CN105562642A - Control method for typical middle cracks and center segregation during pipeline steel slab continuous casting - Google Patents
Control method for typical middle cracks and center segregation during pipeline steel slab continuous casting Download PDFInfo
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- CN105562642A CN105562642A CN201510998706.6A CN201510998706A CN105562642A CN 105562642 A CN105562642 A CN 105562642A CN 201510998706 A CN201510998706 A CN 201510998706A CN 105562642 A CN105562642 A CN 105562642A
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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
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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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
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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
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
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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
- 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
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Abstract
The invention belongs to the technical field of steelmaking continuous casting, and relates to a control method for typical middle cracks and center segregation during pipeline steel slab continuous casting. The control method comprises the steps that a roll gap of a casting machine is subjected to offline calibration and online detection, and it is guaranteed that precision is +/-0.2 mm; steel grade grouping is carried out, and matching of steel grades and thermophysical parameters is enhanced; the degree of superheat is strictly controlled, the proportion of equiaxed grains is increased, and developed columnar grains are avoided; a pulling rate and a secondary cooling process are adjusted, and basic roll gap control in the casting slab solidification process is optimized; and the soft press quantity is optimized, two or three segments of press are selected to the greatest extent according to the continuous casting process, and a large press quantity difference is avoided in press distribution between different sector segments. The control method has the beneficial effects that the internal quality of the casting slab is improved, and the product competitiveness is enhanced.
Description
Technical field
The invention belongs to steel-making continuous casting technical field, particularly the control method of a kind of pipe line steel sheet billet continuous casting typical case's middle crack and center segregation.Effectively can reduce the incidence of middle crack defect near a kind of trigonum, significantly improve center segregation level of control, improve the internal soundness of strand.
Background technology
Pipe line steel is mainly for the manufacture of the pipeline of transfer oil, natural gas, and its working environment is usually relatively more severe, and the pressure that pipeline bears is very large, and transportation route is long, difficult in maintenance, therefore, very strict to the quality requirement of pipe line steel.Its performance requirement mainly contains: high strength, high tenacity, excellent resistance against hydrogen cracking (HIC) and stress corrosion dehiscence resistant (SCC) performance and good welding performance.Crack of billet and center segregation are one of defects of severe exacerbation Properties of HIC resistance, therefore must strictly control.
Find in actual production, the defective proportion such as pipe line steel center segregation of casting blank rank high (C class more than 1.5) are higher, and near trigonum, middle crack happens occasionally, and urgently proposes its solution.
Typical case's " middle crack " defect that this patent is paid close attention to mainly is distributed near trigonum, and distance leptoprosopy is about 200mm, is multiplely born in inner arc side, perpendicular to wide of strand, and crack initiation site and final position distance casting blank surface about 90,105mm respectively.According to numerical simulation analysis, near strand trigonum there is maximum principal strain peak region in solidification front, and this peak region corresponds to fan-shaped section roll line and strand contact position place.When the factor controllings such as pulling speed of continuous casting, process for cooling, soft reduction process, equipment state are unreasonable, strand pressure fan-shaped section may with aligning area overlapping, under the comprehensive function of straightening force, depressing force, other mechanical forces caused because of roller distortion or misalign, bulge power, be easy to occur described middle crack near strand widthwise central side near above-mentioned trigonum.With segregation problems centered by the internal soundness defect of this defect association, under above-mentioned complex device condition, be difficult to the Actual Control Effect of Strong ensureing target soft reduction process, very likely cause Inner Quality of Billet center segregation to control not good.
