, gas flow 2.0m for C
3/ h, B
4C pulvis add-on 2.5kg, smelting molten steel weight 100t, molten steel boron content 0.0004% before the winding-up, winding-up back boron content 0.0023%, through calculating boron yield 87.7%, all the other 2 jars of steel boron yields are respectively 84.8% and 86.6%.
Embodiment 4
The smelting boron-containing quantity is 0.0005%~0.0030% steel for engineering mechanism purpose, originally waters the inferior 3 jars of boron-containing steels of producing altogether, uses present method to carry out boron alloyization and control boron content.
Molten steel need not add metal Ti and carry out fixed nitrogen processing, T [O]=0.0020%, N≤0.0037%, (FeO+MnO)=1.22% in the slag behind converter, LF stove deoxygenation refining.
Molten steel is transported to tundish and casts after the refining, selects B for use
4C+Fe-B (weight percent: B
4C:50%, Fe-B:50%) (B
4C purity: 95.2%, B content among the Fe-B: 18.5%) as blowing powder, powder granularity 100 μ m, argon gas are as carrier gas, blowing gas pressure 0.35Mpa, gas flow 1.8m
3/ h, pulvis add-on 5.2kg, smelting molten steel weight 105t, molten steel boron content 0.0003% before the winding-up, winding-up back boron content 0.0020%, through calculating boron yield 73.4%, all the other 2 jars of steel boron yields are respectively 70.6% and 72.4%.
Embodiment 5
The smelting boron-containing quantity is 0.0005%~0.0030% steel for engineering mechanism purpose, originally waters the inferior 3 jars of boron-containing steels of producing altogether, uses present method to carry out boron alloyization and control boron content.
Molten steel need not add metal Ti and carry out fixed nitrogen processing, T [O]=0.0022%, N≤0.0034%, (FeO+MnO)=1.14% in the slag behind converter, LF stove deoxygenation refining.
Molten steel is transported to tundish and casts after the refining, selects B for use
4C+Fe-B (weight percent: B
4C:55%, Fe-B:45%) (B
4C purity: 95.2%, B content among the Fe-B: 18.5%) as blowing powder, powder granularity 75 μ m, argon gas are as carrier gas, blowing gas pressure 0.38Mpa, gas flow 1.8m
3/ h, pulvis add-on 5.6kg, smelting molten steel weight 104t, molten steel boron content 0.0004% before the winding-up, winding-up back boron content 0.0024%, through calculating boron yield 79.4%, all the other 2 jars of steel boron yields are respectively 77.6% and 76.4%.
Embodiment 6
The smelting boron-containing quantity is 0.0005%~0.0030% steel for engineering mechanism purpose, originally waters the inferior 3 jars of boron-containing steels of producing altogether, uses present method to carry out boron alloyization and control boron content.
Molten steel need not add metal Ti and carry out fixed nitrogen processing, T [O]=0.0028%, N≤0.0039%, (FeO+MnO)=1.446% in the slag behind converter, LF stove deoxygenation refining.
Molten steel is transported to tundish and casts after the refining, selects B for use
4C+Fe-B (weight percent: B
4C:53%, Fe-B:47%) (B
4C purity: 95.2%, B content among the Fe-B: 18.5%) as blowing powder, powder granularity 75 μ m, argon gas are as carrier gas, blowing gas pressure 0.40Mpa, gas flow 2.0m
3/ h, pulvis add-on 5.5kg, smelting molten steel weight 101t, molten steel boron content 0.0004% before the winding-up, winding-up back boron content 0.0022%, through calculating boron yield 69.4%, all the other 2 jars of steel boron yields are respectively 70.8% and 72.7%.
Embodiment 7
The smelting boron-containing quantity is 0.0005%~0.0030% steel for engineering mechanism purpose, originally waters the inferior 3 jars of boron-containing steels of producing altogether, uses present method to carry out boron alloyization and control boron content.
Molten steel need not add metal Ti and carry out fixed nitrogen processing, T [O]=0.0026%, N≤0.0033%, (FeO+MnO)=1.42% in the slag behind converter, LF stove deoxygenation refining.
