CN105463299A - Smelting method of high-aluminum nitriding steel - Google Patents
Smelting method of high-aluminum nitriding steel Download PDFInfo
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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Abstract
The invention belongs to the technical field of alloy structural steel, and particularly relates to a manufacturing method of high-aluminum nitriding steel. The process route of EAF-CONVERTER smelting and LF+VD+CCM are adopted to smelt the high-aluminum nitriding steel, and according to the component requirement range of the obtained high-aluminum nitriding steel, the high-aluminum nitriding steel comprises 0.35% to 0.40% of C, 0.20% to 0.30% of Si, 0.40% to 0.50% of Mn, 1.40% to 1.50% of Cr, 0.15% to 0.25% of Mo, 0.75% to 1.00% of Al, not larger than 0.020% of P, not larger than 0.015% of S, and the balance Fe. Round steel obtained through rolling is even in steel texture, high in cleanness and stable in performance quality.
Description
Technical field
The invention belongs to structural alloy steel technical field, be specifically related to a kind of manufacture method of high alumina nitriding steel.
Background technology
High alumina nitriding steel is a kind of modified nitriding steel based on high-aluminum steel, surface forms aluminium nitride (AlN) layer after Nitrizing Treatment, utilize the dispersion-strengthened of aluminium nitride to improve hardness and the intensity on surface, and also can keep certain hardness when comparatively high temps (600 ~ 700 DEG C), this steel grade is also containing appropriate molybdenum simultaneously, effectively can suppress temper brittleness, therefore, this steel grade have that hardening capacity is good, temper brittleness tendency less, good, the wear resistance of high temperature process and fatigue resistance high feature.This steel grade is widely used in production and has high-wearing feature, high-fatigue strength and sizable intensity, accurate in size nitrogenize part after thermal treatment, or the various nitrogenize part that load is little and wear resistance is high that is hit, as boring bar, grinding machine spindle, self-acting lathe main shaft, worm screw, accurate lead screw, precision gear, high pressure valve, valve rod, gauge, model, roller, paranorm, cylinder body, compressor piston rod, speed regulator on steam turbine, turning set, permanent sleeve, the various wearing pieces etc. on rubber and plastic extruders.
But due to this steel grade aluminum content high; be oxidized during smelting, fixed nitrogen, to return silicon trend large, continuous casting production process very easily there is the phenomenon such as secondary oxidation, covering slag inefficacy thus cause that Al yield is unstable, non-metallic inclusion controls that difficulty increases, slag dross is general and serious, the problem such as spot segregation takes place frequently.
Summary of the invention
For solving the problem mentioned in above-mentioned background technology, the present invention adopts the operational path smelting high aluminium nitriding steel of EAF-CONVERTER electricity converter smelting+LF+VD+CCM, the high alumina nitriding steel component requirements scope of gained is: C0.35 ~ 0.40%, Si0.20 ~ 0.30%, Mn0.40 ~ 0.50%, Cr1.40 ~ 1.50%, Mo0.15 ~ 0.25, Al0.75 ~ 1.00%, P≤0.020%, S≤0.015%, surplus is Fe.
Concrete technology is:
(1) EAF-CONVERTER electricity converter smelting
The total Intake Quantity of electricity converter controls at about 100 tons, and molten iron proportion is 90%, and cold burden ratio is 10%, and wherein 3% is the pig iron, and all the other are high-quality steel scrap; Electric furnace is furnished with molten iron tipple, adopts online molten iron loading pattern, in conjunction with foam slag operation technique, stablizes reaction between carbon and oxygen atmosphere in stove, reaches the object of de-P temperature control; This step requires catch carbon practice, forbids Molten Steel over-oxidation of tapping, and go out composition of steel and meet 0.12%≤C≤0.20%, P≤0.010% and can tap, tapping temperature T>=1640 DEG C, guarantee fast slag; Tap controls at 85 ± 2 tons, to ensure Steel ladle clearance height, guarantees that vacuum suction is smooth; Tapping process adds 150kgAl block and the deoxidation of 150kg calcium carbide, adds silicomanganese, high carbon ferro-chrome and ferro-molybdenum, and adds 800kg lime and 300kg low silicon synthesis slag charge (SiO
