CN107641683A - A kind of method of continuous casting and rolling quenching technological design - Google Patents
A kind of method of continuous casting and rolling quenching technological design Download PDFInfo
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- CN107641683A CN107641683A CN201710723206.0A CN201710723206A CN107641683A CN 107641683 A CN107641683 A CN 107641683A CN 201710723206 A CN201710723206 A CN 201710723206A CN 107641683 A CN107641683 A CN 107641683A
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Abstract
The present invention provides a kind of method of continuous casting and rolling quenching technological design, it is characterised in that methods described includes：(1) whole continuous casting is drawn to the temperature variation curve of casting billet surface and its certain depth strand during hot sending；(2) the overcooling austenite isothermal transformation TTT curves of steel grade are drawn in same figure；(3) flow characteristics position is added in same figure；(4) according to temperature variation curve in figure and the position of intersecting point of TTT curves, austenite grain boundary embrittlement starting position is determined；(5) according to the austenite grain boundary embrittlement starting position determined in step (4), it is determined that performing the position of quenching technique.The forming position of strand scale surface crystal boundary banded structure, according to steel grade, and continuous casting and hot sending rhythm is produced, can be determined, so that it is determined that quenching position and quenching capacity of equipment in the design phase by this method；In actual production, according to production steel grade and continuous casting and hot sending rhythm, quenching technique is determined.
Description
Technical field
The present invention relates to continuously casting and continuously rolling technology field, and in particular to a kind of method of continuous casting and rolling quenching technological design.
Background technology
The hot-loading and hot-conveying or Direct Rolling of continuous casting billet can substantially reduce production cost.With steel market competition increasingly
Fierceness, in further production cost behave is reduced, continuous casting billet hot-loading and hot-conveying even direct rolling process obviously can reduce energy
Source consumes, while reduces time in heating furnace etc., turns into the only effective cost control measure.
But for the crack-sensitivity steel grade of micro alloyed steel, carbon content 0.4~0.55, under current hot sending state of arts,
The precipitates such as the nitride such as aluminium nitride, boron nitride and carbonitride can be separated out on casting billet surface crystal boundary, in crystal boundary under serious conditions
Upper formation banded structure, reduce casting billet surface tissue plasticity, cause crack-sensitivity, the later stage in heating or the operation of rolling,
There is face crack, and cause whole material off quality.So crack-sensitivity steel grade hot-loading and hot-conveying ratio such as current micro alloyed steel
It is all very low, less than 20%, it can not more realize Direct Rolling.
The production of the crack-sensitivity steel grade such as micro alloyed steel is general all even cheated using slow cooling it is cold by the way of, so produce all
The factors such as phase, thermal loss, heat time length cause production cost higher.
At present, surface hardening technology is used to solve casting billet surface during hot-loading and hot-conveying from mechanism after continuous casting cutting
Crackle occurs, and has also had relevant device.But due to failing solve quenching technological design thinking, such as some steel grade, quench
How cold position, During Quenching temperature etc. design, and cause quenching capacity utilization low, or even do not use and discard, not
Play and improve micro alloyed steel hot sending ratio.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, it is an object of the invention to provide a kind of continuous casting and rolling quenching technique to set
The method of meter, according to production steel grade, and continuous casting and hot sending rhythm, it can determine that strand is determined in the design phase by this method
The forming position of chi surface crystal boundary banded structure, so that it is determined that quenching position and quenching capacity of equipment；In actual production, according to
Steel grade and continuous casting and hot sending rhythm are produced, determines quenching technique.
In order to achieve the above object, the technical solution adopted in the present invention is：A kind of continuous casting and rolling quenching technological design
Method, it is characterised in that methods described includes：
(1) whole continuous casting is drawn to the temperature variation curve of casting billet surface and its certain depth strand during hot sending；
(2) the overcooling austenite isothermal transformation TTT curves of steel grade are drawn in same figure；
(3) flow characteristics position is added in same figure；
(4) according to temperature variation curve in figure and the position of intersecting point of TTT curves, austenite grain boundary embrittlement start bit is determined
Put；
(5) according to the austenite grain boundary embrittlement starting position determined in step (4), it is determined that performing the position of quenching technique.
