CN1475314A - No heating processing method in bar steel continuous casting and continuous rolling process - Google Patents
No heating processing method in bar steel continuous casting and continuous rolling process Download PDFInfo
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- CN1475314A CN1475314A CNA031501028A CN03150102A CN1475314A CN 1475314 A CN1475314 A CN 1475314A CN A031501028 A CNA031501028 A CN A031501028A CN 03150102 A CN03150102 A CN 03150102A CN 1475314 A CN1475314 A CN 1475314A
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Abstract
A technology for conticasting and tandem-rolling bar steel without heating is disclosed, which features that said bar steel may be circle with 50-400 mm for diameter or rectangle with 50-400 mm for side length and R5-175 mm of corner, the casting speed is 3-8 m/min, the temp of steel is 950-1250 deg.C for rolling, and cooling speed is 1-50 deg.C/S. Its advantages are high productivity and less consumption of energy.
Description
Invention field
The invention belongs to the shaping manufacture field of steel, mainly be applicable to bar shaped steel continuous casting and tandem rolling field.
The bar shaped steel are meant steel such as wire rod for sheet material, tubing, bar, small-sized material.
Prior art
The shaping of current steel processing now (casting and rolling) flow process is that molten steel is cast steel billet through conticaster, cutting to length, and last cold bed (or sending into heating furnace while hot), strand the stock put, and the heating furnace of packing into is come out of the stove, and de-scaling enters tandem mill or the semi-tandem rolling unit is rolling.Though this flow process has had very big progress than the ingot casting cogging pyrogene of manying material technology in the past, improving the metal lumber recovery, saving the energy, obvious superiority arranged aspect boosting productivity.But still being divided into forming process for two steps (continuous casting and rolling), this flow process on two lines, finishes successively, particularly must be between this two step through once heating.
People attempt the exploitation of continuous casting Direct Rolling Technology always, and continuous casting and rolling technique of sheet bar has been realized the online production of hot strip steel, but still do not break away from long (hundreds of rice is generally arranged) heating furnace.
Nearest Italian DANIELI company develops a kind of continuous casting and rolling special steel production procedure ECR without a head in ABS factory.Mainly comprise the high-speed continuous casting machine, two quenching water tanks, tunnel type soaking pit at the bottom of the roller of 125m length, 17 tandem mills, control cooling, cold bed, coiling machine etc.Because the kind requirement of this production line, it also must have soaking pit.
In order to raise labour productivity, when production bar shaped steel,, might realize fully not heating, online, continuous process entirely by the means such as production technology of control casting blank section shape, conticaster and tandem mill.
Goal of the invention
The object of the invention is the processing method that does not heat in a kind of bar shaped steel continuous casting and the continuous rolling process is provided, and it can realize production process online, continuous entirely in bar shaped steel continuous casting and the continuous rolling process.
Technical scheme
Based on above-mentioned purpose, the present invention relates to conticaster, rolling mill and the linking between them thereof, comprise specific casting blank section shape, conticaster, start rolling temperature control that can high speed casting.
Technical scheme characteristics of the present invention are that the steel forming process of finishing successively on conticaster and two lines of tandem mill is finished continuously, promptly cancel heating furnace in the middle of continuous casting and continuous rolling process, the technological requirement of casting blank section shape need, conticaster and the tandem mill of its production kind is as follows:
Described casting blank section shape need comprises the rectangle (comprising square) of the circle of diameter (major diameter) 50-400mm and oval, length of side 50-400mm and has the fillet of R5-175mm;
Described conticaster require can continous-stable to cast the in high quality strand of above-mentioned section, casting rate is 3-8m/min, its fluxion is 1-3; Its ejection temperature, casting rate, production capacity with after the rolling requirement that connects conform to;
Described tandem mill requires high strength, big roll-force, and the temperature range that adapts to strand is at 950-1250 ℃, and beginning mill speed and strand casting speed mate.The key of start rolling temperature control is the even of strand temperature, and strand inside evenly is to rely on above-mentioned casting blank section shape to guarantee with surface temperature, is connected on line traffic control cooling unit behind the tandem rolling unit, 1-50 ℃/S of cooling velocity scope.
