CN113215476A - 一种生产工业纯铁的方法 - Google Patents
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 121
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 120
- 239000002893 slag Substances 0.000 claims abstract description 58
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 29
- 239000001301 oxygen Substances 0.000 claims abstract description 29
- 238000010079 rubber tapping Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 23
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 17
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims abstract description 10
- 229910052786 argon Inorganic materials 0.000 claims abstract description 10
- 238000009749 continuous casting Methods 0.000 claims abstract description 9
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 6
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 239000008188 pellet Substances 0.000 claims abstract description 3
- 238000005266 casting Methods 0.000 claims description 18
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 14
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 14
- 239000004571 lime Substances 0.000 claims description 14
- 238000007664 blowing Methods 0.000 claims description 13
- 229910052717 sulfur Inorganic materials 0.000 claims description 8
- 238000005261 decarburization Methods 0.000 claims description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 4
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 229910052681 coesite Inorganic materials 0.000 claims description 4
- 229910052906 cristobalite Inorganic materials 0.000 claims description 4
- 239000006187 pill Substances 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 229910052682 stishovite Inorganic materials 0.000 claims description 4
- 229910052905 tridymite Inorganic materials 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 claims description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 239000010436 fluorite Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000005275 alloying Methods 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 abstract description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 238000009489 vacuum treatment Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- IXQWNVPHFNLUGD-UHFFFAOYSA-N iron titanium Chemical compound [Ti].[Fe] IXQWNVPHFNLUGD-UHFFFAOYSA-N 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- 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
