CN104894473A - Shrunk-on vessel steel with thickness larger than or equal to 120 mm and production method of shrunk-on vessel steel - Google Patents
Shrunk-on vessel steel with thickness larger than or equal to 120 mm and production method of shrunk-on vessel steel Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 193
- 239000010959 steel Substances 0.000 title claims abstract description 193
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 239000000126 substance Substances 0.000 claims abstract description 47
- 238000005096 rolling process Methods 0.000 claims abstract description 45
- 238000003723 Smelting Methods 0.000 claims abstract description 43
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- 238000009749 continuous casting Methods 0.000 claims abstract description 13
- 239000002893 slag Substances 0.000 claims description 57
- 239000000203 mixture Substances 0.000 claims description 52
- XKRFYHLGVUSROY-UHFFFAOYSA-N argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 38
- 239000007788 liquid Substances 0.000 claims description 30
- 238000007670 refining Methods 0.000 claims description 26
- 239000000843 powder Substances 0.000 claims description 24
- 229910052786 argon Inorganic materials 0.000 claims description 19
- 238000010583 slow cooling Methods 0.000 claims description 19
- 238000010079 rubber tapping Methods 0.000 claims description 18
- 229910052717 sulfur Inorganic materials 0.000 claims description 17
- 238000007669 thermal treatment Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 12
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims description 12
- 229910052758 niobium Inorganic materials 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 229910052698 phosphorus Inorganic materials 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 230000001603 reducing Effects 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 8
- 241001062472 Stokellia anisodon Species 0.000 claims description 7
- 238000003801 milling Methods 0.000 claims description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 235000015450 Tilia cordata Nutrition 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000009933 burial Methods 0.000 claims description 6
- 239000011575 calcium Substances 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 6
- 230000001681 protective Effects 0.000 claims description 6
- 238000006722 reduction reaction Methods 0.000 claims description 6
- 238000007906 compression Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000010955 niobium Substances 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 238000004512 die casting Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000005864 Sulphur Substances 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 238000005242 forging Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910017083 AlN Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N al2o3 Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- PIGFYZPCRLYGLF-UHFFFAOYSA-N aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 238000005039 chemical industry Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000001808 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000005712 crystallization Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000003009 desulfurizing Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N silicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 210000001519 tissues Anatomy 0.000 description 1
Abstract
The invention discloses shrunk-on vessel steel with the thickness larger than or equal to 120 mm. The steel comprises chemical components in percentage by mass as follows: 0.13%-0.18% of C, 0.25%-0.50% of Si, 1.30%-1.60% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.005% of S, 0.020%-0.040% of Nb, 0.025%-0.050% of Alt and the balance of Fe and inevitable residual elements. The invention further discloses a production method of the shrunk-on vessel steel with the thickness larger than or equal to 120 mm. The components of the shrunk-on vessel steel are reasonable; with the adoption of an electroslag remelting smelting technology, the purity degree of a continuous casting billet is increased, the limitation of compression ratio of the continuous casting billet is eliminated, and the efficiency is higher; 4,300 mm rolling mill rolling and heat treatment are adopted, so that the shrunk-on vessel steel has good tensile property, impact property and Z-direction tensile property.
Description
Technical field
The present invention relates to pressure boiler and pressure vessel steel ultra-thick steel plates manufacturing technology, refer to hot jacket container steel and the production method thereof of a kind of thickness >=120mm particularly.
Background technology
Boiler and pressure vessel steel purposes are extremely wide, are widely used in the industries such as oil, chemical industry, power station, boiler, are generally used for and make reactor, heat exchanger, separator, airway, boiler-steam dome etc.Hot jacket tank plate is the grade of steel that in low-temperature pressure container, usage quantity is maximum, is widely used in and manufactures single laminate roll weldering container, integral multi-layered grip containers, multilayer binding vessel, hot jacket container and spherical vessel.Meanwhile, the demand manufacturing large substance super thick (the being greater than 100mm) steel plate that these large-scale plants use is also increasing, and for reducing the manufacturing cost of various device, these devices all trend towards maximizing; For improving the safe reliability of large-scale plant, require more and more stricter to the internal quality of steel plate used.From the mode that current special heavy plate is produced, except adopting original die casting, also has comparatively economic continuous metal cast process.But the restriction that continuous casting is produced by technical qualification cannot produce the excessive special heavy plate of thickness, revolving furnace continuous casting slab thickness maximum is in the world 390mm at present, due to the restriction of continuous-casting converter billet internal segregation and compression ratio, the special heavy plate that thickness is less than 100mm can only be produced, bring thus and use electric slag refusion and smelting explained hereafter continuous casting steel billet.Through the steel that electroslag furnace is smelted, have that purity is high, sulphur content is low, non-metallic inclusion is few, surface of steel ingot is smooth, the uniform advantage of crystallization even compact, metal structure and chemical composition.
Current domestic production is less more than the producer of 100mm thick pressurized vessel hot jacket container steel, and on domestic market, specification is the steel plate of 120mm, and because producer cannot ensure flaw detection, performance, apparent availability does not almost have; If dependence on import, not only price, and also receipt period is long, cannot ensure the normal operation of engineering.Therefore, the ultra thick gauge hot jacket pressure vessel steel producing qualified, the excellent performance of flaw detection realizes differentiation strategy to enterprise, strengthen enterprise competitiveness tool is of great significance.
