CN109454211A - The method of electric furnace smelting high quality pinion steel - Google Patents

The method of electric furnace smelting high quality pinion steel Download PDF

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Publication number
CN109454211A
CN109454211A CN201811412633.8A CN201811412633A CN109454211A CN 109454211 A CN109454211 A CN 109454211A CN 201811412633 A CN201811412633 A CN 201811412633A CN 109454211 A CN109454211 A CN 109454211A
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electric furnace
control
soft blow
steel
sulphur
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冯桂萍
赵敏
李刚
刘金鑫
李强
王志才
马群
赵智刚
顾文涛
郭晓俊
曹丽红
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FUSHUN SPECIAL STEEL SHARES Co Ltd
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FUSHUN SPECIAL STEEL SHARES Co Ltd
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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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/527—Charging of the electric furnace
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • 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
    • C21C7/0025—Adding carbon material
    • 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
    • C21C7/10—Handling in a vacuum
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/18—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
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

A kind of method that the present invention discloses electric furnace smelting high quality pinion steel, it is therefore an objective to realize high cleanliness and narrow hardenability band.To achieve the above object, following key measures are taken: the measure in terms of degree of purity: optimization oxygen supply curve, control electric steel tapping oxygen content；Optimized alloy material charging sequence guarantees precipitation desoxydation effect；Rationally soft blow and hello sulphur time after control VD.Narrow hardenability band control measure: it is optimized to set up meter separately, stokehold smelting component is controlled by interior control value；It is designed using DOE, Proper Match is carried out to the degree of superheat, two cold intensities of cooling, pulling rate of continuous casting billet, high evenness tissue is obtained, reduces component segregation；Establish accurate harden ability computation model.The utility model has the advantages that final finished material total oxygen content is not more than 12 × 10‑6；Hardenability band is not more than 95% or more the qualification rate of 4HRC；7 grades~6 grades of grain size；Non-metallic inclusion is not more than 2 grades.

Description

The method of electric furnace smelting high quality pinion steel
Technical field
The invention belongs to metal material manufacturing fields, disclose a kind of using the narrow hardenability pinion steel of electric furnace smelting process production The method of FAS3420H is mainly used for the production of automobile gearbox gear and gear axle-steel.
Background technique
Nearly ten years, also higher and higher to the quality requirement of Automobile Gear Steels with the fast development of auto manufacturing, it is main In terms of the degree of purity and the narrow harden ability that are embodied in steel.Although China pinion steel field achieves significant technological progress, but with Lower aspect and international most advanced level still have gap, as shown in table 1:
The comparison of the domestic and international pinion steel quality level of table 1
Based on the above situation, further to promote pinion steel quality level, 2016, " automobile gear was stablized with steel quality Property promote development key technology and application " be listed in state key research and development project, project request uses the tooth of eaf process production Wheel steel oxygen content reaches 12 × 10-6Hereinafter, hardenability band is not more than 4HRC.According to rough estimates in 2016, low-carbon pinion steel oxygen Content average value 12.4 × 10-6, it is not more than 12 × 10-6Qualification rate be only 60%, hardenability band be not more than 4HRC qualification Rate 60%.Using electric furnace+LF+VD technique produce low-carbon pinion steel, with height turn flow process i.e. blast furnace+converter+RH compare and Speech, disadvantage are that the difference of raw material leads to the increase of technology difficulty, and electric furnace raw material uses the pig iron+steel scrap, due to needing oxygen blast to help Molten, there are serious peroxidating phenomenons for electric steel, higher so as to cause original oxygen content, increase unfavorable item for LF external refining deoxidation Part；It is larger to harden ability influence of fluctuations since steel scrap residual element content is higher, and narrow harden ability is mentioned to gear shifting quadrant texturing is reduced High gear life is particularly important.The fluctuation of harden ability is mainly by raw material, stokehold smelting component, component segregation and heat processing technique It influences, improves casting blank solidification structural homogenity and the stable fine grain structure of acquisition is extremely crucial.
Summary of the invention
A kind of method that the present invention discloses electric furnace smelting high quality pinion steel, it is therefore an objective to by being optimized to set up meter separately, use Smelting and throwing new process realize high cleanliness and narrow hardenability band.
