CN105695659B - The 37Mn circular pipe blank slab quality control method of φ 280mm - Google Patents
The 37Mn circular pipe blank slab quality control method of φ 280mm Download PDFInfo
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- CN105695659B CN105695659B CN201610169866.4A CN201610169866A CN105695659B CN 105695659 B CN105695659 B CN 105695659B CN 201610169866 A CN201610169866 A CN 201610169866A CN 105695659 B CN105695659 B CN 105695659B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Continuous Casting (AREA)
Abstract
Disclosed by the invention is that a kind of of field of metallurgy produces the 37Mn round tube steel slab quality control method that cross dimensions is φ 280mm.This method includes converter smelting, LF furnace refined molten steel, RH application of vacuum and continuous casting steel and etc., first, in the smelting molten steel stage according to reasonable state modulator, improve the degree of purity of molten steel, and by carrying out Trace Titanium Treatment to molten steel, improve its high-temp plastic, reduce steel grade crack sensitivity, then during pouring molten steel, using M-EMS in such a way that solidification end electromagnetic agitation combines, so that molten steel component and equalizing temperature, green shell homoepitaxial, casting blank solidification tissue is effectively improved, loose grading improves, equiax crystal region area expands, round billet central area compactness effectively improves, slab crack defect is effectively controlled, surface is improved improvement without cleaning rate, mill bar quality control is good and stablizes.
Description
Technical field
The present invention relates to field of steel metallurgy more particularly to a kind of 37Mn round tube slab for producing φ 280mm to cast quality control
Method processed.
Background technique
37Mn circular pipe blank steel is mainly for the production of high pressure gas cylinder use, and chemical constituent is by weight percentage are as follows: C:0.35%
~0.39%, Si:0.17%~0.28%, Mn:1.55%~1.70%, P≤0.020%, S≤0.010%, Cr≤
0.20%, Cu≤0.15%, Mo≤0.08%, Ni≤0.20%, Alt:0.020%~0.040%, surplus Fe.It is produced
Product be that a kind of repeatable mobile steel cylinder filled is widely used in for containing permanent gases or high pressure liquefied gas
The industrial sectors of national economy such as industrial and mining enterprises and building, traffic, ocean, aviation, medical treatment and military affairs.The medium kind filled by gas cylinder
There are many class, and have inflammable, explosive, hypertoxic or etching characteristic, and gas cylinder repeated charging and mobility are big in addition, once it explodes
Or leakage, often concurrent fire or poisoning, cause catastrophic failure, cause casualties and property loss.With society
Expanding economy, diversity, high efficiency, the persistence of gas cylinder filling gas constantly propose more harsh want to gas cylinder quality
It asks, and the air bottle steel slab as gas cylinder production raw material, surface quality, internal soundness etc. never affect in Tongfang face
The processing of gas cylinder and the quality scale of gas cylinder product itself, specifically Inner Quality of Billet to the pipe operation of rolling and is rolled into
Quality produces bigger effect.
For 37Mn tube blank steel, the middle carbon, 1.55%~1.70% manganese content itself in steel grades are determined
Continuous casting production process slab crack sensitivity is stronger.It is relatively poor mainly due to steel grade elevated temperature strength height itself, toughness plasticity, and
Thermal coefficient is low, and linear expansion coefficient is big, and larger internal stress is generated during cooled and solidified, is easy to produce during continuous casting straightening
Surface crack defect.Furthermore since casting blank section is relatively large and is round billet, the smaller slab heat transfer efficiency of specific surface area is more
It is low, solidify cooling slowly, after green shell is formed, heat transfer efficiency decline will lead to slab cross section radial symmetry gradient and become larger, and pass
Hot directionality highlights, and further results in column crystal prosperity, the lower trend of equiaxial crystal ratio.Therefore, continuous casting process will take into account crackle
Control and casting blank solidification organization optimization realize that difficulty is larger.Optimize casting blank solidification tissue in continuous casting production process, reduction solidification passes
Hot directionality, and further controlling the generation of slab crackle is the key that comprehensively control 37Mn circular pipe blank slab quality.
Summary of the invention
For overcome the 37Mn round tube steel Inner Quality of Billet of existing larger cross dimensions it is universal it is lower, easily it is cracked etc. no
Foot, the technical problems to be solved by the present invention are: providing a kind of 37Mn round tube steel slab for being φ 280mm for cross dimensions
Enhance the control method of its internal soundness.
