CN106269871A - A kind of method producing line employing increasing speed rolling technique production thickness≤2.0mm low-intensity strip steel at CSP - Google Patents
A kind of method producing line employing increasing speed rolling technique production thickness≤2.0mm low-intensity strip steel at CSP Download PDFInfo
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- CN106269871A CN106269871A CN201610751652.8A CN201610751652A CN106269871A CN 106269871 A CN106269871 A CN 106269871A CN 201610751652 A CN201610751652 A CN 201610751652A CN 106269871 A CN106269871 A CN 106269871A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
Abstract
A kind of method producing line employing increasing speed rolling technique production thickness≤2.0mm low-intensity strip steel at CSP, its step: conventional smelting, external refining are also casting continuously to form base；Strand is carried out soaking；After high pressure descaling, enter mm finishing mill unit, use increasing speed rolling pattern to roll；Batch after conventional section cooling.The present invention solves the too fast threading speed that there is currently and throws steel speed, cause head to roll brokenly, afterbody whipping frequent, steel scrap, disconnected water, the production such as roll marks and quality accident more, at the uniform velocity roll pure to roll the time longer, limit the buffer capacity of soaking pit and the raising of rhythm of production, the deficiency that serious restriction roll line troubleshooting and thin material yield promote, and the casting machine fall pulling rate time can be reduced, it is substantially reduced oven improvement.
Description
Technical field
The present invention relates to a kind of low-intensity steel-sheet production method, specifically belong to a kind of in CSP product line employing raising speed
Rolling mill practice produces the method for thickness≤2.0mm low-intensity strip steel, and spy is applicable to tensile strength less than 490MPa, and thickness≤
The production method of the steel plate of 2.0mm.
Background technology
CSP is the sheet billet continuous casting and rolling production line of latest generation, and it has, and flow process is short, low cost, product grains is tiny,
Intensity height and dimensional accuracy advantages of higher.CSP production thin material has superiority than conventional hot rolling in theory, but this advantage simply embodies
Equipment arrange and technological process on, this advantage to be converted into out and out product advantage, then need technology research and development and
Application is as supporting.CSP thin material produces and there is a following difficult problem at present: (1) strip steel is respectively at machine during threading and throwing steel
Opening without building and lose a stage between frame, strip steel, not by the tension force effect of rolling direction, the problem that there is shape wave and sideslip, needs to rely on
Both sides roll gap is adjusted, it is ensured that rolling stability, particularly during thin gauge strip rolling, and too fast threading speed and throwing steel speed
Degree is unfavorable for the adjustment of plate shape, easily occurs head to roll broken and the situation of afterbody whipping, cause steel scrap, break water, roll marks etc. a series of
Produce and quality problems；(2) CSP produces line mm finishing mill unit is that seven frames at the uniform velocity roll, and at the uniform velocity rolls that pure to roll the time long, limits all
The buffer capacity of hot stove and the raising of rhythm of production, the process of serious restriction roll line fault and the raising of thin material yield.
At the beginning of CSP produces line design, mm finishing mill unit uses the pattern at the uniform velocity rolled, but at the uniform velocity rolls when thin gauge strip rolls
The drawback of molding formula gradually manifests, and it is too fast that strip steel head threading speed and afterbody throw steel speed, and plate shape adjustment difficulty is big, and unfavorable
In improving production efficiency.Increasing speed rolling refers to elder generation's low speed threading during rolled band steel, to be reeled sting steel after strip steel Tong Bu with coiling machine
Raising speed carries out high-speed rolling, is rolled to reduction of speed during afterbody and carries out the method that low speed throws steel.Increasing speed rolling produces line application in conventional hot rolling
More, its method can effectively reduce strip steel head and tail temperature difference, improves rolling mill efficiency.
CSP product line is for line is produced in conventional hot rolling, and equipment is arranged and process conditions are entirely different, and conticaster passes through roller
Low-head soaking pit is connected with mm finishing mill unit, and roller low-head soaking pit has buffering and the effect of regulation rhythm of production, and slab is from soaking
Stove out after be directly entered mm finishing mill unit without roughing and roll, make mm finishing mill unit each frame roll-force be significantly increased.This
Outward, section cooling line is shorter, realizes control target temperature difficulty the biggest on shorter cooling line.So cannot be with reference to conventional heat
The increasing speed rolling rolling product line carries out the increasing speed rolling technological design of CSP product line, and increasing speed rolling technique is not also at similar CSP simultaneously
Produce the precedent of line application.Therefore, corresponding research need to be carried out and produce line employing increasing speed rolling technique to inquire at CSP
The method producing thickness≤2.0mm low-intensity strip steel.
