CN110202106A - The method for controlling CSP thin sheet continuous casting machine production medium carbon alloy steel slab surface cracks - Google Patents

The method for controlling CSP thin sheet continuous casting machine production medium carbon alloy steel slab surface cracks Download PDF

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Publication number
CN110202106A
CN110202106A CN201910483529.6A CN201910483529A CN110202106A CN 110202106 A CN110202106 A CN 110202106A CN 201910483529 A CN201910483529 A CN 201910483529A CN 110202106 A CN110202106 A CN 110202106A
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China
Prior art keywords
mass percent
continuous casting
thin sheet
alloy steel
medium carbon
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Pending
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CN201910483529.6A
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Chinese (zh)
Inventor
冯永平
谯德高
张长顺
张荣堂
马金邦
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Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd
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Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd
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Priority to CN201910483529.6A priority Critical patent/CN110202106A/en
Publication of CN110202106A publication Critical patent/CN110202106A/en
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    • 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
    • B22D11/111—Treating the molten metal by using protecting powders
    • 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
    • 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
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • 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
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)

Abstract

A kind of method that the present invention proposes control CSP thin sheet continuous casting machine production medium carbon alloy steel slab surface cracks, the mass percent of carbon is 0.16%~0.19% in the molten steel that refining treatment finishes, mass percent≤0.009% of sulphur, the mass percent of dissolved aluminum is 0.015%~0.023%, the mass percent of manganese is 0.25%~0.35%, the mass percent of niobium is 0.015%~0.030%, the mass percent of titanium is 0.015%~0.030%, soft blow argon gas 5min after calcium line inclusion modification is fed, [Ca]/[Als] is 0.12 or more.Beneficial effect is to realize medium carbon alloy steel in the stability contorting of CSP thin sheet continuous casting billet surface crackle, and ratio of defects controls below 0.07%.