2≤ 2.0%) slag making; Tapping strictly controls remaining steel amount (10 ~ 13 tons/stove) in stove latter stage, forbids slag of tapping, and effectively avoids the impact of electric furnace slag on molten steel component (particularly P, Si) and the deterioration effect of refining condition;
(2) LF refining
LF refining uses Al grain and a small amount of SiC to carry out deoxidation early stage, middle and later periods short run repeatedly evenly flies away SiC to top of the slag deoxidation guarantor slag, keep the reducing atmosphere of well-refined, be conducive to LF refining early stageization slag and ensure that LF refining high basicity slag in latter stage has proper viscosity and mobility adding of SiC simultaneously, good slag condition is the important foundation guaranteeing that follow-up VD vacuum-treat is carried out smoothly; First sample ingredient out adds alloy adjusting component afterwards, refining adjustment argon pressure to 0.4 ~ 0.6MPa in early stage (adjusting depending on slag situation), and middle and later periods argon pressure is 0.2 ~ 0.35MPa, keeps pressure-fired in stove; First 10 minutes of refining bull ladle (refining terminates first 10 minutes) reaches the target content of each element except Al, Si; Before before entering VD, feeding aluminum steel adjustment Al content reaches 0.100%, LF bull ladle, Si controls the lower limit at composition range, exceeds Si content span of control after preventing vacuum from returning silicon (returning silicon amount 0.03 ~ 0.05%) in a large number; Refining time reaches 40 ~ 70 minutes, molten steel temperature meets the requirements, slag condition rationally (dual alkalinity R:9 ~ 15), namely bull ladle enters VD and carries out vacuum-treat,
In step (2), it is to strengthen deep deoxidation effect that early stage adds silicon carbide, being conducive to slag simultaneously; It is then to keep white slag state and keep the reductibility of furnace atmosphere, ensureing to be maintained to the deoxidation effect of molten steel that middle and later periods repeatedly adds silicon carbide, and is also convenient to regulate slag condition, is laying the foundation smoothly of follow-up VD process;
(3) VD vacuum-treat
First first time vacuum-treat is carried out during this step, be evacuated to high vacuum (≤67Pa) pressurize 10 minutes afterwards, require under high vacuum that obviously molten steel is exposed as seen to seethe, 8.5kg/t aluminium block is added after broken sky, vacuumize again and carry out second time vacuum-treat, pressurize 5 minutes under condition of high vacuum degree (≤67Pa), aluminium block stirs through argon gas and dissolves and be uniformly distributed in molten steel, thus completes the aluminium alloying of molten steel; VD vacuum process returns silicon amount and controls in 0.03 ~ 0.05% scope; After the broken sky of second time, connect the first stove watering group and feed 80 meters of pure Ca lines, carry out inclusions class, guarantee to open the castability of watering stove, follow-up heat is forbidden to feed Ca line, and during to avoid line feeding, serious secondary oxidation occurs molten steel; Soft blow time >=35 minutes, guarantee that in molten steel, inclusion fully floats;
(4) CCM continuous casting
Continuous casting even waters heat superheating temperature and controls at 15 ~ 25 DEG C, and first stove superheating temperature is suitably increased to 25 ~ 35 DEG C; Steel grade continuous casting low power of the present invention easily produces loose, the permanent casting speed control of strict implement 0.70m/min; Casting process adopts alkaline covering agent, in middle bag, magnesia barricade is installed, the operation of the black top of the slag is wrapped in maintenance, add the argon shield between powerful water-coating port and long nozzle, increase the lower mouth of a river of large bag and long nozzle seam crossing external placed type argon ring, keep pressure-fired (0.7 ~ 0.9pa), reduce the secondary oxidation of casting process as far as possible; Employing Φ 45mm adds the heavy caliber mouth of a river, increases the contact area at inclusion and the mouth of a river, reduces the inclusions in unit mouth of a river inner wall area, reduces inclusion in molten steel and assembles the probability of dross; In addition, high-aluminum steel mould flux (Al is used
2o
3content≤3.0%), to prevent casting process from occurring the situation that covering slag lost efficacy, and the inclusion in active adsorption molten steel, improve the castability of molten steel further, increase casting sequence.
