CN102766748A - Production method of low-temperature steel plate capable of being welded at high heat input - Google Patents
Production method of low-temperature steel plate capable of being welded at high heat input Download PDFInfo
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- CN102766748A CN102766748A CN201210284441XA CN201210284441A CN102766748A CN 102766748 A CN102766748 A CN 102766748A CN 201210284441X A CN201210284441X A CN 201210284441XA CN 201210284441 A CN201210284441 A CN 201210284441A CN 102766748 A CN102766748 A CN 102766748A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 95
- 239000010959 steel Substances 0.000 title claims abstract description 95
- 238000004519 manufacturing process Methods 0.000 title abstract description 5
- 238000003466 welding Methods 0.000 claims abstract description 31
- 238000005096 rolling process Methods 0.000 claims abstract description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 22
- 239000001301 oxygen Substances 0.000 claims abstract description 22
- 238000009749 continuous casting Methods 0.000 claims abstract description 20
- 238000007670 refining Methods 0.000 claims abstract description 20
- 238000003723 Smelting Methods 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 229910052742 iron Inorganic materials 0.000 claims abstract description 12
- 239000002893 slag Substances 0.000 claims abstract description 10
- 229910000861 Mg alloy Inorganic materials 0.000 claims abstract description 7
- 229910000882 Ca alloy Inorganic materials 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 26
- 238000010079 rubber tapping Methods 0.000 claims description 14
- 238000005516 engineering process Methods 0.000 claims description 10
- 229910052796 boron Inorganic materials 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 6
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 239000011575 calcium Substances 0.000 claims description 6
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 238000007664 blowing Methods 0.000 claims description 2
- 238000007872 degassing Methods 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 4
- 229910001200 Ferrotitanium Inorganic materials 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 16
- 239000000463 material Substances 0.000 description 8
- 239000004411 aluminium Substances 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 230000000994 depressogenic effect Effects 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 239000011777 magnesium Substances 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000009628 steelmaking Methods 0.000 description 4
- 238000009966 trimming Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005275 alloying Methods 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- SXSVTGQIXJXKJR-UHFFFAOYSA-N [Mg].[Ti] Chemical compound [Mg].[Ti] SXSVTGQIXJXKJR-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 241001417490 Sillaginidae Species 0.000 description 1
- JTCFNJXQEFODHE-UHFFFAOYSA-N [Ca].[Ti] Chemical compound [Ca].[Ti] JTCFNJXQEFODHE-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 241000894007 species Species 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
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- 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
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- Continuous Casting (AREA)
Abstract
The invention relates to a production method of a low-temperature steel plate capable of being welded by large heat input, which comprises the following steps: molten iron pretreatment → combined blown converter smelting → LF refining → RH refining → wire feeding → continuous casting, the LF refining produces white slag, ferrotitanium is added at an RH station, after the temperature of molten steel reaches 1570-1600 ℃ and the content of dissolved oxygen in the molten steel reaches 20-80 ppm, the hollow is broken, 200-400 m magnesium alloy or calcium alloy core-spun wire is fed into the molten steel at the speed of 4-6 m/s, continuous casting is carried out to obtain a continuous casting billet, and after the continuous casting billet is heated and insulated, rolling and cooling are controlled to obtain the low-temperature steel plate capable of being welded under high heat input. The steel plate has excellent low-temperature toughness, the-80 ℃ Charpy impact energy is more than 47J, the-60 ℃ Charpy impact energy of a heat affected zone after welding with the heat input of 500-600 kJ/cm is more than 47J, and the steel plate can be widely applied to the field of energy construction engineering of ships, low-temperature pressure vessels, ocean platforms and the like.
Description
Technical field
The invention belongs to the excellent low-temperature steel plate of welding property and make the field, be specifically related to a kind of working method of low temperature steel plate of the input of heat greatly welding.
Background technology
Because improving constantly of energy demand, fields such as shipbuilding, bridge, natural gas line, ocean platform also improve constantly the demand of low-temperature steel; Employing can big hot input, and (>=200kJ/cm) welding steel can significantly improve welding efficiency, shortens production cycle, reduce cost, and therefore, low-temperature steel that can big hot input welding has obtained widespread use in the energy construction field.