To achieve the above object, following key measures are taken:
Measure in terms of degree of purity: on the one hand optimization oxygen supply curve (see Fig. 1), control electric steel tapping oxygen content；It is another Aspect optimized alloy material charging sequence guarantees precipitation desoxydation effect, provides advantage for LF refining deoxidation effect；Rationally control Soft blow and hello sulphur time, prevent large-scale complex sulfide after VD.
Narrow hardenability band control measure: it is on the one hand optimized to set up meter separately, stokehold smelting component is controlled by interior control value；Another party Face is designed using DOE, is carried out Proper Match to the degree of superheat, two cold intensities of cooling, pulling rate of continuous casting billet, is obtained high evenness group It knits, reduces component segregation；The third aspect establishes accurate harden ability computation model.
Grain size control measure: guaranteeing heating cycle and finish to gauge system, reaches the distribution of austenite grain fine uniform.
Specifically use following technical scheme:
1. process route are as follows: electric furnace → LF → VD → 240 sides of continuous casting → walking beam furnace heats the rolling of → 24 frame tandem mills, packet Include process for making, heating process and rolling mill practice.
2. concrete technology measure:
(1) process for making
Set up meter separately 1. studying
According to U.S. ASTM A255 criterion calculation, in conjunction with practical end quenching test as a result, using mass data regression analysis, FAS3420H chemical component inner quality standard is formulated, is shown in Table 2.
2 FAS3420H chemical component of table
2. eaf process
Total 69 tons of batch, ingredient select high-quality steel scrap, the pig iron to be no less than 25 tons；Melt latter stage making foamed slag, the heat of oxidation Early stage a large amount of stream slags, tapping temperature are not less than 1630 DEG C, and phosphorus is no more than 0.010%, 0.06% or more aim carbon, and electric furnace steel tapping is mixed Carburant 10kg~20kg is rushed, alloy materials, lime slag charge, calcium carbide 1kg/t, the aluminium ingot 1kg/ such as manganese iron, ferrochrome, ferrosilicon is then added T guarantees that free space is not less than 600mm, and electric furnace steel tapping oxygen content is not more than 800 × 10-6, forbid lower oxidizing slag.
3. LF technique
Aluminium is fed by 0.06% ± 0.01% in place, whole process uses carbon dust+aluminum shot diffusive deoxidation, and clinker bleaches, and temperature T is not low It is sampled in 1540 DEG C, alloying element is adjusted to lower specification limit according to 1 result of sample, considers to feed aluminium by 0.06% in furnace, aluminium control exists 0.03%~0.05%, the white slag retention time is no less than 30min；Aluminium content is greater than 0.02% after guaranteeing VD processing, remaining time Aluminum steel is not fed as far as possible；It is calculated by 0.02% and niobium-iron is added；Tapping temperature is not higher than 1700 DEG C, and sulphur is not more than 0.008%.
4. VD technique
Aluminum steel and silicon-calcium wire are fed before VD, consider to feed aluminium by 0.05% in furnace before vacuum, 1kg/t feeds calcium-silicon again after hello aluminum steel Line；Vacuum degree is not higher than 100Pa, and the vacuum lower retention time is no less than 15min；Soft blow time 5min~10min after vacuum breaker is fed Enter sulphur line, total soft blow time 20min~40min, when soft blow is advisable with liquid level fine motion, and molten steel must not be exposed.
5. continuous casting process
The continuous casting degree of superheat: 20 DEG C~40 DEG C, pulling rate: 0.8m/min ± 0.1m/min, secondary cooling water flow: 0.18L/kg~ 0.19L/kg。
(2) rolling mill practice
1160 DEG C ± 30 DEG C of slab heating temperature, speed of coming out of the stove 100S/ branch~160S/ branch, finishing temperature 850 DEG C~950 ℃。
(3) physicochemical property
1. degree of purity index
Oxygen content is not more than 0.0012%；
Non-metallic inclusion is shown in Table 3
3 non-metallic inclusion of table
2. harden ability index is shown in Table 4
4 harden ability of table
From quenched end distance mm 6 9
Hardness number (HRC) 34~38 26~30
3. grain size
Grain size presses 6394 standard test of GB/T, and through 930 DEG C × 4h water cooling, autstenitic grain size is not less than 6 grades.
4. steel product cross-sectional Δ C≤0.02%.
