CN106513612A - Heavy rail steel continuous casting method - Google Patents

Heavy rail steel continuous casting method Download PDF

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Publication number
CN106513612A
CN106513612A CN201611028071.8A CN201611028071A CN106513612A CN 106513612 A CN106513612 A CN 106513612A CN 201611028071 A CN201611028071 A CN 201611028071A CN 106513612 A CN106513612 A CN 106513612A
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China
Prior art keywords
heavy rail
roller
drafts
rail steel
cooling
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CN201611028071.8A
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Chinese (zh)
Inventor
吴国荣
马晓涛
祭程
陈永
杨文中
曾建华
潘红
陈雄
谢鑫
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Priority to CN201611028071.8A priority Critical patent/CN106513612A/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
    • B22D11/16—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
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • 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

Abstract

The invention relates to a heavy rail steel continuous casting method and belongs to the technical field of rail continuous casting. By adoption of the heavy rail steel continuous casting method, the center density of a heavy rail steel casting blank can be increased. The heavy rail steel continuous casting method comprises the following steps that a, the casting blank is obtained through pouring; b, the solidified tail end of the casting blank is pressed by flat rollers; c, after the solidified tail end of the casting blank is pressed by the flat rollers, the tail end of the casting blank is deeply pressed by convex rollers; and d, cooling is conducted, specifically, the specific water flow is 0.40kg to 0.50kg per ton of steel, the surface of the casting blank in the straightening area is controlled at 800-900 DEG C, and the heavy rail steel casting blank is obtained after cooling. By adoption of the heavy rail steel continuous casting method, the center density of the heavy rail steel casting blank can be greatly increased, and therefore the product percent of pass of the produced heavy rail steel is increased, the production cost is lowered, the production efficiency is improved, and the heavy rail steel continuous casting method has wide market application prospects.

