CN105603300A - Center segregation control method of phi280mm 35CrMo circular tube blank - Google Patents

Center segregation control method of phi280mm 35CrMo circular tube blank Download PDF

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Publication number
CN105603300A
CN105603300A CN201610172762.9A CN201610172762A CN105603300A CN 105603300 A CN105603300 A CN 105603300A CN 201610172762 A CN201610172762 A CN 201610172762A CN 105603300 A CN105603300 A CN 105603300A
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Prior art keywords
molten steel
refining
controlled
argon
center segregation
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CN201610172762.9A
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Inventor
李红光
陈天明
郭华
李扬洲
陈亮
郭奠荣
杨文中
李志强
冯远超
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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 CN201610172762.9A priority Critical patent/CN105603300A/en
Publication of CN105603300A publication Critical patent/CN105603300A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10Supplying or treating molten metal
    • B22D11/11Treating the molten metal
    • B22D11/114Treating the molten metal by using agitating or vibrating means
    • B22D11/115Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28Manufacture of steel in the converter
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/072Treatment with gases
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10Handling in a vacuum
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/08Ferrous alloys, e.g. steel alloys containing nickel
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/16Ferrous alloys, e.g. steel alloys containing copper
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium

Abstract

The invention discloses a center segregation control method for producing a 35CrMo circular tube steel casting blank with the cross section of phi280mm, belonging to the field of metallurgy. The method comprises the following steps: converter smelting, LF (ladle furnace) refining of molten steel, RH refining, continuous casting of molten steel and the like. The key technology is characterized in that a crystallizer electromagnetic stirring-final electromagnetic stirring combined technique is adopted in the continuous casting stage. The reasonable parameter control is performed in the molten steel smelting stage to enhance the purity of molten steel and achieve the optimal outbound conditions; in the molten steel casting process, the crystallizer electromagnetic stirring-final electromagnetic stirring combined mode is adopted, so that the molten steel components are uniformized; the casting is carried out at lower temperature, so that the blank shell grows uniformly; and thus, the columnar crystal structure is continuously eroded and blown out in the stirring process, the equiaxed grain nucleation rate is enhanced, and the columnar crystal growth is inhibited, thereby avoiding or reducing the center segregation of the casting blank.