Start rolling temperature control among the present invention is characterized on conticaster secondary cooling control basis, according to rolling requirement, consider the base shell rise time, strand position, estimate the open rolling time, the measure that strand is cooled off, is incubated.
Another characteristics of above-mentioned start rolling temperature control are that the bulk temperature field that guarantees strand meets rolling requirement, and the key here is the even of temperature.Strand is inner to be reached with the even dependence samming of surface temperature, the measure of insulation.Casting billet surface temperature everywhere evenly relies on above-mentioned specific casting blank section shape to guarantee.
The invention effect
Compared with prior art, the invention has the advantages that:
1. save the energy in a large number, because on this production line, removed heating furnace;
2. reduce production line construction investment and spare parts consumption;
3. reduce circulating fund and take, because production process is finished fast;
4. improved labor productivity;
5. reduce land seizure.
Description of drawings
Fig. 1 is a production-line arrangement schematic diagram of the present invention.
Fig. 2, Fig. 3, Fig. 4, Fig. 5 are Temperature Distribution and the setting condition of continuous casting billet before entering milling train.
1 is continuous casting tundish and crystallizer among Fig. 1, the 2nd, and fan-shaped section, 3 are the straightening machine, 4 is continuous casting billet two cold-zones, and 5 is first section stay-warm case, and 6 is first hot shears, 7 is second section stay-warm case, and 8 is second hot shears, and 9 is dephosphorization apparatus, 10 is crop shears, and 11 is thick middle milling train group, and 12 is middle cooling water tank, 13 are cataclasm cutting, and 14 is mm finishing mill unit, and 15 for rolling back control cooling water tank, 16 cut for scale, and 17 is cold bed.
Among Fig. 2, Fig. 3, Fig. 4, Fig. 5, t is the time, and X is to the crystallizer distance, and T is a temperature, and D is a scull thickness, and Tc is a central temperature, and Ts is a surface temperature, and Tws is wide surface temperature, and Tns is narrow surface temperature, and Tco is the bight temperature, the Vc casting rate.
Molten steel begins to solidify in continuous casting tundish and crystallizer 1, at strand under the traction of straightening machine 3, through fan-shaped section 2 and continuous casting billet two cold-zones 4, enter first section stay-warm case 5 and second section stay-warm case 7 afterwards, be incubated, in this process, it is even that the temperature of continuous casting billet is tending towards, for follow-up stable rolling is out of shape the condition that provides the foundation, first hot shears 6 and second hot shears 8 are used for the online cutting of continuous casting billet, when the rolling process cisco unity malfunction, when rolling off the production line, uses continuous casting billet, continuous casting billet behind the samming is through dephosphorization apparatus 9 dephosphorization, after crop shears 10 carry out crop, entering thick middle milling train group 11 is rolled, middle cooling water tank 12 is used for cooling off through the steel billet that slightly rolls, to guarantee that intermediate blank enters mm finishing mill unit 14 and is rolled under suitable temperature, if the production line cisco unity malfunction, with the cataclasm 13 chopping intermediate blank of cutting, the steel of process mm finishing mill unit 14 have had the appearance and size of finished product, carry out online acceleration cooling through rolling back control cooling water tank 15, the final mechanical property of control steel afterwards, is cut 16 through scale and is cut into finished product length, enter cold bed 17, cooling, collection and treatment.
Stay-warm case 5 and 7 before the descaling device aims at does not have heating continuous casting and rolling consideration, and such configuration guarantees the temperature history of strand and distribute to reach the situation shown in the accompanying drawing 2.
