CN107081412A - The preparation method of high-quality plastic die steel special heavy plate continuous casting mother's base - Google Patents
The preparation method of high-quality plastic die steel special heavy plate continuous casting mother's base Download PDFInfo
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- CN107081412A CN107081412A CN201710213411.2A CN201710213411A CN107081412A CN 107081412 A CN107081412 A CN 107081412A CN 201710213411 A CN201710213411 A CN 201710213411A CN 107081412 A CN107081412 A CN 107081412A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 43
- 239000010959 steel Substances 0.000 title claims abstract description 43
- 238000009749 continuous casting Methods 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000007787 solid Substances 0.000 claims abstract description 17
- 238000005516 engineering process Methods 0.000 claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 14
- 238000007711 solidification Methods 0.000 claims abstract description 14
- 230000008023 solidification Effects 0.000 claims abstract description 14
- 238000009826 distribution Methods 0.000 claims abstract description 10
- 239000013585 weight reducing agent Substances 0.000 claims abstract description 8
- 230000000994 depressogenic effect Effects 0.000 claims abstract description 3
- 230000009467 reduction Effects 0.000 claims description 15
- 238000000034 method Methods 0.000 abstract description 10
- 238000001514 detection method Methods 0.000 abstract description 9
- 238000005204 segregation Methods 0.000 abstract description 9
- 230000006835 compression Effects 0.000 abstract description 8
- 238000007906 compression Methods 0.000 abstract description 8
- 230000007547 defect Effects 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000012797 qualification Methods 0.000 abstract description 3
- 238000007689 inspection Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 206010019027 Haemothorax Diseases 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 208000028831 congenital heart disease Diseases 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
Classifications
-
- 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a kind of preparation method of the female base of high-quality plastic die steel special heavy plate continuous casting, in the casting process, control casting speed for 0.80m/min~0.90m/min；Using under solidification end weight；Using slighter compress with being depressed under weight by solid rate distribution drafts.Using solidification end, dynamically weight Reduction Technology improves Inner Quality of Billet to this method, the center segregation and center porosity defect of strand is improved；Producing 120 mm, (compression ratio is only 2.12:1) under the target of specification special heavy plate, the internal soundness of the effective flaw detection slab for improving low compression ratio, and the flaw detection qualification rate that production process mesolow contracts than slab of detecting a flaw is controlled more than 99%.Using the industrial strand of this method, worked well after implementation, can efficiently meet the use requirement of mould steel.
Description
Technical field
The present invention relates to a kind of continuous cast method, the preparation of especially a kind of female base of high-quality plastic die steel special heavy plate continuous casting
Method.
Background technology
Plastic die steel, it has high intensity, hardness, wearability and enough toughness, be mainly used in cold rolling, hot rolling and
Steel for Plastic Die, for forging, punching press, cut type and die casting etc..Because the condition of work of this kind of steel grade is complicated, therefore to mould
It is higher with the performance requirement of steel, it especially must assure that the central dense degree and center porosity defect of strand and special heavy plate are changed
It is kind, otherwise just it is difficult to ensure that the safe mass problem of plastic die steel special heavy plate.Therefore, eliminate strand center porosity and center is inclined
To continuous casting, such steel grade is significant for analysis.
Patent application CN201210406734.0 " a kind of preparation technology of mould steel ", the invention discloses a kind of mould steel
Preparation technology, include following steps：Each composition is matched somebody with somebody by its weight in a, casting mold steel blank step, mould steel blank
Than：3Cr2Mo is that 0.4%-0.6%, Y20CrNi3AIMnMo (SM2) are that 0.7%-0.9%, Y55CrNiMnMoV (SM1) are
3.0%-4.0%, 5NiSCa are that 2.0-2.5%, 4Cr5MoVS are 4.0%-5.0% and C is 0.2%-0.25%, and remaining is
Fe, the mould steel slab temperature of moulding by casting is down to 250 DEG C, is again heated to 650-760 DEG C, is incubated 5-6 hours, is furnace-cooled to 280-
320 DEG C, 3-5 hours are incubated, 650-690 DEG C is again heated to, 32 hours is incubated, 400 DEG C is cooled to 40 DEG C/h, then with 18
DEG C/h, it is cooled to 120 DEG C；The new die steel that the present invention is announced, makes mould steel have significant hardness and toughness, improves
Metallurgical quality and quenching degree, makes the overall performance of steel be significantly improved；But the production used time of this method is longer, is produced into
This height, it is extremely inefficient, be not suitable for large-scale industrial production.