Description

The 35CrMo circular pipe blank center segregation control method of φ 280mm
Technical field
The present invention relates to Ferrous Metallurgy field, relate in particular to a kind of 35CrMo pipe steel strand that section is φ 280mm of producingCenter segregation control method.
Background technology
The steel for oil well pipes that 35CrMo tube blank steel uses mainly for the production of oil-gas mining, transport, chemical constituent by weight percentageFor: C:0.27%~0.32%, Si:0.20%~0.35%, Mn:0.45%~0.65%, P≤0.020%, S≤0.010%, V≤0.015%、Cr::0.85%~1.05%、Mo:0.17%~0.24%、Cu≤0.15%、Ni≤0.20%、Alt:0.020%~0.040%,Residual elements require: Nb≤0.010%, Ti≤0.010%, B≤0.005%, and V+Nb+Ti+B+Zr≤0.15%; As≤0.015%,Sn≤0.010%Sb≤0.010%, Pb≤0.008%, Bi≤0.010%, and As+Sn+Sb+Pb+Bi≤0.045%, surplus is Fe.In use under the acting in conjunction of applied stress and hydrogen sulfide gas, tend to stressed prominent during far below itself yield strengthSo there is brittle failure (being called H 2 S stress corrosion), easily cause the problems such as raw leakage, production and environmental protection are caused to adverse effect.Along with socioeconomic development, the development trends such as the requirement of oil gas conevying efficiency is higher, the increase of exploitation difficulty are constantly carried slab qualityGo out harsher requirement. Much research and analyse and point out, circle base center segregation has material impact to poling lumber recovery and end product quality.Therefore, improve center segregation of casting blank, expand equiax crystal district, center, optimizing casting blank solidification structural homogenity is important with regard to salient pole.
For 35CrMo tube blank steel, the Gao Ge in steel grades, molybdenum content itself have determined strand column crystal development trendLarger, moreover, because casting blank section is relatively large and for justifying base, the less strand heat transfer efficiency of its specific area is lower, solidifies coldSlow, the control of crystalline structure is more difficult. In continuous casting production process, the prosperity of strand column crystal, often causes column crystal dendriteBetween occur bondingly, form confined space, molten steel continues cooled and solidified, volume contraction, and the feeding in time of the outside molten steel in spaceAnd the defects such as formation is loose, segregation.
Summary of the invention
For the deficiencies such as center segregation easily appear in the 35CrMo pipe steel strand that overcomes existing larger cross dimensions, the present invention wantsThe technical problem solving is: providing a kind of is the center segregation controlling party of the 35CrMo pipe steel strand of φ 280mm for sectionMethod.
The technical solution adopted for the present invention to solve the technical problems is:
Producing section is the center segregation control method of the 35CrMo pipe steel strand of φ 280mm, comprises the following steps:
I, converter smelting: converter terminal is controlled according to following mass percent and temperature index, aim carbon 0.05%~0.15%,Terminal phosphorus≤0.010%, outlet temperature >=1670 DEG C, tapping pushing off the slag, controls slag thick in 60mm;
II, the molten steel obtaining in step I is carried out to the refining of LF stove, the omnidistance Argon of refining stirs, and LF departures target is by quality hundredProportion by subtraction [S]≤0.008%, and [P]+[S]≤0.023% controls, and departures Als enters according to mass percent 0.020%~0.040%Row is controlled, and refining finishes at least 5min of rear continuation Argon, and out-station temperature is by 1590~1620 DEG C of controls;
III, the molten steel obtaining in step II is carried out to RH refining, RH refining requires argon flow amount by 1100~1350NL/minControl, vacuum < 3mbar, processing time >=10min, application of vacuum finishes at least 5min of rear continuation Argon, and RH goes out to stand firmHydrogen thermometric, controls according to concentration [H]≤2.0ppm, and out-station temperature is controlled at 1540~1570 DEG C;
IV, continuous casting steel: the mode that continuous casting link adopts M-EMS to combine with solidification end electromagnetic agitation, wherein,The parameter of M-EMS is: stir current 300~400A, 2.4~4Hz; Solidification end stirring parameter is: stirElectric current 250~350A, frequency 5.0~8.0Hz.
Further, in step II and step III, in refining process employing, intensity Argon stirs, and does not occur turning over greatly with molten steel surfaceBoiling is as the criterion; Refining finishes the weak Argon of rear employing stirs, and makes molten steel have faint stirring.
Further, in step IV, carry out also needing to control following parameter in molten steel cast: the degree of superheat is controlled at 25~35DEG C, pulling rate is controlled at 0.85~1.10m/min, the cooling 2450~2650L/min that is controlled at of crystallizer, and two cold specific waters are controlled at0.25~0.35l/kgSteel
The invention has the beneficial effects as follows: first in the smelting molten steel stage according to rational parameter control, improved the degree of purity of molten steelAnd make its departures condition reach best, in the process of pouring molten steel, adopt M-EMS and solidification end electromagnetism subsequentlyThe mode that stirring combines, makes molten steel component homogenising, and adopts lower temperature to pour into a mould, and base shell is evenly grown,Fusing is constantly washed away in whipping process by columanar structure, and equiax crystal nucleation rate improves, and column crystal growth is suppressed, thereby avoidsOr minimizing center segregation of casting blank.
Detailed description of the invention
Below by detailed description of the invention, the invention will be further described, but should not be understood as restriction of the present invention. This areaThose of ordinary skill, according to such scheme, can also be made various forms of amendments, replacement, change. Every based on above-mentioned technologyAmendment, replacement and change that thought is done all belong to scope of the present invention.
Producing section is the center segregation control method of the 35CrMo pipe steel strand of φ 280mm, comprises the following steps:
I, converter smelting: converter terminal is controlled according to following mass percent and temperature index, aim carbon 0.05%~0.15%,Terminal phosphorus≤0.010%, outlet temperature >=1670 DEG C, tapping pushing off the slag, controls slag thick in 60mm;
II, the molten steel obtaining in step I is carried out to the refining of LF stove, the omnidistance Argon of refining stirs, and LF departures target is by quality hundredProportion by subtraction [S]≤0.008%, and [P]+[S]≤0.023% controls, and departures Als enters according to mass percent 0.020%~0.040%Row is controlled, and refining finishes at least 5min of rear continuation Argon, and out-station temperature is by 1590~1620 DEG C of controls;