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/068—Decarburising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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Abstract
一种生产工业纯铁的方法,钢的化学组成重量百分配比为C≤0.01%、Si≤0.04%、Mn≤0.10%,P≤0.015%,S≤0.015%,Al≥0.020%,Ti=0.05~0.10%,Cr≤0.03%,Ni≤0.02%;Cu≤0.04%,余量为Fe以及不可避免的杂质;包括以下生产步骤:转炉‑LF炉‑扒渣‑LF炉‑RH炉‑连铸。本发明转炉采用双渣法冶炼,高温和高碱度出钢,降低终点钢水S含量,转炉出钢和LF炉采用硅铁、钛铁脱除钢水中氧,采用铝丸脱除渣中氧,结合大氩气搅拌,实现钢水快速脱硫。该工艺在不经过铁水预处理脱硫下,不采用铝线脱氧,可大幅减少钢水Al2O3夹杂,改善钢水可浇性。
Description
技术领域
本发明涉及冶金领域钢铁材料,尤其涉及一种采用氧气转炉+炉外精炼工艺生产工业纯铁的方法。
背景技术
工业纯铁是一种重要的钢铁基础材料,一般用于制造电磁元件、软磁材料、高温合金、耐热合金、精密合金、马氏体时效钢等航空航天、军工和民用合金或钢材。目前已有技术冶炼超低碳钢工业纯铁主要有两种工艺:第一种是铁水预处理-转炉吹炼-RH真空处理-连铸工艺;第二种是转炉吹炼-LF精炼-RH真空处理-连铸工艺。第二种工艺在LF进行加铝脱氧造渣脱硫操作,在RH真空处理采用强制脱碳控制钢水中的碳含量,此工艺在RH处理过程中,会导致钢水Al2O3夹杂多,最终影响钢水在浇铸过程中水口絮流,影响钢水质量和生产顺行。
发明内容
为克服上述现有技术的不足,本发明的目的是提供一种生产高纯度工业纯铁的方法,能实现钢水快速脱硫;扒渣可以减少后期钢水返硅返硫;不采用铝线脱氧,可大幅减少钢水中Al2O3夹杂,改善钢水可浇性。
本发明通过以下技术方案实现:
—种生产工业纯铁的方法,钢的化学组成重量百分配比为C≤0.01%、Si≤0.04%、Mn≤0.10%,P≤0.015%,S≤0.015%,Al≥0.020%,Ti=0.05~0.10%,Cr≤0.03%,Ni≤0.02%;Cu≤0.04%,余量为Fe以及不可避免的杂质;包括以下生产步骤:
1)转炉:采用S≤0.030%、Mn≤0.20%、Ni<0.02%、Cu<0.03的铁水和专用废钢,转炉采用双渣法操作,终渣碱度CaO/SiO2≥4.0,出钢温度1640-1660℃,出钢时C=0.03%~0.05%,定氧600~1000ppm,P≤0.012%,S≤0.020%,Mn≤0.06%;出钢采用滑板挡渣,出钢过程加入石灰2.0~3.5kg/t钢、合成渣1~2kg/t钢进行造渣,根据出钢定氧加入硅铁1.5~2.5kg/t钢进行脱氧。
2) LF炉:钢水进站后,采用钛铁脱除钢水中氧,采用铝丸脱除渣中氧,铝丸分多批共加入0.3~0.6kg/t钢;结合大氩气搅拌脱硫,当钢水Si<0.025%,S≤0.008%后,加入石灰2.0~4.0kg/t钢进行稠渣。
3)扒渣:钢水至扒渣工位后,扒渣至钢水裸露面≥90%,扒渣操作完成。
4) LF炉:钢水扒渣后再次进LF炉进行升温造渣操作,加入石灰、预熔渣、铝丸进行造渣,石灰加入量4~6kg/t钢,预熔渣1.5~3.0kg/t钢,萤石0~2.0 kg/t钢,终渣FeO≤2.0%。
5)RH炉:钢水进RH后,采用强制脱碳模式对钢水中碳含量进行控制,待钢水定氧200~300ppm时,脱碳结束,此时钢水C≤0.004%;然后进行循环脱氧和合金化,吹氩流量115-125Nm3/h,加入铝铁0.95~1.15kg/t钢,循环3~4min加入钛铁(Ti含量为70%)1.3~1.5kg/t钢,循环3~4分钟破空;破空后喂入纯钙线200~300m,软吹8~15min,在渣面均匀洒入铝丸30~40kg后上台浇铸。
6)连铸:浇铸过程中采用无碳覆盖剂、无碳保护渣、防止浇铸过程增碳,连铸过程采用全保护浇铸,中包过热度控制在40-60℃。
本发明的有益效果:转炉采用适宜铁水和专用废钢,有效控制钢中Cr、Ni、Cu、Mn等元素含量,采用双渣法冶炼,高温和高碱度出钢,降低终点钢水S含量,转炉出钢和LF炉采用硅铁、钛铁脱除钢水中氧,采用铝丸脱除渣中氧,结合大氩气搅拌,实现钢水快速脱硫。扒渣可以减少后期钢水返硅返硫。该工艺在不经过铁水预处理脱硫下,不采用铝线脱氧,可大幅减少钢水中Al2O3夹杂,改善钢水可浇性。
具体实施方式
下面结合实施例对本发明做进一步描述。
实施例1
—种生产工业纯铁的方法,钢的化学成分如表1,包括以下生产步骤:
1)转炉:选用适宜铁水和专用废钢,入炉铁水成分:S= 0.028%、Mn= 0.17%、Ni=0.01%、Cu= 0.02%,冶炼时采用双渣法操作,终渣碱度CaO/SiO2=4.8,出钢温度1648℃,出钢C=0.042%,定氧752ppm,出钢P= 0.011%,S= 0.017%,Mn =0.06%。出钢采用滑板挡渣,出钢过程加入石灰2.7kg/t钢、合成渣1.3kg/t钢,根据出钢定氧加入硅铁1.8kg/t钢进行脱氧。
2) LF炉:钢水进站后,加入钛铁1.1kg/ t钢脱除钢水中氧,多批少量加入铝丸0.42kg/t钢脱除渣中氧。结合大氩气搅拌脱硫,当钢水Si= 0.018%,S= 0.006%时,加入石灰2.7kg/t钢进行稠渣,然后进行扒渣操作。
3)扒渣:钢水至扒渣工位后,捞渣至钢水裸露面≥90%,扒渣操作完成。
4) LF炉:钢水扒渣后再次进LF炉进行升温造渣操作,加入石灰4.5kg/t钢,预熔渣2.0kg/t钢,萤石1.2 kg/t钢,终渣FeO 1.65%。
5)RH炉:钢水进RH后,采用吹氧脱碳,吹氧结束后循环12min,钢水定氧252ppm时,钢水C 0.002%,设置提升吹氩流量控制在120Nm3/h,加入铝0.105Kg/t钢,循环3min加入钛铁(Ti=70%)1.4kg/t钢,循环4分钟后破空。破空后喂入纯钙线250m,软吹12min,在渣面洒入铝丸35Kg后上台浇铸。
6)连铸:浇铸过程中采用无碳覆盖剂、无碳保护渣、防止浇铸过程增碳,过程采用全保护浇铸,减少钢水增氮和二次氧化,中包过热度控制在51-55℃。浇铸过程结晶器液面控制在±5mm。
实施例2
—种生产工业纯铁的方法,钢的化学成分如表1,包括以下生产步骤:
1)转炉:选用适宜铁水和专用废钢,入炉铁水成分:S =0.025%、Mn= 0.18%、Ni=0.01%、Cu =0.02%,冶炼时采用双渣法操作,终渣碱度CaO/SiO2=5.3,出钢温度1655℃,出钢C=0.032%,定氧902ppm,出钢P= 0.010%,S =0.015%,Mn= 0.05%。出钢采用滑板挡渣,出钢过程加入石灰3.2kg/t钢、合成渣1.5kg/t钢,根据出钢定氧加入硅铁2.2kg/t钢进行脱氧。
2) LF炉:钢水进站后,加入钛铁1.3kg/ t钢脱除钢水中氧,多批少量加入铝丸0.53kg/t钢脱除渣中氧。结合大氩气搅拌脱硫,当钢水Si= 0.013%,S =0.007%时,加入石灰3.2kg/t钢进行稠渣,然后进行扒渣操作。
3)扒渣:钢水至扒渣工位后,捞渣至钢水裸露面≥90%,扒渣操作完成。
4) LF炉:钢水扒渣后再次进LF炉进行升温造渣操作,加入石灰5.2kg/t钢,预熔渣2.8kg/t钢,终渣FeO =1.52%。
5)RH炉:钢水进RH后,采用吹氧脱碳,吹氧结束后循环12min,钢水定氧289ppm时,钢水C= 0.002%,设置提升吹氩流量控制在120Nm3/h,加入铝铁0.110kg/t钢,循环3min加入钛铁(Ti=70%)1.4kg/t钢,循环4分钟后破空。破空后喂入纯钙线220m,软吹10min,在渣面洒入铝丸35kg后上台浇铸。
6)连铸:浇铸过程中采用无碳中包、无碳覆盖剂、无碳保护渣、防止浇铸过程增碳,过程采用全保护浇铸,减少钢水增氮和二次氧化,中包过热度控制在42~46℃。浇铸过程结晶器液面控制在±5mm。
表1 实施例钢的化学成分(wt,%)
Claims (1)
1.一种生产工业纯铁的方法,钢的化学组成重量百分配比为C≤0.01%、Si≤0.04%、Mn≤0.10%,P≤0.015%,S≤0.015%,Al≥0.020%,Ti=0.05~0.10%,Cr≤0.03%,Ni≤0.02%;Cu≤0.04%,余量为Fe以及不可避免的杂质;包括以下生产步骤:
1)转炉:采用S≤0.030%、Mn≤0.20%、Ni<0.02%、Cu<0.03的铁水和专用废钢,转炉采用双渣法操作,终渣碱度CaO/SiO2≥4.0,出钢温度1640-1660℃,出钢时C=0.03%~0.05%,定氧600~1000ppm,P≤0.012%,S≤0.020%,Mn≤0.06%;出钢采用滑板挡渣,出钢过程加入石灰2.0~3.5kg/t钢、合成渣1~2kg/t钢进行造渣,根据出钢定氧加入硅铁1.5~2.5kg/t钢进行脱氧;
2) LF炉:钢水进站后,采用钛铁脱除钢水中氧,采用铝丸脱除渣中氧,铝丸分多批共加入0.3~0.6kg/t钢;结合大氩气搅拌脱硫,当钢水Si<0.025%,S≤0.008%后,加入石灰2.0~4.0kg/t钢进行稠渣;
3)扒渣:钢水至扒渣工位后,扒渣至钢水裸露面≥90%,扒渣操作完成;
4) LF炉:钢水扒渣后再次进LF炉进行升温造渣操作,加入石灰、预熔渣、铝丸进行造渣,石灰加入量4~6kg/t钢,预熔渣1.5~3.0kg/t钢,萤石0~2.0 kg/t钢,终渣FeO≤2.0%;
5)RH炉:钢水进RH后,采用强制脱碳模式对钢水中碳含量进行控制,待钢水定氧200~300ppm时,脱碳结束,此时钢水C≤0.004%;然后进行循环脱氧和合金化,吹氩流量115-125Nm3/h,加入铝铁0.95~1.15kg/t钢,循环3~4min加入钛铁(Ti含量为70%)1.3~1.5kg/t钢,循环3~4分钟破空;破空后喂入纯钙线200~300m,软吹8~15min,在渣面均匀洒入铝丸30~40kg后上台浇铸;
6)连铸:浇铸过程中采用无碳覆盖剂、无碳保护渣、防止浇铸过程增碳,连铸过程采用全保护浇铸,中包过热度控制在40-60℃。
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