Further, in step (1), the temperature variation curve data of casting billet surface and its certain depth strand use
Models for temperature field is calculated.
Further, in step (2), the overcooling austenite isothermal transformation TTT curves of the steel grade include：Ferrite starts
Formation curve, pearlite start formation curve, pearlite terminates formation curve, bainite starts formation curve.
Further, in step (4), the position of intersecting point is to intersect first with temperature variation curve in TTT curves
The particular location of embrittlement takes place in position of intersecting point, as austenite grain boundary, especially pays close attention to ferrite and starts formation curve.
Further,, need to be in same figure if the steel grade has TTP curves according to steel grade species in step (2)
Temperature-time-performance TTP curves that steel grade nitride and carbonitride separate out in crystal boundary are drawn in increase, are become according to temperature in figure
Changing the position of intersecting point of curve and TTP curves can determine that crystal boundary separates out nitride or/and carbonitride and causes embrittlement of grain boundaries
Particular location.
Further, temperature variation curve and TTT intersections of complex curve position are brittle starting position, temperature variation curve and crystalline substance
Boundary TTP intersections of complex curve position is also brittle starting position, meanwhile, temperature variation curve and TTT curves and TTP curves have friendship
Point, then more resolved intersection point behind in two intersection points is brittle starting position, i.e., has not only separated out ferrite in crystal boundary,
Also nitride or carbonitride have been separated out.
Further, the casting billet surface and its certain depth, the certain depth refer to casting billet surface within 20mm.
Further, in step (1), the temperature variation curve of casting billet surface and its certain depth strand includes：It is wide
Identity distance from the temperature variation curve of surface certain depth strand with a distance from the temperature variation curve of surface certain depth strand, corner,
Temperature variation curve of the leptoprosopy apart from surface certain depth strand.
Further, in step (3), the flow characteristics position includes：Continuous casting drawing sedan-chair seat in the plane is put, fire cuts end position,
Turn over cooling bed position, the ejection roller way for being heat-fed process and rollgang position, heating furnace position, bloom roll position, stay-warm case position
Put, heater position.
Further, in step (5), the method for determining to perform the position of quenching technique includes：
According to brittle starting position, near brittle starting position, primarily determine that what is allowed in an equipment in arrangement holds
The position of row quenching technique；
Obtain the distance between brittle starting position and the position of execution quenching technique primarily determined that poor Δ X, wherein X
The position of X-axis coordinate in corresponding temperature change curve；
Judge whether Δ X meets | Δ X |≤| Δ Xcri |, wherein Δ Xcri be brittle starting position before and after quenching effectively and
The critical length of quenching crackle will not be caused；
If satisfied, the position for determining the execution quenching technique primarily determined that is the position for determining to perform quenching technique；
If not satisfied, then redefine the position of an execution quenching technique；Untill above-mentioned condition is met.
Compared with prior art, the beneficial effects of the invention are as follows：Although quenching equipment and technique have had application, simultaneously
Do not have the systematic document for providing quenching technology establishment method.The method provided by the present invention, can accurately find crystal boundary
Position caused by banded structure, more accurate equipment position on the one hand can be provided in the design phase, on the other hand in life
In production, with reference to follow-up hot sending process, it can provide whether production steel grade needs quenching technique；With which kind of continuous casting and hot sending process
The generation of crystal boundary banded structure can be avoided so as to avoid face crack without quenching technique；If necessary to quenching work
Skill, continuous casting and hot sending rhythm of production suggestion are provided, it is just met for quenching device location；Or according to rhythm of production, formulate
Targetedly quenching technique etc..
Brief description of the drawings
Fig. 1 is the metallographic structure near No. 45 steel casting billet surfaces.