Molten steel is transported to tundish and casts after the refining, selects B for use
4C+B (weight percent: B
4C:50%, B:50%) (B
4C purity: 95.2%, B purity: 99.5%) compound powder is as blowing powder, and powder granularity 75 μ m, argon gas are as carrier gas, blowing gas pressure 0.35Mpa, gas flow 1.8m
3/ h, compound powder add-on 3.3kg, smelting molten steel weight 102t, molten steel boron content 0.0004% before the winding-up, winding-up back boron content 0.0024%, through calculating boron yield 71.4%, all the other 2 jars of steel boron yields are respectively 74.5% and 70.7%.
Embodiment 8
The smelting boron-containing quantity is 0.0005%~0.0030% steel for engineering mechanism purpose, originally waters the inferior 3 jars of boron-containing steels of producing altogether, uses present method to carry out boron alloyization and control boron content.
Molten steel need not add metal Ti and carry out fixed nitrogen processing, T [O]=0.0025%, N≤0.0035%, (FeO+MnO)=1.41% in the slag behind converter, LF stove deoxygenation refining.
Molten steel is transported to tundish and casts after the refining, selects B for use
4C+B (weight percent: B
4C:52%, B:48%) (B
4C purity: 95.2%, B purity: 99.5%) compound powder is as blowing powder, and powder granularity 75 μ m, argon gas are as carrier gas, blowing gas pressure 0.40Mpa, gas flow 2.0m
3/ h, compound powder add-on 2.5kg, smelting molten steel weight 103t, molten steel boron content 0.0004% before the winding-up, winding-up back boron content 0.0023%, through calculating boron yield 81.4%, all the other 2 jars of steel boron yields are respectively 84.3% and 80.9%.
Claims (4)
1. smelt the method that boron-containing steel improves and stablize the boron yield for one kind, adopt converter-LF stove-continuous casting production process, it is characterized in that the refining of LF stove finishes after, (FeO+MnO)≤1.5% in the slag, T [O]≤0.0030%, N≤0.0040%; When molten steel injected tundish, the mode of holing through ladle long nozzle was that carrier gas sprays into the boracic pulvis in the molten steel with rare gas element Ar gas, and above per-cent all is weight percentage.
2. the method for raising according to claim 1 and stable boron yield is characterized in that described boracic pulvis is B
4C or B
4C+Fe-B or B
4C+B, its granularity is 500~50 μ m, its winding-up amount is decided according to the boron-containing quantity of steel grade.
3. the method for raising according to claim 1 and stable boron yield, the jetting pressure that it is characterized in that said Ar gas is 0.35~0.40Mpa, gas flow is 1.5~2.0m
3/ h, the winding-up time is the pouring time of every jar of molten steel.
4. the method for raising according to claim 1 and stable boron yield, it is characterized in that said tundish long nozzle bore position apart from long nozzle upper end 200~300mm, the hole axially and long nozzle axially be 10~45 ° of angles.
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Cited By (5)
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CN102994700A (en) * | 2012-11-28 | 2013-03-27 | 武钢集团昆明钢铁股份有限公司 | Smelting method for stably increasing content of boron in boron-containing steel |
CN107287490A (en) * | 2017-06-28 | 2017-10-24 | 江苏省沙钢钢铁研究院有限公司 | Boron-containing steel smelting process method for improving boron yield |
CN107586917A (en) * | 2017-08-11 | 2018-01-16 | 舞阳钢铁有限责任公司 | Improve the smelting process of the molten boron ratio of acid in low-carbon quenching and tempering, high |
CN108588541A (en) * | 2018-03-09 | 2018-09-28 | 江苏省沙钢钢铁研究院有限公司 | Low-nitrogen boron-containing steel smelting method for improving boron element yield |
CN109234607A (en) * | 2018-10-26 | 2019-01-18 | 山东钢铁集团日照有限公司 | A kind of wide plate base production method improving the molten boron content of acid |
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CN101045948A (en) * | 2007-04-29 | 2007-10-03 | 攀钢集团攀枝花钢铁研究院 | Method for producing boron steel by smelting in converter |
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