The technical solution adopted by the present invention to solve the technical problems is:
Produce the 37Mn circular pipe blank slab quality control method of φ 280mm, comprising the following steps:
I, converter smelting: converter terminal carbon is controlled according to mass percent 0.05%~0.15%, and outlet temperature >=
1670 DEG C of controls, red packet tapping, ladle thickness of slag layer≤80mm, chain-wales are fed by the feed quantity of 1.45~2.0m of steel per ton plus aluminium
Line, carries out deoxidation treatment, chain-wales target component by mass percentage: [C] 0.30%~0.35%, [Si] 0.18%~
0.25%, [Mn] 1.20%~1.40%, [P]≤0.015% are controlled, and carry out at least soft blow of 6min after deoxidation alloying
Argon processing；
II, LF furnace refined molten steel: carrying out the refining of LF furnace for molten steel obtained in step I, refines whole Argon stirring, refining
Latter stage be added titanium alloy material, additional amount by molten steel weight 0.020%~0.035% carry out with addition of, later carry out 200~500m
Feed quantity feed plus silicon-calcium wire carry out Calcium treatment, wherein in packet the first heat by the upper limit feed plus, after refining continue Argon stir
At least 6min is mixed, out-station temperature is by 1585~1615 DEG C of controls；
III, RH application of vacuum: molten steel carries out soft blow argon Homogenization Treatments, argon flow control after arriving at a station are as follows:
1200~1400NL/min, vacuum degree≤3mbar when processing, handle time >=13min, at trimming alloying
Homogenization time >=5min after reason, the control of vacuum outbound target Alt mass percent is 0.035%~0.045%, out-station temperature
It is controlled by 1550~1575 DEG C.
IV, continuous casting steel: continuous casting link using M-EMS in such a way that solidification end electromagnetic agitation combines,
Wherein, the parameter of M-EMS are as follows: stir current 100~200A, 2~4Hz；Solidification end stirring parameter are as follows:
50~100A of stir current, 4.0~7.0Hz of frequency.
Further, carrying out also needing to control following parameter when molten steel casting in step IV: degree of superheat control
At 25~40 DEG C, casting speed control is in 0.80~1.00m/min, and for the cooling control of crystallizer in 2400~2500L/min, two cold compare water
Amount control is in 0.23~0.32/kgSteel。
The beneficial effects of the present invention are: improving molten steel according to reasonable state modulator in the smelting molten steel stage first
Degree of purity, and by carrying out Trace Titanium Treatment to molten steel, its high-temp plastic is improved, steel grade crack sensitivity is reduced, in steel
During water is poured, using M-EMS in such a way that solidification end electromagnetic agitation combines, so that molten steel component
And equalizing temperature, green shell homoepitaxial, casting blank solidification tissue are effectively improved, loose grading raising, equiax crystal area surface
Product expands, round billet central area compactness effectively improves, and slab crack defect is effectively controlled, and surface is obtained without cleaning rate
Improve to improving, mill bar quality control is good and stablizes.
Specific embodiment
Below by way of specific embodiment, the invention will be further described, but should not be understood as restriction of the invention.
Those of ordinary skill in the art can also make various modifications, substitutions, changes in various forms according to above scheme.It is all based on upper
It states modification, substitution and alteration made by technical idea and belongs to the scope of the present invention.
Produce the 37Mn circular pipe blank slab quality control method of φ 280mm, comprising the following steps:
I, converter smelting: converter terminal carbon is controlled according to 0.05%~0.15%, outlet temperature >=1670 DEG C control,
Red packet tapping, ladle thickness of slag layer≤80mm, chain-wales are fed by the feed quantity of 1.45~2.0m of steel per ton plus aluminum steel, carry out deoxidation
Processing, chain-wales target component mass percent are pressed: [C] 0.30%~0.35%, [Si] 0.18%~0.25%, [Mn]
1.20%~1.40%, [P]≤0.015% is controlled, and the soft blow argon processing of at least 6min is carried out after deoxidation alloying；
II, LF furnace refined molten steel: carrying out the refining of LF furnace for molten steel obtained in step I, refines whole Argon stirring, refining
Latter stage be added titanium alloy material, additional amount by molten steel weight 0.020%~0.035% carry out with addition of, later carry out 200~500m
Feed quantity feed plus silicon-calcium wire carry out Calcium treatment, wherein in packet the first heat by the upper limit feed plus, after refining continue Argon stir
At least 6min is mixed, out-station temperature is by 1585~1615 DEG C of controls；
III, RH application of vacuum: molten steel carries out soft blow argon Homogenization Treatments, argon flow control after arriving at a station are as follows:
1200~1400NL/min, vacuum degree≤3mbar when processing, handle time >=13min, at trimming alloying
Homogenization time >=5min after reason, vacuum outbound target Alt control 0.035%~0.045%, out-station temperature by 1550~
1575 DEG C are controlled.
IV, continuous casting steel: continuous casting link using M-EMS in such a way that solidification end electromagnetic agitation combines,
Wherein, the parameter of M-EMS are as follows: stir current 100~200A, 2~4Hz；Solidification end stirring parameter are as follows:
50~100A of stir current, 4.0~7.0Hz of frequency.
