CN104451385B - A kind of low-carbon (LC), low nitrogen, hyperoxia ingot iron and its production method - Google Patents

A kind of low-carbon (LC), low nitrogen, hyperoxia ingot iron and its production method Download PDF

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Publication number
CN104451385B
CN104451385B CN201410742337.XA CN201410742337A CN104451385B CN 104451385 B CN104451385 B CN 104451385B CN 201410742337 A CN201410742337 A CN 201410742337A CN 104451385 B CN104451385 B CN 104451385B
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low
carbon
techniques
steel
ingot iron
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CN104451385A (en
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严晓红
李建新
赵成志
庞学东
王瑞
孙勇
翟羽佳
李忠伟
于丹
贾翰
谷强
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FUSHUN SPECIAL STEEL SHARES Co Ltd
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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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • 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
    • 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
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The present invention discloses a kind of low-carbon (LC), low nitrogen, hyperoxia ingot iron and its production method, designs ingot iron new varieties, is produced using existing EAF+LF+VOD+VHD smelting processes equipment；LF stoves tapping C >=0.25%, due to desired low-carbon (LC) ingot iron carbon content≤0.09%, it is not Ultra-low carbon ingot iron, do not exist over-blowing phenomenon during VOD vacuum oxygens, the factor of time S in steel is reduced, [C] reacts with [O] in making molten steel using VOD vacuum oxygen methods, reduce [N] content in steel, follow-up VHD stoves production need not carry out strong deoxidation, you can production hyperoxia, the ingot iron of low nitrogen.The beneficial effects of the invention are as follows：The ingot iron new varieties dispensing of design is applied to the super-high strength steel steel grades such as the steel of vaccum sensitive stove production low-carbon (LC) super-high strength steel 9310, is shortened the heat while clarity is improved, improves efficiency；Can production ingot iron new varieties, reduces cost using existing smelting equipment.

Description

A kind of low-carbon (LC), low nitrogen, hyperoxia ingot iron and its production method
Technical field
This bright low-carbon (LC), low-gas content steel dispensing for being related to produce clarity high for vaccum sensitive stove, more particularly to Ingot iron, the invention further relates to the production method of the ingot iron of the clarity high.
Background technology
The current standard iron content of China's ingot iron is carbon containing≤less than 0.04% >=99.5%, other elements it is more low more It is good.;Pangang Group Steel Vanadium ＆ Titanium Co., Ltd. is converted into molten steel, ladle refining, vacuum outgas using water is smelted iron at the beginning of converter Method produce a kind of ingot iron, it is mainly characterized by chemical component weight percentage composition and is：C≤：0.03%, patent is public The number of opening：CN101948980A；Baoshan Iron ＆ Steel Co., Ltd produces a kind of ultra-low carbon high-purity using the method for electric furnace+AOD Ingot iron, its chemical element for being mainly characterized by including following weight percent proportioning：C≤0.008%, Si≤0.05%, Mn ≤ 0.05%, S≤0.002%, P≤0.005%, Al≤0.055% patent publication No. CN101353753；Iron and Steel Research Geueral Inst, Its production uses adopting non-vacuum process, and it is a kind of to pre-process-bessemerize-LF refining-billet continuous casting production procedure production using molten iron Amorphous low manganese, low-sulfur raw material pure iron, the pure iron as raw material are characterised by that its percentage by weight composition is：C：0.03-0.07%, Si：0.10-2.0%, Mn：0.03-0.06%, P：≤ 0.02%, S：≤ 0.005%, Al：≤ 0.02%, Sn≤0.008%, Ti≤0.01%.Patent publication No. CN101041878；Above-mentioned Ultra-low carbon ingot iron is used for the smelting of ultra-low-carbon steel, low manganese, low Sulfur feedstock pure iron sulphur, phosphorus content are high, are not required for gas content.Above-mentioned standard ingot iron and patent ingot iron The common feature of chemical composition is that phosphorus content is low, S contents are high, and gas nitrogen content is high, is not suitable for vaccum sensitive stove production 9310 The low production of the class such as steel super-high strength steel requirement S, O, N content.