Unresolved the problems referred to above, the Chinese invention patent of notification number CN102345054B discloses a kind of 120mm low-temperature pressure container 16MnDR slab and production method thereof, described slab comprises the chemical composition (unit: wt%) of following mass percent: C:0.10 ~ 0.17, Si:0.25 ~ 0.45, Mn:1.10 ~ 1.40, P≤0.015, S≤0.005, Als:0.015 ~ 0.055, Nb:0.015 ~ 0.04, Ti:0.010 ~ 0.020, and other is Fe and inevitable relict element.Carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15]≤0.40.Its production method is: by KR hot metal pretreatment, converter smelting, Argon process, LF refining, VD refining, die casting, heating, controlled rolling and controlled cooling, to hot and cold treatment process, on the basis ensureing 16MnDR composition, in strict control steel, P, S etc. affect the harmful element content of steel plate plasticity and toughness, the strict heating cycle controlling steel rolling simultaneously, finishing temperature, red temperature and speed of cooling is strictly controlled in the operation of rolling, adopt the methods such as steel plate stacking slow cooling, thus ensure that the property indices of 16MnDR steel grade 120mm thickness steel plate reaches standard-required.But the mode that make use of converter smelting and die casting cast in this patent is made steel, although ensure that large substance steel plate has enough draught and raw material of becoming a useful person, cannot ensure high purity, and die casting cast lumber recovery is lower, operating environment is also poor.
The Chinese invention patent application file of notification number CN102605241A discloses a kind of normalizing type 16MnDR steel plate of pressure vessel and manufacture method thereof, the chemical composition of steel plate is by mass percentage (unit: wt%): C:0.15 ~ 0.17, Si:0.25 ~ 0.40, Mn:1.4 ~ 1.55, P≤0.015, S≤0.005, V:0.05 ~ 0.07, Als:0.020 ~ 0.030, O≤0.0040, N≤0.0060, and surplus is Fe and inevitable impurity.Manufacture method is: to adopt through the pretreated molten iron of desulfurization and steel scrap as raw material, obtain normalizing type 16MnDR low-temperature pressure vessel steel plate through smelting, continuous casting, heating, rolling and the operation such as cooling, normalizing thermal treatment.Its advantage is: have good strong plasticity coupling, excellent low-temperature impact toughness, and production cost is lower, specification is controlled, and this steel plate is mainly used in the manufacture field of low-temperature pressure container equipment.But the steel plate thickness that the method is produced is only 10 ~ 60mm.
Therefore, a kind of method of producing the ultra thick gauge hot jacket pressure vessel steel of qualified, the excellent performance of flaw detection is provided to seem very necessary.
Summary of the invention
The object of the invention is to the weak point overcoming above-mentioned existing background technology, and hot jacket container steel and the production method thereof of a kind of thickness >=120mm are provided.
The object of the invention is to be reached by following measure: the hot jacket container steel of a kind of thickness >=120mm, in steel, chemical composition and mass percent are: C:0.13 ~ 0.18%, Si:0.25 ~ 0.50%, Mn:1.30 ~ 1.60%, P≤0.015%, S≤0.005%, Nb:0.020 ~ 0.040%, Alt:0.025 ~ 0.050%, and all the other are Fe and inevitable relict element.
Preferably, in steel, chemical composition and mass percent are: C:0.14 ~ 0.16%, Si:0.32 ~ 0.42%, Mn:1.34 ~ 1.43%, P≤0.01%, S≤0.004%, Nb:0.034 ~ 0.036%, Alt:0.04 ~ 0.045%, and all the other are Fe and inevitable relict element.
Again further, in steel, chemical composition and mass percent are: C:0.14%, Si:0.35%, Mn:1.34%, P:0.01%, S:0.004%, Nb:0.034%, Alt:0.04%, and all the other are Fe and inevitable relict element.
Main chemical elements and the effect of percentage composition in hot jacket container steel of the present invention thereof of the present invention's selection are as follows:
C: carbon is intensity element main in steel, increase the intensity that carbon can increase substantially steel, when content is more than 0.18%, the low-temperature flexibility of steel significantly worsens, and therefore controls 0.10 ~ 0.16%.
Si: silicon is the bioelement of deoxidation in steel making, also has certain strengthening effect, when content lower than 0.1 time, smelt difficulty strengthen; When content is more than 0.5%, the cleanliness factor of steel reduces, and toughness and welding property decline, and temper brittleness strengthens, and therefore controls 0.25 ~ 0.50%.
Mn: the lower change point reducing steel, increases the condensate depression of austenite cooling, refine pearlite tissue, and improves its mechanical property, can significantly improve the hardening capacity of steel, but during content height, by reducing the low-temperature flexibility of steel, therefore controls 1.0 ~ 1.55%.
Nb: niobium can significantly improve the austenite recrystallization temperature of steel, expands Unhydrated cement scope, is convenient to realize high temperature rolling.Niobium can also suppress Austenite Grain Growth, has refined crystalline strengthening and precipitation strength effect significantly.
Alt: the Holo-Al content in steel, can form AlN with N, can crystal grain thinning, and when it is containing quantity not sufficient 0.015%, poor effect, during more than 0.05%, desoxydatoin is tending towards saturated, increases steel inclusion.Therefore control 0.015 ~ 0.040%.
P: phosphoric increases temper brittleness and cold short susceptibility.
S: element sulphur increases the red brittleness of steel, during sulphur content height, unfavorable to welding property.
