CN101219439A - Method for producing thin format hot rolled steel plate - Google Patents
Method for producing thin format hot rolled steel plate Download PDFInfo
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- CN101219439A CN101219439A CNA2008100260215A CN200810026021A CN101219439A CN 101219439 A CN101219439 A CN 101219439A CN A2008100260215 A CNA2008100260215 A CN A2008100260215A CN 200810026021 A CN200810026021 A CN 200810026021A CN 101219439 A CN101219439 A CN 101219439A
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Abstract
The invention discloses a production method for a light-gauge hot rolled steel plate, which comprises the steps that: a. the distance between an upper roller and a lower roller of each frame of a hot strip mill is adjusted and the percent of reduction epsilon 1 of a first frame is adjusted to be 53 percent to 63 percent, wherein, the epsilon 1 is equal to (H1-h1)/H1, therein, H1 is the thickness of a slab at an inlet of the frame, h1 is the thickness of a slab at an outlet of the fame; b. high temperature slabs are sent to a rolling inlet of the frames that are arranged in sequence for rolling; c. the light-gauge hot rolled steel plate is output from a rolling outlet of a last frame after the slabs are rolled by the varied frames. The invention promotes the percent of reduction of the first frame as high as possible when ensuring security to reduce the load of rollers of rear frames, thereby improving rolling efficiency and product quality.
Description
Technical field
The present invention relates to the steel rolling field, be specifically related to a kind of production method of thin format hot rolled steel plate.
Background technology
Thin format hot rolled steel plate is meant the hot rolled steel plate that thickness 2.0mm is following, traditional process steel mill is when producing thin format hot rolled steel plate, the slab rolling that adopts 30～35mm is to the specification below the 2.0mm, have only 93% by slab to the total deformation of finished product, therefore (each frame is F1 from front to back successively to be assigned to each frame, F2, F3, F4 ...) deflection less, even the F1 of deflection maximum, F2, F3 can not surpass 50% yet, because deflection is little, needed rolling load is also lower, bar strip continuous casting and rolling flow path finishing mill inlet slab thickness reaches 50～70mm, reach 97% by slab to the total deformation of finished product, be higher than traditional milling train far away; During therefore rolling thin format hot rolled steel plate, each frame rolling reduction is considerably beyond general milling train.Big deflection will inevitably bring bigger rolling load, thereby produces variety of issue in the thin format hot rolled steel plate production process, mainly shows the following aspects:
1, according to rolling load distribution principle commonly used, several frames should be distributed big load as far as possible before the milling train, at high temperature finish big deflection so that make strand as far as possible, but the F1 frame is considered the problem that slab is nipped, if deflection is excessive, may cause slab not nip, so the setting of the reduction ratio of F1 frame is generally more conservative, generally all is set in about 50%; During rolling thin format hot rolled steel plate, total deflection increases, and the deflection of F1 is less than normal, causes the afer bay deflection excessive, causes the afer bay rolling load excessive;
2, F3, F4 frame rolling load are excessive, and frame vibration is serious, and the roller surface oxide-film peels off easily simultaneously, causes belt steel surface iron scale mass defect;
3, F5, F6 frame rolling load are excessive, cause the plat control system can't online adjustment shape wave, are easy to generate flatness defect.
In order to address the above problem, realize the production in enormous quantities of thin format hot rolled steel plate, each steel mill has taked multiple measure, and passing through of having increases roughing mill before finishing mill, reduces mm finishing mill unit roll inlet slab thickness, thereby reduce rolling load, adopt the method to need bigger economy input, full factory and office are in end-of-life state construction period simultaneously, and production is had considerable influence, part steel mill does not have the space can install this equipment additional because site space is limit yet in addition; Part steel mill is a cost to sacrifice output, by slab thickness is reduced to 50mm even thinner by 60mm, thereby reduces the rolling load of finishing mill, adopts the method, and production capacity is had bigger influence.Same rhythm of production, with the strand of 50mm with compare with the production of 60mm strand, production capacity reduces about 20%, all can affect greatly enterprise production, cost.
Summary of the invention
The object of the present invention is to provide a kind of method that adopts continuous hot-rolling mill to produce thin format hot rolled steel plate, adopt this method after, can improve rolling efficient and quality easily.