Fig. 2 is characterized the temperature trend of temperature spot.
Fig. 3 is quenching technology establishment artwork.
Fig. 4 is the schematic diagram for needing quenching technique.
Fig. 5 is the schematic diagram for not needing quenching technique.
Embodiment
For the ease of those of ordinary skill in the art understand and implement the present invention, the present invention is made with reference to embodiment into
The detailed description of one step, it will be appreciated that implementation example described herein is merely to illustrate and explain the present invention, and is not used to limit
The fixed present invention.
The present invention provides a kind of method of continuous casting and rolling quenching technological design, and methods described includes：
(1) whole continuous casting is drawn to the temperature variation curve of casting billet surface and its certain depth strand during hot sending；
(2) the overcooling austenite isothermal transformation TTT curves of steel grade are drawn in same figure；
(3) flow characteristics position is added in same figure；
(4) according to temperature variation curve in figure and the position of intersecting point of TTT curves, austenite grain boundary embrittlement start bit is determined
Put；
(5) according to the austenite grain boundary embrittlement starting position determined in step (4), it is determined that performing the position of quenching technique.
Wherein, in step (1), the temperature variation curve data of casting billet surface and its certain depth strand use temperature
Field model is calculated.
Wherein, in step (2), the overcooling austenite isothermal transformation TTT curves of the steel grade include：Ferrite starts to generate
Curve, pearlite start formation curve, pearlite terminates formation curve, bainite starts formation curve.
Wherein, in step (4), the position of intersecting point is the intersection point intersected first with temperature variation curve in TTT curves
The particular location of embrittlement takes place in position, as austenite grain boundary, especially pays close attention to ferrite and starts formation curve.
Wherein, in step (2), according to steel grade species, if the steel grade there are TTP curves, need to increase in same figure
Temperature-time-performance TTP curves that steel grade nitride and carbonitride separate out in crystal boundary are drawn, it is bent according to temperature change in figure
The position of intersecting point of line and TTP curves can determine that crystal boundary separates out nitride or/and carbonitride and causes the specific of embrittlement of grain boundaries
Position.
Wherein, temperature variation curve and TTT intersections of complex curve position are brittle starting position, temperature variation curve and crystal boundary
TTP intersections of complex curve position is also brittle starting position, meanwhile, temperature variation curve and TTT curves and TTP curves have friendship
Point, then more resolved intersection point behind in two intersection points is brittle starting position, i.e., has not only separated out ferrite in crystal boundary,
Also nitride or carbonitride have been separated out.
Wherein, the casting billet surface and its certain depth, the certain depth refer to casting billet surface within 20mm.
Wherein, in step (1), the temperature variation curve of casting billet surface and its certain depth strand includes：Wide identity distance
Temperature variation curve, the leptoprosopy of surface certain depth strand with a distance from temperature variation curve, corner from surface certain depth strand
Apart from the temperature variation curve of surface certain depth strand.
Wherein, in step (3), the flow characteristics position includes：Continuous casting drawing sedan-chair seat in the plane is put, fire cuts end position, upset
Cold bed position, be heat-fed process ejection roller way and rollgang position, heating furnace position, bloom roll position, stay-warm case position, plus
Hot charging seated position.The flow characteristics position be by the specific position information in flow, according to pulling rate and follow-up rhythm of production,
The moment is converted to, so as to draw on a timeline.
Wherein, in step (5), the method for determining to perform the position of quenching technique includes：
According to brittle starting position, near brittle starting position, primarily determine that what is allowed in an equipment in arrangement holds
The position of row quenching technique；
Obtain the distance between brittle starting position and the position of execution quenching technique primarily determined that poor Δ X, wherein X
The position of X-axis coordinate in corresponding temperature change curve；
Judge whether Δ X meets | Δ X |≤| Δ Xcri |, wherein Δ Xcri be brittle starting position before and after quenching effectively and
The critical length of quenching crackle will not be caused；
If satisfied, the position for determining the execution quenching technique primarily determined that is the position for determining to perform quenching technique；
If not satisfied, then redefine the position of an execution quenching technique；Untill above-mentioned condition is met.