Patent application CN201310619403.X " a kind of control and the work for improving mould steel continuous casting heavy slab internal soundness
Skill ", the present invention relates to it is a kind of control and improve mould steel continuous casting heavy slab internal soundness technique, by conticaster vertical section,
The control of bending section and straightening section water, the vertical section water-carrying capacity control is in 12~19m3/h；In bending section inner arc water-carrying capacity
Control is in 18~26m3/ h, outer arc water-carrying capacity is controlled in 20~28m3/h；In straightening section inner arc water rate control in 4~7m3/ h, outside
Arc water rate control is in 6~10m3/h.The present invention reduces slab cooling mistake by controlling outer arc water-carrying capacity in vertical section and bending section
Rising again for journey, is reduced or eliminated due to the crackle that thermal stress is produced；Control outer arc water-carrying capacity in straightening section, the interval casting of control aligning
900~1100 DEG C of base temperature, is reduced or eliminated because straightening force is cracked；Near Coagulated hemothorax, implement a fan-shaped section
Pressure, can make depressing force be delivered to strand center, control and improvement heavy slab center segregation, center porosity and shrinkage cavity；But
Effectively control center segregation of casting blank is not described on soft reduction process during pressure.
Patent application CN201110437337.5 " a kind of production method of low compression ratio crack detection thick plate ", it applies RH vacuum
Degassing process effectively controls hydrogen content in steel, and Inner Quality of Billet is improved using dynamic soft-reduction；Utilize rough rolling step low speed
Big pressure makes roll-force penetrate into steel plate center portion to be effectively improved steel plate heart defect, pass through to the above flaw detection slab stacking slow cooling
The key process parameter control of process solves the underproof problem of low compression ratio slab flaw detection.Advantage is, effective to improve
The internal soundness of the flaw detection slab of low compression ratio, and the flaw detection qualification rate control that production process mesolow contracts than slab of detecting a flaw is existed
More than 98%；But the loose problem to strand center mass improves limited.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of preparation of the female base of high-quality plastic die steel special heavy plate continuous casting
Method, to provide its internal soundness.
In order to solve the above technical problems, the technical solution used in the present invention is：In casting process, the casting speed is controlled to be
0.80m/min~0.90m/min；Using solidification end weight Reduction Technology, pressure mode is using slighter compress with pressing solid phase under weight
Rate distribution drafts is depressed.
Solidification end weight Reduction Technology of the present invention：Soft reduction rate is 0.03mm/s, and pulling rate is 0.80m/min during pressure
~0.90m/min, pressure range length is 6.0m~10.0m, and single roller maximum reduction is 15mm.
In the distribution drafts of the present invention by solid rate, weight pressure part when fs=0.95 depress, drafts is
26mm。
It is using the beneficial effect produced by above-mentioned technical proposal：The present invention mainly by stabilizing continuous casting machine pulling rate,
The integrated use of the technical measures such as technical controlling reduces the center porosity of plastic die steel strand, Jin Erti under solidification end weight
The defect such as high center segregation of casting blank and center porosity, condition is provided for production low compression ratio special heavy plate.
Of the invention using solidification end, dynamically weight Reduction Technology improves Inner Quality of Billet, makes the center segregation of strand with
Heart rarefaction defect is improved；Producing 120 mm, (compression ratio is only 2.12:1) under the target of specification special heavy plate, effectively change
The internal soundness of the flaw detection slab of kind low compression ratio, and production process mesolow is contracted than the flaw detection qualification rate control for slab of detecting a flaw
More than 99%.Using industrial strand of the invention, worked well after implementation, can efficiently meet making for plastic die steel
With requiring.
Embodiment
With reference to specific embodiment, the present invention is further detailed explanation.
The preparation method of this high-quality plastic die steel special heavy plate continuous casting mother's base is as described below：（1）In casting process, control
Casting speed is between 0.80m/min~0.90m/min.