Description

A kind of Properties of Heavy Rail Steel continuous cast method
Technical field
The present invention relates to a kind of Properties of Heavy Rail Steel continuous cast method, belongs to rail continuous casting technology field.
Background technology
Properties of Heavy Rail Steel is to produce the steel grade that nominal weight is more than or equal to 30kg/m rail, and China is primarily referred to as producing 60kg/m The steel grade that the heavy rail (containing track switch) of～75kg/m is used.Heavy rail to be born pressure when rolling stock runs, shock loading and be rubbed The effect of power is wiped, so its prescription to strand and stocking is very strict, in especially must assure that strand and stocking Heart consistency.Otherwise be easy for defect being cracked in punching course, make product rejection.Therefore how to improve in Properties of Heavy Rail Steel strand Heart consistency is one of key technology of continuous casting such steel grade.
Patent CN201210503475.3 " a kind of big Reduction Technology for improving extra-thick plate blank center segregation and center porosity " Disclose a kind of big Reduction Technology for improving extra-thick plate blank center segregation and center porosity, it is characterised in that：Slab Solidification The oil cylinder working-pressure of the 3 fan-shaped section hydraulic cylinders in end is 1800-2500KN；According to steel grade coagulating property, control molten steel overheat exists 10-35 DEG C, between 0.6m/min-1.0m/min, it is 0.4-0.6L/kg to control two cold-zone specific waters to casting machine pulling rate, wherein One fan-shaped section implements big pressure, and drafts is 5.0-12.0mm, and other two fan-shaped sections implement slighter compress, drafts 2-3mm. The patent has certain benefit mainly for extra-thick plate blank, the improvement to extra-thick plate blank quality, not for square billet or heavy rail billet Central dense degree propose technical improvements.
Patent CN200710048924.9 " dynamic soft reduction technologies for bloom continuous casting of heavy rail " is related in bearing steel production Bloom continuous casting slighter compress technique, method is as follows：Wick-containing solidification shrinkage is compensated according to slighter compress drafts and could eliminate center Segregation and loose basic principle, respectively depress casting billet surface drafts a little in line computation, so that it is determined that respectively drawing sedan-chair machine frame Fixed value of roller slit is issued to one-level Basic automation control system by fixed value of roller slit, and remote adjustment draws sedan-chair machine roll gap, is realized light Pressure.Using the specific targets for improving slab quality after the present invention it is：Center segregation of casting blank≤1.0 grade, strand Central Carbon Segregation Index 0.95-1.10, average 1.05；Can obviously improve bearing steel strand center porosity and central pipe, strand center porosity≤ 1.0 grades, ratio reaches more than 90%, central pipe≤0.5 grade, using it is of the invention it is significant mitigate bloom center segregation, in The defects such as the heart is loose, central pipe.
The content of the invention
The technical problem to be solved is to provide a kind of weight of the central dense degree that can improve Properties of Heavy Rail Steel strand Rail steel continuous cast method.
Properties of Heavy Rail Steel continuous cast method of the present invention includes Properties of Heavy Rail Steel strand preparation process, and its Properties of Heavy Rail Steel strand is prepared including following step Suddenly：
A, cast obtain strand：Open from molten steel from the beginning of pouring, ladle to tundish, tundish to crystallizer are using whole plus guarantor Protecting pipe molding casting, and casting machine pulling rate is controlled between 0.5m/min～0.75m/min, crystallizer, solidification end carry out electricity Magnetic is stirred；
B, the pressure of casting blank solidification end plain-barreled roll：Drafts can be calculated by following formula
Wherein, RiIt is the surface drafts of i-th withdrawal straightening machine, mm；ΔAiIt is strand between i-th and the i-th -1 depressing position Solidification shrinkage cross-sectional area, mm2；XiIt is the strand width under i-th withdrawal straightening machine, mm；ρlIt is molten steel density, kg/m3；ηiIt is i-th Pressure efficiency under individual withdrawal straightening machine；ΔAiIt is calculated according to solidification and heat transfer model, ηiAccording to viscoelastic plasticity thermal influence zone meter Obtain；In addition to pressure efficiency, all other are calculated the drafts that feeding is needed for wick-containing drafts, i.e. wick-containing；
Design parameter is controlled to：Soft reduction rate is 0.8～2.4mm/min, and during pressure, pulling rate is 0.5m/min～0.75m/ Min, pressure range length are 4.0m～8.0m, and pressure roller quantity is 4～5, single roller maximum reduction be 5.0mm～ 6.5mm；
C, the big pressure of end convex roller (convex roller roll shape is as shown in Figure 1)：After the pressure of casting blank solidification end plain-barreled roll terminates, adopt Convex roller carries out the big pressure of end convex roller, and convex roller Soft reduction rate is 3～8mm/min, pressure range length be 1.0m～ 2.0m, drafts are 10.0mm-15.0mm；
D, cooling：Specific water is 0.40kg/t steel～0.50kg/t steel；And strand is kept in aligning area surface temperature control Make at 800 DEG C～900 DEG C, to ensure good cc billet surface quality；Properties of Heavy Rail Steel strand is obtained after cooling.
Wherein, in order that also to control Metal in Tundish in the central dense Du Genggao of steel strand, a step casting process overheated Spend for 20 DEG C～30 DEG C.
Further, in a steps of said method, crystallizer preferably adopts the electromagnetic agitation of 600A, 2.4Hz, solidification end It is preferred that using the electromagnetic agitation of 350A, 7Hz.
Further, in order that the central dense Du Genggao of steel strand, it is 6 that roller sum is depressed in b, step c, and wick-containing is arrived Start the slighter compress that puts into operation during the 2nd pulling-straightening roller, overall reduction 22.3mm～30.0mm, wherein, 2# roller 0.8～1.2mm of drafts, 3# roller 1.5～2mm of drafts, 4# roller 3.5～4.5mm of drafts, 5# roller 3.5～5mm of drafts, 6# rollers drafts 3.0～ 4.0mm, 7# convex roller 10.0～15.0mm of drafts.
Further, in order that the central dense Du Genggao of steel strand, preferably cold using 4th area of cooling in above-mentioned Step d But, area's water yield accounts for 13～15%, 145～150L/ of intensity of cooling (min m2)；Two area's water yields account for 23～25%, intensity of cooling 32～37L/ (min m2)；Three area's water yields account for 18～20%, 22～27L/ of intensity of cooling (min m2)；Four area's water yields account for 40～ 45%, 15～17L/ of intensity of cooling (min m2)。