The steel plate of can the be big hot input welding of industrialized production generally includes molten steel and smelts and finished product steel plate rolling operations such as (perhaps comprising thermal treatment).Molten steel is smelted the technical process of adopting usually: hot metal pretreatment → converter smelting; Add aluminium block in the converter tapping process molten steel is carried out deep deoxidation → LF refining; Carrying out alloying element adds and fine setting → RH vacuum-treat; Purify hot metal → continuous casting, and be met the continuously cast bloom of follow-up rolling requirement.Prior art (is opened 2007-293648 like the spy; The spy opens 2007-235974; CN100519809C; CN100447278C) relate to strong oxide compound forming elements such as in the LF refining process, adding Ti/Ca/Zr/Mg/REM, purpose is the fine oxide particle that in molten steel, forms evenly, gathers, thereby utilizes these oxide particle pinning crystal boundaries to suppress austenite crystal growing up under hot environment then; Thereby improve the low temperature impact properties of welded heat affecting zone, and reach the purpose of the welding property that improves steel plate.But there is following shortcoming in above-mentioned technology:
1) do not study most important several processing parameters in this technology like the alloy species that adds, the mode that alloy adds, the order that alloy adds, the opportunity (being the liquid steel temperature before alloy adds, the dissolved oxygen content in the molten steel) that alloy adds etc.; Above-mentioned processing parameter has directly determined kind, size and the area density of the oxide compound of final formation, and then has directly determined the welding property of final steel panel products.
2) converter tapping adopts and adds the aluminium block deep deoxidation, can in molten steel, introduce a certain amount of solid solution aluminium like this; Because aluminium is strong deoxidant element; And with the avidity of oxygen greater than other alloying element; Therefore the existence of aluminium has had a strong impact on the chemical reaction that adds strong reductor and molten steel in the molten steel; Causing in molten steel, generating larger-size aluminum oxide is main composite oxides with the aluminum oxide perhaps, has lost the purpose that improves the steel plate welding property through the pinning austenite grain boundary.
Other a kind of path of improving welding property is between RH processing and continuous casting, to increase the process of feeding silicon-calcium wire; Its principle is through accurate control Ca, S and dissolving O content and mutual ratio; In molten steel, form some amount and be sulfide, oxide compound and the composite oxygen sulfide particles that disperse distributes (spy open 2004-176100, spy open 2004-10951, spy open 2003-286540, spy and open that 2005-220379, spy open 2005-68478, the spy opens 2010-77494, CN101545077B); These tiny densely covered particles are through hindering the crystal boundary motion, suppress austenite growing up at high temperature, thereby improve the welding property of final steel plate.But owing to need a certain amount of S,, worsen toughness in should technology so cause sulfide thick easily.
Summary of the invention
The working method that the purpose of this invention is to provide a kind of input of heat greatly welding low temperature steel plate.According to the steel plate-80 ℃ impelling strength excellence of this explained hereafter (Akv-80 ℃>47J), under the condition of welding heat input up to 500～600kJ/cm, can guarantee its welded heat affecting zone satisfy-60 ℃ of impelling strength require (Akv-60 ℃＞47J).Make single pass can accomplish the welding of 50mm and following thickness specification steel plate, improved welding efficiency greatly, can satisfy the demand of structural steels such as cold district boats and ships, ocean platform, when guaranteeing structural safety, can increase substantially efficiency of construction.
For realizing the foregoing invention purpose, the present invention has adopted following technical scheme:
The molten steel smelting procedure is following: hot metal pretreatment → combined blown converter smelting → LF refining → RH refining → hello silk → continuous casting.The target of hot metal pretreatment is: the temperature of molten iron>=1350 ℃, S≤0.003% by weight percentage, the rate of skimming>=95%.In the converter steelmaking process, shove charge is greater than 7 with the ratio of iron water amount and steel scrap, and the basicity of slag is controlled between 3.5～4.5, and MgO is controlled at 8.0～10.0%; Carry out the steel ladle bottom argon blowing gas shiled before the converter tapping, converter tapping accounts for converter total volume 10～20% and o'clock adds ferromanganese, ferrosilicon, lime successively, without the aluminium block deoxidation.The LF refining process is made white slag, simultaneously molten steel is carried out deciding oxygen, and adding ferro-boron, diffusive deoxidation also got molten steel appearance and carried out trimming, and tapping temperature is between 1610～1640 ℃.In the RH vacuum-treat stage, degassing time >=10 minute add ferrotianium behind the oxygen determination after the molten steel dissolved oxygen satisfies 10～100ppm; After alloying finishes; Behind clean cycling time >=5 minute, and broken more empty after 1570～1600 ℃ of liquid steel temperatures satisfy with dissolved oxygen content 20～80ppm simultaneously, brokenly in molten steel, feed the magnesiumalloy or the calcium alloy cored-wire of 200～400 meters length with the speed of 4～6 meter per seconds after empty; The cored-wire diameter is 10～14mm, guarantees to be not less than 5 minutes soft churning time then.Before ladle hangs, add ultralow carbonization rice husk thermal insulation.Pouring temperature is 1570～1590 ℃, and the continuously cast bloom pulling rate is 1.0～1.4 meter per seconds, makes continuous casting material.