A production method for the hot jacket container steel of thickness >=120mm, comprises the steps:
1) converter smelting: enter stove molten steel according to the requirement of described chemical composition mass percent, strict control P≤0.015%, S≤0.005%, ensure the clarity of molten steel, molten steel proceeds to converter smelting, after converter smelting, tapping target control is: C:0.04 ~ 0.07%; P≤0.010%; Tapping temperature 1630 ~ 1650 DEG C;
2) LF refining: the molten steel after converter smelting is sent into refining in LF refining furnace, during refining, after power transmission temperature raising 3 ~ 5min, adds quickened lime according to 4.5 ~ 7.5Kg/ ton steel, add reductor according to 1.15 ~ 1.30Kg/ ton steel and carry out diffusive deoxidation; Sample after white slag, carry out presetting according to molten steel composition, except residual element, the mass percent of control Si is 0.30 ~ 0.40%, and other chemical composition is according to line traffic control in described chemical composition mass percent scope, and bull ladle enters RH stove;
3) RH stove vacuum-treat: after ladle enters RH stove, adjustment argon flow amount, control argon flow amount is 80 ~ 100ml/min, and make molten steel mask have obvious fluctuation, when vacuum tightness is down to 67Pa, carry out pressurize, vacuum is complete, broken empty after closing argon gas valve, thermometric;
4) Si ~ Ca line is fed according to 1.4 ~ 1.6 meters of/ton of steel;
5) soft blow: soft blow time controling is 8 ~ 15min;
6) continuous casting: controlling starting casting speed control is 1.5 ~ 1.9m/min, and obtain continuously cast bloom, Cross Section of CC Billet is 150mm × 1800mm, and length is 2500 ~ 4500mm;
7) cooling in heap, heap cool time is 24 ~ 48h;
8) electric slag refusion and smelting: continuously cast bloom adopts low frequency bipolar series plate blank electroslag furnace to smelt and stripping; The mass percent of control Si is 0.35 ~ 0.50%, and other chemical composition controls content according to described chemical composition mass percent;
A. get pre-melted slag according to 20 ~ 30Kg/ ton steel, and toast at the temperature of 1650 ~ 1750 DEG C, baking time 3 ~ 4h, pre-melted slag is dried; By carrying out of the pre-melted slag Slag treatment after oven dry, changing the slag time is 1.5 ~ 2h, and pre-melted slag changes into liquid state;
B. the continuously cast bloom by converter smelting is accessed electroslag furnace, form consumable electrode loop; And liquid pre-melted slag is loaded in the crystallizer of electroslag furnace; Carry out stripping;
C. when stripping speed control is at 7.5 ~ 8.5mm/min, carry out remelting, and add aluminum shot until remelting terminates according to 28 ~ 31g/min; In remelting, control non-metallic inclusion A, B, C, D type impurity total amount in molten steel and be no more than 1.0 grades; Wherein, A, B, C, D type impurity refers to sulfide, aluminum oxide, silicate, spherical oxide respectively; Control oxygen concn≤30ppm, nitrogen concentration≤70ppm;
D. pouring molten steel section is the electroslag base of 320 × 2000mm;
E., in the process of stripping, remelting and cast electroslag base, adopt protective guard to carry out slow cooling, after remelting terminates, electroslag base is fallen into burial pit and carries out slow cooling, the slow cooling time is for being not less than 48h.
9) heat: heating steps 8) the electroslag base that obtains;
10) controlled rolling: to step 9) in electroslag base be rolled;
11) cold-peace normalizing thermal treatment is controlled: carry out control cold-peace normalizing thermal treatment, namely obtain the hot jacket container steel of thickness >=120mm.
Preferably, step 2) in, reductor is made up of silicon calcium powder/ferrosilicon powder and AD15 reductor, and wherein, the weight ratio of silicon calcium powder/ferrosilicon powder and AD15 reductor is 1 ︰ 1 ~ 3.
Further, step 3) in, the dwell time is 15 ~ 25min, whole pumpdown time 25 ~ 35min.
Further, step 8) in, when the liquid steel level height in electroslag furnace reaches 70mm, start stripping, stripping speed control is at 4 ~ 5mm/min, and when the liquid steel level height in electroslag furnace reaches 70 ~ 75mm, stripping speed control is at 5 ~ 7mm/min; When the liquid steel level height in electroslag furnace reaches 80mm, stripping speed control is at 6.5 ~ 8.5mm/min.
Again further, step 9) in, Heating temperature is 1200 ~ 1240 DEG C, and heating rate is 8 ~ 12min/cm, and electroslag base tapping temperature is 1180 ~ 1220 DEG C.
Again further, step 10) in, the electroslag base after heating carries out two-stage control rolling on 4300mm milling train, first stage start rolling temperature 1100 ~ 1190 DEG C, subordinate phase start rolling temperature 870 ~ 900 DEG C, finishing temperature 840 ~ 870 DEG C; First stage rolling pass draught 20 ~ 35mm; The last three road total reductions of subordinate phase rolling are 30 ~ 50%, and final pass draft is 8 ~ 20%.
Again further, step 11) in, control cold rear steel plate red temperature and control to be 650 ~ 750 DEG C; Positive heat treat temperatures is 870 ~ 910 DEG C, and normalizing heat treatment time is 160 ~ 210min.
The invention has the advantages that:
One, hot jacket container steel component of the present invention is reasonable;
Its two, the present invention adopts the electric slag refusion and smelting technique of low frequency bipolar series plate blank electroslag furnace to improve the purity of continuously cast bloom thus to eliminate the restriction of Compression Ratio of Casting Billet, and the process efficiency producing ultra-thick plate than traditional forging, die casting etc. is higher;
Its three, the present invention adopts 4300mm milling train to be rolled and thermal treatment hot jacket container steel, makes hot jacket container steel have good tensile property, impact property and Z-direction tensile property;
Its four, adopt the inventive method can produce the hot jacket container steel of the thickness >=120mm of excellent performance, solve the thick hot jacket container steel of spy adopting the pattern of traditional converter smelting-rolling cannot produce more than 120mm; The inventive method can be produced in batches, and technique is simple, solves and adopts the mode forged to produce the special thick hot jacket tank plate problem that not only cost is high but also efficiency is extremely low of more than 120mm, and then improve product competitiveness.