To the explanation of innovative point of the present invention:
(1), to improve steel degree of purity, low oxygen content is obtained, in research FAS3420H pinion steel whole process oxygen content variation On the basis of rule, the key technology taken optimizes electric furnace oxygen supply system, control electric furnace steel tapping oxygen content no more than 800 × 10-6；Alloy material charging sequence after change electric furnace steel tapping；LF optimizes slag system, the control white slag time is not less than 30min；VD vacuum breaker Weak, time 5min~10min after control soft blow intensity is first strong afterwards, then sulphur line is fed, guarantee that field trash sufficiently floats；Continuous casting is complete Journey molding casting, prevents secondary oxidation.
(2) to realize narrow hardenability band, analyzed by software and regression data, optimize Design of Chemical Composition, and establish target Value control, the difficult point for optimizing Design of Chemical Composition is the design of smelting component, including refine the aluminium, nitrogen, niobium of crystal grain element at The design divided, stokehold and the stokehold LF ingredient are precisely controlled, and the VD later period is precisely controlled C content；It is designed using DOE, optimization continuous casting is cold But the parameter degree of superheat, pulling rate, two cold cooling water flows control slab component segregation；Accurate harden ability model is established and optimizes, Guarantee theoretical value and the actual value goodness of fit, reduces the influence of checking system deviation.
(3), for control grain size, crystal grain element aluminum, niobium, nitrogen content are refined in steel of keeping under strict control, while heating temperature properly increases, Guarantee that niobium carbonitrides sufficiently dissolve, the disperse educt in the later period operation of rolling prevents Austenite Grain Growth, while controlling finish to gauge System, obtains high evenness tissue, and control steel total cross-section Δ C is not more than 0.02%.
Beneficial effects of the present invention:
Steel degree of purity is improved, final finished material total oxygen content is not more than 12 × 10-6；Steel product cross-sectional Δ C% is reduced, is led to Reduction component segregation is crossed, harden ability forecasting model is established using big data statistical analysis, is calculated by forecasting model, hardenability band No more than 4HRC, actually detected hardenability band reaches 95% or more no more than 4HRC qualification rate；6 grades~8 grades of grain size；Non- gold Belong to field trash and be not more than 2 grades, realizes the target of the narrow hardenability pinion steel FAS3420H of electric furnace smelting.
Detailed description of the invention
Fig. 1 is FAS3420H whole process oxygen supply system curve graph；
Fig. 2 is measured value (HRC) at FAS3420H harden ability model J6；
Fig. 3 is measured value (HRC) at FAS3420H harden ability model J9.
Specific embodiment
It elaborates with reference to the accompanying drawings and detailed description to the present invention.
Embodiment 1 and embodiment 2 use same process flow: electric furnace → LF → VD → 240 sides of continuous casting → walking beam furnace adds The rolling of heat → 24 frame tandem mills.
Embodiment 1
Heat (batch) number: 17213023722, trimmed size: Φ 80mm.
(1) process for making
1. chemical component
FAS3420H chemical component is shown in Table 5
5 chemical component of table
2. eaf process
Total 68.55 tons of batch, selects steel scrap, pig iron amount of allocating 36%；1639 DEG C of tapping temperature, phosphorus content is 0.0087%, aim carbon 0.009% reduces before tapping and uses oxygen intensity, sprays carbon dosage 10Kg, calcium carbide 100kg；Final deoxidizing adds aluminium 60kg；Free space 700mm, oxygen content 556 × 10-6, do not descend oxidizing slag.
3. LF technique
Aluminium is fed by 0.06% in place, whole process uses carbon dust+aluminum shot diffusive deoxidation, first batch of additional amount 42Kg, according to the full aluminium knot of sample 1 Fruit feeds aluminium, white slag retention time 40min by 0.06%；It is calculated by 0.025% and niobium-iron is added；1690 DEG C of tapping temperature, sulphur: 0.003%.
4. VD technique
It skims on a small quantity before entering tank, feeds aluminium by 0.05% before vacuum, feed calcium-silicon line by 1kg/t, vacuum degree is not higher than 100Pa, vacuum lower retention time 18min；Soft blow 5min after releasing vacuum, feeds sulphur line, soft blow time 15min, tapping temperature 1609℃。
5. continuous casting
1597 DEG C of temperature of arriving at a station, 32 DEG C~40 DEG C of the automatic casting degree of superheat, pulling rate (m/s) 0.8~0.90, secondary cooling water stream It measures (L/kg): 0.18~0.186.