The key factor affecting dynamic soft-reduction technique has: depressing position accuracy, slighter compress amount size, equipment control accuracy.First, for verifying the online heat-tracking model accuracy of casting machine, carried out nailing test, result shows that actual thickness of solidified slab shell in secondary and the model calculation exist certain deviation, and this must cause depressing position to be forbidden, and then it is not good to cause center segregation to improve; Secondly, the slighter compress amount of different steel grade can obtain according to its solidification shrinkage property calculation, but be subject to the impact of base shell resistance capacity to deformation, under identical drafts condition, the pressure efficiency of different steel grade strand is not quite similar, and therefore needs suitably to adjust its overall reduction according to typical steel grade; Finally, the key factor of impact pressure effect is the gap preset precision of fan-shaped section, is substantially in obvious overgauge, and reaches+0.5 ~ 1.5mm, have a strong impact on slighter compress effect in the actual roll gap deviation in fan-shaped section online later stage.
Shoudu Iron and Steel Co is one of domestic main pipe line steel manufacturing enterprise, constantly pursues the lasting lifting of product quality.Shoudu Iron and Steel Co technical staff developed by proprietary technology, defines the continuous casting process that a whole set of is applicable to slab production flow line steel internal quality control, propose the control method of typical middle crack and center segregation.
Summary of the invention
The object of the present invention is to provide the control method of a kind of pipe line steel sheet billet continuous casting typical case's middle crack and center segregation.Solve and play light compression technology, while reducing strand middle crack, significantly improve the problem of center segregation of casting blank level of control.Achieve the incidence effectively reducing middle crack defect near a kind of trigonum, significantly improve center segregation level of control, improve the internal soundness of strand, strengthen the competitiveness of product.
Pipe line steel sheet billet continuous casting typical case's middle crack and the control method of center segregation, concrete steps and parameter as follows:
1, off-line calibration and on-line checkingi are carried out to casting machine roll gap, avoid the overgauge in fan-shaped section online later stage.Ensure that gap preset precision is at ± 0.2mm, concrete demarcating steps is as follows:
1) fan-shaped section is carried out roller according to maintenance requirement and is arranged to arc, to medium work, ensures the normal and displacement transducer connection of hydraulic system correctly, displacement transducer signal and acquisition system communication state good etc., possess the condition of reaching the standard grade.
2) first select manual mode to be pressed on distance block by fan-shaped section, apply hand-held roll gap meter and measure four gap values between rollers in the assigned position of distance roller limit 100mm.
3) read the registration of current state lower four oil cylinder intrinsic displacement sensors, the roll gap actual measured value then corresponding position is made deviation and is calculated and determine offset.
4) turn automatic mode, set a rational gap values between rollers.After clamping cylinder automatically regulates and puts in place, apply hand-held roll gap meter and measure four gap values between rollers in the assigned position of distance roller limit 100mm; If the error of displacement transducer registration and roll gap meter measured value is within the scope of 0 ~ 0.1mm, demarcation completes; If exceed error range, then need to remodify offset, then repeat operation above, until roll gap is transferred in error range.
2, carry out the division of steel grade group according to carbon equivalent formula, strengthen the matching of steel grade and thermal physical property parameter, improve heat and follow the tracks of accuracy, avoid depressing greatly within the scope of the high solid fraction of 0.95 ~ 1.0.
[C％]eq＝[C％]+0.02*[Mn％]+0.04*[Ni％]-0.1*[Si％]-0.04*[Cr％]-0.1[Mo％]-0.7*[S％]
Mild steel: [C%] eq<0.08; Peritectic steel: 0.08< [C%] eq<0.15; Medium carbon steel: 0.15< [C%] eq<0.25; High-carbon steel: [C%] eq>0.25.
3, strictly control the degree of superheat, scope is 15 ~ 25 DEG C, and increase proportion of equiaxed grain, scope is 30 ~ 40%, avoids flourishing column crystal, and the thermoplasticity brought with the segregation reduced because of interdendritic solute element reduces.
4, adjust pulling rate and two cold techniques, avoid depressing in aligning district, section is 230mm*1200 ~ 1750mm, and pulling rate is 1.1 ~ 1.3m/min, and secondary cooling water specific water is 0.55 ~ 0.85L/kg.