Beneficial effect of the present invention is: in the smelting of high alumina nitriding steel, courageously enable siliceous reductor silicon carbide and promote steel liquid deoxidation and the loss reducing refining process aluminium, successfully solve the problem of silicone content, meanwhile vacuum process returns silicon amount and is also effectively controlled; Adding of appropriate silicon carbide also ensure that slag effect is changed in LF refining in early days and LF high alkalinity refining finishing slag has good viscosity and mobility: refining slag good fluidity and viscosity is suitably the important foundation preventing the serious air-breathing of refining process molten steel and ensure follow-up VD vacuum-treat degasifying effect, employing high basicity slag when this steel grade is smelted, goes out tempering slag effect and Molten Steel Flow can not be ensured very well.For this reason, usually need add fluorite at refining stage to carry out promotion slag and obtain the suitable and good slag of mobility of viscosity, but although adding of fluorite is conducive to raisingization slag effect, also the corrosion of the resistance to material of ladle will be increased the weight of simultaneously, and silicon carbide be added in the prerequisite not corroding resistance to material under be conducive to promoting the improvement of refining slag mobility, reduce molten steel bare area and probability, also the foaminess of refining slag will be strengthened simultaneously, being conducive to the refining initial stage has made foamy slag, realize arc-covering slag operation, refining air-breathing is suppressed further while saving power consumption, the particularly disadvantageous effect of nitrogen pick-up.
The present invention utilizes the slagging process of simplification to obtain high basicity slag, strengthens the adsorption be mingled with aluminium sesquioxide in molten steel, ensures molten steel cleanness further; Adding opportunity by optimizing aluminium block, achieving higher Al yield while reducing fixed nitrogen effect, making this production method more competitive in cost; Continuous casting working procedure is strictly carried out molding casting and is adopted high-aluminum steel mould flux and the heavy caliber mouth of a river, achieves and waters steadily connecting of the many heats of this high alumina steel grade.Rolling obtains that the steel of round steel is even, cleanliness factor is high, performance quality is stable.
Embodiment
Embodiment 1
The operational path of EAF-CONVERTER electricity converter smelting → LF stove refining → VD vacuum-treat → CCM continuous casting is adopted to produce high alumina nitriding steel:
The total Intake Quantity of electricity converter controls at 101.46 tons, and hot metal ratio 90%, pig iron add-on is 3.2 tons, and all the other are high-quality steel scrap.Tapping terminal composition C:0.12%, P:0.008%, tapping temperature T:1642 DEG C, tap 87.2 tons; Tapping process adds 120kgAl block and the deoxidation of 110kg calcium carbide, adds silicomanganese 455kg, high carbon ferro-chrome 2148kg and molybdenum-iron 250kg and carries out alloying after stove, and adds 800kg lime and 300kg low silicon synthesis slag charge carries out slag making;
LF refining adopts 80kg aluminum shot and 30kg silicon carbide to strengthen deoxidation early stage, and argon bottom-blowing pressure adjusting is to 0.45MPa, and namely electrified regulation realized white slag after 8 minutes; Get after LF first sample measures composition and add 46kg silicomanganese (FeSi18Mn68), 175kg high carbon ferro-chrome (FeCr55C10.0), 50kg molybdenum-iron (FeMo60), reach the finished product target component (wherein Si range lower limit control on request) of each element except Al, Si; After slag has changed white slag into and alloying constituent puts in place substantially, short run repeatedly (8 times) has evenly flown away SiC to top of the slag deoxidation guarantor slag, and amount to 18kg, argon flow amount is adjusted to 0.27MPa; LF bull ladle first 10 minutes feeding aluminum steel adjustment Al content to 0.102%, VD stove on bull ladle immediately, bull ladle temperature 1658 DEG C, LF refining duration 63 minutes;
A vacuum-treat is first carried out during VD process, and (67Pa) pressurize 10 minutes under condition of high vacuum degree, broken empty immediately, remove VD bell, add 750kg aluminium block in molten steel, then VD bell is resetted, proceed secondary vacuum pumping process, 67Pa pressurize 5 minutes.In secondary vacuum treating processes, suitably strengthen ladle bottom blowing argon flow amount, guarantee that the aluminium block added stirs through argon gas and be dissolved in molten steel, thus complete the aluminium alloying of molten steel, the aluminium block rate of recovery is 92.1%.This stove organizes the first stove for this, therefore after vacuum-treat, feed 18kg (80m) pure calcium line, and soft blow 39 minutes, to carry out inclusion modification and process of floating, guarantee to open the castability of watering stove, VD bull ladle temperature 1572 DEG C;
Continuous casting superheating temperature 29 DEG C, the constant 0.70m/min of pulling rate; Open M-EMS (150A/2Hz) and end induction stirring (80A/6Hz), guarantee molten steel homogeneity; Casting process adopts alkaline covering agent, installs magnesia barricade in middle bag, wraps the operation of the black top of the slag in maintenance, add the argon shield between powerful water-coating port and long nozzle, increase the lower mouth of a river of large bag and long nozzle seam crossing external placed type argon ring, keep pressure-fired 0.8Pa, reduce secondary oxidation as far as possible; Employing high-quality built in type Φ 45mm adds the heavy caliber mouth of a river and high-aluminum steel mould flux, and this group connects altogether waters 9 stoves, and casting cycle is steady, does not occur serious liquid fluctuating and dross phenomenon.