Summary of the invention
The invention reside in and provide one solution to be less than in CSP product line production thickness≤2.0mm, tensile strength at present
During 490MPa strip steel, head rolls brokenly and afterbody whipping is frequent, steel scrap, disconnected water, the production such as roll marks and quality accident more,
Soaking pit buffer capacity is not enough, the problem that rhythm of production is nervous, and can reduce the casting machine reduction pulling rate time, and reduces oven improvement
Method.
Realize the measure of above-mentioned purpose:
A kind of method producing line employing increasing speed rolling technique production thickness≤2.0mm low-intensity strip steel at CSP, its step:
1) carry out conventional smelting, external refining and be casting continuously to form base, and controlling opening of continuous casting billet and water thickness at 70mm, from the second block casting
Base starts, and uses wick-containing pressure to reduce the thickness of strand to 55～60mm；
2) strand is carried out soaking, control strand tapping temperature at 1150～1200 DEG C；
3) after high pressure descaling, enter mm finishing mill unit, use increasing speed rolling pattern to roll, it may be assumed that low speed threading → high-speed rolling
→ low speed throws steel；F1 ~ F3 interstand cooling water water yield is set according to the 50-90% of the specified water yield；Control finishing temperature to exist
840～880 DEG C；
Threading speed controlling is 9～10.5m/s, and the highest mill speed controls 12～16m/s, throw steel speed controlling 10～
12m/s；
4) batch after conventional section cooling, and control coiling temperature at 560～660 DEG C.
It is: the speed of high-speed rolling and coiling machine synchronous raising speed.
The effect of main technique and mechanism in the present invention
Why the present invention uses increasing speed rolling technique, is: controls the strip steel head speed of service and wears under 9 ~ 10.5m/s
Band, to reduce the risk that head folds and rolls brokenly；With coiling machine synchronous raising speed after control head threading, the highest mill speed is 12
～16m/s, to reduce pure rolling the time, increase soaking pit buffer time；Control the strip speed when being rolled to afterbody to drop to
10 ~ 12m/s carries out throwing steel, to give operator's more plate shape regulation and control time, it is to avoid whipping.
The present invention compared with prior art, solves the too fast threading speed that there is currently and throws steel speed, causing head
Portion rolls brokenly, afterbody whipping is frequent, steel scrap, disconnected water, the production such as roll marks and quality accident more, at the uniform velocity roll pure rolls the time relatively
Long, limit the buffer capacity of soaking pit and the raising of rhythm of production, serious restriction roll line troubleshooting and thin material yield carry
The deficiency risen, and the casting machine fall pulling rate time can be reduced, it is substantially reduced oven improvement.
Detailed description of the invention
Below the present invention is described in detail:
Embodiment 1
It is the steel grade of Q235B that the present embodiment produces the finished product trade mark, rolling width 1000 mm, product thickness 1.4mm, tensile strength
For 480MPa；
Production stage:
1) carry out conventional smelting, external refining and be casting continuously to form base, and controlling opening of continuous casting billet and water thickness at 70mm, from the second block casting
Base starts, the thickness of employing wick-containing pressure reduction strand to 55mm；
2) strand carrying out soaking, strand tapping temperature is at 1165 DEG C；
3) rolling slab after high pressure descaling, rolling uses increasing speed rolling pattern to carry out, it may be assumed that low speed threading → head is worn
Carrying out high-speed rolling → low speed after band with coiling machine synchronous raising speed and throw steel, wherein, threading speed is 10.2m/s；The highest rolling speed
Degree is 15m/s, and it keeps Tong Bu with coiling machine speed；Throw steel speed at 10.8m/s；
F1 ~ F3 interstand cooling water water yield is according to 80% setting of the specified water yield, and finishing temperature is at 860 DEG C；
4) batching after conventional section cooling, coiling temperature is at 560 DEG C.
Through inspection statistics, strip steel head unfolded and roll brokenly, afterbody without whipping phenomenon, in whole production process, casting machine does not has
Fall pulling rate, does not the most occur quality to change the original sentence to problem, and product is qualified.
Embodiment 2
It is SPHC-B steel grade that the present embodiment produces the finished product trade mark, and rolling width 1219 mm, product thickness 1.2mm, tensile strength is
370MPa；
Production stage:
1) carry out conventional smelting, external refining and be casting continuously to form base, and controlling opening of continuous casting billet and water thickness at 70mm, from the second block casting
Base starts, the thickness of employing wick-containing pressure reduction strand to 55mm；
2) strand carrying out soaking, strand tapping temperature is at 1185 DEG C；
3) rolling slab after high pressure descaling, rolling uses increasing speed rolling pattern to carry out, it may be assumed that low speed threading → head is worn
Carrying out high-speed rolling → low speed after band with coiling machine synchronous raising speed and throw steel, wherein, threading speed is 10.5m/s；The highest rolling speed
Degree is 15.5m/s, and it keeps Tong Bu with coiling machine speed；Throw steel speed at 11m/s；
F1 ~ F3 interstand cooling water water yield is according to 90% setting of the specified water yield, and finishing temperature is at 850 DEG C；
4) batching after conventional section cooling, coiling temperature is at 620 DEG C.
