CN103302262B - Continuous casting plate blank surface quenching technology and used device - Google Patents

Continuous casting plate blank surface quenching technology and used device Download PDF

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Publication number
CN103302262B
CN103302262B CN201310255325.XA CN201310255325A CN103302262B CN 103302262 B CN103302262 B CN 103302262B CN 201310255325 A CN201310255325 A CN 201310255325A CN 103302262 B CN103302262 B CN 103302262B
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China
Prior art keywords
nozzle
continuous casting
water
pipe
slab
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CN201310255325.XA
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Chinese (zh)
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CN103302262A (en
Inventor
张润生
刁承民
刘建伟
张海民
蔡起良
王玉民
温维新
苗振鲁
叶勇
吴克刚
马海涛
王嘉祺
薛燕
孔雅
于海燕
聂红梅
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济钢集团有限公司
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Publication of CN103302262A publication Critical patent/CN103302262A/en
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Abstract

The invention provides a continuous casting plate blank surface quenching technology and a used device. Before a continuous casting plate blank enters a heating furnace, the continuous casting plate blank is subjected to quick surface cooling on a continuous casting cutting conveying roll way; a temperature is reduced below 600 DEG C quickly; and an upper nozzle set and a lower nozzle set are arranged between adjacent conveying rolls of the continuous casting cutting conveying roll way. Nitride or carbonitride of bulky microalloy elements such as Nb, V, Ti, Al and B is inhibited from being precipitated on an austenite grain boundary effectively, so that crizzle of a steel plate after hot charge rolling of microalloy steel is avoided.