The position of the execution quenching technique allowed in equipment in arrangement, refer to needs consider brittle beginning particular location,
The conditions such as whether equipment is realized, allow in flow, so needing to set the quenching position in arrangement allowed in an equipment.
The inventive method is described in detail with reference to specific embodiment.
Fig. 1 is the metallographic structure near No. 45 steel surfaces of certain steel mill's actual production, there it can be seen that austenite crystal
Size is very big, and the banded structure for having light tone more than 200 μm, on crystal boundary generates, and this banded structure can cause strand in stress
During (thermal stress or mechanical stress), cracked in crystal boundary, here it is hot sending process face crack caused by mechanism.
Main manufacturing parameter is corresponding to Fig. 1：Section 180*220mm, pulling rate 1.5m/min, the degree of superheat are 30 DEG C, and two is cold
Specific water is 0.3L/kg.Device parameter is：Crystallizer effective depth 0.72m, two cold overall length 6.5m.Steel grade parameter is：C
0.45、Si 0.27、Mn 0.65、S 0.02、P 0.02、Cr 0.2、Ni 0.2。
Device parameter, steel grade parameter and manufacturing parameter according to corresponding to Fig. 1, the change of temperature field of strand is calculated, including
20min hot sendings process after the cutting of casting process and prediction, Fig. 2 is Calculated Results of Temperature Field, and curve therein is apart from surface
Temperature changing trend at subcutaneous 3mm, it can be seen that wide face and leptoprosopy characteristic temperature are essentially identical, and corner temperature is relatively low, this
It is more conform with actual conditions.
In order to come to understand the variation tendency of temperature near casting billet surface, using the method for patent of the present invention, Fig. 2 is calculated and tied
Fruit, and characterization device information are drawn into Supercooled Austenite Isothermal Transformation Diagram (TTT curves) figure of No. 45 steel grades, as a result see Fig. 3.
Because No. 45 steel grades in temperature drop process do not have Carbonitride Precipitation, so only with TTT curves are concerned about, if the steel calculated
Kind has Carbonitride Precipitation, then also needs to be concerned about nitride and carbonitride Temperature-time-performance curve (TTP) curve.Fig. 3
In be also drawn into fire and cut end position, be continuous casting production process before fire cuts end.
As can be seen from Figure 3：Apart from surface 3mm wide face and leptoprosopy characteristic temperature whole casting process always situated in
The top of austenite decomposition, ferrite formation curve, i.e. casting billet surface have been at austenite process, in whole casting process
Austenite is constantly being grown up, and here it is why austenite crystal is bigger in Fig. 1 metallographic structures.And entirely connecting
During casting, ferrite is not generated, is not had ferrite generation on austenite grain boundary, is less had banded structure in Fig. 1
Generation.
As can be seen from Figure 3：After fire cuts end, characteristic temperature progresses into ferrite and starts to generate temperature curve
Within, start to form ferrite in crystal boundary, i.e. the banded structure that grain boundary ferrite is formed in Fig. 1 be fire cut after terminating from
Turn over cooling bed is to producing during stacking.
According to Fig. 3, after fire cuts end, ferrite is begun with after about 8min and is separated out in crystal boundary, if follow-up hot sending is entered
Degree can be controlled within 8min, then can not have to consider that banded structure produces and causes face crack, without examining
Consider surface quenching technology, if as shown in figure 5, subsequently hot sending hot-rolled process efficiency is very high, 6 minutes or so just after dicing for strand
Heating furnace is entered, now austenite grain boundary does not also have ferrite to be formed, and will not cause embrittlement of grain boundaries；If hot sending progress is more than
8min, then casting billet surface may crack in Furnace Production Process, as shown in Figure 4, it is necessary to using quenching technology
To be remolded to the tissue of casting billet surface, so as to eliminate the banded structure formed in crystal boundary.And by Fig. 3, it is also known that
Ferrite starts caused position, this emphasis position selection information that namely quenching technology in surface is implemented.