Smelt high-aluminum steel is C:0.37%, Si:0.26%, Mn:0.42%, Cr:1.45%, Mo:0.21%, Al:0.85%, P:0.011%, S:0.001% through the finished product composition of rolling gained round steel by aforesaid method, surplus is Fe.
Low power Indexs measure result display centre is loose, General Loosen is 0.5 grade, and center segregation is 1.0 grades, and does not occur general spot segregation and edge spot segregation, reaches the standard of superfine high-quality steel in GB/T3077-1999; Metallographic high power detects and shows that A, C class non-metallic inclusion is 0 grade, and category-B is the highest is no more than 0.5 grade, and D class is the highest is no more than 1.0 grades, oxygen level 4.3ppm, nitrogen content 33.5ppm.
Embodiment 2
The operational path of EAF-CONVERTER electricity converter smelting → LF stove refining → VD vacuum-treat → CCM continuous casting is adopted to produce high alumina nitriding steel:
The total Intake Quantity of electricity converter controls at 100.62 tons, and hot metal ratio 91%, pig iron add-on is 2.9 tons, and all the other are high-quality steel scrap.Tapping terminal composition C:0.15%, P:0.009%, tapping temperature T:1649 DEG C, tap 86.8 tons; Tapping process adds 150kgAl block and the deoxidation of 100kg calcium carbide, adds silicomanganese 450kg, high carbon ferro-chrome 2150kg and molybdenum-iron 260kg and carries out alloying after stove, and adds 750kg lime and 200kg low silicon synthesis slag charge carries out slag making;
LF refining adopts 70kg aluminum shot and 25kg silicon carbide to strengthen deoxidation early stage, and argon bottom-blowing pressure adjusting is to 0.55MPa, and namely electrified regulation realized white slag after 10 minutes; Get after LF first sample measures composition and add 50kg silicomanganese (FeSi18Mn68), 105kg high carbon ferro-chrome (FeCr55C10.0), 30kg molybdenum-iron (FeMo60), the front finished product target component (wherein Si range lower limit control on request) reaching each element except Al, Si for 15 minutes of bull ladle; Refining middle and later periods short run after slag has changed white slag into and alloying constituent puts in place substantially repeatedly evenly flies away SiC to top of the slag deoxidation guarantor slag, and amount to 16kg, argon flow amount is adjusted to 0.25MPa; LF bull ladle first 10 minutes feeding aluminum steel adjustment Al content to 0.105%, VD stove on bull ladle immediately, bull ladle temperature 1639 DEG C, LF refining duration 58 minutes;
A vacuum-treat is first carried out during VD process, and (≤67Pa) pressurize 12 minutes under condition of high vacuum degree, broken empty immediately, remove VD bell, add 730kg aluminium block in molten steel, then VD bell is resetted, proceed secondary vacuum pumping process, and pressurize 5 minutes.In secondary vacuum treating processes, suitably strengthen ladle bottom blowing argon flow amount, guarantee that the aluminium block added stirs through argon gas and be dissolved in molten steel, thus complete the aluminium alloying of molten steel, the aluminium block rate of recovery is 95.2%.Soft blow 35 minutes after vacuum-treat, to carry out inclusion modification and process of floating, guarantees to open the castability of watering stove, VD bull ladle temperature 1558 DEG C;
Continuous casting superheating temperature 21 DEG C, the constant 0.70m/min of pulling rate; Casting process adopts alkaline covering agent, installs magnesia barricade in middle bag, wraps the operation of the black top of the slag in maintenance, add the argon shield between powerful water-coating port and long nozzle, increase the lower mouth of a river of large bag and long nozzle seam crossing external placed type argon ring, keep pressure-fired 0.9Pa, reduce secondary oxidation as far as possible; Open M-EMS (150A/2Hz); Employing high-quality built in type Φ 45mm adds the heavy caliber mouth of a river and high-aluminum steel mould flux, and this group connects altogether waters 8 stoves, and casting cycle is steady, does not occur serious liquid fluctuating and dross phenomenon;
Smelt high-aluminum steel controls as C:0.38%, Si:0.27%, Mn:0.44%, Cr:1.43%, Mo:0.21%, Al:0.86%, P:0.012%, S:0.001% through the finished product composition of rolling gained round steel by aforesaid method, surplus is Fe.