Description

A kind of slab surface quenching technical and equipment therefor
Technical field
The present invention relates to a kind of steel plate and make processing technology and device, in particular to a kind of slab surface quenching technical and equipment therefor, continuous casting steel billet goes out fan-shaped section rear surface temperature and is reduced to less than 600 DEG C fast, can avoid the generation of micro cracks on surface of steel plate after strand hot delivery and hot charging.
Background technology
The technological process of Plate Production routine is: blast-melted-molten iron pretreatment-converter-CAS-LF(-RH)-conticaster-heating furnace-roughing-finish rolling.Along with steel market competition is more and more fierce, industry is constantly seeking the measure reducing production cost further, continuous casting steel billet hot-loading and hot-conveying technique can reduce energy resource consumption, significantly improve the output of heating furnace, can improve the heating quality of heating furnace, reduce the scaling loss of continuous casting billet, and improve lumber recovery.
Plate surface quality depends on quantity and the form of stocking grain boundary precipitate in the operation of rolling, and these precipitates can hinder crystal boundary move and produce mechanical stress in stocking thermal deformation process, and after stress exceedes crystal boundary limit stress, limit produces micro-crack.
Rolling temperature of steel plate is when 650-1000 DEG C, and the nitride of the microalloy elements such as Nb, V, Ti, Al, B or Carbonitride Precipitation can the serious ductility reducing metal.Wherein, that have the greatest impact is AlN, AlN, and its Precipitation Temperature is between 750-900 DEG C, and speed of separating out is slow.
At present, by the impact of micro cracks on surface of steel plate, the domestic continuous casting steel billet hot delivery and hot charging ratio for rolling cut deal is still less than 20%, main cause be red send steel slab surface to separate out the microalloy elements such as thick Nb, V, Ti, Al, B nitride or carbonitride, before and after heating furnace heating, be gathered in grain boundaries in liquid form all the time, result in the embrittlement of crystal boundary, in the operation of rolling, occur along grain boundary separation and the phenomenon of expansion, cause surface of steel plate to occur micro-crack.
Summary of the invention
The present invention provides a kind of slab surface quenching technical and equipment therefor for above-mentioned defect exactly.A kind of slab surface quenching technical of the present invention and equipment therefor, object guarantees that continuous casting steel billet is reduced to less than 600 DEG C fast through quenching unit quenching rear surface temperature online, and then suppress the nitride of the microalloy element such as steel slab surface Nb, V, Ti, Al, B or carbonitride to be separated out at grain boundaries, and then avoid the generation of continuous casting steel billet Hot transfer and hot charging rolling micro cracks on surface of steel plate.Meanwhile, go out the high temperature after fan-shaped section (800 ~ 850 DEG C) strand, after moment rapid quenching, only a small amount of heat in surface is pulled away, ensure that continuous casting steel billet enter heating furnace before mean temperature be greater than 750 DEG C.
A kind of slab surface quenching technical technical scheme of the present invention is, before continuous casting steel billet enters heating furnace, continuous casting cutting rollgang carries out surperficial fast cooling, and temperature is reduced to less than 600 DEG C fast.
A kind of slab surface quenching unit of the present invention, each nozzle sets comprises and is parallel to conveying roller direction 1-3 and arranges, perpendicular to the nozzle that conveying roller direction 4-10 arranges.
Preferably, each nozzle sets comprises two rows five and arranges totally 10 nozzles, the nozzle location one_to_one corresponding of upper and lower nozzle sets.
Often arranging nozzle pitch is 450-600mm.
The nozzle of upper and lower nozzle sets is respectively apart from the upper and lower surface 250-330mm of slab.
Nozzle and steel slab surface angle are 45 °-65 °.
Often organize nozzle sets to be made up of nozzle pipe arrangement, support, nozzle, nozzle is connected to water-supply-pipe by nozzle pipe arrangement, and nozzle pipe arrangement is supported and fixed between the conveying roller of continuous casting cutting rollgang by support.
Nozzle pipe arrangement above the conveying roller roll surface of continuous casting cutting rollgang connects upper water-supply-pipe; Nozzle pipe arrangement below roll surface is connected to lower water-supply-pipe.