It should be appreciated that the part that this specification does not elaborate belongs to prior art.
It should be appreciated that the above-mentioned description for preferred embodiment is more detailed, therefore can not be considered to this
The limitation of invention patent protection scope, one of ordinary skill in the art are not departing from power of the present invention under the enlightenment of the present invention
Profit is required under protected ambit, can also be made replacement or deformation, be each fallen within protection scope of the present invention, this hair
It is bright scope is claimed to be determined by the appended claims.
Claims (10)
- A kind of 1. method of continuous casting and rolling quenching technological design, it is characterised in that methods described includes：(1) whole continuous casting is drawn to the temperature variation curve of casting billet surface and its certain depth strand during hot sending；(2) the overcooling austenite isothermal transformation TTT curves of steel grade are drawn in same figure；(3) flow characteristics position is added in same figure；(4) according to temperature variation curve in figure and the position of intersecting point of TTT curves, austenite grain boundary embrittlement starting position is determined；(5) according to the austenite grain boundary embrittlement starting position determined in step (4), it is determined that performing the position of quenching technique.
- 2. the method for continuous casting and rolling quenching technological design according to claim 1, it is characterised in that described in step (1) The temperature variation curve data of casting billet surface and its certain depth strand are calculated using models for temperature field.
- 3. the method for continuous casting and rolling quenching technological design according to claim 1, it is characterised in that described in step (2) The overcooling austenite isothermal transformation TTT curves of steel grade include：Ferrite starts formation curve, pearlite starts formation curve, pearl Body of light terminates formation curve, bainite starts formation curve.
- 4. the method for continuous casting and rolling quenching technological design according to claim 3, it is characterised in that described in step (4) Position of intersecting point is the position of intersecting point intersected first with temperature variation curve in TTT curves, and as austenite grain boundary takes place Brittle particular location, especially pay close attention to ferrite and start formation curve.
- 5. the method for continuous casting and rolling quenching technological design according to claim 1, it is characterised in that in step (2), according to Steel grade species, if the steel grade has TTP curves, it need to increase in same figure and draw steel grade nitride and carbonitride in crystalline substance Temperature-time-performance TTP curves that boundary separates out, can be determined according to the position of intersecting point of temperature variation curve in figure and TTP curves Crystal boundary separates out nitride or/and carbonitride and causes the particular location of embrittlement of grain boundaries.
- 6. the method for the continuous casting and rolling quenching technological design according to any one of claim 3~5, it is characterised in that temperature Change curve and TTT intersections of complex curve position are that brittle starting position, temperature variation curve and crystal boundary TTP intersections of complex curve position are also Brittle starting position, meanwhile, temperature variation curve and TTT curves and TTP curves have intersection point, then behind in two intersection points Intersection point it is more resolved be brittle starting position, i.e., not only separated out ferrite in crystal boundary, also separated out nitride or carbon Nitride.
- 7. the method for the continuous casting and rolling quenching technological design according to any one of claim 1~6, it is characterised in that described Casting billet surface and its certain depth, the certain depth refer to casting billet surface within 20mm.
- 8. the method for the continuous casting and rolling quenching technological design according to any one of claim 1~6, it is characterised in that step (1) in, the temperature variation curve of casting billet surface and its certain depth strand includes：Wide identity distance is from surface certain depth strand Temperature variation curve, corner casts apart from the temperature variation curve of surface certain depth strand, leptoprosopy apart from surface certain depth The temperature variation curve of base.
- 9. the method for the continuous casting and rolling quenching technological design according to any one of claim 1~6, it is characterised in that step (3) in, the flow characteristics position includes：Continuous casting draw sedan-chair seat in the plane is put, fire cuts end position, turn over cooling bed position, hot sending process Ejection roller way and rollgang position, heating furnace position, bloom roll position, stay-warm case position, heater position.