Step I, II and III mainly control the smelting of molten steel, guarantee that molten steel has stable spy before casting
Property, uniform ingredient and pouring temperature appropriate.Wherein, converter steelmaking process mainly carry out deoxidation treatment, and be added and
Alloying elements are controlled, to guarantee the internal soundness of molten steel, improve its stability, the refining of LF furnace is to keep molten steel sufficiently anti-
It answers, and removes extra impurity, RH application of vacuum can further improve the degree of purity of molten steel, and keep the ingredient of molten steel more steady
It is fixed uniform, convenient for forming good solidified structure when subsequent casting.
Key of the invention is the continuous casting steel stage in step IV, it is generally the case that slab is solidifying in continuous casting process
Gu the crystallizer tissue in chill fine grained region, columnar zone, Center Equiaxial Crystal area is successively presented from casting billet surface to center for tissue
Region.To improve slab quality, Inner Quality of Billet is improved, metallurgy industry is generally adopted by electromagnetic agitating technology and coagulates at present
Gu end Reduction Technology, two kinds of technology effects achieved are all not ideal enough.Of the invention thes improvement is that, using knot
The mode that brilliant device electromagnetic agitation is combined with solidification end electromagnetic agitation.The mechanism of action of the technology is: M-EMS
By magnetic field generate electromagnetic torque, change crystallizer inside flow field of molten steel, thermo parameters method situation, promote Mold at
Divide, equalizing temperature, weaken the directionality of solidification and heat transfer, promotes green shell homoepitaxial；Further, solidification end electromagnetic agitation
By forcing the flowing of driving mushy zone molten steel, fusing is washed away to columanar structure, improves equiax crystal nucleation rate, inhibits column crystal
Growth expands isometric crystalline region, improves Inner Quality of Billet.
Further, it when carrying out the continuous casting steel stage, if the control of solidification end electromagnetic agitation intensity is bad, is easy to make
It is washed away seriously at dentrite tip, the low solute concentration molten steel of the strong mobility of low melting point is caused to be assembled in a ring, form white band, because
This needs accurately to control its stirring intensity, furthermore in order to guarantee last quality of becoming a useful person, need to also carry out molten steel casting
When control following parameter: degree of superheat control is at 25~40 DEG C, and casting speed control is in 0.80~1.00m/min, the cooling control of crystallizer
In 2400~2500L/min, Water Rate for Secondary Cooling Water is controlled in 0.23~0.32/kgSteel.The reasonable degree of superheat, pulling rate match control and
Intensity of secondary cooling formulation is the key that conduct heat to control to casting blank solidification, i.e. the key of slab center mass control.
Embodiment:
Certain steel mill is disconnected using 120t converter smelting → LF furnace refining → RH application of vacuum → six machines six stream casting machine φ 280mm
Face continuous casting 37Mn circular pipe blank.At the end of bessemerizing, aim carbon is controlled for 0.10%, and outlet temperature is controlled 1673
℃；After the completion of tapping, thickness of slag layer 72mm；Chain-wales press 1.7m/tSteelIt feeds aluminum steel and carries out deoxidation；Chain-wales are outbound at sub-prime
Measure percentage control are as follows: [C] 0.32%, [Si] 0.21%, [Mn] 1.20%, [P] 0.011%；It is carried out after deoxidation alloying soft
Argon stirring, mixing time 6.5min, it is exposed that stirring does not occur molten steel.
Molten steel reaches at LF refining furnace, carries out Argon molten steel and fluctuates slightly, does not occur turning over phenomenon greatly, after refining, press
The 0.020% of molten steel weight is with addition of Ti；It is fed with addition of after plus 400m silicon-calcium wire carries out Calcium treatment, carried out 7.2min after line feeding
Soft blow stirring, LF out-station temperature be 1600 DEG C.
RH arrive at a station after carry out Argon Homogenization Treatments, argon flow 1320NL/min, vacuum degree under the conditions of 2.7mbar at
14min, Homogenization Treatments time 5.5min after alloying component fine tuning, the outbound target Alt:0.040% of vacuum are managed, out-station temperature is
1561℃。
Allocation and transportation to six machines six stream casting machine φ 280mm section carries out molten steel casting after RH application of vacuum, wants with the present invention
Ask the practical control of relevant critical technical parameter are as follows: M-EMS: stir current 145A, stirring frequency 3.0Hz；Solidification
End electromagnetic agitation: stir current 75A, stirring frequency 7.0Hz；The practical continuous casting process degree of superheat control of molten steel is at 25~32 DEG C；
Pulling rate is 1.0m/min；The cooling control of crystallizer is in 2460L/min；Water Rate for Secondary Cooling Water is controlled in 0.285/kgSteel。
After utilization is stablized in above-mentioned technological invention, slab quality is well controlled, slab low power testing result are as follows: slab is dredged
0.5~1.0 grade of looseness, non-densified regions diameter proportion 40.1%；The defects of casting billet surface flawless, casting billet surface are comprehensive without cleaning
Rate reaches 98.7%.Slab in-situ metal analyzes consistency detection, central area 0.83, slab equiax crystal section length ratio
50.1%~53.4%；It is 0.96~1.03 that slab, which bores sample segregation testing result,.