Accompanying drawing explanation
Fig. 1 is the structure figure of the embodiment of the present invention 1 steel plate.
Embodiment
Describe performance of the present invention in detail below in conjunction with embodiment, but they do not form limitation of the invention, only for example.Simultaneously by illustrating that advantage of the present invention will become clearly and easy understand.
Embodiment 1
A hot jacket container steel of thickness >=120mm, in steel, chemical composition and mass percent are: C:0.14%, Si:0.35%, Mn:1.34%, P:0.010%, S:0.004%, Nb:0.034%, Alt:0.040%.
A production method for the hot jacket container steel of thickness >=120mm, comprises the steps:
1) converter smelting: enter stove molten steel according to the requirement of described chemical composition mass percent, strict control P≤0.015%, S≤0.005%, ensure the clarity of molten steel, molten steel proceeds to converter smelting, after converter smelting, tapping target control is: C:0.05%; P≤0.009%; Tapping temperature 1645 DEG C;
2) LF refining: the molten steel after converter smelting is sent into refining in LF refining furnace, during refining, after power transmission temperature raising 4min, adds quickened lime according to 6.5Kg/ ton steel, add reductor according to 1.25Kg/ ton steel and carry out diffusive deoxidation; Reductor is made up of silicon calcium powder/ferrosilicon powder and AD15 reductor, wherein, the weight ratio of silicon calcium powder/ferrosilicon powder and AD15 reductor is 1 ︰ 2, sample after white slag, carry out presetting according to molten steel composition, except residual element, the mass percent of control Si is 0.40%, other chemical composition is according to line traffic control in described chemical composition mass percent scope, and bull ladle enters RH stove;
3) RH stove vacuum-treat: after ladle enters RH stove, adjustment argon flow amount, control argon flow amount is 90ml/min, make molten steel mask have obvious fluctuation, when vacuum tightness is down to 67Pa, carry out pressurize, the dwell time is 20min, whole pumpdown time 30min, vacuum is complete, broken empty after closing argon gas valve, thermometric;
4) Si ~ Ca line is fed according to 1.5 meters of/ton of steel;
5) soft blow: soft blow time controling is 10min;
6) continuous casting: controlling starting casting speed control is 1.8m/min, and obtain continuously cast bloom, Cross Section of CC Billet is 150mm × 1800mm, and length is 3000mm;
7) cooling in heap, heap cool time is 40h;
8) electric slag refusion and smelting: continuously cast bloom adopts low frequency bipolar series plate blank electroslag furnace to smelt and stripping; The mass percent of control Si is 0.50%, and other chemical composition controls content according to described chemical composition mass percent;
A. get pre-melted slag according to 25Kg/ ton steel, and toast at the temperature of 1700 DEG C, baking time 3.5h, pre-melted slag is dried; By carrying out of the pre-melted slag Slag treatment after oven dry, changing the slag time is 1.8h, and pre-melted slag changes into liquid state;
B. the continuously cast bloom by converter smelting is accessed electroslag furnace, form consumable electrode loop; And liquid pre-melted slag is loaded in the crystallizer of electroslag furnace; Carry out stripping; When the liquid steel level height in electroslag furnace reaches 70mm, start stripping, stripping speed control is at 4.5mm/min, and when the liquid steel level height in electroslag furnace reaches 70 ~ 75mm, stripping speed control is at 6mm/min; When the liquid steel level height in electroslag furnace reaches 80mm, stripping speed control is at 7mm/min;
C. when stripping speed control is at 7.5 ~ 8.5mm/min, carry out remelting, and add aluminum shot until remelting terminates according to 30g/min; In remelting, control non-metallic inclusion A, B, C, D type impurity total amount in molten steel and be no more than 1.0 grades; Control oxygen concn≤30ppm, nitrogen concentration≤70ppm;
D. pouring molten steel section is the electroslag base of 320 × 2000mm;
E., in the process of stripping, remelting and cast electroslag base, adopt protective guard to carry out slow cooling, after remelting terminates, electroslag base is fallen into burial pit and carries out slow cooling, the slow cooling time is for being not less than 48h.
9) heat: heating steps 8) the electroslag base that obtains; Heating temperature is 1220 DEG C, and heating rate is 10min/cm, and electroslag base tapping temperature is 1200 DEG C.
10) controlled rolling: to step 9) in electroslag base be rolled; Electroslag base after heating carries out two-stage control rolling on 4300mm milling train, first stage start rolling temperature 1150 DEG C, subordinate phase start rolling temperature 890 DEG C, finishing temperature 860 DEG C; First stage rolling pass draught 30mm; The last three road total reductions of subordinate phase rolling are 40%, and final pass draft is 10%.
11) cold-peace normalizing thermal treatment is controlled: carry out control cold-peace normalizing thermal treatment, namely obtain the hot jacket container steel of thickness >=120mm.Control cold rear steel plate red temperature to control to be 700 DEG C; Positive heat treat temperatures is 900 DEG C, and normalizing heat treatment time is 200min.