Fig. 2 represents Temperature Distribution and the setting condition of continuous casting billet before entering milling train.Strand is forced cooling through 5 minutes (24m) earlier, enters first soaking zone through 3 minutes behind the air cooling again, finishes and solidifies.Go out to cut behind first soaking zone etc. necessary processing, be equivalent to air cooling.Enter second soaking zone after the 25th minute, 1120 ℃ at strand temperature center, 1040 ℃ on surface, about 980 ℃ in bight are fit to open rolling at this moment.Fig. 3,4,5 similar to Fig. 2, but different with casting rate according to the specification of strand, required time and length have certain difference.
The each point temperature of strand is fit to open rolling all between 950 ~ 1250 ℃ in given section according to the method described in the present invention.Reached the purpose that does not heat in steel continuous casting and the continuous rolling process.
Embodiment
Present embodiment adopts the Q215 continuous casting billet of several casting blank section shapes, heating process in the middle of the cancellation continuous casting billet, and it is 300～400 degree that the saving heating energy source is amounted to into power consumption, the mechanical property of its technological parameter and product sees Table 1.
Table 1: the mechanical property of its technological parameter and product
| Sequence number | The casting blank section shape | Casting speed m/min | Start rolling temperature ℃ | Finishing temperature ℃ | Final cooling temperature ℃ | Mechanical property | ||
| Yield strength MPa | Tensile strength MPa | Percentage elongation % | ||||||
| ??1 | Diameter is the circle of 180mm | 4.8 | ??1020 | ??880 | ??690 | ??392 | ??541 | ??29 |
| ??2 | Diameter is the circle of 200mm | 3.5 | ??1000 | ??890 | ??680 | ??389 | ??539 | ??30 |
| ??3 | The length of side is 120mm square and the fillet that has R15mm | 6.0 | ??1050 | ??900 | ??703 | ??386 | ??536 | ??28 |
| ??4 | The length of side is 150mm square and the fillet that has R25mm | 4.5 | ??1100 | ??905 | ??697 | ??371 | ??535 | ??29 |
| ??5 | The length of side is the rectangle of 210*175mm and the fillet that has R30mm | 4.8 | ??1120 | ??920 | ??685 | ??372 | ??532 | ??31 |
| ??6 | The length of side is the rectangle of 312*240mm and the fillet that has R50mm | 3.0 | ??1030 | ??923 | ??696 | ??368 | ??530 | ??30 |
Embodiment has illustrated that method of the present invention is feasible, and the steel product quality performance of gained is reliable.
Claims (1)
1, the processing method that does not heat in a kind of bar shaped steel continuous casting and the continuous rolling process, the steel forming process that to finish successively on conticaster and two lines of tandem mill is connected into a line, realize that the bar shaped steel do not heat, online, continuous production entirely, be characterized in cancellation heating process in the middle of continuous casting and continuous rolling process, promptly cancel heating furnace in the middle of continuous casting and continuous rolling process, the technological requirement of its production kind casting blank section shape need, conticaster and tandem mill is as follows:
Described casting blank section shape need comprises the circle of diameter 50-400mm, the rectangle of length of side 50-400mm (comprising square) and has the fillet of R5-175mm;
Described conticaster require can continous-stable to cast the in high quality strand of above-mentioned section, casting rate is 3-8m/min, its fluxion is 1-3; Its ejection temperature, casting rate, production capacity with after the rolling requirement that connects conform to;