Low power Indexs measure result display General Loosen is 0.5 grade, center porosity and center segregation are 1.0 grades, does not occur general spot segregation and edge spot segregation, reaches the standard of superfine high-quality steel in GB/T3077-1999 equally; Metallographic high power detects and shows that A, B, C class non-metallic inclusion is 0 grade substantially, and D class is the highest is no more than 1.0 grades, oxygen level 2.5ppm, nitrogen content 36.0ppm.
Embodiment 3
The operational path of EAF-CONVERTER electricity converter smelting → LF stove refining → VD vacuum-treat → CCM continuous casting is adopted to produce high alumina nitriding steel:
The total Intake Quantity of electricity converter controls at 101.81 tons, and hot metal ratio 95%, pig iron add-on is 2.6 tons, and all the other are high-quality steel scrap.Tapping terminal composition C:0.13%, P:0.008%, tapping temperature T:1646 DEG C, tap 85.7 tons; Tapping process adds 150kgAl block and the deoxidation of 100kg calcium carbide, adds silicomanganese 445kg, high carbon ferro-chrome 2140kg and molybdenum-iron 250kg and carries out alloying after stove, and adds 700kg lime and the low silicon synthetic slag of 100kg carries out slag making;
LF refining adopts 85kg aluminum shot and 35kg silicon carbide to strengthen deoxidation early stage, and argon bottom-blowing pressure adjusting, to 0.52MPa, adds lime 100kg, and namely electrified regulation realized white slag after 10 minutes; Get after LF first sample measures composition and add 20kg silicomanganese (FeSi18Mn68), 120kg high carbon ferro-chrome (FeCr55C10.0), 40kg molybdenum-iron (FeMo60), the front finished product target component (wherein Si range lower limit control on request) reaching each element except Al, Si for 15 minutes of bull ladle; Refining middle and later periods short run after slag has changed white slag into and alloying constituent puts in place substantially repeatedly evenly flies away SiC to top of the slag deoxidation guarantor slag, and amount to 15kg, argon flow amount is adjusted to 0.22MPa; LF bull ladle first 10 minutes feeding aluminum steel adjustment Al content to 0.098%, VD stove on bull ladle immediately, bull ladle temperature 1640 DEG C, LF refining duration 59 minutes;
A vacuum-treat is first carried out during VD process, and (≤67Pa) pressurize 10 minutes under condition of high vacuum degree, broken empty immediately, remove VD bell, add 730kg aluminium block in molten steel, then VD bell is resetted, proceed secondary vacuum pumping process, and pressurize 5 minutes.In secondary vacuum treating processes, suitably strengthen ladle bottom blowing argon flow amount, guarantee that the aluminium block added stirs through argon gas and be dissolved in molten steel, thus complete the aluminium alloying of molten steel, the aluminium block rate of recovery is 94.5%.Soft blow 32 minutes after vacuum-treat, VD bull ladle temperature 1563 DEG C;
Continuous casting superheating temperature 23 DEG C, the constant 0.70m/min of pulling rate; Open M-EMS (150A/2Hz) and end induction stirring (50A/6Hz), guarantee molten steel homogeneity; Casting process adopts alkaline covering agent, installs magnesia barricade in middle bag, wraps the operation of the black top of the slag in maintenance, add the argon shield between powerful water-coating port and long nozzle, increase the lower mouth of a river of large bag and long nozzle seam crossing external placed type argon ring, keep pressure-fired 0.8Pa, reduce secondary oxidation as far as possible; Employing built in type Φ 45mm adds the heavy caliber mouth of a river and high-aluminum steel mould flux, and this group connects altogether waters 9 stoves, and casting cycle is steady, does not occur serious liquid fluctuating and dross phenomenon;
Smelt high-aluminum steel controls as C:0.39%, Si:0.24%, Mn:0.45%, Cr:1.46%, Mo:0.19%, Al:0.84%, P:0.010%, S:0.001% through the finished product composition of rolling gained round steel by aforesaid method, surplus is Fe.
Low power Indexs measure result display centre is loose, General Loosen, center segregation are 0.5 grade, does not occur general spot segregation and edge spot segregation, reaches the standard of superfine high-quality steel in GB/T3077-1999; Metallographic high power detects and shows that category-A, category-B, D class non-metallic inclusion are no more than 0.5 grade, and C class is 0 grade, oxygen level 3.0ppm, nitrogen content 33.7ppm.