The inventive method can greatly improve the central dense degree of Properties of Heavy Rail Steel strand, so as to improve produced Properties of Heavy Rail Steel Conforming product rate, reduces manufacturing cost, improves production efficiency, and the inventive method has wide market application foreground.
Description of the drawings
Fig. 1 is convex roller roll shape figure.
Specific embodiment
Properties of Heavy Rail Steel continuous cast method of the present invention includes Properties of Heavy Rail Steel strand preparation process, and its Properties of Heavy Rail Steel strand is prepared including following step Suddenly：
A, cast obtain strand：Open from molten steel from the beginning of pouring, ladle to tundish, tundish to crystallizer are using whole plus guarantor Protecting pipe molding casting, and casting machine pulling rate is controlled between 0.5m/min～0.75m/min, crystallizer, solidification end carry out electricity Magnetic is stirred；
B, the pressure of casting blank solidification end plain-barreled roll：Drafts can be calculated by following formula
Wherein, RiIt is the surface drafts of i-th withdrawal straightening machine, mm；ΔAiIt is strand between i-th and the i-th -1 depressing position Solidification shrinkage cross-sectional area, mm2；XiIt is the strand width under i-th withdrawal straightening machine, mm；ρlIt is molten steel density, kg/m3；ηiIt is i-th Pressure efficiency under individual withdrawal straightening machine；ΔAiIt is calculated according to solidification and heat transfer model, ηiAccording to viscoelastic plasticity thermal influence zone meter Obtain；In addition to pressure efficiency, all other are calculated the drafts that feeding is needed for wick-containing drafts, i.e. wick-containing；
Design parameter is controlled to：Soft reduction rate is 0.8～2.4mm/min, and during pressure, pulling rate is 0.5m/min～0.75m/ Min, pressure range length are 4.0m～8.0m, and pressure roller quantity is 4～5, single roller maximum reduction be 5.0mm～ 6.5mm；
C, the big pressure of end convex roller：After the pressure of casting blank solidification end plain-barreled roll terminates, end convex is carried out using convex roller The big pressure of roller, convex roller Soft reduction rate are 3～8mm/min, and pressure range length is 1.0m～2.0m, and drafts is 10.0mm- 15.0mm；
D, cooling：Specific water is 0.40kg/t steel～0.50kg/t steel；And strand is kept in aligning area surface temperature control Make at 800 DEG C～900 DEG C, to ensure good cc billet surface quality；Properties of Heavy Rail Steel strand is obtained after cooling.
Wherein, in order that also to control Metal in Tundish in the central dense Du Genggao of steel strand, a step casting process overheated Spend for 20 DEG C～30 DEG C.
Further, in a steps of said method, crystallizer preferably adopts the electromagnetic agitation of 600A, 2.4Hz, solidification end It is preferred that using the electromagnetic agitation of 350A, 7Hz.
Further, in order that the central dense Du Genggao of steel strand, it is 6 that roller sum is depressed in b, step c, and wick-containing is arrived Start the slighter compress that puts into operation during the 2nd pulling-straightening roller, overall reduction 22.3mm～30.0mm, wherein, 2# roller 0.8～1.2mm of drafts, 3# roller 1.5～2mm of drafts, 4# roller 3.5～4.5mm of drafts, 5# roller 3.5～5mm of drafts, 6# rollers drafts 3.0～ 4.0mm, 7# convex roller 10.0～15.0mm of drafts.
Further, in order that the central dense Du Genggao of steel strand, preferably cold using 4th area of cooling in above-mentioned Step d But, area's water yield accounts for 13～15%, 145～150L/ of intensity of cooling (min m2)；Two area's water yields account for 23～25%, intensity of cooling 32～37L/ (min m2)；Three area's water yields account for 18～20%, 22～27L/ of intensity of cooling (min m2)；Four area's water yields account for 40～ 45%, 15～17L/ of intensity of cooling (min m2)。
The specific embodiment of the present invention is further described with reference to embodiment, not therefore by present invention limit System is among described scope of embodiments.
Embodiment 1 improves 45# steel strand central dense degree using the inventive method
45# steel bloom of the continuous casting cross dimension for 360mm × 450mm, casting machine pulling rate are 0.55m/min, and Pulling rate is kept to stablize constant, the Metal in Tundish degree of superheat is 25 DEG C, and casting process employs two cold dynamic controls, Water Rate for Secondary Cooling Water For 0.42kg/tSteel；One area's water yield accounts for 13～15%, 145～150L/ of intensity of cooling (min m2)；Two area's water yields account for 23～ 25%, 32～37L/ of intensity of cooling (min m2)；Three area's water yields account for 18～20%, 22～27L/ of intensity of cooling (min m2)；Four Area's water yield accounts for 40～45%, 15～17L/ of intensity of cooling (min m2).Using the big press control of solidification end, Soft reduction rate is Pressure range length is 7.7m, and pressure roller number is 6, overall reduction 27.5mm, 2# roller drafts 1.0mm, 3# roller drafts 1.5mm, 4# roller drafts 4.0mm, 5# roller drafts 4.0mm, 6# roller drafts 4.0mm, 7# convex roller drafts 13.0mm.
After being poured, macroscopic examination is carried out to bloom Inner Quality of Billet, inspection result shows, the horizontal low power of strand Non-stop layer shrinkage cavity, centre burst defect, center porosity defect are rated≤1.0 grades.
Comparative example produces U78CrV Properties of Heavy Rail Steel strands using existing method
U78CrV bloom of the continuous casting cross dimension for 320mm × 410mm, casting machine pulling rate are 0.72m/min, and Pulling rate is kept to stablize constant, the Metal in Tundish degree of superheat is 20 DEG C, and casting process employs two cold dynamic controls, Water Rate for Secondary Cooling Water For 0.45kg/tSteel.Using the big press control of solidification end, it is 7.7m that Soft reduction rate is pressure range length, and pressure roller number is 6 It is individual, overall reduction 13.5mm, 2# roller drafts 1.0mm, 3# roller drafts 2.0mm, 4# roller drafts 3.0mm, 5# roller drafts 4.5mm, 6# roller drafts 2.0mm, 7# rollers (conventional roller) drafts 1.0mm.
After being poured, macroscopic examination is carried out to bloom Inner Quality of Billet, inspection result shows, the horizontal low power of strand Non-stop layer shrinkage cavity ratio only 70%, center porosity defect≤1.0 grades of ratios of grading are 68%, the ratio of center segregation≤0.5 grade For 64%, 55% is reached because strand center porosity, center segregation effectively cause axle steel and change steel rate.