Description

The method for controlling CSP thin sheet continuous casting machine production medium carbon alloy steel slab surface cracks
Technical field
The invention belongs to Sheet-bar Continuous Casting Technique, in particular to control CSP thin sheet continuous casting machine produces medium carbon alloy steel slab The method of face crack.
Background technique
CSP thin sheet continuous casting because its crystallizer funnel shaped particularity, initial solidification shell in crystallizer motion process by Stress caused by very big mechanical stress and solidification shrinkage, slab are very easy to generate vertical and horizontal crackle, become current CSP continuous casting quality controls one of problem.
For producing the stronger medium carbon low alloy steel kind of crack sensitivity, surface is extremely easy to produce under high pulling rate and is split Line, and the addition of the alloying elements such as Mn, Ti, V, Nb, because Ti, V, Nb for being dissolved under high temperature exist during temperature reduces with Ti (CN), V(CN), Nb(CN) form austenite grain boundary be precipitated, the crack sensitivity further strengthened；In addition Mn, Ti, V etc. Ingredient is reacted in casting process with oxide in covering slag, is generated new oxide and is entered covering slag and seriously changes covering slag Performance especially changes the crystalline solid ratio of covering slag slag film, causes covering slag Heat Transfer Control and lubrication matching capacity reduction. Factors above causes meniscus position initial solidification shell to shrink the biggish temperature field stress of generation, transformation stress and mechanical stress, Defect is cracked when binding force between stress is more than crystal boundary；In the case where two cold water distributions are unreasonable, slab is in fan-shaped section It is interior to be led to crack propagation by non-uniform combined stress, it is final to generate serious surface longitudinal crack defect.Because sheet billet surface without Method carries out reconditioning processing, once crack defect without processing means are made up, it can only be by waste disposal；Surface crack defect is serious Product quality and its service performance are affected, production disruption is seriously then caused, brings huge economic loss.How surface is solved Lobe problem, guaranteeing production, qualified continuous casting billet is technological difficulties place.
Summary of the invention
In order to solve above-mentioned technical problem, the present invention provides a kind of control CSP thin sheet continuous casting machines to produce medium carbon alloy steel The method of slab surface cracks, effective solution CSP continuous casting funnel mould production medium carbon alloy steel surface longitudinal crack are difficult to The problem of control.
The technical scheme adopted by the invention is as follows: a kind of control CSP thin sheet continuous casting machine production medium carbon alloy steel steel slab surface The method of crackle, the mass percent of carbon is 0.16% ~ 0.19% in the molten steel that refining treatment finishes, the mass percent of sulphur≤ 0.009%, the mass percent of dissolved aluminum is 0.015% ~ 0.023%, and the mass percent of manganese is 0.25% ~ 0.35%, the quality of niobium Percentage is 0.015% ~ 0.030%, and the mass percent of titanium is 0.015% ~ 0.030%, has fed soft blow after calcium line inclusion modification Argon gas 5min, [Ca]/[Als] is 0.12 or more.
The width of steel billet is 1250mm ~ 1600mm, with a thickness of 52mm ~ 70mm；Funnel-form crystallizer vibration uses positive modeling Formula, bearing de- rate is 18% ~ 19%；Crystallizer copper plate surface naked eyes visible crack, the wide face of cooling water inflow are 5700L/min ~ 6300L/ Min, leptoprosopy are 170L/min ~ 220L/min, and control crystallizer heat-flux ratio is 76% ~ 96%.
Drawing speed is 3.8m/min ~ 4.7m/min, and degree of superheat control is 20 DEG C ~ 30 DEG C；Used in crystallizer casting Viscosity is 0.08 ~ 0.12Pa.s when protection basicity of slag is 1.17 ~ 1.24,1300 DEG C, and fusion temperature is 1070 DEG C ~ 1090 DEG C, low Pulling rate high-viscosity covering slag, high pulling rate low viscosity covering slag；Molten steel casting process covering slag viscosity, basicity, pulling rate multiply Product is 0.47 ~ 0.53.
SiO in used covering slag2Content is 27.74% ~ 28.36%, and CaO content is 31.33% ~ 33.08%, Al2O3Content It is 3.26% ~ 4.08% for 2.34% ~ 3.45%, MnO content, solvent is 8.36% ~ 8.96%, and full carbon is 9.29% ~ 9.59%.
Secondary cooling is to 14 circuit water reasonable distributions, and specific water is set as 1.94L/kg ~ 2.17L/kg, and control is laterally Specific water is distributed to control within 30 DEG C of casting billet surface transverse temperature difference, and steel billet bending, straightening temperature are located at 920 DEG C ~ 1020 DEG C.
The invention has the benefit that refining provides the molten steel of Narrow Composition Control and suitable calcium aluminium ratio, continuous casting working procedure Using funnel mould, the sinusoidal vibration mode of small minus sliding ratio, control crystallization rate and the matched covering slag of greasy property, it is based on The Spraying Water of Nozzles in Secondary Cooling of specific water's adjustment, effective solution CSP thin sheet continuous casting casting medium carbon low alloy steel kind casting billet surface are vertical Problem is split, rejection rate is reduced, ratio of defects control, hereinafter, realizing the steady production under high pulling rate, has significant 0.07% Economic benefit.
Specific embodiment
Below with reference to embodiment, the present invention will be further described in detail.
Embodiment 1
The example is that medium carbon steel steel alloy surface longitudinal crack of slab defect is controlled using method above-mentioned, refining treatment qualification Molten steel main chemical compositions are shown in Table 1, and calcium aluminium ratio is 0.15, and billet specification is 1500mm × 70mm；Using sinusoidal vibration mode, bear De- rate is 18.32%；Drawing speed control is 3.8m/min, and molten steel overheat is 23 DEG C, in molten steel casting process crystallizer water Wide face is set as 5800L/min, and narrow side is set as 190L/min, and hot-fluid is 83% than control；Use protection basicity of slag (CaO/ SiO2) be 1.19, fusing point be 1085 DEG C, viscosity 0.097Pa.s, SiO2Content is 27.92%, CaO content 32.07%, AL2O3Content is that 3.41%, MnO content is 3.52%, and solvent 8.54%, full carbon is 9.31%；Secondary cooling uses preceding strong rear weak Mode, overall specific water's control are 976 DEG C in fan-shaped section exit in 1.98L/kg, casting blank surface temperature, transverse temperature difference 26 ℃。
1 embodiment of table, 1 medium carbon low alloy steel main chemical compositions (Wt%)
The slab produced using 1 method of embodiment excellent zero defect of product surface quality after heat pricks rolling.
Embodiment 2
The example is that medium carbon steel steel alloy surface longitudinal crack of slab defect is controlled using method above-mentioned, refining treatment qualification Molten steel main chemical compositions are shown in Table 2, and calcium aluminium ratio is 0.13, and billet specification is 1250mm × 52mm；Using sinusoidal vibration mode, bear De- rate is 18.64%；Drawing speed control is 4.7.m/min, and hot-fluid is 83% than control, and molten steel overheat is 26 DEG C, in molten steel The wide face of casting process crystallizer water is set as 6200L/min, and narrow side is set as 200L/min；Use protection basicity of slag (CaO/SiO2) be 1.20, fusing point be 1082 DEG C, viscosity 0.11Pa.s, SiO in the covering slag2Content is 28.31%, CaO Content is 32.36%, AL2O3Content is that 2.44%, MnO content is 3.68%, and solvent 8.39%, full carbon is 9.48；Secondary cooling makes With preceding strong rear weak mode, overall specific water's control is 985 DEG C in fan-shaped section exit in 1.93L/kg, casting blank surface temperature, Transverse temperature difference is 23 DEG C.
2 embodiment of table, 2 medium carbon low alloy steel main chemical compositions (Wt%)
The slab produced using 2 method of embodiment excellent zero defect of product surface quality after heat pricks rolling.