（2）Using solidification end weight Reduction Technology, Soft reduction rate is 0.03mm/s, and Casting speed is 0.80m/ during pressure
Min~0.90m/min, pressure range length is 6.0m~10.0m, and lower roll position is constant during pressure, what single upper roller was pressed downward
Maximum reduction is 15mm.
（3）The solidification end weight Reduction Technology is using slighter compress with being pressed under weight by solid rate distribution drafts
Under, weight pressure part after fs=0.95 depress, the overall reduction of weight pressure part is 15mm~26mm；Slighter compress pressure
Lower amount is no more than 10mm.
Embodiment 1：The concrete technology of the preparation method of this high-quality plastic die steel special heavy plate continuous casting mother's base is as described below.
Continuous casting cross dimension is 1800mm × 254mm P20 mould steel, and conticaster pulling rate is 0.88m/min, and
Pulling rate is kept to stablize constant, the Metal in Tundish degree of superheat is 20 DEG C；Employ technical controlling under solidification end weight, Soft reduction rate
For 0.03mm/s, pressure range length is 10m, overall reduction 35mm.Wherein the solid rate scope of slighter compress part 0.5~
Between 0.98, the solid rate scope of weight pressure part is between 0.98~1.It is 0.93~1 in the 10th fan-shaped section solid rate, belongs to
Slighter compress is superimposed area with weight, so the distribution of drafts is 0.08mm in 8 sections of slighter compress, 9 sections of slighter compress are 2.69mm,
10 sections of slighter compress be under 6.23mm, weight be under 6.46mm, 11 sections of weight under 10.4mm, 12 sections of weight be 9.10mm, 13 sections
It is 0.04mm under weight.
After being poured, macroscopic examination is carried out to P20 mould steel Inner Quality of Billet, inspection result shows, strand is horizontal
Low power non-stop layer shrinkage porosite ratio brings up to 100% by 51%, and center porosity defect is rated I grade of ratio and brings up to 100% by 60%, in
The ratio of heart segregation≤0.5 grade brings up to 100% by 60%.
Embodiment 2：The concrete technology of the preparation method of this high-quality plastic die steel special heavy plate continuous casting mother's base is as described below.
Continuous casting cross dimension is 1800mm × 260mm P20 mould steel, and conticaster pulling rate is 0.83m/min, and
Pulling rate is kept to stablize constant, the Metal in Tundish degree of superheat is 20 DEG C；Employ technical controlling under solidification end weight, Soft reduction rate
For 0.03mm/s, pressure range length is 9m, overall reduction 29mm.Wherein the solid rate scope of slighter compress part 0.6~
Between 0.95, the solid rate scope of weight pressure part is between 0.95~1；It is 0.94~1 in the 10th fan-shaped section solid rate, belongs to
Slighter compress is superimposed area with weight, so the distribution of drafts is 1.79mm in 8 sections of slighter compress, 9 sections of slighter compress are 3.21mm,
10 sections of slighter compress be under 4.0mm, weight be under 5.1mm, 11 sections of weight under 9.5mm, 12 sections of weight be 5.4mm, 13 sections of weight
It is 0mm down.
After being poured, macroscopic examination is carried out to P20 mould steel Inner Quality of Billet, inspection result shows, strand is horizontal
Low power non-stop layer shrinkage porosite ratio brings up to 100% by 54%, and center porosity defect is rated I grade of ratio and brings up to 100% by 60%, in
The ratio of heart segregation≤0.5 grade brings up to 99% by 60%.
Embodiment 3：The concrete technology of the preparation method of this high-quality plastic die steel special heavy plate continuous casting mother's base is as described below.
Continuous casting cross dimension is 1800mm × 260mm P20 mould steel, and conticaster pulling rate is 0.85m/min, and
Pulling rate is kept to stablize constant, the Metal in Tundish degree of superheat is 30 DEG C；Employ technical controlling under solidification end weight, Soft reduction rate
For 0.03mm/s, pressure range length is 8m, overall reduction 27mm.Wherein the solid rate scope of slighter compress part 0.6~
Between 0.94, the solid rate scope of weight pressure part is between 0.95~1；It is 0.92~1 in the 10th fan-shaped section solid rate, belongs to
Slighter compress is superimposed area with weight, so the distribution of drafts is 2.51mm in 8 sections of slighter compress, 9 sections of slighter compress are 2.73mm,
10 sections of slighter compress be under 3.76mm, 10 sections of weight be under 4.25mm, 11 sections of weight under 9.26mm, 12 sections of weight be 4.06mm,
It is 0.43mm under 13 sections of weight.