Claims (5)
1. a manufacture method for high alumina nitriding steel, is characterized in that: described preparation method is the operational path smelting high aluminium nitriding steel adopting EAF-CONVERTER electricity converter smelting+LF+VD+CCM, and concrete steps are,
(1) EAF-CONVERTER electricity converter smelting
Electric converter is loaded according to the weight ratio of 90% molten iron, 3% pig iron, 7% high-quality steel scrap, adopt catch carbon practice, forbid tap Molten Steel over-oxidation, go out composition of steel to meet 0.12%≤C≤0.20%, P≤0.010% and can tap, tapping temperature T >=1640 DEG C, tap controls at 83 ~ 87% of Intake Quantity, tapping process adds Al block and calcium carbide deoxidation, add silicomanganese, high carbon ferro-chrome and ferro-molybdenum, and add lime and the slag making of low silicon synthesis slag charge, tapping strictly controls remaining steel amount in stove latter stage, forbids slag of tapping;
(2) LF refining
LF refining uses Al grain and SiC to carry out deoxidation early stage, middle and later periods evenly flies away SiC to top of the slag deoxidation guarantor slag, keep reducing atmosphere, refining adjustment in early stage argon pressure to 0.4 ~ 0.6MPa, middle and later periods argon pressure is 0.2 ~ 0.35MPa, the front target content reaching each element except Al, Si for 10 minutes of refining bull ladle; Before before entering VD, feeding aluminum steel adjustment Al content reaches 0.100%, LF bull ladle, Si controls the lower limit at composition range, and refining time is 40 ~ 70 minutes, and bull ladle enters VD and carries out vacuum-treat;
(3) VD vacuum-treat
First carry out first time vacuum-treat, be evacuated to≤high vacuum of 67Pa after pressurize 10 minutes, require under high vacuum that obviously molten steel is exposed as seen to seethe, 8.5kg/t aluminium block is added after broken sky, be evacuated to again≤high vacuum of 67Pa after pressurize within 5 minutes, carry out second time vacuum-treat, aluminium block stirs through argon gas and dissolves and be uniformly distributed in molten steel, thus completes the aluminium alloying of molten steel; VD vacuum process returns silicon amount and controls in 0.03 ~ 0.05% scope; After the broken sky of second time, connect the first stove watering group and feed 80 meters of pure Ca lines, carry out inclusions class, guarantee to open the castability of watering stove, follow-up heat is forbidden to feed Ca line, and during to avoid line feeding, serious secondary oxidation occurs molten steel; Soft blow guarantees that in molten steel, inclusion fully floats;
(4) CCM continuous casting
Continuous casting even waters the first stove superheating temperature of heat and controls at 25 ~ 35 DEG C, and all the other even water heat superheating temperature and control at 15 ~ 25 DEG C, and permanent casting speed control is 0.70m/min; Casting process adopts alkaline covering agent, and large bag is lower adopts argon shield between the mouth of a river and long nozzle, and keeps the pressure-fired of 0.7 ~ 0.9pa; Employing Φ 45mm adds the heavy caliber mouth of a river, and high-aluminum steel mould flux.
2. the manufacture method of high alumina nitriding steel as claimed in claim 1, it is characterized in that: in step (1), total Intake Quantity of molten iron, the pig iron, high-quality steel scrap is 100 tons, and tapping process adds Al block 150kg, calcium carbide 150kg, lime 800kg, low silicon synthesis slag charge 300kg.
3. the manufacture method of high alumina nitriding steel as claimed in claim 1, is characterized in that: SiO in the low silicon synthesis slag charge described in step (1)
2mass content≤2.0%.
4. the manufacture method of high alumina nitriding steel as claimed in claim 1, is characterized in that: Al in the high-aluminum steel mould flux described in step (4)
2o
3mass content≤3.0%.
5. the manufacture method of high alumina nitriding steel as claimed in claim 1, is characterized in that: soft blow described in step (3) time >=35 minutes.
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Effective date of registration: 20190530 Address after: 213000 No. 1 Zhongwu Avenue, Changzhou City, Jiangsu Province Co-patentee after: Changzhou Bangyi Iron and Steel Co., Ltd. Patentee after: Zhongtian Iron Steel Group Co.,Ltd. Address before: 213011 beside 312 National Road, Yinshu Village, Yaoguan Town, Wujin District, Changzhou City, Jiangsu Province Patentee before: Zhongtian Iron Steel Group Co.,Ltd. |