5, optimize basic gap preset in casting blank solidification process: strand center be in liquid phase region, two-phase section and solid phase area time adopt suitable basic roll gap tapering according to solidification shrinkage rule, when center is in liquid phase region, basis roll gap range of taper is 0.15 ~ 0.25mm/m, when center is in mushy zone, basis roll gap range of taper is 0.10 ~ 0.35mm/m, and when center is in solid phase area, basis roll gap range of taper is 0.10 ~ 0.15mm/m.
6, optimize slighter compress amount, for the suitable overall reduction scope of 230mm heavy slab between 2.5 ~ 5.5mm, solidification end single fan-shaped section pressure amount is no more than 2.5mm.
7, optimize light pressure amount to distribute, to try one's best selection 2 ~ 3 sections pressure according to continuous casting process, between different fan-shaped section, large drafts difference is avoided in pressure distribution, and single fan-shaped section maximum depression rate controls at 1.0 ~ 1.2mm/m.
The invention has the advantages that: method advantages of simple, economical and efficient, utilize the present invention better can play the effect of light compression technology, near reduction strand trigonum while middle crack defect incidence, significantly improve center segregation level of control, improve the internal soundness of strand, strengthen the competitiveness of product.
Detailed description of the invention
Embodiment 1
Sem energy spectrum analysis is carried out to typical pipeline steel strand middle crack, has the element segregations such as obvious Nb, S in cracks, cause thermoplasticity to reduce.Under the stress of complexity, local maximum principal strain exceedes local critical strain, and then causes the generation of above-mentioned middle crack.Therefore, for reducing the ess-strain of solidification front near trigonum, the continuous casting process route of formulation is as shown in table 2 below, improve pulling rate to 1.2m/min, adopt high-carbon steel water meter to carry out strong cold control, adopt mild steel pressure pattern, casting machine pressure fan-shaped section is 8,9 two sections.Follow the tracks of fan-shaped section inner cylinder displacement transducer historical data within the scope of strand pressure range, two fan-shaped section drafts in pressure range evenly, reduction ratio is respectively 1.2mm/m, 0.7mm/m., eliminate middle crack near above-mentioned trigonum, respond well.
Table 2 continuous casting process route
| Steel grade | Pulling rate | Cooling system | Slighter compress pattern | Pressure fan-shaped section |
| Pipeline | 1.2m/min | By force cold (0.8L/kg) | Low-carbon (LC) (2.5mm) | 8、9 |
Embodiment 2
For ensureing the appointed condition of slighter compress technique, the off-line maintenance of being strict with fan-shaped section is demarcated and formerly detects, and ensures that gap preset precision is at ± 0.2mm.According to this casting machine press control principle, increase theoretical pressure range length to 4.5m, amendment solidus temperature to 1450 DEG C.Ensure that the accuracy of depressing position, and reduce the maximum depression rate in single fan-shaped section, casting machine basis roll gap curve is: central liquid phase region 0.39, center two-phase section 0.21, solidification zone, center 0.11; Casting machine pressure table curve is three sections of pressures, and reduction ratio is respectively 0.7mm/m, 1.0mm/m, 0.25mm/m.Follow the tracks of Inner Quality of Billet, center segregation, C class≤1.0 rank ratio increases substantially, and is increased to 87% from 45%.