The continuously cast bloom composition (weight percent) that obtains is: C≤0.07%, Si＜0.10%, Mn1.40～1.80%, Ti0.007～0.017%, Al＜0.01%, B0.0005～0.003%, P≤0.009%, S≤0.005%; And among the 0.0002～0.002%Mg, 0.0002～0.002%Ca one or both, all the other are iron and unavoidable impurities element.
The billet rolling operation is following: and process furnace reheat → wide and heavy plate mill is rolling → and acceleration cooling system cooling → roller-way air cooling is to room temperature.
1150～1200 ℃ of steel billet reheat temperature and insulation were handled 2～3 hours.Rolling technology adopts the controlled rolling of two stages, wherein fs accumulative total draft>=50%; Subordinate phase rolling temperature≤860 ℃, draft>=60%.Roll that the back gets into accelerated cooling device and with speed water-cooled to 350～500 of 10～30 ℃/s ℃, air cooling can make the target steel plate to room temperature then.
Compared with prior art, advantage of the present invention is at least:
1) adopt hello cored wire technology to add the strong reductor of Mg/Ca first; And the speed that cored-wire adds waited and made clearly regulation with add-on, adding opportunity (liquid steel temperature, dissolved oxygen content before the line feeding), in molten steel and continuously cast bloom, obtained tiny oxide particles (area density>=3000 of the oxide particle of size≤2 μ m/mm of a large amount of densification distributions
2), significantly improved the welding property of final steel plate.
2) smelting process is got rid of use Al deoxidation; Reduced the content of solid solution attitude Al in the molten steel, eliminated it, strengthened the reflection of reductor and molten steel the strong reductor of adding and the interference of molten steel reaction; Significantly promote the quantity of target oxide particle, promoted final steel plate welding property.
3) rolling technology of low temperature heavy reduction (accumulative total draft >=80%) and fast process for cooling (10～30 ℃/s) when significantly improving armor plate strength; Its-80 ℃ of low-temperature impact toughness have also been guaranteed; Ys＞the 400MPa of final steel plate, Akv-80 ℃＞47J
Description of drawings
Fig. 1 is the mother metal micro-organization chart of steel embodiment 3 of the present invention;
Fig. 2 is the coarse-grain heat affected zone micro-organization chart of steel embodiment 3 of the present invention under welding heat input 500～600kJ/cm.
Specific embodiments
Below in conjunction with specific embodiment the present invention is described further:
Embodiment 1:
The molten steel smelting procedure is following:
Hot metal pretreatment → 180t combined blown converter smelting → LF refining → RH refining → hello silk → continuous casting.In the converter steelmaking process, it is 7.5 that the iron water amount and the ratio of cleaning steel scrap are used in shove charge, 1400 ℃ of molten iron temperatures, S≤0.003% by weight percentage, basicity of slag 3.5, MgO ratio 9.0%; About 30 ton hours of tapping add ferromanganese, ferrosilicon, lime successively.The LF refining process is made white slag, simultaneously molten steel is carried out deciding oxygen, adds ferro-boron, diffusive deoxidation and get molten steel appearance and carry out trimming.The RH vacuum-treat stage; Oxygen determination also adds ferrotianium with Control for Oxygen Content behind 10～100ppm; 1570～1600 ℃ of clean circulation back liquid steel temperatures, behind oxygen level 20～80ppm, broken empty and in molten steel, feed the Mg alloy cored wine of 400 meters length with the speed of 5 meter per seconds; The cored-wire diameter is 10mm, soft then stirring 8 minutes.Pouring temperature is controlled at 1570～1590 ℃, and the continuously cast bloom pulling rate is 1.1 meter per seconds, makes continuous casting material.