The total water current amount of upper water-supply-pipe is 700-720m 3/ h, each nozzle mean allocation water yield, hydraulic pressure is 10-12bar, and the total water current amount of lower water-supply-pipe is 880-900m 3/ h, each nozzle mean allocation water yield, hydraulic pressure is 10-12bar.
The invention has the advantages that: 1) fast high temperature casting blank surface temperature can be reduced to less than 600 DEG C, the nitride of microalloy element or the speed of separating out of carbonitride such as effective suppression Nb, V, Ti, Al, B, and a small amount of precipitate is wrapped in again in ferrite and pearlite after rising again in surface, heat can be avoided to send the generation of micro cracks on surface of steel plate after slab rolling.2) slab is after Quenching Treatment, and surface forms one deck and is about the thick tempered martensite of 20mm, then after the tempering of slab self heat, extexine forms the form compact and stable structure of one deck, is more conducive to the mechanical property improving steel plate.3) simultaneously, go out the high temperature after fan-shaped section (800 ~ 850 DEG C) strand, after moment rapid quenching, only a small amount of heat in surface is pulled away, ensure that continuous casting steel billet enter heating furnace before mean temperature be greater than 750 DEG C.
accompanying drawing illustrates:
Accompanying drawing 1 is the front view of apparatus of the present invention.
Accompanying drawing 2 is left views of apparatus of the present invention.
In figure: 1-nozzle pipe arrangement, 2-support, 3-nozzle, 4-conveying roller.
detailed description of the invention:
for a better understanding of the present invention, below in conjunction with accompanying drawing, technical scheme of the present invention is further described.
embodiment 1:
Continuous casting slab specification is 250mm × 1820mm, and pulling rate is 1.05m/min, steel grade Q550D.
As shown in Figure of description, continuous casting cutting rollgang there are three adjacent conveyor rollers 4, upper and lower two groups of nozzle sets are set between adjacent conveying roller 4.Each nozzle sets comprises two rows five and arranges totally 10 nozzles 3, and above conveying roller 4 roll surface, nozzle is that four rows five arrange totally 20, and below roll surface, nozzle is that four rows five arrange totally 20, the nozzle 3 position one_to_one corresponding of upper and lower nozzle sets.Often arrange nozzle 3 and be spaced apart 480mm, upper and lower nozzle 3 is respectively apart from slab upper and lower surface 260mm, and nozzle 3 and steel slab surface angle are 55 °.
Often organize nozzle sets to be made up of nozzle pipe arrangement 1, support 2, nozzle 3, nozzle 3 is connected to water-supply-pipe by nozzle pipe arrangement 1, and nozzle pipe arrangement 1 is supported and fixed between the conveying roller 4 of continuous casting cutting rollgang by support 2.
Nozzle pipe arrangement 1 above conveying roller 4 roll surface of continuous casting cutting rollgang connects upper water-supply-pipe; Nozzle pipe arrangement 1 below roll surface is connected to lower water-supply-pipe.
The total water current amount of upper water-supply-pipe is 700m 3/ h, each nozzle 3 mean allocation water yield, hydraulic pressure is 9bar.
The total water current amount of lower water-supply-pipe is 880m 3/ h, each nozzle 3 mean allocation water yield, hydraulic pressure is 9bar.
Measured by infrared temperature-measuring gun, after slab quenching, upper surface temperature is 522 DEG C instantaneously, and underlaying surface temperature is 531 DEG C, and it is 769 DEG C that slab enters the temperature before heating furnace, and in heating furnace, the heat time is 1h11min, and after rolling, steel plate is on inspection without crizzle.
embodiment 2:
Continuous casting slab specification is 250mm × 2200mm, and pulling rate is 0.90m/min, steel grade Q295NHB.
Continuous casting cutting rollgang there are three adjacent conveyor rollers 4, upper and lower two groups of nozzle sets are set between adjacent conveying roller 4.Each nozzle sets comprises two rows six and arranges totally 12 nozzles 3, and above conveying roller 4 roll surface, nozzle is that four rows six arrange totally 24, and below roll surface, nozzle is that four rows six arrange totally 24, the nozzle 3 position one_to_one corresponding of upper and lower nozzle sets.Often arrange nozzle 3 and be spaced apart 480mm, upper and lower nozzle 3 is respectively apart from slab upper and lower surface 280mm, and nozzle 3 and steel slab surface angle are 50 °.
Often organize nozzle sets to be made up of nozzle pipe arrangement 1, support 2, nozzle 3, nozzle 3 is connected to water-supply-pipe by nozzle pipe arrangement 1, and nozzle pipe arrangement 1 is supported and fixed between the conveying roller 4 of continuous casting cutting rollgang by support 2.