The present invention is achieved through the following technical solutions:
A kind of production method of thin format hot rolled steel plate, this method comprises the steps:
Distance in a, the adjustment continuous hot-rolling mill between upper and lower two rolls of each frame, and making the reduction ratio ε 1 of first frame is 53% to 63%, wherein, and ε 1=(H1-h1)/H1, H1 is first frame inlet slab thickness, and h1 is first frame outlet slab thickness;
B, the roll inlet that the slab of high temperature is sent into the frame that sets gradually are rolled, and the start rolling temperature of slab is in 1120 ℃ to 1150 ℃ scopes, and finishing temperature is in 885 ℃ to 930 ℃ scopes;
C, slab are after the roll on each frame is rolling, and thin format hot rolled steel plate is from last breast roller outlet output.
Among the present invention, the F1 frame adopts bigger reduction ratio ε 1, and its basis is:
1,, redefines the F1 frame in the maximum reduction that guarantees to realize under the prerequisite that strand is nipped by recomputating the nip angle of F1; Nip angle can be calculated by following method:
According to the Ge Lujiefu computing formula, the coefficient of friction f when nipping between roll and band steel
bCan use formula＜1〉calculate:
f
b＝K
1K
2(0.84-0.0004t) <1>
In the formula: f
b---the coefficient of friction when nipping between roll and band steel;
K
1---consider the influence coefficient of roll material and surface state,, get 0.9 for grain roll;
K
2---consider the influence coefficient of mill speed, for the F1 mill speed between 0～1m/s the time desirable 1.0;
T---rolling temperature (℃), get 1140 ℃ for operating mode of the present invention.
By formula＜1〉F1 nips in the time of can calculating rolling temperature and be 1140 ℃ coefficient of friction f
bNumerical value:
f
b＝0.9×1.0×(0.84-0.0004×1140)＝0.3456
Bite condition according to hot rolled steel plate when rolling will make rolled piece nip as can be known, and critical condition is the coefficient of friction f of the tangent value of nip angle α when equaling to begin to nip
b, i.e. f
bDuring=tan α, milling train just can be nipped.The value that can calculate nip angle α thus is: α=arctanf
b=arctan0.3456=19 °.
Ask for an interview Fig. 1, frame drafts Δ h
Δh＝H-h；
H---frame inlet slab thickness;
H---frame outlet slab thickness;
Relation between nip angle and band steel drafts and the roller diameter can be used formula＜2〉expression:
Δh＝D(1-cosα) <2>
In the formula: D---roller diameter;
α---nip angle;
Because roller diameter is more little, steel is difficult more nips for band, therefore as long as the minimum diameter roll can be realized nipping, just can guarantee normally nipping when rolling.
Frame reduction ratio ε can be by formula＜3〉calculate:
In the formula: ε---the frame reduction ratio;
For existing most of sheet billet continuous hot-rolling mill, its thickness of strand is 60mm, so H gets 60mm at this; Roller diameter D minimum of a value is 720mm, brings D, H into formula＜2 respectively 〉,＜3 calculate and can get:
The F1 maximum reduction is Δ h
Δh＝720×(1-cos19°)＝39.24mm
F1 frame maximum depression rate ε
ε＝39.24/60×100％＝65％
By calculated data as can be known, when rolling thin format hot rolled steel plate, the reduction ratio of F1 is set to 65% the rolled piece situation of can not nipping just can occur, and the reduction ratio of setting in the existing operation of rolling 50% is well below 65%; With this result is foundation, has reformulated the mill load distribution; F1 nips in order to ensure first frame, reduction ratio during actual production can be slightly less than calculated value (as getting 60%), because total deflection does not increase, therefore after the reduction ratio of F1 increases, the reduction ratio of F3～F6 frame can be reduced, can improve the rolling efficiency and the quality of thin format hot rolled steel plate easily.
After the reduction ratio of first frame F1 configured, its reduction ratio was carried out by hydraulic pressure roll gap control system; Simultaneously, after the reduction ratio that configures first frame F1, its afer bay F2, F3 ... reduction ratio by the automatic dispensed of system (certainly also can by artificial setting), this is prior art, repeats no more herein.