Embodiment 2
The hot jacket container steel of a kind of thickness >=120mm, in steel, chemical composition and mass percent are: C:0.16%, Si:0.42%, Mn:1.43%, P:0.010%, S:0.004%, Nb:0.036%, Alt:0.045%, and all the other are Fe and inevitable relict element.
A production method for the hot jacket container steel of thickness >=120mm, comprises the steps:
1) converter smelting: enter stove molten steel according to the requirement of described chemical composition mass percent, strict control P≤0.015%, S≤0.005%, ensure the clarity of molten steel, molten steel proceeds to converter smelting, after converter smelting, tapping target control is: C:0.06%; P≤0.008%; Tapping temperature 1630 ~ 1650 DEG C;
2) LF refining: the molten steel after converter smelting is sent into refining in LF refining furnace, during refining, after power transmission temperature raising 4min, adds quickened lime according to 7Kg/ ton steel, add reductor according to 1.20Kg/ ton steel and carry out diffusive deoxidation; Reductor is made up of silicon calcium powder/ferrosilicon powder and AD15 reductor, wherein, the weight ratio of silicon calcium powder/ferrosilicon powder and AD15 reductor is 1 ︰ 2.5, sample after white slag, carry out presetting according to molten steel composition, except residual element, the mass percent of control Si is 0.35%, other chemical composition is according to line traffic control in described chemical composition mass percent scope, and bull ladle enters RH stove;
3) RH stove vacuum-treat: after ladle enters RH stove, adjustment argon flow amount, control argon flow amount is 95ml/min, make molten steel mask have obvious fluctuation, when vacuum tightness is down to 67Pa, carry out pressurize, the dwell time is 18min, whole pumpdown time 29min, vacuum is complete, broken empty after closing argon gas valve, thermometric;
4) Si ~ Ca line is fed according to 1.5 meters of/ton of steel;
5) soft blow: soft blow time controling is 8min;
6) continuous casting: controlling starting casting speed control is 1.5m/min, and obtain continuously cast bloom, Cross Section of CC Billet is 150mm × 1800mm, and length is 2500mm;
7) cooling in heap, heap cool time is 24h;
8) electric slag refusion and smelting: continuously cast bloom adopts low frequency bipolar series plate blank electroslag furnace to smelt and stripping; The mass percent of control Si is 0.35%, and other chemical composition controls content according to described chemical composition mass percent;
A. get pre-melted slag according to 20Kg/ ton steel, and toast at the temperature of 1650 DEG C, baking time 3h, pre-melted slag is dried; By carrying out of the pre-melted slag Slag treatment after oven dry, changing the slag time is 1.5h, and pre-melted slag changes into liquid state;
B. the continuously cast bloom by converter smelting is accessed electroslag furnace, form consumable electrode loop; And liquid pre-melted slag is loaded in the crystallizer of electroslag furnace; Carry out stripping; When the liquid steel level height in electroslag furnace reaches 70mm, start stripping, stripping speed control is at 4mm/min, and when the liquid steel level height in electroslag furnace reaches 70 ~ 75mm, stripping speed control is at 5mm/min; When the liquid steel level height in electroslag furnace reaches 80mm, stripping speed control is at 6.5mm/min;
C. when stripping speed control is at 7.5 ~ 8.5mm/min, carry out remelting, and add aluminum shot until remelting terminates according to 28g/min; In remelting, control non-metallic inclusion A, B, C, D type impurity total amount in molten steel and be no more than 1.0 grades; Control oxygen concn≤30ppm, nitrogen concentration≤70ppm;
D. pouring molten steel section is the electroslag base of 320 × 2000mm;
E., in the process of stripping, remelting and cast electroslag base, adopt protective guard to carry out slow cooling, after remelting terminates, electroslag base is fallen into burial pit and carries out slow cooling, the slow cooling time is for being not less than 48h.
9) heat: heating steps 8) the electroslag base that obtains; Heating temperature is 1200 DEG C, and heating rate is 8min/cm, and electroslag base tapping temperature is 1180 DEG C.
10) controlled rolling: to step 9) in electroslag base be rolled; Electroslag base after heating carries out two-stage control rolling on 4300mm milling train, first stage start rolling temperature 1100 DEG C, subordinate phase start rolling temperature 870 DEG C, finishing temperature 840 DEG C; First stage rolling pass draught 20mm; The last three road total reductions of subordinate phase rolling are 30%, and final pass draft is 8%.
11) cold-peace normalizing thermal treatment is controlled: carry out control cold-peace normalizing thermal treatment, namely obtain the hot jacket container steel of thickness >=120mm.Control cold rear steel plate red temperature to control to be 650 DEG C; Positive heat treat temperatures is 870 DEG C, and normalizing heat treatment time is 160min.
Embodiment 3
The hot jacket container steel of a kind of thickness >=120mm, in steel, chemical composition and mass percent are: C:0.13%, Si:0.27%, Mn:1.31%, P:0.015%, S:0.005%, Nb:0.022%, Alt:0.050%, and all the other are Fe and inevitable relict element.