Claims (5)

1. a kind of method of control CSP thin sheet continuous casting machine production medium carbon alloy steel slab surface cracks, it is characterised in that: at refining The mass percent for managing carbon in the molten steel finished is 0.16% ~ 0.19%, mass percent≤0.009% of sulphur, the quality of dissolved aluminum Percentage is 0.015% ~ 0.023%, and the mass percent of manganese is 0.25% ~ 0.35%, the mass percent of niobium is 0.015% ~ 0.030%, the mass percent of titanium is 0.015% ~ 0.030%, has fed soft blow argon gas 5min after calcium line inclusion modification, [Ca]/ [Als] is 0.12 or more.
2. the method for control CSP thin sheet continuous casting machine production medium carbon alloy steel slab surface cracks according to claim 1, Be characterized in that: the width of steel billet is 1250mm ~ 1600mm, with a thickness of 52mm ~ 70mm；Funnel-form crystallizer vibration uses positive modeling Formula, bearing de- rate is 18% ~ 19%；Crystallizer copper plate surface naked eyes visible crack, the wide face of cooling water inflow are 5700L/min ~ 6300L/ Min, leptoprosopy are 170L/min ~ 220L/min, and control crystallizer heat-flux ratio is 76% ~ 96%.
3. the method for control CSP thin sheet continuous casting machine production medium carbon alloy steel slab surface cracks according to claim 1, Be characterized in that: drawing speed is 3.8m/min ~ 4.7m/min, and degree of superheat control is 20 DEG C ~ 30 DEG C；Used in crystallizer casting Viscosity is 0.08 ~ 0.12Pa.s when protection basicity of slag is 1.17 ~ 1.24,1300 DEG C, and fusion temperature is 1070 DEG C ~ 1090 DEG C, low Pulling rate high-viscosity covering slag, high pulling rate low viscosity covering slag；Molten steel casting process covering slag viscosity, basicity, pulling rate multiply Product is 0.47 ~ 0.53.
4. the method for control CSP thin sheet continuous casting machine production medium carbon alloy steel slab surface cracks according to claim 1, It is characterized in that: SiO in used covering slag2Content is 27.74% ~ 28.36%, and CaO content is 31.33% ~ 33.08%, Al2O3Contain It is 3.26% ~ 4.08% that amount, which is 2.34% ~ 3.45%, MnO content, and solvent is 8.36% ~ 8.96%, and full carbon is 9.29% ~ 9.59%.
5. the method for control CSP thin sheet continuous casting machine production medium carbon alloy steel slab surface cracks according to claim 1, Be characterized in that: for secondary cooling to 14 circuit water reasonable distributions, specific water is set as 1.94L/kg ~ 2.17L/kg, and control is horizontal It is distributed to specific water to control within 30 DEG C of casting billet surface transverse temperature difference, steel billet bending, straightening temperature are located at 920 DEG C ~ 1020 DEG C.
CN201910483529.6A 2019-06-04 2019-06-04 The method for controlling CSP thin sheet continuous casting machine production medium carbon alloy steel slab surface cracks Pending CN110202106A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112989687A (en) * 2019-12-18 2021-06-18 上海梅山钢铁股份有限公司 Forecasting method for continuous casting billet corner transverse crack defect based on metallurgical principle
CN114054711A (en) * 2021-11-23 2022-02-18 马鞍山钢铁股份有限公司 Control method for surface inclusions of low-carbon enamel steel casting blank