Claims (1)
1. the 37Mn circular pipe blank slab quality control method of φ 280mm, which comprises the following steps:
I, converter smelting: converter terminal carbon is controlled according to mass percent 0.05%~0.15%, outlet temperature >=1670
DEG C control, red packet tapping, ladle thickness of slag layer≤80mm, chain-wales by 1.45~2.0m of steel per ton feed quantity feed plus aluminum steel,
Carry out deoxidation treatment, chain-wales target component by mass percentage: [C] 0.30%~0.35%, [Si] 0.18%~0.25%,
[Mn] 1.20%~1.40%, [P]≤0.015% are controlled, and the soft blow argon processing of at least 6min is carried out after deoxidation alloying；
II, LF furnace refined molten steel: carrying out the refining of LF furnace for molten steel obtained in step I, refines whole Argon stirring, refines latter stage
Be added titanium alloy material, additional amount by molten steel weight 0.020%~0.035% carry out with addition of, later carry out 200~500m feed
Enter amount feed plus silicon-calcium wire carry out Calcium treatment, wherein in packet the first heat by the upper limit feed plus, after refining continue Argon stir to
Few 6min, out-station temperature is by 1585~1615 DEG C of controls；
III, RH application of vacuum: molten steel carries out soft blow argon Homogenization Treatments, argon flow control after arriving at a station are as follows:
1200~1400NL/min, vacuum degree≤3mbar when processing, handle time >=13min, after trimming Alloying Treatment
Homogenization time >=5min, the outbound target Alt mass percent control of vacuum 0.035%~0.045%, press by out-station temperature
1550~1575 DEG C are controlled；
IV, continuous casting steel: continuous casting link using M-EMS in such a way that solidification end electromagnetic agitation combines,
In, the parameter of M-EMS are as follows: stir current 100~200A, 2~4Hz；Solidification end stirring parameter are as follows: stir
Mix 50~100A of electric current, 4.0~7.0Hz of frequency；
Carry out also needing to control following parameter when molten steel casting in step IV: degree of superheat control is at 25~40 DEG C, pulling rate
Control in 0.80~1.00m/min, the cooling control of crystallizer in 2400~2500L/min, Water Rate for Secondary Cooling Water control 0.23~
0.32/kgSteel。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610169866.4A CN105695659B (en) | 2016-03-23 | 2016-03-23 | The 37Mn circular pipe blank slab quality control method of φ 280mm |
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| CN201610169866.4A CN105695659B (en) | 2016-03-23 | 2016-03-23 | The 37Mn circular pipe blank slab quality control method of φ 280mm |
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| CN105695659A CN105695659A (en) | 2016-06-22 |
| CN105695659B true CN105695659B (en) | 2019-01-15 |
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| CN106180611A (en) * | 2016-07-08 | 2016-12-07 | 江苏联峰能源装备有限公司 | It is applicable to process the continuous cast round billets production technology of ring-like forging |
| CN107350442B (en) * | 2017-06-28 | 2019-04-19 | 江苏省沙钢钢铁研究院有限公司 | Method for improving internal quality of plate blank by adopting electromagnetic stirring |
| CN108772542A (en) * | 2018-06-29 | 2018-11-09 | 攀钢集团攀枝花钢铁研究院有限公司 | The method that bloom continuous casting produces 20CrMo pinion steels |
| CN115466825B (en) * | 2022-08-29 | 2024-01-30 | 包头钢铁（集团）有限责任公司 | Method for improving middle and subcutaneous cracks of high-strength weather-proof anti-seismic peritectic steel special-shaped blank flange plate |
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| CN105177416B (en) * | 2015-09-11 | 2017-03-29 | 山东钢铁股份有限公司 | A kind of furnace shell heat-resisting steel plate of pressure vessel and its manufacture method |
| CN105331885A (en) * | 2015-10-09 | 2016-02-17 | 天津钢铁集团有限公司 | Production method of 37 Mn round billets for air cylinders |
| CN105177427A (en) * | 2015-10-21 | 2015-12-23 | 攀钢集团西昌钢钒有限公司 | Steel for 30CrMo gas cylinders and production method thereof |
| CN105215310A (en) * | 2015-11-17 | 2016-01-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method that big cross section Properties of Heavy Rail Steel strand center porosity controls |
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