Table 3 continuous casting process route
Claims (3)
1. pipe line steel sheet billet continuous casting typical case's middle crack and the control method of center segregation, is characterized in that, concrete steps and parameter as follows:
1) off-line calibration and on-line checkingi are carried out to casting machine roll gap, avoid the overgauge in fan-shaped section online later stage; Ensure that gap preset precision is at ± 0.2mm, concrete demarcating steps is as follows:
1. fan-shaped section carry out roller arrange to arc, centering work, possess the condition of reaching the standard grade;
2. first select manual mode to be pressed on distance block by fan-shaped section, measure four gap values between rollers with hand-held roll gap meter in the assigned position of distance roller limit 100mm;
3. read the registration of current state lower four oil cylinder intrinsic displacement sensors, the roll gap actual measured value then corresponding position is made deviation and is calculated and determine offset;
4. turn automatic mode, set a rational gap values between rollers; After clamping cylinder automatically regulates and puts in place, measure four gap values between rollers with hand-held roll gap meter in the assigned position of distance roller limit 100mm; The error of displacement transducer registration and roll gap meter measured value is within the scope of 0 ~ 0.1mm, and demarcation completes;
2) division of steel grade group is carried out according to formula:
[C％]eq＝[C％]+0.02*[Mn％]+0.04*[Ni％]-0.1*[Si％]-0.04*[Cr％]-0.1[Mo％]-0.7*[S％]
Mild steel: [C%] eq<0.08; Peritectic steel: 0.08< [C%] eq<0.15; Medium carbon steel: 0.15< [C%] eq<0.25;
High-carbon steel: [C%] eq>0.25;
3) control the degree of superheat, scope is 15 ~ 25 DEG C, and increase proportion of equiaxed grain, scope is 30 ~ 40%;
4) adjust pulling rate and two cold techniques, avoid depressing in aligning district, section is 230mm*1200 ~ 1750mm, and pulling rate is 1.1 ~ 1.3m/min, and secondary cooling water specific water is 0.55 ~ 0.85L/kg;
5) basic gap preset in casting blank solidification process: when strand center is in liquid phase region, basis roll gap range of taper is 0.15 ~ 0.25mm/m, when strand center is in mushy zone, basis roll gap range of taper is 0.10 ~ 0.35mm/m, and when strand center is in solid phase area, basis roll gap range of taper is 0.10 ~ 0.15mm/m;
6) for the overall reduction scope of 230mm heavy slab between 2.5 ~ 5.5mm, solidification end single fan-shaped section pressure amount is no more than 2.5mm;
7) continuous casting process is 2 ~ 3 sections of pressures, and single fan-shaped section maximum depression rate controls at 1.0 ~ 1.2mm/m.
2. method according to claim 1, is characterized in that, described step 1) after transfer automatic mode, when exceeding the error of displacement transducer registration and roll gap meter measured value, amendment offset, then repeat operation 4., until roll gap is transferred in error range.
3. method according to claim 1, it is characterized in that, described step 2) described in carry out steel grade group when dividing, strengthen the matching of steel grade and thermal physical property parameter, improve heat and follow the tracks of accuracy, avoid depressing greatly within the scope of the high solid fraction of 0.95 ~ 1.0.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106392029A (en) * | 2016-09-28 | 2017-02-15 | 南京钢铁股份有限公司 | Method for improving tissue property by cooling pipeline steel casting blank and heating pipeline steel casting blank at low temperature |
| CN107442756A (en) * | 2017-07-21 | 2017-12-08 | 首钢集团有限公司 | The method for improving slab slighter compress efficiency |
| CN107838390A (en) * | 2017-10-27 | 2018-03-27 | 舞阳钢铁有限责任公司 | A kind of method for improving big cross section peritectic steel continuous casting billet quality |
| CN108856668A (en) * | 2018-07-19 | 2018-11-23 | 首钢集团有限公司 | A kind of control method of continuous casting billet center segregation |