Continuous casting material chemical ingredients (weight percent) comprises C 0.03%, Si 0.08%, Mn 1.52%, Ti0.012%, Als 0.005%, B 0.0012%, Mg 0.0015%, P 0.007%, S 0.003%.
The billet rolling operation is following:
With the continuously cast bloom reheat to 1180 of mentioned component ℃ and be incubated 2 hours, it is 1100 ℃ that the back roughing of coming out of the stove begins temperature, and thickness is depressed 220 → 100mm, accumulative total draft 0.55; Roll plate after roughing finishes and on roller-way, treat temperature; Finish rolling begins 860 ℃ of temperature, and finishing temperature is at 820 ℃, and thickness is depressed 100 → 40mm, accumulative total draft 0.60; Roll plate after rolling and be cooled to 500 ℃ with the speed of 12 ℃/s air cooling is to room temperature then, the thickness specification of system is the target steel plate of 40mm.
Roll firm and hard rerum natura ability
Rolling the plate ys is 445MPa, tensile strength 542MPa, elongation after fracture 25.6%, Akv-80 ℃=298J.The oxide particle that rolls in the plate is main with titanium Magnesium coumpoud oxide particle, area density>=3100 of the oxide particle of size≤2 μ m/mm
2
Roll the welding property of plate and see table 1.
Embodiment 2:
The molten steel smelting procedure is following:
Hot metal pretreatment → 180t combined blown converter smelting → LF refining → RH refining → hello silk → continuous casting.In the converter steelmaking process, it is 7 that the iron water amount and the ratio of cleaning steel scrap are used in shove charge, 1450 ℃ of molten iron temperatures, S≤0.003% by weight percentage, basicity of slag 3.5, MgO ratio 9.0%; About 20 ton hours of tapping add ferromanganese, ferrosilicon, lime successively.The LF refining process is made white slag, adds ferro-boron, simultaneously molten steel is carried out deciding oxygen, diffusive deoxidation and gets molten steel appearance and carry out trimming, and its tapping temperature is controlled at 1620～1640 ℃.The RH vacuum-treat stage; Require the back to add ferrotianium when the molten steel oxygen level satisfies 10～100ppm, oxygen determination then, treat 1570～1600 ℃ of liquid steel temperatures, the satisfied 20～80ppm of oxygen level after; Clean circulation back is broken empty; In molten steel, feed the Mg alloy cored wine of 350 meters length then with the speed of 4 meter per seconds, the cored-wire diameter is 14mm, soft then stirring 6 minutes.Pouring temperature is controlled at 1570～1590 ℃, and the continuously cast bloom pulling rate is 1.3 meter per seconds, makes continuous casting material.
The chemical ingredients of continuous casting material is: C 0.03%, Si 0.09%, Mn 1.62%, Ti 0.012%, Als0.004%, B 0.0016%, Mg 0.0012%, P 0.007%, S 0.002%.
The billet rolling operation is following:
The continuously cast bloom of mentioned component is heated to 1200 ℃ and be incubated 2 hours, and it is 1080 ℃ that the back roughing of coming out of the stove begins temperature, and thickness is depressed 320 → 160mm, accumulative total draft 0.50; Roll plate after roughing finishes and on roller-way, treat temperature; Finish rolling begins 850 ℃ of temperature, and finishing temperature is at 810 ℃, and thickness is depressed 160 → 60mm, accumulative total draft 0.63; Roll plate after rolling and be cooled to 460 ℃ with the speed of 15 ℃/s air cooling is to room temperature then, the thickness specification of system is the target steel plate of 60mm.
Roll firm and hard rerum natura ability
Rolling the plate ys is 427MPa, tensile strength 511MPa, elongation after fracture 26.5%, Akv-80 ℃=288J.The oxide particle that rolls in the plate is main with titanium Magnesium coumpoud oxide particle, area density>=3220 of the oxide particle of size≤2 μ m/mm
2
Welding property is seen table 1.