Nozzle pipe arrangement 1 above conveying roller 4 roll surface of continuous casting cutting rollgang connects upper water-supply-pipe; Nozzle pipe arrangement 1 below roll surface is connected to lower water-supply-pipe.
The total water current amount of upper water-supply-pipe is 720m 3/ h, each nozzle 3 mean allocation water yield, hydraulic pressure is 11bar.
The total water current amount of lower water-supply-pipe is 900m 3/ h, each nozzle 3 mean allocation water yield, hydraulic pressure is 11bar.
Measured by infrared temperature-measuring gun, after slab quenching, upper surface temperature is 493 DEG C instantaneously, and underlaying surface temperature is 508 DEG C, and it is 781 DEG C that slab enters the temperature before heating furnace, and in heating furnace, the heat time is 1h19min, and after rolling, steel plate is on inspection without crizzle.
embodiment 3:
Continuous casting slab specification is 250mm × 1820mm, and pulling rate is 1.10m/min, steel grade Q460C.
Continuous casting cutting rollgang there are three adjacent conveyor rollers 4, upper and lower two groups of nozzle sets are set between adjacent conveying roller 4.Each nozzle sets comprises three rows five and arranges totally 15 nozzles 3, and above conveying roller 4 roll surface, nozzle is that six rows five arrange totally 30, and below roll surface, nozzle is that six rows five arrange totally 30, the nozzle 3 position one_to_one corresponding of upper and lower nozzle sets.Often arrange nozzle 3 and be spaced apart 300mm, upper and lower nozzle 3 is respectively apart from slab upper and lower surface 300mm, and nozzle 3 and steel slab surface angle are 45 °.
Often organize nozzle sets to be made up of nozzle pipe arrangement 1, support 2, nozzle 3, nozzle 3 is connected to water-supply-pipe by nozzle pipe arrangement 1, and nozzle pipe arrangement 1 is supported and fixed between the conveying roller 4 of continuous casting cutting rollgang by support 2.
Nozzle pipe arrangement 1 above conveying roller 4 roll surface of continuous casting cutting rollgang connects upper water-supply-pipe; Nozzle pipe arrangement 1 below roll surface is connected to lower water-supply-pipe.
The total water current amount of upper water-supply-pipe is 710m 3/ h, each nozzle 3 mean allocation water yield, hydraulic pressure is 10bar.
The total water current amount of lower water-supply-pipe is 880m 3/ h, each nozzle 3 mean allocation water yield, hydraulic pressure is 10bar.
Measured by infrared temperature-measuring gun, after slab quenching, upper surface temperature is 519 DEG C instantaneously, and underlaying surface temperature is 521 DEG C, and it is 753 DEG C that slab enters the temperature before heating furnace, and in heating furnace, the heat time is 1h43min, and after rolling, steel plate is on inspection without crizzle.
embodiment 4:
Continuous casting slab specification is 250mm × 2200mm, and pulling rate is 0.85m/min, steel grade Q690D.
Continuous casting cutting rollgang there are three adjacent conveyor rollers 4, upper and lower two groups of nozzle sets are set between adjacent conveying roller 4.Each nozzle sets comprises three rows seven and arranges totally 10 nozzles 3, and above conveying roller 4 roll surface, nozzle is that six rows seven arrange totally 42, and below roll surface, nozzle is that six rows seven arrange totally 42, the nozzle 3 position one_to_one corresponding of upper and lower nozzle sets.Often arrange nozzle 3 and be spaced apart 300mm, upper and lower nozzle 3 is respectively apart from slab upper and lower surface 320mm, and nozzle 3 and steel slab surface angle are 60 °.
Often organize nozzle sets to be made up of nozzle pipe arrangement 1, support 2, nozzle 3, nozzle 3 is connected to water-supply-pipe by nozzle pipe arrangement 1, and nozzle pipe arrangement 1 is supported and fixed between the conveying roller 4 of continuous casting cutting rollgang by support 2.
Nozzle pipe arrangement 1 above conveying roller 4 roll surface of continuous casting cutting rollgang connects upper water-supply-pipe; Nozzle pipe arrangement 1 below roll surface is connected to lower water-supply-pipe.
The total water current amount of upper water-supply-pipe is 720m 3/ h, each nozzle 3 mean allocation water yield, hydraulic pressure is 12bar.
The total water current amount of lower water-supply-pipe is 900m 3/ h, each nozzle 3 mean allocation water yield, hydraulic pressure is 12bar.
Measured by infrared temperature-measuring gun, after slab quenching, upper surface temperature is 487 DEG C instantaneously, and underlaying surface temperature is 499 DEG C, and it is 765 DEG C that slab enters the temperature before heating furnace, and in heating furnace, the heat time is 1h32min, and after rolling, steel plate is on inspection without crizzle.