Claims (5)

1. Properties of Heavy Rail Steel continuous cast method, including Properties of Heavy Rail Steel strand preparation process, it is characterised in that Properties of Heavy Rail Steel strand is prepared including as follows Step：
A, cast obtain strand：Open from molten steel from the beginning of pouring, ladle to tundish, tundish to crystallizer are using whole plus protective case Protection of pipe is poured into a mould, and controls casting machine pulling rate between 0.5m/min～0.75m/min, and crystallizer, solidification end carry out electromagnetism and stir Mix；
B, the pressure of casting blank solidification end plain-barreled roll：Drafts can be calculated by following formula
R i = ΔA i η i · X i = ( ∫ 0 Y i ∫ 0 X i ρ ( x , y , z i ) d x d y - ∫ 0 Y i - 1 ∫ 0 X i - 1 ρ ( x , y , z i - 1 ) d x d y ) ρ l · η i · X i
Wherein, RiIt is the surface drafts of i-th withdrawal straightening machine, mm；ΔAiIt is casting blank solidification between i-th and the i-th -1 depressing position Constricted cross section is accumulated, mm2；XiIt is the strand width under i-th withdrawal straightening machine, mm；ρlIt is molten steel density, kg/m3；ηiIt is i-th drawing Pressure efficiency under strong machine；ΔAiIt is calculated according to solidification and heat transfer model, ηiCalculated according to viscoelastic plasticity thermal influence zone Arrive；In addition to pressure efficiency, all other are calculated the drafts that feeding is needed for wick-containing drafts, i.e. wick-containing；
Design parameter is controlled to：Soft reduction rate is 0.8～2.4mm/min, and during pressure, pulling rate is 0.5m/min～0.75m/min, Pressure range length is 4.0m～8.0m, and pressure roller quantity is 4～5, and single roller maximum reduction is 5.0mm～6.5mm；
C, the big pressure of end convex roller：After the pressure of casting blank solidification end plain-barreled roll terminates, end convex roller is carried out using convex roller big Pressure, convex roller Soft reduction rate are 3～8mm/min, and pressure range length is 1.0m～2.0m, and drafts is 10.0mm- 15.0mm；
D, cooling：Specific water is 0.40kg/t steel～0.50kg/t steel；And keep strand to exist in aligning area surface temperature control 800 DEG C～900 DEG C；Properties of Heavy Rail Steel strand is obtained after cooling.
2. Properties of Heavy Rail Steel continuous cast method according to claim 1, it is characterised in that：In the middle of also controlling in a step casting process Bag molten steel overheat is 20 DEG C～30 DEG C.
3. Properties of Heavy Rail Steel continuous cast method according to claim 1 and 2, it is characterised in that：In a steps crystallizer using 600A, The electromagnetic agitation of 2.4Hz, electromagnetic agitation of the solidification end using 350A, 7Hz.
4. Properties of Heavy Rail Steel continuous cast method according to claim 1, it is characterised in that：It is 6 that roller sum is depressed in b, step c It is individual, start the slighter compress that puts into operation when wick-containing is to the 2nd pulling-straightening roller, overall reduction 22.3mm～30.0mm, wherein, 2# roller drafts 0.8～1.2mm, 3# roller 1.5～2mm of drafts, 4# roller 3.5～4.5mm of drafts, 5# roller 3.5～5mm of drafts, 6# roll-ins 3.0～4.0mm of lower amount, 7# convex roller 10.0～15.0mm of drafts.
5. Properties of Heavy Rail Steel continuous cast method according to claim 1, it is characterised in that：Using the cooling of 4th area of cooling in Step d, One area's water yield accounts for 13～15%, 145～150L/ of intensity of cooling (min m2)；Two area's water yields account for 23～25%, intensity of cooling 32 ～37L/ (min m2)；Three area's water yields account for 18～20%, 22～27L/ of intensity of cooling (min m2)；Four area's water yields account for 40～ 45%, 15～17L/ of intensity of cooling (min m2)。
CN201611028071.8A 2016-11-16 2016-11-16 Heavy rail steel continuous casting method Pending CN106513612A (en)