A production method for the hot jacket container steel of thickness >=120mm, comprises the steps:
1) converter smelting: enter stove molten steel according to the requirement of described chemical composition mass percent, strict control P≤0.015%, S≤0.005%, ensure the clarity of molten steel, molten steel proceeds to converter smelting, after converter smelting, tapping target control is: C:0.04%; P≤0.010%; Tapping temperature 1630 DEG C;
2) LF refining: the molten steel after converter smelting is sent into refining in LF refining furnace, during refining, after power transmission temperature raising 3min, adds quickened lime according to 4.5Kg/ ton steel, add reductor according to 1.15Kg/ ton steel and carry out diffusive deoxidation; Reductor is made up of silicon calcium powder/ferrosilicon powder and AD15 reductor, wherein, the weight ratio of silicon calcium powder/ferrosilicon powder and AD15 reductor is 1 ︰ 3, sample after white slag, carry out presetting according to molten steel composition, except residual element, the mass percent of control Si is 0.40%, other chemical composition is according to line traffic control in described chemical composition mass percent scope, and bull ladle enters RH stove;
3) RH stove vacuum-treat: after ladle enters RH stove, adjustment argon flow amount, control argon flow amount is 100ml/min, make molten steel mask have obvious fluctuation, when vacuum tightness is down to 67Pa, carry out pressurize, the dwell time is 25min, whole pumpdown time 35min, vacuum is complete, broken empty after closing argon gas valve, thermometric;
4) Si ~ Ca line is fed according to 1.6 meters of/ton of steel;
5) soft blow: soft blow time controling is 15min;
6) continuous casting: controlling starting casting speed control is 1.9m/min, and obtain continuously cast bloom, Cross Section of CC Billet is 150mm × 1800mm, and length is 4500mm;
7) cooling in heap, heap cool time is 48h;
8) electric slag refusion and smelting: continuously cast bloom adopts low frequency bipolar series plate blank electroslag furnace to smelt and stripping; The mass percent of control Si is 0.50%, and other chemical composition controls content according to described chemical composition mass percent;
A. get pre-melted slag according to 30Kg/ ton steel, and toast at the temperature of 1750 DEG C, baking time 4h, pre-melted slag is dried; By carrying out of the pre-melted slag Slag treatment after oven dry, changing the slag time is 2h, and pre-melted slag changes into liquid state;
B. the continuously cast bloom by converter smelting is accessed electroslag furnace, form consumable electrode loop; And liquid pre-melted slag is loaded in the crystallizer of electroslag furnace; Carry out stripping; When the liquid steel level height in electroslag furnace reaches 70mm, start stripping, stripping speed control is at 5mm/min, and when the liquid steel level height in electroslag furnace reaches 70 ~ 75mm, stripping speed control is at 7mm/min; When the liquid steel level height in electroslag furnace reaches 80mm, stripping speed control is at 8.5mm/min;
C. when stripping speed control is at 7.5 ~ 8.5mm/min, carry out remelting, and add aluminum shot until remelting terminates according to 31g/min; In remelting, control non-metallic inclusion A, B, C, D type impurity total amount in molten steel and be no more than 1.0 grades; Control oxygen concn≤30ppm, nitrogen concentration≤70ppm;
D. pouring molten steel section is the electroslag base of 320 × 2000mm;
E., in the process of stripping, remelting and cast electroslag base, adopt protective guard to carry out slow cooling, after remelting terminates, electroslag base is fallen into burial pit and carries out slow cooling, the slow cooling time is for being not less than 48h.
9) heat: heating steps 8) the electroslag base that obtains; Heating temperature is 1240 DEG C, and heating rate is 12min/cm, and electroslag base tapping temperature is 1220 DEG C.
10) controlled rolling: to step 9) in electroslag base be rolled; Electroslag base after heating carries out two-stage control rolling on 4300mm milling train, first stage start rolling temperature 1190 DEG C, subordinate phase start rolling temperature 900 DEG C, finishing temperature 870 DEG C; First stage rolling pass draught 35mm; The last three road total reductions of subordinate phase rolling are 50%, and final pass draft is 20%.
11) cold-peace normalizing thermal treatment is controlled: carry out control cold-peace normalizing thermal treatment, namely obtain the hot jacket container steel of thickness >=120mm.Control cold rear steel plate red temperature to control to be 750 DEG C; Positive heat treat temperatures is 910 DEG C, and normalizing heat treatment time is 210min.
Embodiment 4
The hot jacket container steel of a kind of thickness >=120mm, in steel, chemical composition and mass percent are: C:0.18%, Si:0.50%, Mn:1.6%, P:0.010%, S:0.004%, Nb:0.040%, Alt:0.025%, and all the other are Fe and inevitable relict element.