(2) processing technology
1. slab heats: 1160 DEG C~1190 DEG C, speed of coming out of the stove 120S/ branch；
2. slab rolls: finishing temperature: 930 DEG C~940 DEG C.
(3) production testing result:
1. finished product material total oxygen content 10 × 10-6；Fig. 1 is shown in the variation of whole process oxygen content；
2. field trash inspection result is shown in Table 6
6 examination of nonmetallic inclusion result of table
3. grain size uses 930 DEG C of 7 grades~6 grades of heat preservation 4h grain sizes of direct method；
4. harden ability inspection result is shown in Table 7
7 harden ability of table
From quenched end distance mm 6 9
Hardness number (HRC) 34~38 26~30
Measured value (HRC) 36.5、37.5 29、30
See Fig. 2, Fig. 3.
6. face Δ C
Steel specs Φ 80mm makes a call to 5 drilling cuttings along steel uniform diameter using Φ 5mm drill bit, carries out C content analysis, point Analysis the results are shown in Table 8, section Δ C% (maximum value-minimum value)=0.016%；
The calibration of 8 steel product cross-sectional carbon content of table
Position 1 2 3 4 5
C content % 0.203 0.216 0.203 0.214 0.198
Embodiment 2
Heat (batch) number: 17213013876, trimmed size: Φ 90mm.
(1) process for making
1. chemical component
FAS3420H chemical component is shown in Table 9
9 chemical component of table
2. eaf process
Total 69.05 tons of batch, selects steel scrap, pig iron amount of allocating 36.2%；1655 DEG C of tapping temperature, phosphorus content is 0.01%, aim carbon 0.07% reduces before tapping and uses oxygen intensity, sprays carbon dosage 10Kg, calcium carbide 100kg；Final deoxidizing adds aluminium 60kg； Free space 900mm, oxygen content 653 × 10-6, do not descend oxidizing slag.
3. LF technique
Aluminium is fed by 0.06% in place, whole process uses carbon dust+aluminum shot diffusive deoxidation, first batch of additional amount 40kg, according to the full aluminium knot of sample 1 Fruit feeds aluminium, white slag retention time 40min by 0.06%；It is calculated by 0.025% and niobium-iron is added；1690 DEG C of tapping temperature, sulphur: 0.003%.
4. VD technique
It skims on a small quantity before entering tank, aluminium 100m, calcium-silicon line 90m is fed before vacuum, vacuum degree is not higher than 100Pa, protects under vacuum Hold time 16min；Release vacuum after soft blow 5min, feed sulphur line 80m, soft blow time 15min, 1615 DEG C of tapping temperature.
5. continuous casting
1600 DEG C of temperature of arriving at a station, automatic casting, 33 DEG C~39 DEG C of the degree of superheat, pulling rate 0.8m/s~0.90m/ s, secondary cooling water Flow (L/kg): 0.19.
(2) processing technology
1. slab heats: soaking section temperature: 1162 DEG C~1189 DEG C, speed of coming out of the stove 120s/ branch.
2. slab rolls: finishing temperature: 930 DEG C~945 DEG C
(2) production testing result:
1. finished product material total oxygen content 10 × 10-6；Fig. 1 is shown in the variation of whole process oxygen content.
2. field trash inspection result is shown in Table 10
10 examination of nonmetallic inclusion result of table
3. grain size uses 930 DEG C of direct method, 7 grades of grain size of heat preservation 4h.
4. harden ability inspection result is shown in Table 11
11 harden ability of table
From quenched end distance mm 6 9
Hardness number (HRC) 34~38 26~30
Measured value (HRC) 35.5、35 29、28
See Fig. 2, Fig. 3.
5. section Δ C
Steel specs Φ 90mm makes a call to 5 drilling cuttings along steel uniform diameter using Φ 5mm drill bit, carries out C content analysis, point Analysis the results are shown in Table 12, section Δ C% (maximum value-minimum value)=0.016%.