- 10. the method for continuous casting and rolling quenching technological design according to claim 1, it is characterised in that in step (5), institute Stating the method for the position for determining to perform quenching technique includes：According to brittle starting position, near brittle starting position, the execution that primarily determine that allows in an equipment in arrangement is quenched The position of cold technique；It is corresponding to obtain the distance between brittle starting position and the position of execution quenching technique primarily determined that poor Δ X, wherein X The position of X-axis coordinate in temperature changing curve diagram；Judge whether Δ X meets | Δ X |≤| Δ Xcri |, wherein Δ Xcri be brittle starting position before and after quenching effectively and will not Cause the critical length of quenching crackle；If satisfied, the position for determining the execution quenching technique primarily determined that is the position for determining to perform quenching technique；If not satisfied, then redefine the position of an execution quenching technique；Untill above-mentioned condition is met.
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Cited By (6)
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| CN112380688A (en) * | 2020-11-10 | 2021-02-19 | 衡阳华菱钢管有限公司 | Method for determining casting blank temperature and feeding temperature, storage medium and processor |
| CN113176292A (en) * | 2021-03-23 | 2021-07-27 | 中冶南方连铸技术工程有限责任公司 | Judgment method for grain boundary embrittlement of casting blank |
| CN113174467A (en) * | 2021-03-23 | 2021-07-27 | 中冶南方连铸技术工程有限责任公司 | Method for predicting casting blank quenching structure and method for making casting blank quenching process |
| CN114990291A (en) * | 2022-06-16 | 2022-09-02 | 东北大学 | Two-section continuous casting hot charging quenching temperature control method |
| CN115351256A (en) * | 2022-07-25 | 2022-11-18 | 中冶南方连铸技术工程有限责任公司 | Method for determining optimal quenching time of surface quenching system |
| CN115446278A (en) * | 2022-08-12 | 2022-12-09 | 中冶南方连铸技术工程有限责任公司 | Surface quenching process display design method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112380688A (en) * | 2020-11-10 | 2021-02-19 | 衡阳华菱钢管有限公司 | Method for determining casting blank temperature and feeding temperature, storage medium and processor |
| CN112380688B (en) * | 2020-11-10 | 2024-04-02 | 衡阳华菱钢管有限公司 | Method for determining casting blank temperature and furnace feeding temperature, storage medium and processor |
| CN113176292A (en) * | 2021-03-23 | 2021-07-27 | 中冶南方连铸技术工程有限责任公司 | Judgment method for grain boundary embrittlement of casting blank |
| CN113174467A (en) * | 2021-03-23 | 2021-07-27 | 中冶南方连铸技术工程有限责任公司 | Method for predicting casting blank quenching structure and method for making casting blank quenching process |
| CN113174467B (en) * | 2021-03-23 | 2023-02-24 | 中冶南方连铸技术工程有限责任公司 | Method for predicting casting blank quenching structure and method for making casting blank quenching process |
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| CN114990291B (en) * | 2022-06-16 | 2023-02-28 | 东北大学 | Two-section continuous casting hot charging quenching temperature control method |
| CN115351256A (en) * | 2022-07-25 | 2022-11-18 | 中冶南方连铸技术工程有限责任公司 | Method for determining optimal quenching time of surface quenching system |
| CN115351256B (en) * | 2022-07-25 | 2024-04-05 | 中冶南方连铸技术工程有限责任公司 | Method for determining optimal quenching time of surface quenching system |
| CN115446278A (en) * | 2022-08-12 | 2022-12-09 | 中冶南方连铸技术工程有限责任公司 | Surface quenching process display design method |
| CN115446278B (en) * | 2022-08-12 | 2024-05-17 | 中冶南方连铸技术工程有限责任公司 | Surface quenching process display design method |
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