III, the molten steel obtaining in step II is carried out to RH refining, RH refining requires argon flow amount by 1100~1350NL/minControl, vacuum < 3mbar, processing time >=10min, application of vacuum finishes at least 5min of rear continuation Argon, and RH goes out to stand firmHydrogen thermometric, controls according to concentration [H]≤2.0ppm, and out-station temperature is controlled at 1540~1570 DEG C;
IV, continuous casting steel: the mode that continuous casting link adopts M-EMS to combine with solidification end electromagnetic agitation, wherein,The parameter of M-EMS is: stir current 300~400A, 2.4~4Hz; Solidification end stirring parameter is: stirElectric current 250~350A, frequency 5.0~8.0Hz.
Step I, II, III are mainly that the smelting of molten steel is controlled, and ensure that molten steel has stable characteristic, equal before castEven composition and suitable pouring temperature. Wherein, in converter steelmaking process, be in order to ensure molten steel to the content control of carbon and phosphorusInternal soundness, improve its stability; The refining of LF stove is for molten steel is fully reacted, and removes unnecessary impurity, due to SAll the mechanical performance of steel is had to adverse effect with P, so need the strict content of controlling two kinds of elements, wherein Als is that sour aluminium containsAmount, is conducive to make the crystal grain of steel tiny evenly to the control of Als, can improve its hardenability and quenching degree and plasticity and tough simultaneouslyProperty; RH refining is in order further to improve the degree of purity of molten steel, and makes the composition stable and uniform more of molten steel, is conducive to follow-upWhen continuous casting, form good equiax crystal district, the concentration of controlling hydrogen is in follow-up casting process, to occur hydrogen induced cracking in order to prevent.
Key of the present invention is the continuous casting steel stage in step IV, under normal circumstances, and casting blank solidification tissue in continuous casting process processPresent successively the crystallizer tissue regions in chill fine grained region, columnar zone, equiax crystal district, center from casting billet surface to center. InThe generation of heart segregation is because strand is in process of setting, particularly causes at molten steel mobile that solidifies ot-yet-hardened in latter stage,For improving slab quality, improve center segregation of casting blank, what metallurgy industry generally adopted at present is cast cold and electromagnetic agitating technology.Improvements of the present invention are, employing be the mode that M-EMS combines with solidification end electromagnetic agitation. This skillThe mechanism of action of art is: M-EMS produces electromagnetic torque by magnetic field, changes the inner flow field of molten steel of crystallizer, temperatureField distribution situation, promotes Mold composition, equalizing temperature, weakens the directionality of solidification and heat transfer, promotes that base shell is evenGrowth; Further, solidification end electromagnetic agitation drives flowing of mushy zone molten steel by pressure, columanar structure is washed away moltenDisconnected, improve equiax crystal nucleation rate, suppress column crystals growth, equiax crystal district is expanded, also just avoid the appearance of center segregation.
In LF stove refined molten steel and RH refining process, all adopt Argon to stir, intensity in general employing in refining processArgon stirs, and does not occur turning over greatly boiling be as the criterion with molten steel surface; Refining finishes the weak Argon of rear employing stirs, and makes molten steel have faint stirringMoving. Argon stir be mainly for molten steel can fully be reacted, the composition in molten steel is mixed, be convenient to follow-upIn pouring molten steel process, can form stable solidified structure.
Further, in the time carrying out the continuous casting steel stage, if the control of solidification end electromagnetic agitation intensity is bad, easily cause branchBrilliant tip is washed away seriously, causes the low solute concentration molten steel of the strong mobility of low melting point to be assembled ringwise, forms white band, therefore needsTo accurately control its stirring intensity, in addition in order to ensure the last quality of becoming a useful person, also need in the time carrying out molten steel cast, controlFollowing parameter: the degree of superheat is controlled at 25~35 DEG C, and pulling rate is controlled at 0.85~1.10m/min, crystallizer is cooling to be controlled at2450~2650L/min, two cold specific waters are controlled at 0.25~0.35l/kgSteel. The reasonably degree of superheat, pulling rate match control and two cold strongIt is to the casting blank solidification key of controlling of conducting heat that degree is formulated, and controls these parameters well, and molten steel just can reduce not even in process of settingThere will be center segregation.
Embodiment:
Certain steel mill adopts 120t converter smelting → LF stove refining → RH refining → six machine six to flow the life of casting machine φ 280mm section continuous castingProduce 35CrMo circular pipe blank. Bessemerize while end, aim carbon is 0.11% to control, and terminal phosphorus is 0.007%, terminal temperatureDegree is controlled at 1678 DEG C, and the thick control of ladle slag is 58mm.
Molten steel arrives LF refining furnace place, carries out Argon molten steel and slightly fluctuates, and does not occur turning over greatly phenomenon, and departures Als controls and is0.041%, refining finishes rear molten steel to be carried out to soft blow argon, and argon blowing time is 6.2min, and after LF processing finishes, constant temperature is 1623DEG C, LF departures [S] are 0.005%, [S]+[P] is 0.022%.
After molten steel arrives at a station, RH refining Argon argon flow amount is that 1250NL/min controls, the processing time of vacuum < 3mbar11.5min, RH departures Als is 0.030%, and application of vacuum finishes rear Argon 6min, and the hydrogen that goes out to stand firm is 1.8ppm, out-station temperatureBe controlled at 1570 DEG C.
RH application of vacuum finishes rear allocation and transportation to six machine six flows casting machine φ 280mm section and carries out molten steel casting, requires phase with the present inventionThe critical technical parameter working control of closing is: M-EMS: stir current 350A, stirring frequency 3.4Hz; Solidify endEnd electromagnetic agitation: stir current 300A, stirring frequency 7.0Hz; The actual casting process degree of superheat of molten steel is controlled at 30~35 DEG C;Pulling rate is 1.0m/min; The cooling 2550L/min that is controlled at of crystallizer; Two cold specific waters are controlled at 0.30l/kgSteel
After the stable utilization of above-mentioned technological invention, slab quality is well controlled, and strand low power center segregation testing result is 0.5Level; Spectrum direct-reading segregation testing result is 1.04~1.06.