| CN109550915A (en) * | 2017-09-25 | 2019-04-02 | 上海梅山钢铁股份有限公司 | A method of control fine steel center segregation of continuous cast slab and loose |
| CN109759552A (en) * | 2019-03-11 | 2019-05-17 | 攀钢集团攀枝花钢钒有限公司 | Slab centre burst defect control method |
| CN111411189A (en) * | 2020-04-16 | 2020-07-14 | 南京钢铁股份有限公司 | Method for producing hydrogen-induced crack resistant steel grade by using ultra-wide thin-ratio slab continuous casting machine |
| CN113664174A (en) * | 2021-07-02 | 2021-11-19 | 包头钢铁（集团）有限责任公司 | Production method of steel S355NL commodity blank for wind power flange |
| CN114054707A (en) * | 2021-10-11 | 2022-02-18 | 包头钢铁（集团）有限责任公司 | Method for reducing center segregation of pipeline steel continuous casting billet |
| CN114669723A (en) * | 2022-03-21 | 2022-06-28 | 江阴兴澄特种钢铁有限公司 | Control method for effective reduction interval of casting blank |
| CN115430813A (en) * | 2022-08-31 | 2022-12-06 | 安阳钢铁股份有限公司 | Method for prolonging service life of crystallizer of ultra-wide thin slab continuous casting machine |
| CN117272761A (en) * | 2023-11-21 | 2023-12-22 | 北京科技大学 | Method and system for monitoring middle cracks of bloom |
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Cited By (18)
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| CN106392029A (en) * | 2016-09-28 | 2017-02-15 | 南京钢铁股份有限公司 | Method for improving tissue property by cooling pipeline steel casting blank and heating pipeline steel casting blank at low temperature |
| CN107442756B (en) * | 2017-07-21 | 2019-05-24 | 首钢集团有限公司 | The method for improving slab slighter compress efficiency |
| CN107442756A (en) * | 2017-07-21 | 2017-12-08 | 首钢集团有限公司 | The method for improving slab slighter compress efficiency |
| CN109550915B (en) * | 2017-09-25 | 2021-06-08 | 上海梅山钢铁股份有限公司 | Method for controlling center segregation and loosening of fine blanking steel continuous casting slab |
| CN109550915A (en) * | 2017-09-25 | 2019-04-02 | 上海梅山钢铁股份有限公司 | A method of control fine steel center segregation of continuous cast slab and loose |
| CN107838390A (en) * | 2017-10-27 | 2018-03-27 | 舞阳钢铁有限责任公司 | A kind of method for improving big cross section peritectic steel continuous casting billet quality |
| CN108856668B (en) * | 2018-07-19 | 2020-11-13 | 首钢集团有限公司 | Control method for continuous casting billet center segregation |
| CN108856668A (en) * | 2018-07-19 | 2018-11-23 | 首钢集团有限公司 | A kind of control method of continuous casting billet center segregation |
| CN109759552A (en) * | 2019-03-11 | 2019-05-17 | 攀钢集团攀枝花钢钒有限公司 | Slab centre burst defect control method |
| CN111411189A (en) * | 2020-04-16 | 2020-07-14 | 南京钢铁股份有限公司 | Method for producing hydrogen-induced crack resistant steel grade by using ultra-wide thin-ratio slab continuous casting machine |
| CN113664174A (en) * | 2021-07-02 | 2021-11-19 | 包头钢铁（集团）有限责任公司 | Production method of steel S355NL commodity blank for wind power flange |
| CN114054707A (en) * | 2021-10-11 | 2022-02-18 | 包头钢铁（集团）有限责任公司 | Method for reducing center segregation of pipeline steel continuous casting billet |
| CN114669723A (en) * | 2022-03-21 | 2022-06-28 | 江阴兴澄特种钢铁有限公司 | Control method for effective reduction interval of casting blank |
| CN114669723B (en) * | 2022-03-21 | 2024-05-17 | 江阴兴澄特种钢铁有限公司 | Control method for effective rolling interval of casting blank |
| CN115430813A (en) * | 2022-08-31 | 2022-12-06 | 安阳钢铁股份有限公司 | Method for prolonging service life of crystallizer of ultra-wide thin slab continuous casting machine |
| CN115430813B (en) * | 2022-08-31 | 2024-02-13 | 安阳钢铁股份有限公司 | Method for prolonging service life of crystallizer of ultra-wide sheet billet continuous casting machine |
| CN117272761A (en) * | 2023-11-21 | 2023-12-22 | 北京科技大学 | Method and system for monitoring middle cracks of bloom |
| CN117272761B (en) * | 2023-11-21 | 2024-04-26 | 北京科技大学 | Method and system for monitoring middle cracks of bloom |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |
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