External vaccum sensitive stove produces the class super-high strength steels such as 9310 steel, generally uses this steel grade or similar steel grade returns to steel life Produce, gas content is relatively low.With the development of ultra pure alloy, it is desired to which the element sum such as O, N, S, P content is controlled 70 in alloy ×10-6Below or lower level, the special smelting such as existing raw material and vaccum sensitive stove equipment can not fully meet needs Will.Propose both at home and abroad at present by the way of air-breather, dusting device and extraordinary stirring coil is installed additional in vaccum sensitive stove Solve the problems, such as associated materials melting clarity, and using vacuum induction, Cold Crucible Melting, electromagnetic levitation-melt, zone-refine, Ultra pure iron prepared by the technologies such as solid electromigration, production cost is high, it is impossible to used for vaccum sensitive stove dispensing.
Current clarity aircraft engine gear high and the axle class kinds such as the steel of super-high strength steel 9310, low-carbon (LC), gas will Ask content low, [O]≤15 × 10-6、[N]≤25×10-6.Producing such steel using vaccum sensitive stove can only be by the carbon in steel Oxygen reaction, reinforcement stirring reach the purpose of denitrogenation, because actual dispensing uses above-mentioned ingot iron and alloy material, oxygen content Low, nitrogen content is high, and such steel carbon content is relatively low, and reaction between carbon and oxygen is restricted, oxygen, nitrogen control difficulty when vaccum sensitive stove is produced Greatly, cause that the duration of heat is long, efficiency is low, increase production cost.Therefore a kind of special ingot iron is researched and developed for super-high strength steel The production of the vaccum sensitive stove of the kinds such as 9310 steel, improve steel clarity while shorten the heat, improve efficiency into It is the task of top priority.
The content of the invention
The present invention discloses a kind of low-carbon (LC), low nitrogen, hyperoxia ingot iron, it is therefore an objective to meet dispensing requirements by Composition Control.
The present invention discloses a kind of low-carbon (LC), low nitrogen, the production method of hyperoxia ingot iron, it is therefore an objective to utilize existing smelting equipment Produced.
The thinking of the present invention program is：Design a kind of ingot iron new varieties, produce this special using existing equipment Ingot iron, improves oxygen content, reduces nitrogen content raising ingot iron clarity, vaccum sensitive stove is used this industry Pure iron new varieties dispensing produces low-carbon (LC) super-high strength steel, is shortened the heat while clarity is improved, improves efficiency.
The technical scheme that first purpose of the present invention is realized：Design a kind of clarity high, low-carbon (LC), hyperoxia, low nitrogen technical pure Iron new varieties：
(1) chemical composition（%）：
C≤0.09, Si：0.15~0.20, Mn≤0.35, S≤0.001, P≤0.006, do not limit Ni, Cr, and Al≤ 0.030, Ti≤0.015, remaining is Fe, [O] >=0.0040,
[N]≤0.0040；
(2) clarity index（%）：S≤0.001, P≤0.006, Al≤0.030, Ti≤0.015.
The technical scheme that second object of the present invention is realized：A kind of low-carbon (LC), hyperoxia, low nitrogen technical pure
Iron production method, comprises the following steps that：
Using oxidizing process smelting process, EAF+LF+VOD+VHD smeltings are carried out by mentioned component, refining rear mold forms steel ingot；
1. eaf process：
Dispensing：Steel scrap, other be the pig iron or return steel composition.
Tapping condition：C >=0.04%, P≤0.003%, temperature >=1630 DEG C；
2. LF techniques：
LF feeds Al by 0.05% in place, using carborundum, Al powder deoxidations, makes white slag, and C >=0.25%, S≤0.002% is tapped, Opening temperature is：1650 DEG C~1680 DEG C；
3. VOD techniques：
In place, oxygen blast after thermometric adds slag charge to VOD after stopping oxygen thermometric, and vacuum outgas adds AL2.0 kg/t~4.0kg/t, very Reciprocal of duty cycle≤100Pa keeps 10min, when S≤0.001% directly hangs out cast, LF production treatment S is entered when S >=0.001%.