Embodiment 3:
The molten steel smelting procedure is following:
Hot metal pretreatment → 180t combined blown converter smelting → LF refining → RH refining → hello silk → continuous casting.In the converter steelmaking process, it is 8 that the iron water amount and the ratio of cleaning steel scrap are used in shove charge, 1430 ℃ of molten iron temperatures, S≤0.003% by weight percentage, basicity of slag 3.5; About 35 ton hours of tapping add ferromanganese, ferrosilicon, lime successively.The LF refining process is made white slag, simultaneously molten steel is carried out deciding oxygen, adds ferro-boron, trimming, and tapping temperature is controlled at 1620～1640 ℃.The RH vacuum stages; When satisfying, the molten steel oxygen level adds ferrotianium after 10～100ppm requires; Oxygen determination then, after the oxygen level of treating molten steel satisfied 20～80ppm, broken empty back fed the calcium alloy cored-wire of 380 meters length in molten steel with the speed of 4.5 meter per seconds; The cored-wire diameter is 12mm, soft then stirring 9 minutes.Pouring temperature is controlled at 1570～1590 ℃, and the continuously cast bloom pulling rate is 1.2 meter per seconds, makes continuous casting material.
Continuous casting material chemical ingredients (weight percent) is: C 0.05%, Si 0.05%, Mn 1.65%, Ti0.011%, Als 0.0065%, B 0.0014%, Ca 0.0014%, P 0.006%, S 0.002%.
The billet rolling operation is following:
The continuously cast bloom of mentioned component is heated to 1200 ℃ and be incubated 2 hours, and it is 1120 ℃ that the back roughing of coming out of the stove begins temperature, and thickness is depressed 320 → 150mm, accumulative total draft 0.53; Roll plate after roughing finishes and on roller-way, treat temperature; Finish rolling begins 870 ℃ of temperature, and finishing temperature is at 800 ℃, and thickness is depressed 150 → 60mm, accumulative total draft 0.60; Roll plate after rolling and be cooled to 420 ℃ with the speed of 18 ℃/s air cooling is to room temperature then, the thickness specification of system is the target steel plate of 60mm.
Roll firm and hard rerum natura ability
Rolling the plate ys is 41 8MPa, tensile strength 508MPa, elongation after fracture 28.3%, Akv-80 ℃=268J.The oxide particle that rolls in the plate is main with titanium calcium composite oxide particle, area density>=3220 of the oxide particle of size≤2 μ m/mm
2
Welding property is seen table 1.
The present invention is through the controlled rolling and the technology for controlled cooling of in detail accurate smelting technology control, continuous casting material; Can on the existing big production platform of steel mill, produce the low temperature steel plate of can be big hot input welding; Steel plate ys＞400MPa;-80 ℃ of Charpy-V impact power＞47J, and big heat input (can guarantee that still-60 ℃ of toughness of HAZ meet the demands during 500～600kJ/cm) welding.According to working method of the present invention, can stablize, continuously produce the required input of the heat greatly welding Steel Plates For Low Temperature Service in cold district energy construction engineering fields such as (boats and ships, ocean platforms).
Table 1 embodiment steel plate welding property
Claims (4)
- One kind can be greatly the working method of low temperature steel plate of heat input welding, adopt hot metal pretreatment, converter smelting, the LF refining, silk and continuous casting process are fed in the RH refining, and be rolling by common Clean Steel technology, it is characterized in that,The converter shove charge greater than 7, adds ferromanganese, ferrosilicon and lime with the ratio of molten iron and steel scrap successively in the smelting procedure during tapping; White slag is made in the LF refining, adds ferro-boron, 1610～1640 ℃ of tapping temperatures; The RH station; Guarantee degassing time>=10 minute to treat molten steel dissolved oxygen content 10～100ppm, add ferrotianium; After treating that 1570～1600 ℃ of liquid steel temperatures and molten steel dissolved oxygen content 20～80ppm satisfy simultaneously; Broken sky also feeds magnesiumalloy and/or calcium alloy cored-wire in molten steel, soft then stirring is more than 5 minutes, after continuous casting obtains continuously cast bloom; The continuously cast bloom composition that obtains by weight percentage is: C≤0.07%, Si＜0.10%, Mn 1.40～1.80%, Ti 0.007～0.017%, Al＜0.01%, B 0.0005～0.003%, P≤0.009%, S≤0.005%; And among the 0.0002～0.002%Mg, 0.0002～0.002%Ca one or both, all the other are iron and unavoidable impurities element;In the rolling process; 1150～1200 ℃ of continuously cast bloom reheat temperature and insulation are handled after 2～3 hours and are carried out controlled rolling and controlled chilling; The rolling draft of the accumulative total of rolling sequence>=80% wherein, two-stage rolling temperature≤860 ℃, rolling draft of two-stage>=60%; Roll the back steel plate with speed water-cooled to 350～500 of 10～30 ℃/s ℃, air cooling is to room temperature then.