After being poured, macroscopic examination is carried out to P20 mould steel Inner Quality of Billet, inspection result shows, strand is horizontal
Low power non-stop layer shrinkage porosite ratio brings up to 100% by 58%, and center porosity defect is rated I grade of ratio and brings up to 100% by 59%, in
The ratio of heart segregation≤0.5 grade brings up to 99% by 60%.
Embodiment 4：The concrete technology of the preparation method of this high-quality plastic die steel special heavy plate continuous casting mother's base is as described below.
Continuous casting cross dimension is 1800mm × 254mm P20 mould steel, and conticaster pulling rate is 0.90m/min, and
Pulling rate is kept to stablize constant, the Metal in Tundish degree of superheat is 25 DEG C；Employ technical controlling under solidification end weight, Soft reduction rate
For 0.03mm/s, pressure range length is 6m, overall reduction 26mm.Wherein the solid rate scope of slighter compress part 0.6~
Between 0.94, the solid rate scope of weight pressure part is between 0.95~1；It is 0.92~1 in the 10th fan-shaped section solid rate, belongs to
Slighter compress is superimposed area with weight；So the distribution of drafts is 0.86mm in 8 sections of slighter compress, 9 sections of slighter compress are 4.04mm,
10 sections of slighter compress be under 4.1mm, 10 sections of weight be under 3.11mm, 11 sections of weight under 7.89mm, 12 sections of weight be 4.68mm, 13
It is 1.32mm under section weight.
After being poured, macroscopic examination is carried out to P20 mould steel Inner Quality of Billet, inspection result shows, strand is horizontal
Low power non-stop layer shrinkage porosite ratio brings up to 100% by 53%, and center porosity defect is rated I grade of ratio and brings up to 100% by 59%, in
The ratio of heart segregation≤0.5 grade brings up to 99% by 62%.
Claims (3)
1. a kind of preparation method of the female base of high-quality plastic die steel special heavy plate continuous casting, it is characterised in that：In casting process, control
Casting speed is 0.80m/min~0.90m/min；Using solidification end weight Reduction Technology, pressure mode is using slighter compress and again
Pressure is depressed by solid rate distribution drafts.
2. the preparation method of the female base of high-quality plastic die steel special heavy plate continuous casting according to claim 1, it is characterised in that
The solidification end weight Reduction Technology：Soft reduction rate is 0.03mm/s, and pulling rate is 0.80m/min~0.90m/min, pressure during pressure
Lower siding-to-siding block length is 6.0m~10.0m, and single roller maximum reduction is 15mm.
3. the preparation method of the female base of high-quality plastic die steel special heavy plate continuous casting according to claim 1 or 2, its feature exists
In：In the distribution drafts by solid rate, weight pressure part when fs=0.95 depress, drafts is 26mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710213411.2A CN107081412B (en) | 2017-04-01 | 2017-04-01 | The preparation method of high-quality plastic die steel special heavy plate continuous casting mother's base |
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| CN201710213411.2A CN107081412B (en) | 2017-04-01 | 2017-04-01 | The preparation method of high-quality plastic die steel special heavy plate continuous casting mother's base |
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| CN107081412A true CN107081412A (en) | 2017-08-22 |
| CN107081412B CN107081412B (en) | 2019-08-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114682746A (en) * | 2022-04-07 | 2022-07-01 | 首钢京唐钢铁联合有限责任公司 | Production method of super-thick steel plate |
| CN114871400A (en) * | 2022-06-13 | 2022-08-09 | 中天钢铁集团有限公司 | Continuous casting solidification process determination method based on single-roller pressing operation and application thereof |
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| CN114871400A (en) * | 2022-06-13 | 2022-08-09 | 中天钢铁集团有限公司 | Continuous casting solidification process determination method based on single-roller pressing operation and application thereof |
| CN114871400B (en) * | 2022-06-13 | 2024-02-27 | 中天钢铁集团有限公司 | Continuous casting solidification process judging method based on single-roll pressing operation and application thereof |
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| CN107081412B (en) | 2019-08-09 |
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