Claims (2)

1. a slab surface quenching unit, is characterized in that, between the conveying roller that continuous casting cutting rollgang is adjacent, arrange upper and lower two groups of nozzle sets;
Each nozzle sets comprises and is parallel to conveying roller direction 1-3 and arranges, perpendicular to the nozzle that conveying roller direction 4-10 arranges; Often arranging nozzle pitch is 450-600mm, and the nozzle of upper and lower nozzle sets is respectively apart from the upper and lower surface 250-330mm of slab, and nozzle and steel slab surface angle are 45 °-65 °;
Often organize nozzle sets to be made up of nozzle pipe arrangement, support, nozzle, nozzle is connected to water-supply-pipe by nozzle pipe arrangement, and nozzle pipe arrangement is supported and fixed between the conveying roller of continuous casting cutting rollgang by support; Nozzle pipe arrangement above the conveying roller roll surface of continuous casting cutting rollgang connects upper water-supply-pipe; Nozzle pipe arrangement below roll surface is connected to lower water-supply-pipe; The total water current amount of upper water-supply-pipe is 700-720m 3/ h, each nozzle mean allocation water yield, hydraulic pressure is 10-12bar, and the total water current amount of lower water-supply-pipe is 880-900m 3/ h, each nozzle mean allocation water yield, hydraulic pressure is 10-12bar.
2. slab surface quenching unit according to claim 1, is characterized in that, each nozzle sets comprises two rows five and arranges totally 10 nozzles, the nozzle location one_to_one corresponding of upper and lower nozzle sets.
CN201310255325.XA 2013-06-25 2013-06-25 Continuous casting plate blank surface quenching technology and used device CN103302262B (en)

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Publication number Priority date Publication date Assignee Title
CN106541099A (en) * 2016-11-26 2017-03-29 湖南华菱湘潭钢铁有限公司 It is a kind of to avoid the red method for sending straight dress crackle of surface of steel plate
CN107326161B (en) * 2017-05-26 2019-06-07 邢台钢铁有限责任公司 A kind of control method of medium carbon cold heading steel wire rod Widmannstatten structure
CN109957639A (en) * 2019-04-29 2019-07-02 北京勤泽鸿翔冶金科技有限公司 A kind of surface treatment method of continuous casting billet

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1107765A (en) * 1993-10-29 1995-09-06 丹尼利机械厂联合股票公司 Method for thermal surface treatment in a continuous casting machine and relative device
CN1192171A (en) * 1995-07-31 1998-09-02 曼内斯曼股份公司 Method and device for operating a continuous casting plant
CN102019390A (en) * 2010-12-31 2011-04-20 山东泰山钢铁集团有限公司 Online austenitic stainless steel continuous casting plate blank water-spraying cooling method and special device thereof
CN102228968A (en) * 2011-06-20 2011-11-02 重庆大学 Method for implementing direct conveying and charging of high-strength low alloy steel continuously-cast bloom
JP2013027900A (en) * 2011-07-28 2013-02-07 Nippon Steel & Sumitomo Metal Corp Method for manufacturing cast slab by continuous casting and apparatus for manufacturing the same
CN203284429U (en) * 2013-06-25 2013-11-13 济钢集团有限公司 Continuous casting slab surface quenching device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1107765A (en) * 1993-10-29 1995-09-06 丹尼利机械厂联合股票公司 Method for thermal surface treatment in a continuous casting machine and relative device
CN1192171A (en) * 1995-07-31 1998-09-02 曼内斯曼股份公司 Method and device for operating a continuous casting plant
CN102019390A (en) * 2010-12-31 2011-04-20 山东泰山钢铁集团有限公司 Online austenitic stainless steel continuous casting plate blank water-spraying cooling method and special device thereof
CN102228968A (en) * 2011-06-20 2011-11-02 重庆大学 Method for implementing direct conveying and charging of high-strength low alloy steel continuously-cast bloom
JP2013027900A (en) * 2011-07-28 2013-02-07 Nippon Steel & Sumitomo Metal Corp Method for manufacturing cast slab by continuous casting and apparatus for manufacturing the same
CN203284429U (en) * 2013-06-25 2013-11-13 济钢集团有限公司 Continuous casting slab surface quenching device

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