A production method for the hot jacket container steel of thickness >=120mm, comprises the steps:
1) converter smelting: enter stove molten steel according to the requirement of described chemical composition mass percent, strict control P≤0.015%, S≤0.005%, ensure the clarity of molten steel, molten steel proceeds to converter smelting, after converter smelting, tapping target control is: C:0.07%; P≤0.004%; Tapping temperature 1650 DEG C;
2) LF refining: the molten steel after converter smelting is sent into refining in LF refining furnace, during refining, after power transmission temperature raising 5min, adds quickened lime according to 7.5Kg/ ton steel, add reductor according to 1.30Kg/ ton steel and carry out diffusive deoxidation; Reductor is made up of silicon calcium powder/ferrosilicon powder and AD15 reductor, wherein, the weight ratio of silicon calcium powder/ferrosilicon powder and AD15 reductor is 1 ︰ 1, sample after white slag, carry out presetting according to molten steel composition, except residual element, the mass percent of control Si is 0.30%, other chemical composition is according to line traffic control in described chemical composition mass percent scope, and bull ladle enters RH stove;
3) RH stove vacuum-treat: after ladle enters RH stove, adjustment argon flow amount, control argon flow amount is 80ml/min, make molten steel mask have obvious fluctuation, when vacuum tightness is down to 67Pa, carry out pressurize, the dwell time is 15min, whole pumpdown time 25min, vacuum is complete, broken empty after closing argon gas valve, thermometric;
4) Si ~ Ca line is fed according to 1.4 meters of/ton of steel;
5) soft blow: soft blow time controling is 8min;
6) continuous casting: controlling starting casting speed control is 1.5m/min, and obtain continuously cast bloom, Cross Section of CC Billet is 150mm × 1800mm, and length is 2500mm;
7) cooling in heap, heap cool time is 24h;
8) electric slag refusion and smelting: continuously cast bloom adopts low frequency bipolar series plate blank electroslag furnace to smelt and stripping; The mass percent of control Si is 0.35%, and other chemical composition controls content according to described chemical composition mass percent;
A. get pre-melted slag according to 20Kg/ ton steel, and toast at the temperature of 1650 DEG C, baking time 3h, pre-melted slag is dried; By carrying out of the pre-melted slag Slag treatment after oven dry, changing the slag time is 1.5h, and pre-melted slag changes into liquid state;
B. the continuously cast bloom by converter smelting is accessed electroslag furnace, form consumable electrode loop; And liquid pre-melted slag is loaded in the crystallizer of electroslag furnace; Carry out stripping; When the liquid steel level height in electroslag furnace reaches 70mm, start stripping, stripping speed control is at 4mm/min, and when the liquid steel level height in electroslag furnace reaches 70 ~ 75mm, stripping speed control is at 5mm/min; When the liquid steel level height in electroslag furnace reaches 80mm, stripping speed control is at 6.5mm/min;
C. when stripping speed control is at 7.5 ~ 8.5mm/min, carry out remelting, and add aluminum shot until remelting terminates according to 28g/min; In remelting, control non-metallic inclusion A, B, C, D type impurity total amount in molten steel and be no more than 1.0 grades; Control oxygen concn≤30ppm, nitrogen concentration≤70ppm;
D. pouring molten steel section is the electroslag base of 320 × 2000mm;
E., in the process of stripping, remelting and cast electroslag base, adopt protective guard to carry out slow cooling, after remelting terminates, electroslag base is fallen into burial pit and carries out slow cooling, the slow cooling time is for being not less than 48h.
9) heat: heating steps 8) the electroslag base that obtains; Heating temperature is 1200 DEG C, and heating rate is 8min/cm, and electroslag base tapping temperature is 1180 DEG C.
10) controlled rolling: to step 9) in electroslag base be rolled; Electroslag base after heating carries out two-stage control rolling on 4300mm milling train, first stage start rolling temperature 1100 DEG C, subordinate phase start rolling temperature 870 DEG C, finishing temperature 840 DEG C; First stage rolling pass draught 20mm; The last three road total reductions of subordinate phase rolling are 30%, and final pass draft is 8%.
11) cold-peace normalizing thermal treatment is controlled: carry out control cold-peace normalizing thermal treatment, namely obtain the hot jacket container steel of thickness >=120mm.Control cold rear steel plate red temperature to control to be 650 DEG C; Positive heat treat temperatures is 870 DEG C, and normalizing heat treatment time is 160min.
Interpretation of result
To the gentle bulk concentration result of embodiment electroslag base inner clamps foreign material, concrete outcome is as shown in table 1.
The gentle bulk concentration result of table 1 electroslag base inner clamps foreign material
Carried out mechanical property and carrying out flaw detection to embodiment hot jacket container steel, concrete outcome is as shown in table 2 and table 3.
Table 2 mechanical properties test and result of detection
Table 3 Z-direction tensile property
Steel plate of the present invention utilizes the container steel chemical composition design of standard, adopt the electric slag refusion and smelting technique of low frequency bipolar series plate blank electroslag furnace to improve the purity of continuously cast bloom thus to eliminate the restriction of Compression Ratio of Casting Billet, higher than the process efficiency of the production ultra-thick plates such as traditional forging, die casting; Follow-up again by the rolling of 4300mm wide and heavy plate mill and thermal treatment, produce thickness >=120mm hot jacket container steel, there is good tensile property, impact property and Z-direction tensile property.The steel plate homogeneous microstructure of production can be found out from the structure figure of the embodiment of the present invention 1 steel plate.
Other is prior art without the part described in detail.
Claims (10)
1. the hot jacket container steel of thickness >=120mm, it is characterized in that: in steel, chemical composition and mass percent are: C:0.13 ~ 0.18%, Si:0.25 ~ 0.50%, Mn:1.30 ~ 1.60%, P≤0.015%, S≤0.005%, Nb:0.020 ~ 0.040%, Alt:0.025 ~ 0.050%, all the other are Fe and inevitable relict element.
2. the hot jacket container steel of thickness >=120mm according to claim 1, it is characterized in that: in steel, chemical composition and mass percent are: C:0.14 ~ 0.16%, Si:0.32 ~ 0.42%, Mn:1.34 ~ 1.43%, P≤0.01%, S≤0.004%, Nb:0.034 ~ 0.036%, Alt:0.04 ~ 0.045%, all the other are Fe and inevitable relict element.
3. the hot jacket container steel of thickness >=120mm according to claim 1, it is characterized in that: in steel, chemical composition and mass percent are: C:0.14%, Si:0.35%, Mn:1.34%, P:0.01%, S:0.004%, Nb:0.034%, Alt:0.04%, all the other are Fe and inevitable relict element.