4. VHD techniques：
T >=1620 DEG C are heated to, desulfurization is carried out depending on the appropriate addition Al powder of Si amounts, poured until being hung out after S≤0.001% Note.
5. pour into a mould：Using argon for protecting pouring.
Thinking of the present invention and innovative point：(1) equipped using existing EAF+LF+VOD+VHD smelting processes, LF stoves tapping C >=0.25%, it is not Ultra-low carbon ingot iron, during VOD vacuum oxygens due to desired low-carbon (LC) ingot iron carbon content≤0.09% In the absence of over-blowing phenomenon, the factor of time S in steel is reduced, [C] occurs instead with [O] in making molten steel using VOD vacuum oxygen methods Should, [N] content in steel is reduced, follow-up VHD stoves production need not carry out strong deoxidation, you can production hyperoxia, the ingot iron of low nitrogen. (2) during vacuum induction furnace smelting, carbon have very strong deoxidizing capacity, pressure in vacuum tank during smelting in≤5Pa, carbon Deoxidizing capacity has exceeded many strong deoxidant elements, and the oxygen content in molten steel is increased by hyperoxia ingot iron, makes molten steel in vacuum It is lower to produce strong carbon boil, denitrogenation speed can be accelerated, make denitrogenation and deoxidation while carrying out.
The beneficial effects of the invention are as follows：The ingot iron new varieties dispensing of design is applied to vaccum sensitive stove production low-carbon (LC) and surpasses The super-high strength steel steel grades such as the steel of high-strength steel 9310, shorten the heat while clarity is improved, improve efficiency；Using existing smelting Refining equipment can production ingot iron new varieties, reduces cost.
Specific embodiment
Embodiment 1~3
(1) three stoves clarity microalloy ingot iron high, the actual controlled level of chemical composition such as table 1 are produced；
The % of table 1
Heat (batch) number C Mn Si S P Ni
13209122134 0.063 0.03 0.22 0.001 0.0042 0.08
13209122145 0.057 0.04 0.15 0.001 0.004 0.12
13209101113 0.055 0.05 0.15 0.001 0.004 0.1
Standard requirement ≤0.09 ≤0.35 0.15~0.25 ≤0.001 ≤0.006 —
Table 1 continues %
Heat (batch) number Cr Al Ti O N
13209122134 0.11 0.01 ≤0.010
13209122145 0.33 0.01 ≤0.010
13209101113 0.27 0.03 ≤0.010
Standard requirement — ≤0.03 ≤0.015
(2) process route：EAF+LF+VOD+LF → breaking down cogging → vaccum sensitive stove production.
(3) process for making：
Embodiment 1
Heat (batch) number：13209122134
1. eaf process：
Dispensing：15 tons of steel scrap, 16.7 tons of the pig iron, 31.7 tons of total batch；
Tapping：C：0.05%、P：0.003%, 1672 DEG C of temperature；
2. LF techniques：
LF feeds Al by 0.05% in place, using SiC, AL powder deoxidation, keeps white slag, C：0.35%, S：0.001% tapping, goes out Tank temperature is：1670℃；
3. VOD techniques
In place, vacuum oxygen after thermometric, vacuum outgas adds AL30kg, Si-Ca80kg, vacuum:1mbar, holding 10min, sampling analysis C：0.017% 、Si：0.225%、S：0.0015%；
4. VHD techniques
1630 DEG C, plus Al 10kg are heated in place, and tap S：0.001%；
5. argon for protecting pouring, cast Φ 430, the electrode bars of Φ 450 are used.