Described tandem mill requires the temperature range of strand at 950-1250 ℃, the key of start rolling temperature control is the even of strand temperature, strand inside evenly is to rely on above-mentioned casting blank section shape and stay-warm case to guarantee with surface temperature, be connected on line traffic control cooling unit behind the tandem rolling unit, 1-50 ℃/S of cooling velocity scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031501028A CN1475314A (en) | 2003-07-18 | 2003-07-18 | No heating processing method in bar steel continuous casting and continuous rolling process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031501028A CN1475314A (en) | 2003-07-18 | 2003-07-18 | No heating processing method in bar steel continuous casting and continuous rolling process |
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| CN1475314A true CN1475314A (en) | 2004-02-18 |
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| CNA031501028A Pending CN1475314A (en) | 2003-07-18 | 2003-07-18 | No heating processing method in bar steel continuous casting and continuous rolling process |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100382906C (en) * | 2005-04-21 | 2008-04-23 | 天津钢铁有限公司 | High-carbon steel wire rod manufacturing technique |
| CN100396391C (en) * | 2005-09-01 | 2008-06-25 | 中冶东方工程技术有限公司 | Thin steel belt casting and rolling production process |
| CN100438997C (en) * | 2005-05-20 | 2008-12-03 | 中冶东方工程技术有限公司 | Compact medium-width strip steel production process |
| CN102198494A (en) * | 2011-05-09 | 2011-09-28 | 上海亚新冶金设备有限公司 | Novel rectangular casting blank section |
| CN103480647A (en) * | 2013-09-18 | 2014-01-01 | 陕西钢铁集团有限公司 | Device and method for manufacturing reinforcing steel bars by means of directly rolling small square billets at low temperatures without heating |
| CN103480649A (en) * | 2013-10-12 | 2014-01-01 | 钢铁研究总院 | Method for producing long section bar in direct rolling mode |
| CN105414185A (en) * | 2016-01-08 | 2016-03-23 | 中冶赛迪工程技术股份有限公司 | Continuous casting and rolling production line of wire rods and production method of production line |
| CN109530646A (en) * | 2018-12-27 | 2019-03-29 | 钢铁研究总院 | For reducing the control method of head and tail temperature difference before direct rolling process continuous casting billet rolls |
| CN113477705A (en) * | 2021-07-08 | 2021-10-08 | 承德建龙特殊钢有限公司 | Rolling device for replacing blanks with different specifications and rolling method thereof |
-
2003
- 2003-07-18 CN CNA031501028A patent/CN1475314A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100382906C (en) * | 2005-04-21 | 2008-04-23 | 天津钢铁有限公司 | High-carbon steel wire rod manufacturing technique |
| CN100438997C (en) * | 2005-05-20 | 2008-12-03 | 中冶东方工程技术有限公司 | Compact medium-width strip steel production process |
| CN100396391C (en) * | 2005-09-01 | 2008-06-25 | 中冶东方工程技术有限公司 | Thin steel belt casting and rolling production process |
| CN102198494A (en) * | 2011-05-09 | 2011-09-28 | 上海亚新冶金设备有限公司 | Novel rectangular casting blank section |
| CN103480647A (en) * | 2013-09-18 | 2014-01-01 | 陕西钢铁集团有限公司 | Device and method for manufacturing reinforcing steel bars by means of directly rolling small square billets at low temperatures without heating |
| CN103480647B (en) * | 2013-09-18 | 2016-03-23 | 陕西钢铁集团有限公司 | A kind of device and production method thereof of producing reinforcing bar without heating low temperature Direct Rolling small billet |
| CN103480649A (en) * | 2013-10-12 | 2014-01-01 | 钢铁研究总院 | Method for producing long section bar in direct rolling mode |
| CN103480649B (en) * | 2013-10-12 | 2016-10-05 | 钢铁研究总院 | A kind of Direct Rolling produces the method for long profiles |
| CN105414185A (en) * | 2016-01-08 | 2016-03-23 | 中冶赛迪工程技术股份有限公司 | Continuous casting and rolling production line of wire rods and production method of production line |
| CN109530646A (en) * | 2018-12-27 | 2019-03-29 | 钢铁研究总院 | For reducing the control method of head and tail temperature difference before direct rolling process continuous casting billet rolls |
| CN109530646B (en) * | 2018-12-27 | 2020-10-16 | 钢铁研究总院 | Control method for reducing temperature difference between head and tail of continuous casting billet in direct rolling process |
| CN113477705A (en) * | 2021-07-08 | 2021-10-08 | 承德建龙特殊钢有限公司 | Rolling device for replacing blanks with different specifications and rolling method thereof |
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