4. a production method for the hot jacket container steel of thickness >=120mm according to claim 1, is characterized in that: comprise the steps:
1) converter smelting: enter stove molten steel according to the requirement of described chemical composition mass percent, strict control P≤0.015%, S≤0.005%, ensure the clarity of molten steel, molten steel proceeds to converter smelting, after converter smelting, tapping target control is: C:0.04 ~ 0.07%; P≤0.010%; Tapping temperature 1630 ~ 1650 DEG C;
2) LF refining: the molten steel after converter smelting is sent into refining in LF refining furnace, during refining, after power transmission temperature raising 3 ~ 5min, adds quickened lime according to 4.5 ~ 7.5Kg/ ton steel, add reductor according to 1.15 ~ 1.30Kg/ ton steel and carry out diffusive deoxidation; Sample after white slag, carry out presetting according to molten steel composition, except residual element, the mass percent of control Si is 0.30 ~ 0.40%, and other chemical composition is according to line traffic control in described chemical composition mass percent scope, and bull ladle enters RH stove;
3) RH stove vacuum-treat: after ladle enters RH stove, adjustment argon flow amount, control argon flow amount is 80 ~ 100ml/min, and make molten steel mask have obvious fluctuation, when vacuum tightness is down to 67Pa, carry out pressurize, vacuum is complete, broken empty after closing argon gas valve, thermometric;
4) Si ~ Ca line is fed according to 1.4 ~ 1.6 meters of/ton of steel;
5) soft blow: soft blow time controling is 8 ~ 15min;
6) continuous casting: controlling starting casting speed control is 1.5 ~ 1.9m/min, and obtain continuously cast bloom, Cross Section of CC Billet is 150mm × 1800mm, and length is 2500 ~ 4500mm;
7) cooling in heap, heap cool time is 24 ~ 48h;
8) electric slag refusion and smelting: continuously cast bloom adopts low frequency bipolar series plate blank electroslag furnace to smelt and stripping; The mass percent of control Si is 0.35 ~ 0.50%, and other chemical composition controls content according to described chemical composition mass percent;
A. get pre-melted slag according to 20 ~ 30Kg/ ton steel, and toast at the temperature of 1650 ~ 1750 DEG C, baking time 3 ~ 4h, pre-melted slag is dried; By carrying out of the pre-melted slag Slag treatment after oven dry, changing the slag time is 1.5 ~ 2h, and pre-melted slag changes into liquid state;
B. the continuously cast bloom by converter smelting is accessed electroslag furnace, form consumable electrode loop; And liquid pre-melted slag is loaded in the crystallizer of electroslag furnace; Carry out stripping;
C. when stripping speed control is at 7.5 ~ 8.5mm/min, carry out remelting, and add aluminum shot until remelting terminates according to 28 ~ 31g/min; In remelting, control non-metallic inclusion A, B, C, D type impurity total amount in molten steel and be no more than 1.0 grades; Control oxygen concn≤30ppm, nitrogen concentration≤70ppm;
D. pouring molten steel section is the electroslag base of 320 × 2000mm;
E., in the process of stripping, remelting and cast electroslag base, adopt protective guard to carry out slow cooling, after remelting terminates, electroslag base is fallen into burial pit and carries out slow cooling, the slow cooling time is for being not less than 48h.
9) heat: heating steps 8) the electroslag base that obtains;
10) controlled rolling: to step 9) in electroslag base be rolled;
11) cold-peace normalizing thermal treatment is controlled: carry out control cold-peace normalizing thermal treatment, namely obtain the hot jacket container steel of thickness >=120mm.
5. the production method of the hot jacket container steel of thickness >=120mm according to claim 4, it is characterized in that: described step 2) in, reductor is made up of silicon calcium powder/ferrosilicon powder and AD15 reductor, and wherein, the weight ratio of silicon calcium powder/ferrosilicon powder and AD15 reductor is 1 ︰ 1 ~ 3.
6. the production method of the hot jacket container steel of thickness >=120mm according to claim 5, is characterized in that: described step 3) in, the dwell time is 15 ~ 25min, whole pumpdown time 25 ~ 35min.
7. the production method of the hot jacket container steel of thickness >=120mm according to claim 6, it is characterized in that: described step 8) in, when the liquid steel level height in electroslag furnace reaches 70mm, start stripping, stripping speed control is at 4 ~ 5mm/min, when the liquid steel level height in electroslag furnace reaches 70 ~ 75mm, stripping speed control is at 5 ~ 7mm/min; When the liquid steel level height in electroslag furnace reaches 80mm, stripping speed control is at 6.5 ~ 8.5mm/min.
8. the production method of the hot jacket container steel of thickness >=120mm according to claim 7, is characterized in that: described step 9) in, Heating temperature is 1200 ~ 1240 DEG C, and heating rate is 8 ~ 12min/cm, and electroslag base tapping temperature is 1180 ~ 1220 DEG C.
9. the production method of the hot jacket container steel of thickness >=120mm according to claim 8, it is characterized in that: described step 10) in, electroslag base after heating carries out two-stage control rolling on 4300mm milling train, first stage start rolling temperature 1100 ~ 1190 DEG C, subordinate phase start rolling temperature 870 ~ 900 DEG C, finishing temperature 840 ~ 870 DEG C; First stage rolling pass draught 20 ~ 35mm; The last three road total reductions of subordinate phase rolling are 30 ~ 50%, and final pass draft is 8 ~ 20%.
10. the production method of the hot jacket container steel of thickness >=120mm according to claim 9, is characterized in that: described step 11) in, control cold rear steel plate red temperature and control to be 650 ~ 750 DEG C; Positive heat treat temperatures is 870 ~ 910 DEG C, and normalizing heat treatment time is 160 ~ 210min.
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| CN108251763A (en) * | 2018-03-22 | 2018-07-06 | 江苏大学 | A kind of bullet train brake disc steel and preparation method thereof |
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