Embodiment 2
Heat (batch) number：13209122145
1. eaf process：
Dispensing：15 tons of steel scrap, 19.1 tons of the pig iron, 34.1 tons of total batch；
Tapping：C：0.03%、P：0.0023%, 1660 DEG C of temperature；
2. LF techniques：
LF feeds Al by 0.05% in place, using SiC, AL powder deoxidation, keeps white slag, C：0.465% S：0.001% tapping, goes out Tank temperature is：1680℃；
3. VOD techniques
In place, vacuum oxygen after thermometric, vacuum outgas adds AL30kg, Si-Ca110kg, vacuum:1mbar, holding 10min, sampling analysis C：0.027% 、Si：0.18%、S：0.001%；
4. VHD techniques
1623 DEG C, plus Si-Ca 8kg are heated in place, and tap S：0.001%；
5. argon for protecting pouring, cast Φ 430, the electrode bars of Φ 450 are used.
Embodiment 3
Heat (batch) number：13209101113
1. eaf process：
Dispensing：15 tons of steel scrap, 19.1 tons of the pig iron, 34.1 tons of total batch；
Tapping：C：0.05%、P：0.002%, 1681 DEG C of temperature；
2. LF techniques：
LF feeds Al by 0.05% in place, using SiC, AL powder deoxidation, keeps white slag, C：0.28% S：0.002% tapping, goes out Tank temperature is：1678℃；
3. VOD techniques
In place, vacuum oxygen after thermometric, vacuum outgas adds AL100kg, Si-Ca50kg, vacuum:1mbar keeps 10min, sampling analysis C：0.012% 、Si：0.11%、S：0.0017%；
4. VHD techniques
1618 DEG C, plus 10Kg, Si-Ca 30kg of Al powder are heated in place, and tap S：0.001%
5. argon for protecting pouring, cast Φ 430, the electrode bars of Φ 450 are used.

Claims (5)

1. a kind of low-carbon (LC), low nitrogen, hyperoxia ingot iron, it is characterised in that：Ingot iron chemical composition (%)：C≤0.09, Si： 0.15~0.20, Mn≤0.35, S≤0.001, P≤0.006, Ni, Cr are not limited, Al≤0.030, Ti≤0.015, and remaining is Fe, [O]≥0.0040、[N]≤0.0040。
2. a kind of low-carbon (LC), low nitrogen, the production method of hyperoxia ingot iron described in claim 1, it is characterised in that：The production work Skill step is as follows：
EAF+LF+VOD+VHD smeltings are carried out using oxidizing process smelting process, steel ingot is molded into after refining；
Production craft step is as follows：
1. eaf process：
Dispensing：Steel scrap, other be the pig iron or return steel composition；
Tapping condition：C >=0.04%, P≤0.003%, temperature >=1630 DEG C；
2. LF techniques：
LF feeds Al by 0.05% in place, using carborundum, Al powder deoxidations, makes white slag, and C >=0.25%, S≤0.002% tapping goes out Tank temperature is：1650 DEG C~1680 DEG C；
3. VOD techniques：
In place, oxygen blast after thermometric stops after oxygen thermometric plus slag charge VOD, and vacuum outgas adds Al2.0kg/t~4.0kg/t, and vacuum≤ 100Pa keeps 10min, when S≤0.001% directly hangs out cast, LF production treatment S is entered when S >=0.001%；
4. VHD techniques：
T >=1620 DEG C are heated to, desulfurization is carried out depending on the appropriate addition Al powder of Si amounts, Si-Ca, poured until being hung out after S≤0.001% Note；
5. pour into a mould：Using argon for protecting pouring.
3. a kind of low-carbon (LC), low nitrogen, the production method of hyperoxia ingot iron according to claim 2, it is characterised in that：The life Production. art step is as follows：
1. eaf process：
Dispensing：15 tons of steel scrap, 16.7 tons of the pig iron, 31.7 tons of total batch；
Tapping：C：0.05%th, P：0.003%, 1672 DEG C of temperature；
2. LF techniques：
LF feeds Al by 0.05% in place, using SiC, Al powder deoxidation, keeps white slag, C：0.35%, S：0.001% tapping, goes out tank Temperature is：1670℃；
3. VOD techniques
In place, vacuum oxygen after thermometric, vacuum outgas adds Al30kg, Si-Ca80kg, vacuum:1mbar, holding 10min, take Sample analyzes C：0.017%th, Si：0.225%th, S：0.0015%；
4. VHD techniques
1630 DEG C, plus Al powder 10kg are heated in place, and tap S：0.001%；
5. argon for protecting pouring, cast Φ 430, the electrode bars of Φ 450 are used.