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CN106925738B (en) * 2017-04-01 2019-11-22 唐山钢铁集团有限责任公司 The method for improving low-alloy high-tensile structural steel wide thickness plate continuous casting base homogeneity
CN107081413A (en) * 2017-04-01 2017-08-22 唐山钢铁集团有限责任公司 The method for improving Steels for High Rise Buildings continuous casting billet central dense degree
CN106925738A (en) * 2017-04-01 2017-07-07 唐山钢铁集团有限责任公司 The method for improving low-alloy high-tensile structural steel wide thickness plate continuous casting base homogeneity
CN107309410A (en) * 2017-06-07 2017-11-03 唐山钢铁集团有限责任公司 The continuous cast method of steel for resisting sulfuric acid dew point corrosion
CN107377919A (en) * 2017-07-20 2017-11-24 东北大学 A kind of method for improving bearing steel strand central dense degree
CN109550916A (en) * 2017-09-25 2019-04-02 上海梅山钢铁股份有限公司 A method of control high-carbon fine steel continuous casting steel billet interior tissue and crackle
CN107671257A (en) * 2017-10-12 2018-02-09 攀钢集团攀枝花钢铁研究院有限公司 A kind of continuous casting billet production method for low compression ratio rolling
CN110871265A (en) * 2018-08-31 2020-03-10 宝山钢铁股份有限公司 Soft reduction method for combination of flat roll and convex roll of continuous casting bloom
KR20210053308A (en) * 2018-08-31 2021-05-11 바오샨 아이론 앤 스틸 유한공사 Light pressure reduction method combining large bloom continuous casting flat roll and convex roll
CN110871265B (en) * 2018-08-31 2021-08-13 宝山钢铁股份有限公司 Soft reduction method for combination of flat roll and convex roll of continuous casting bloom
EP3845330A4 (en) * 2018-08-31 2021-09-22 Baoshan Iron & Steel Co., Ltd. Light reduction method for continuous casting of bloom plain-barrelled roll-roller combination
US11207729B2 (en) 2018-08-31 2021-12-28 Baoshan Iron & Steel Co., Ltd. Light reduction method for continuous casting of bloom plain-barrelled roll-roller combination
KR102417154B1 (en) * 2018-08-31 2022-07-07 바오샨 아이론 앤 스틸 유한공사 Light pressure reduction method combining large bloom continuous casting flat rolls and convex rolls
CN113828745A (en) * 2021-08-31 2021-12-24 南京钢铁股份有限公司 Bloom continuous casting production method of high-strength steel for motor car brake disc
CN113828745B (en) * 2021-08-31 2023-03-21 南京钢铁股份有限公司 Bloom continuous casting production method of high-strength steel for motor car brake disc

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