Behind the sharing of load of adjusting each frame, the load of F3～F6 frame is significantly reduced, but the load of F1 frame obviously raises, and causes the F1 roll-force often to overstep the extreme limit thus, stops phenomenon for avoiding the frame jumping occurring, can be by improving the method for rolling temperature, by improving start rolling temperature and finishing temperature, effectively reduce the roll-force of F1 frame, simultaneously other frame roll-force also there is the reduction effect, the concrete of rolling temperature determine, can be according to following principle:
1, the start rolling temperature raising of can under the prerequisite that heating furnace can be realized, trying one's best, but can get according to test, after start rolling temperature surpasses 1150 ℃, continue rising rolling temperature roll-force and descend not obvious, therefore consider the oil consumption economy, can select start rolling temperature in 1120 ℃ to 1150 ℃ scopes;
2, the selection of finishing temperature mainly is to guarantee the product mechanical property, can select in 885 ℃ to 930 ℃ scopes.
After adopting said method to adjust rolling load and rolling temperature, guaranteed that the F1 frame finishes big as far as possible deflection under situation about normally nip, thereby alleviated the load of follow-up frame: reduce the rolling load of F3, F4 frame, alleviate rolling mill vibration, reduce roll wear, improve strip surface quality; Reduce the rolling load of F5, F6 frame, improve plate shape control ability, guarantee strip shape quality.By taking above-mentioned measure, solved the difficult point that exists during thin format hot rolled steel plate is produced, realized the production in enormous quantities of thin format hot rolled steel plate.
Fig. 1 is on first frame, the schematic diagram when roll and slab interlock;
Fig. 2 is the schematic diagram of used continuous hot-rolling mill when work among the present invention;
Fig. 3 is the flow chart of the method for the invention;
Fig. 4 adopts the inventive method forward and backward, the reduction ratio comparison diagram of each frame;
Description of reference numerals:
1, roll, 2, slab, 3, the roll inlet, 4, the roll outlet.
The specific embodiment
As shown in Figure 3, a kind of production method of thin format hot rolled steel plate, this method comprises the steps:
Distance in a, the adjustment continuous hot-rolling mill between upper and lower two rolls 1 of each frame, and making the reduction ratio ε 1 of first frame is 53% to 63%, wherein, and ε 1=(H1-h1)/H1, H1 is first frame inlet slab thickness, and h1 is first frame outlet slab thickness;
B, the roll inlet 3 that the slab 2 of high temperature is sent into the frame that sets gradually are rolled;
C, slab 2 are after the roll on each frame 1 is rolling, and thin format hot rolled steel plate is from roll outlet 4 outputs.
As shown in Figure 2, after the reduction ratio of first frame F1 was heightened, the load on frame F2 thereafter, F3, F4, F5, the F6 can significantly reduce, and can improve the efficient of the whole operation of rolling, its afer bay load reduces, and the rolling quality of thin format hot rolled steel plate also is improved; For the jumping of avoiding each frame in this continuous hot-rolling mill stops phenomenon, the start rolling temperature of slab 2 is in 1120 ℃ to 1150 ℃ scopes, and finishing temperature is in 885 ℃ to 930 ℃ scopes.
When table 1 is depicted as rolling 1.6mm thickness specification, each frame reduction ratio distribution situation before existing rolling load commonly used is adjusted;
After table 2 is depicted as and adopts the method for the invention, each frame reduction ratio distribution situation after the rolling load adjustment; Adopt the comparison diagram of forward and backward each the frame reduction ratio of the present invention to see Fig. 4; When table 3 is depicted as rolling 1.6mm thickness specification thin format hot rolled steel plate, before and after rolling temperature is adjusted, each frame roll-force range of decrease situation, by this table as seen, after the raising rolling temperature, each frame roll-force is obviously reduced.