4. a kind of low-carbon (LC), low nitrogen, the production method of hyperoxia ingot iron according to claim 2, it is characterised in that：The life Production. art step is as follows：
1. eaf process：
Dispensing：15 tons of steel scrap, 19.1 tons of the pig iron, 34.1 tons of total batch；
Tapping：C：0.03%th, P：0.0023%, 1660 DEG C of temperature；
2. LF techniques：
LF feeds Al by 0.05% in place, using SiC, Al powder deoxidation, keeps white slag, C：0.465%S：0.001% tapping, goes out tank Temperature is：1680℃；
3. VOD techniques
In place, vacuum oxygen after thermometric, vacuum outgas adds Al30kg, Si-Ca110kg, vacuum:1mbar, holding 10min, take Sample analyzes C：0.027%th, Si：0.18%th, S：0.001%；
4. VHD techniques
1623 DEG C, plus Si-Ca 8kg are heated in place, and tap S：0.001%
5. argon for protecting pouring, cast Φ 430, the electrode bars of Φ 450 are used.
5. a kind of low-carbon (LC), low nitrogen, the production method of hyperoxia ingot iron according to claim 2, it is characterised in that：The life Production. art step is as follows：
1. eaf process：
Dispensing：15 tons of steel scrap, 19.1 tons of the pig iron, 34.1 tons of total batch；
Tapping：C：0.05%th, P：0.002%, 1681 DEG C of temperature；
2. LF techniques：
LF feeds Al by 0.05% in place, using SiC, Al powder deoxidation, keeps white slag, C：0.28%S：0.002% tapping, goes out tank temperature Spend and be：1678℃；
3. VOD techniques
In place, vacuum oxygen after thermometric, vacuum outgas adds Al100kg, Si-Ca50kg, vacuum:1mbar keeps 10min, takes Sample analyzes C：0.012%th, Si：0.11%th, S：0.0017%；
4. VHD techniques
1618 DEG C, plus 10kg, Si-Ca 30kg of Al powder are heated in place, and tap S：0.001%；
5. argon for protecting pouring, cast Φ 430, the electrode bars of Φ 450 are used.
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CN106282484B (en) * 2016-09-05 2019-02-15 攀钢集团攀枝花钢铁研究院有限公司 Titanium slag furnace by-product smelting industrial pure iron and its method
CN107502696A (en) * 2017-07-27 2017-12-22 抚顺特殊钢股份有限公司 A kind of EMU bearing steel production labor industry pure iron and preparation method
CN109852761A (en) * 2019-03-07 2019-06-07 包头钢铁（集团）有限责任公司 A kind of production method of ingot iron
CN111663015B (en) * 2020-05-29 2022-06-07 山东墨龙石油机械股份有限公司 Method for producing pure iron by smelting reduction process
CN111961803A (en) * 2020-09-08 2020-11-20 中冶赛迪工程技术股份有限公司 Production process and method of industrial pure iron
CN112375961A (en) * 2020-10-26 2021-02-19 本钢板材股份有限公司 Method for producing high-purity industrial pure iron by adopting intermediate frequency furnace duplex method
CN112981038B (en) * 2021-04-22 2021-07-30 北京科技大学 Method for reducing nitrogen content in steel to obtain low-nitrogen steel in electric furnace steelmaking process
CN115044820B (en) * 2022-05-30 2023-09-26 鞍钢股份有限公司 Smelting method of ultralow-carbon ultralow-sulfur pure iron

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