- 2. as claimed in claim 1 can be greatly the working method of low temperature steel plate of heat input welding, it is characterized in that converter tapping front opening steel ladle bottom argon blowing valve, converter tapping account for 10 of converter total volume～20% and o'clock add ferromanganese, ferrosilicon and lime successively.
- 3. the working method of the low temperature steel plate of the input of heat greatly welding as claimed in claim 1 is characterized in that the speed with 4～6 meter per seconds in hello the silk process feeds 200～400 meters magnesiumalloy or calcium alloy cored-wire in molten steel.
- 4. the working method of the low temperature steel plate of the input of heat greatly welding as claimed in claim 3 is characterized in that the diameter of described magnesiumalloy or calcium alloy cored-wire is 10～14mm.
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| CN103451561A (en) * | 2013-08-16 | 2013-12-18 | 江苏省沙钢钢铁研究院有限公司 | Weather-resistant steel plate capable of being welded at high heat input and production method thereof |
| CN103526112A (en) * | 2013-10-18 | 2014-01-22 | 武汉钢铁(集团)公司 | Anti-corrosion steel for bridge tubular pile and production method of anti-corrosion steel |
| CN103741025A (en) * | 2013-12-23 | 2014-04-23 | 东北大学 | Method for preparing boron-containing micro-alloy steel by using boron-containing pig iron as boron charging agent |
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| CN103741025A (en) * | 2013-12-23 | 2014-04-23 | 东北大学 | Method for preparing boron-containing micro-alloy steel by using boron-containing pig iron as boron charging agent |
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| CN110656219A (en) * | 2018-06-29 | 2020-01-07 | 上海梅山钢铁股份有限公司 | Method for controlling center segregation of fine blanking steel 40MnB continuous casting slab |
| CN109628693A (en) * | 2019-01-28 | 2019-04-16 | 苏州大学 | A kind of low cost magnesium processing micro alloyed steel and preparation method thereof |
| CN110117694A (en) * | 2019-04-09 | 2019-08-13 | 上海大学 | The magnesium adding technology method of the automatic steel containing magnesium |
| CN110117694B (en) * | 2019-04-09 | 2021-06-04 | 上海大学 | Magnesium adding process for magnesium-containing free-cutting steel |
| CN109988883A (en) * | 2019-04-09 | 2019-07-09 | 上海大学 | The magnesium calcium adding technology method of the non-hardened and tempered steel of calcium containing magnesium |
| CN111519098A (en) * | 2020-05-12 | 2020-08-11 | 首钢集团有限公司 | Low-carbon steel and deoxidation method for controlling inclusions in low-carbon steel |
| CN111519098B (en) * | 2020-05-12 | 2021-06-15 | 首钢集团有限公司 | Low-carbon steel and deoxidation method for controlling inclusions in low-carbon steel |
| CN112139242B (en) * | 2020-08-24 | 2022-07-08 | 龙岩学院 | Steel for large heat input welding and method for improving toughness of heat affected zone of steel |
| CN112139242A (en) * | 2020-08-24 | 2020-12-29 | 龙岩学院 | Steel for large heat input welding and method for improving toughness of heat affected zone of steel |
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| CN114672733B (en) * | 2022-03-30 | 2023-02-24 | 江苏省沙钢钢铁研究院有限公司 | 690 MPa-grade steel plate capable of being welded under high heat input and production method thereof |
| CN115537668A (en) * | 2022-11-01 | 2022-12-30 | 江苏省沙钢钢铁研究院有限公司 | Low-temperature steel bar and production method thereof |
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