Through inspection statistics, strip steel head unfolded and roll brokenly, afterbody without whipping phenomenon, in whole production process, casting machine does not has
Fall pulling rate, does not the most occur quality to change the original sentence to problem, and product is qualified.
Embodiment 3
It is the steel grade of SAE1006 that the present embodiment produces the finished product trade mark, and rolling width 1212 mm, product thickness 1.8mm, tension is strong
Degree is 360MPa；
Production stage:
1) carry out conventional smelting, external refining and be casting continuously to form base, and controlling opening of continuous casting billet and water thickness at 70mm, from the second block casting
Base starts, the thickness of employing wick-containing pressure reduction strand to 60mm；
2) strand carrying out soaking, strand tapping temperature is at 1160 DEG C；
3) rolling slab after high pressure descaling, rolling uses increasing speed rolling pattern to carry out, it may be assumed that low speed threading → head is worn
Carrying out high-speed rolling → low speed after band with coiling machine synchronous raising speed and throw steel, wherein, threading speed is 10m/s；The highest mill speed
For 14m/s, it keeps Tong Bu with coiling machine speed；Throw steel speed at 10.5m/s；
F1 ~ F3 interstand cooling water water yield is according to 60% setting of the specified water yield, and finishing temperature is at 873 DEG C；
4) batching after conventional section cooling, coiling temperature is at 630 DEG C.
Through inspection statistics, strip steel head unfolded and roll brokenly, afterbody without whipping phenomenon, in whole production process, casting machine does not has
Fall pulling rate, does not the most occur quality to change the original sentence to problem, and product is qualified.
Embodiment 4
It is the steel grade of SAE1008 that the present embodiment produces the finished product trade mark, rolling width 1230mm, product thickness 2.0mm, tensile strength
For 350MPa；
Production stage:
1) carry out conventional smelting, external refining and be casting continuously to form base, and controlling opening of continuous casting billet and water thickness at 70mm, from the second block casting
Base starts, the thickness of employing wick-containing pressure reduction strand to 60mm；
2) strand carrying out soaking, strand tapping temperature is at 1150 DEG C；
3) rolling slab after high pressure descaling, rolling uses increasing speed rolling pattern to carry out, it may be assumed that low speed threading → head is worn
Carrying out high-speed rolling → low speed after band with coiling machine synchronous raising speed and throw steel, wherein, threading speed is 9.5m/s；The highest mill speed
For 13m/s, it keeps Tong Bu with coiling machine speed；Throw steel speed at 10m/s；
F1 ~ F3 interstand cooling water water yield is according to 50% setting of the specified water yield, and finishing temperature is at 880 DEG C；
4) batching after conventional section cooling, coiling temperature is at 640 DEG C.
Through inspection statistics, strip steel head unfolded and roll brokenly, afterbody without whipping phenomenon, in whole production process, casting machine does not has
Fall pulling rate, does not the most occur quality to change the original sentence to problem, and product is qualified.
Embodiment 5
It is S235JR+AR steel grade that the present embodiment produces the finished product trade mark, and rolling width 1250 mm, product thickness 1.5mm, tension is strong
Degree is 400MPa；
Production stage:
1) carry out conventional smelting, external refining and be casting continuously to form base, and controlling opening of continuous casting billet and water thickness at 70mm, from the second block casting
Base starts, the thickness of employing wick-containing pressure reduction strand to 55mm；
2) strand carrying out soaking, strand tapping temperature is at 1175 DEG C；
3) rolling slab after high pressure descaling, rolling uses increasing speed rolling pattern to carry out, it may be assumed that low speed threading → head is worn
Carrying out high-speed rolling → low speed after band with coiling machine synchronous raising speed and throw steel, wherein, threading speed is 10.3m/s；The highest rolling speed
Degree is 15.2m/s, and it keeps Tong Bu with coiling machine speed；Throw steel speed at 10.9m/s；
F1 ~ F3 interstand cooling water water yield is according to 75% setting of the specified water yield, and finishing temperature is at 868 DEG C；
4) batching after conventional section cooling, coiling temperature is at 570 DEG C.
Through inspection statistics, strip steel head unfolded and roll brokenly, afterbody without whipping phenomenon, in whole production process, casting machine does not has
Fall pulling rate, does not the most occur quality to change the original sentence to problem, and product is qualified.
This detailed description of the invention is only and most preferably enumerates, the not restricted enforcement to technical solution of the present invention.