Table 1: each frame reduction ratio before rolling load is adjusted
| Frame | F1 | F2 | F3 | F4 | F5 | F6 |
| Frame inlet slab thickness H (mm) | 60 | 30 | 13 | 5.8 | 3.4 | 2.2 |
| Frame outlet slab thickness h (mm) | 30 | 13 | 5.8 | 3.4 | 2.2 | 1.6 |
| Drafts Δ h (mm) | 30 | 17 | 7.2 | 2.4 | 1.2 | 0.6 |
| Reduction ratio ε (%) | 50 | 57 | 55 | 41 | 35 | 27 |
Table 2: each frame reduction ratio after the rolling load adjustment
| Frame | F1 | F2 | F3 | F4 | F5 | F6 |
| Frame inlet slab thickness H (mm) | 60 | 24 | 10 | 4.8 | 3.0 | 2.1 |
| Frame outlet slab thickness h (mm) | 24 | 10 | 4.8 | 3.0 | 2.1 | 1.6 |
| Drafts Δ h (mm) | 36 | 14 | 5.2 | 1.8 | 0.9 | 0.5 |
| Reduction ratio ε (%) | 60 | 58.3 | 52 | 37.5 | 30 | 23.8 |
Table 3: roll-force contrasts before and after adjusting rolling temperature
| Start rolling temperature (℃) | Finishing temperature (℃) | Roll-force (MN) | ||||||
| F1 | F2 | F3 | F4 | F5 | F6 | |||
| Before the adjustment | 1100 | 880 | 33 | 30 | 27 | 17 | 16 | 15 |
| After the adjustment | 1140 | 920 | 29 | 27 | 24 | 15 | 14 | 13 |
| The range of decrease (%) | 12.1 | 10.0 | 11.1 | 11.7 | 12.5 | 13.3 | ||
Claims (3)
1. the production method of a thin format hot rolled steel plate is characterized in that, this method comprises the steps:
Distance in a, the adjustment continuous hot-rolling mill between upper and lower two rolls of each frame, and making the reduction ratio ε 1 of first frame is 53% to 63%, wherein, and ε 1=(H1-h1)/H1, H1 is first frame inlet slab thickness, and h1 is first frame outlet slab thickness;
B, the roll inlet that the slab of high temperature is sent into the frame that sets gradually are rolled;
C, slab are after the roll on each frame is rolling, and thin format hot rolled steel plate is from last breast roller outlet output.
2. the production method of thin format hot rolled steel plate according to claim 1 is characterized in that in above-mentioned b step, the start rolling temperature of described slab is 1120 ℃ to 1150 ℃.
3. as the production method of thin format hot rolled steel plate as described in the claim 2, it is characterized in that in above-mentioned b step, the finishing temperature of slab is 885 ℃ to 930 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100260215A CN101219439A (en) | 2008-01-25 | 2008-01-25 | Method for producing thin format hot rolled steel plate |
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| CNA2008100260215A CN101219439A (en) | 2008-01-25 | 2008-01-25 | Method for producing thin format hot rolled steel plate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033431A (en) * | 2012-12-19 | 2013-04-10 | 南京钢铁股份有限公司 | Method for performing thermal cycle simulation experiment on thin-specification samples on thermal simulation testing machine |
| CN107755431A (en) * | 2017-09-14 | 2018-03-06 | 首钢京唐钢铁联合有限责任公司 | Rolling method of hot-rolled high-strength steel |
| CN114959480A (en) * | 2022-05-31 | 2022-08-30 | 本钢板材股份有限公司 | High-strength hot-rolled coil for 650 MPa-level thin and wide tank and production method thereof |
-
2008
- 2008-01-25 CN CNA2008100260215A patent/CN101219439A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033431A (en) * | 2012-12-19 | 2013-04-10 | 南京钢铁股份有限公司 | Method for performing thermal cycle simulation experiment on thin-specification samples on thermal simulation testing machine |
| CN103033431B (en) * | 2012-12-19 | 2014-11-26 | 南京钢铁股份有限公司 | Method for performing thermal cycle simulation experiment on thin-specification samples on thermal simulation testing machine |
| CN107755431A (en) * | 2017-09-14 | 2018-03-06 | 首钢京唐钢铁联合有限责任公司 | Rolling method of hot-rolled high-strength steel |
| CN114959480A (en) * | 2022-05-31 | 2022-08-30 | 本钢板材股份有限公司 | High-strength hot-rolled coil for 650 MPa-level thin and wide tank and production method thereof |
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