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101147963A (en) * 2007-09-30 2008-03-26 马鞍山钢铁股份有限公司 Method for reducing CSP casting billet surface longitudinal microcrack and folding defect
CN101348843A (en) * 2008-08-08 2009-01-21 湖南华菱涟源钢铁有限公司 Method for producing hot rolled steel strip for automotive frame
CN101418363A (en) * 2008-11-13 2009-04-29 湖南华菱涟源钢铁有限公司 Method for producing low carbon and high ductility X60/X65pipeline steel
CN103160752A (en) * 2011-12-14 2013-06-19 鞍钢股份有限公司 High strength seamless steel pipe with excellent low temperature toughness and manufacturing method thereof
CN107186186A (en) * 2017-04-27 2017-09-22 甘肃酒钢集团宏兴钢铁股份有限公司 A kind of method that CSP conticasters pour into a mould weather resisting steel
EP3341142A1 (en) * 2015-08-28 2018-07-04 SMS Group GmbH Installation based on the csp concept and method for operating such an installation
CN109794589A (en) * 2019-01-09 2019-05-24 邯郸钢铁集团有限责任公司 A kind of process control method preventing CSP continuous casting billet lobe defect

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101147963A (en) * 2007-09-30 2008-03-26 马鞍山钢铁股份有限公司 Method for reducing CSP casting billet surface longitudinal microcrack and folding defect
CN101348843A (en) * 2008-08-08 2009-01-21 湖南华菱涟源钢铁有限公司 Method for producing hot rolled steel strip for automotive frame
CN101418363A (en) * 2008-11-13 2009-04-29 湖南华菱涟源钢铁有限公司 Method for producing low carbon and high ductility X60/X65pipeline steel
CN103160752A (en) * 2011-12-14 2013-06-19 鞍钢股份有限公司 High strength seamless steel pipe with excellent low temperature toughness and manufacturing method thereof
EP3341142A1 (en) * 2015-08-28 2018-07-04 SMS Group GmbH Installation based on the csp concept and method for operating such an installation
CN107186186A (en) * 2017-04-27 2017-09-22 甘肃酒钢集团宏兴钢铁股份有限公司 A kind of method that CSP conticasters pour into a mould weather resisting steel
CN109794589A (en) * 2019-01-09 2019-05-24 邯郸钢铁集团有限责任公司 A kind of process control method preventing CSP continuous casting billet lobe defect

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112989687A (en) * 2019-12-18 2021-06-18 上海梅山钢铁股份有限公司 Forecasting method for continuous casting billet corner transverse crack defect based on metallurgical principle
CN112989687B (en) * 2019-12-18 2023-11-07 上海梅山钢铁股份有限公司 Method for forecasting transverse crack defect of continuous casting billet angle based on metallurgical principle
CN114054711A (en) * 2021-11-23 2022-02-18 马鞍山钢铁股份有限公司 Control method for surface inclusions of low-carbon enamel steel casting blank

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