Claims (2)
1. producing, at CSP, the method that line uses increasing speed rolling technique to produce thickness≤2.0mm low-intensity strip steel, its feature exists
In: its step:
1) carry out conventional smelting, external refining and be casting continuously to form base, and controlling opening of continuous casting billet and water thickness at 70mm, from the second block casting
Base starts, and uses wick-containing pressure to reduce the thickness of strand to 55～60mm；
2) strand is carried out soaking, control strand tapping temperature at 1150～1200 DEG C；
3) after high pressure descaling, enter mm finishing mill unit, use increasing speed rolling pattern to roll, it may be assumed that low speed threading → high-speed rolling
→ low speed throws steel；F1 ~ F3 interstand cooling water water yield is set according to the 50-90% of the specified water yield；Control finishing temperature to exist
840～880 DEG C；
Controlling the strip steel head speed of service and control 9～10.5m/s, the highest mill speed controls 12～16m/s, throws steel speed
Control 10～12m/s
4) batch after conventional section cooling, and control coiling temperature at 560～660 DEG C.
2. as claimed in claim 1 a kind of at CSP product line employing increasing speed rolling technique production thickness≤2.0mm low-intensity strip steel
Method, it is characterised in that: the speed of high-speed rolling and coiling machine synchronous raising speed.
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| CN201610751652.8A CN106269871B (en) | 2016-08-30 | 2016-08-30 | A kind of method for using increasing speed rolling technique productions thickness≤2.0mm low-intensity strips in CSP producing lines |
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| CN201610751652.8A CN106269871B (en) | 2016-08-30 | 2016-08-30 | A kind of method for using increasing speed rolling technique productions thickness≤2.0mm low-intensity strips in CSP producing lines |
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| CN106269871B CN106269871B (en) | 2017-12-08 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107617647A (en) * | 2017-09-13 | 2018-01-23 | 武汉钢铁有限公司 | The method that CSP produces thickness≤1.2mm hot-strips |
| CN107828951A (en) * | 2017-10-16 | 2018-03-23 | 首钢京唐钢铁联合有限责任公司 | A kind of method and device for manufacturing cold rolling high-strength steel |
| CN110317995A (en) * | 2019-06-03 | 2019-10-11 | 武汉钢铁有限公司 | A method of with carbon hot rolled steel plate in the CSP production good thin gauge of surface quality |
| CN113680818A (en) * | 2021-06-22 | 2021-11-23 | 武汉钢铁有限公司 | CSP flow-based SAE1006 thin material manufacturing method |
| CN114535316A (en) * | 2022-02-08 | 2022-05-27 | 邯郸钢铁集团有限责任公司 | Method for controlling coiling temperature of hot-rolled high-strength dual-phase steel |
| CN114602977A (en) * | 2022-02-14 | 2022-06-10 | 唐山钢铁集团有限责任公司 | Control method for throwing steel and drifting of hot-rolled strip steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107617647A (en) * | 2017-09-13 | 2018-01-23 | 武汉钢铁有限公司 | The method that CSP produces thickness≤1.2mm hot-strips |
| CN107828951A (en) * | 2017-10-16 | 2018-03-23 | 首钢京唐钢铁联合有限责任公司 | A kind of method and device for manufacturing cold rolling high-strength steel |
| CN107828951B (en) * | 2017-10-16 | 2019-12-03 | 首钢京唐钢铁联合有限责任公司 | A kind of method and device manufacturing cold rolling high-strength steel |
| CN110317995A (en) * | 2019-06-03 | 2019-10-11 | 武汉钢铁有限公司 | A method of with carbon hot rolled steel plate in the CSP production good thin gauge of surface quality |
| CN110317995B (en) * | 2019-06-03 | 2020-08-25 | 武汉钢铁有限公司 | Method for producing thin medium-carbon hot-rolled steel plate with good surface quality by using CSP (cast Steel plate) |
| CN113680818A (en) * | 2021-06-22 | 2021-11-23 | 武汉钢铁有限公司 | CSP flow-based SAE1006 thin material manufacturing method |
| CN114535316A (en) * | 2022-02-08 | 2022-05-27 | 邯郸钢铁集团有限责任公司 | Method for controlling coiling temperature of hot-rolled high-strength dual-phase steel |
| CN114535316B (en) * | 2022-02-08 | 2023-10-03 | 邯郸钢铁集团有限责任公司 | Coiling temperature control method for hot-rolled high-strength dual-phase steel |
| CN114602977A (en) * | 2022-02-14 | 2022-06-10 | 唐山钢铁集团有限责任公司 | Control method for throwing steel and drifting of hot-rolled strip steel |
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Effective date of registration: 20170616 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Applicant after: Wuhan iron and Steel Company Limited Address before: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Applicant before: WUHAN IRON AND STEEL CORPORATION |
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