The calibration of 12 steel product cross-sectional carbon content of table
Position 1 2 3 4 5
C content % 0.219 0.222 0.207 0.215 0.206

Claims (3)

1. a kind of method of electric furnace smelting high quality pinion steel, it is characterised in that: the method takes effective technology measure:
Measure in terms of degree of purity: optimization oxygen supply curve, control electric steel tapping oxygen content；Optimized alloy material charging sequence；It closes Soft blow and hello sulphur time after reason control VD；
Narrow hardenability band control measure: optimization stokehold smelting component formulates interior control value；It is designed using DOE, to the overheat of continuous casting billet Degree, two cold intensities of cooling, pulling rate carry out Proper Match；Establish accurate harden ability computation model；
Grain size control measure: guarantee heating cycle and finish to gauge system；
The optimization electric furnace oxygen supply system is shown in Table 1, and control electric furnace steel tapping oxygen content is not more than 800 × 10-6；
1 oxygen-supplying amount of table
The optimized alloy material charging sequence, electric furnace steel tapping is mixed to rush carburant 10kg~20kg, and manganese iron, ferrochrome, silicon is then added The alloy materials such as iron, lime slag charge, calcium carbide 1kg/t, aluminium ingot 1kg/t；
Soft blow and the sulphur time is fed after the control VD, soft blow time 5min~10min after vacuum breaker feeds sulphur line, when total soft blow Between 20min~40min, when soft blow is advisable with liquid level fine motion, and molten steel must not be exposed；
Control value (%) in the optimization stokehold smelting component formulation: carbon: 0.20~0.22, manganese: 0.84~0.88, silicon: 0.24~ 0.28, phosphorus: it is not more than 0.015, nickel: 0.52~0.56, chromium: 0.52~0.56, molybdenum: 0.19~0.21, aluminium: 0.015~ 0.035；
Described to design the Proper Match continuous casting degree of superheat using DOE: 20 DEG C~40 DEG C, pulling rate: 0.8m/min ± 0.1m/min, two is cold Water flow (L/kg): 0.18~0.19；
The grain size control measure: 1160 DEG C ± 30 DEG C of slab heating temperature, speed of coming out of the stove 100S/ branch~160S/ branch, finish to gauge 850 DEG C~950 DEG C of temperature.
2. a kind of method of electric furnace smelting high quality pinion steel according to claim 1, it is characterised in that:
The optimized alloy material charging sequence, 68.55 tons of total batch；Electric furnace steel tapping, which mixes, rushes carburant 10kg, calcium carbide 100kg, Aluminium ingot 60kg；
Soft blow 5min after the control VD vacuum breaker feeds sulphur line, soft blow time 15min；
The stokehold is smelted into score value (%): carbon: 0.205, manganese: and 0.84, silicon: 0.24, sulphur: 0.023, phosphorus: 0.008, nickel: 0.54, chromium: 0.54, molybdenum: 0.19, aluminium: 0.023；
32 DEG C~40 DEG C of the continuous casting degree of superheat, pulling rate 0.8m/min~0.90m/min, secondary cooling water flow: 0.186L/kg；
The grain size control measure: 1160 DEG C~1190 DEG C of slab heating temperature, speed of coming out of the stove 120S/ branch；Finishing temperature 930 DEG C~940 DEG C.
3. a kind of method of electric furnace smelting high quality pinion steel according to claim 1, it is characterised in that:
The optimized alloy material charging sequence, 69.05 tons of total batch；Electric furnace steel tapping, which mixes, rushes carburant 10kg, calcium carbide 100kg, Aluminium ingot 60kg；
Soft blow 5min after the control VD vacuum breaker feeds sulphur line, soft blow time 15min；
The stokehold is smelted into score value (%): carbon: 0.203, manganese: and 0.83, silicon: 0.5, sulphur: 0.023, phosphorus: 0.010, nickel: 0.53, Chromium: 0.54, molybdenum: 0.19, aluminium: 0.022；
33 DEG C~39 DEG C of the continuous casting degree of superheat, pulling rate 0.8m/min~0.90m/min, secondary cooling water flow: 0.19L/kg；
The grain size control measure: 1162 DEG C~1189 DEG C of slab heating temperature, speed of coming out of the stove 120s/ branch, finishing temperature 930 DEG C~945 DEG C.
CN201811412633.8A 2018-11-26 2018-11-26 The method of electric furnace smelting high quality pinion steel Pending CN109454211A (en)

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