Claims (3)

1. the 35CrMo circular pipe blank center segregation control method of φ 280mm, is characterized in that, comprises the following steps:
I, converter smelting: converter terminal is controlled according to following mass percent and temperature index, aim carbon 0.05%~0.15%,Terminal phosphorus≤0.010%, outlet temperature >=1670 DEG C, tapping pushing off the slag, controls slag thick in 60mm;
II, the molten steel obtaining in step I is carried out to the refining of LF stove, the omnidistance Argon of refining stirs, and LF departures target is by quality hundredProportion by subtraction [S]≤0.008%, and [P]+[S]≤0.023% controls, and departures Als mass percent is entered according to 0.020%~0.040%Row is controlled, and refining finishes at least 5min of rear continuation Argon, and out-station temperature is by 1590~1620 DEG C of controls;
III, the molten steel obtaining in step II is carried out to RH refining, RH refining requires argon flow amount by 1100~1350NL/minControl, vacuum < 3mbar, processing time >=10min, application of vacuum finishes at least 5min of rear continuation Argon, and RH goes out to stand firmHydrogen thermometric, controls according to concentration [H]≤2.0ppm, and out-station temperature is controlled at 1540~1570 DEG C;
IV, continuous casting steel: the mode that continuous casting link adopts M-EMS to combine with solidification end electromagnetic agitation, wherein,The parameter of M-EMS is: stir current 300~400A, 2.4~4Hz; Solidification end stirring parameter is: stirElectric current 250~350A, frequency 5.0~8.0Hz.
2. the 35CrMo circular pipe blank center segregation control method of φ 280mm as claimed in claim 1, is characterized in that: stepIn rapid II and step III, in refining process employing, intensity Argon stirs, and does not occur turning over greatly boiling be as the criterion with molten steel surface; Refining finishesThe weak Argon of rear employing stirs, and makes molten steel have faint stirring.
3. the 35CrMo circular pipe blank center segregation control method of φ 280mm as claimed in claim 1, is characterized in that:When carrying out molten steel cast in step IV, also need to control following parameter: the degree of superheat is controlled at 25~35 DEG C, and pulling rate is controlled at0.85~1.10m/min, the cooling 2450~2650L/min that is controlled at of crystallizer, two cold specific waters are controlled at 0.25~0.35l/kgSteel
CN201610172762.9A 2016-03-23 2016-03-23 Center segregation control method of phi280mm 35CrMo circular tube blank Pending CN105603300A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111283156A (en) * 2020-03-23 2020-06-16 江苏利淮钢铁有限公司 Method for reducing segregation in casting process of continuous casting square billet for gear

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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
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

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111283156A (en) * 2020-03-23 2020-06-16 江苏利淮钢铁有限公司 Method for reducing segregation in casting process of continuous casting square billet for gear
CN111283156B (en) * 2020-03-23 2021-11-02 江苏利淮钢铁有限公司 Method for reducing segregation in casting process of continuous casting square billet for gear

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Application publication date: 20160525