CN108941196B - Method for continuously rolling small-specification bar by using 200 large-section square billet - Google Patents
Method for continuously rolling small-specification bar by using 200 large-section square billet Download PDFInfo
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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
- B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
Abstract
The invention discloses a method for continuously rolling a small-specification bar by using a 200-mm large-section square billet, which comprises the heating step of heating the 200-mm large-section square billet to 1100 ℃ and carrying out soaking and heat preservation; a step of removing the head and roughly rolling, which is to sequentially send the heat-insulated square billet with the large section of 200mm multiplied by 200mm into a 1# rough rolling mill and a 2# rough rolling mill which are horizontally and vertically alternately arranged to carry out removing the head and roughly rolling, so as to obtain a 165mm multiplied by 162mm square billet; a middle finish rolling step of enabling a 165mm x 162mm square billet to enter a 3# rough rolling mill through a head-off roller way, and rolling the square billet through a 6-pass horizontally-vertically-alternately-arranged rough rolling mill, an 8-12-pass middle rolling mill and a finish rolling mill to obtain a phi 16-phi 40mm small-specification bar; and shearing and cooling the small-specification bar material by utilizing a flying shear to perform multiple length segmentation and cooling after the rolling is finished to obtain a small-specification finished bar material. The invention has the characteristics of high operation rate, stable rolling, low rolling loss and higher yield.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to a method for continuously rolling a small-size bar by using a 200 large-section square billet, which has high operation rate, stable rolling, low rolling loss and higher yield.
Background
Steel materials with their properties, high strength and toughness, easy formability, green recyclability will be important structural materials in the future. The small-sized bar materials are the most consumed steel products in China, the current wire bar materials account for about 50% of the total output of steel, and the output of the small-sized bar materials accounts for about 25% of the total output of the steel products. With the development of automobile manufacturing, electrical machinery and ship manufacturing industries, the proportion of plates and pipes in steel materials is gradually increased, the proportion of wire and rod materials is reduced, but the absolute value of the wire and rod materials is still increased.
The small-size bar is obtained by rolling a large-section square billet for multiple times, but in the prior art, due to the limitation of the scale, the number and the technology of rolling mills, the rolling of the large-section square billet into the small-size bar can be finished only by two-fire rolling, so that the heating energy consumption is high, and the metal yield is low. At present, one-step rolling is a widely adopted process, but the section of a blank of a conventional bar product mainly has several sections of 150mm × 150mm, 165mm × 165mm and 170mm × 170mm, and the blank of a large section above 200 is rolled into a conventional specification bar, and the blank of the large section is longitudinally divided into two or more small-section blanks by using a roller or other equipment through a slitting rolling process, so that the elongation coefficient is reduced to 1/2, 1/3 or 1/4, although the elongation coefficient can be reduced, the specification and the variety of billets can be reduced, the problems of high energy consumption, low metal yield, frequent equipment impact and high shutdown operation rate also exist. Due to the limitation of equipment and process, the rolling of the current 200mm × 200mm large-section blank is mainly used for rolling large rod or section products with the diameter of over 60mm, is rarely used for rolling small-specification products, and is not basically used for rolling small-specification products particularly for the single heavy blank with the diameter of 200mm × 200mm × 9 m-12 m. In the prior art, a long process is generally adopted to overcome the problem that the total elongation coefficient from a large-section blank to a small-section bar is large when the small-section bar is rolled by a large-section blank of 200mm multiplied by 200mm, but the overlong process can cause long rolling time, the temperature difference between the head and the tail of a rolled piece in front and rear rolling mills is large, a heat-insulating cover or a secondary heating mode needs to be additionally arranged to solve the temperature drop problem, the additional arrangement of the heat-insulating cover causes large investment and difficult maintenance and replacement, and the secondary heating can cause old problems of high heating energy consumption and low metal yield. In addition, the long-flow pass system adopted in the prior art is difficult to share with the sections of 150mm × 150mm, 165mm × 165mm, 170mm × 170mm and the like, so that the pass is complex, the types of transition passes are excessive, the production cost is high, the types of spare parts such as rollers, guide and guard devices and the like are various, the occupied amount is large, the consumption is large, the occupied funds are large, the labor intensity of workers is high, the management and the operation are difficult, and the confusion is easy to cause; and the roller changing amount is large and the roller changing time is long when the variety is changed, so that the production operation rate is low, the flexibility of product variety changing is influenced, the adaptability of production and market is poor, and the advantage of high continuous rolling capacity of the large section is seriously restrained.
Disclosure of Invention
In order to solve the defects, the invention aims to provide a method for continuously rolling small-specification bars by 200 large-section square billets, which has high operating rate, stable rolling, low rolling loss and higher yield.
The purpose of the invention is realized as follows: the method comprises the steps of heating, head-off rough rolling, medium finish rolling and shearing cooling, and comprises the following specific steps:
A. heating: heating a large-section square billet with the diameter of 200mm multiplied by 200mm to 1100 ℃, and carrying out soaking and heat preservation;
B. removing heads and rough rolling: sequentially feeding the heat-insulated 200mm multiplied by 200mm large-section square billets into a 1# rough rolling mill and a 2# rough rolling mill which are arranged horizontally and vertically in an alternating manner for head-off rough rolling to obtain 165mm multiplied by 162mm square billets;
C. and (3) medium finish rolling: feeding a 165mm x 162mm square billet into a 3# rough rolling mill through a head-off roller way, and rolling the square billet through 6-pass horizontally-vertically-alternately arranged rough rolling mill, 8-12-pass middle rolling mill and finish rolling mill to obtain a phi 16-phi 40mm small-specification bar;
D. shearing and cooling: and after the small-specification bar is rolled, performing multiple length segmentation and cooling by using a flying shear to obtain a small-specification finished bar.
Compared with the prior art, the invention has the following beneficial effects:
1. in order to solve the problem of long process of rolling small-specification bars by large-section square billets in the prior art, the invention carries out end-off rough rolling by a 1# rough rolling mill and a 2# rough rolling mill, and other rough rolling mills and a middle finishing mill carry out reasonable distribution of extension coefficients and optimization design of hole patterns, so that the 200mm x 200mm large-section square billets can be used for rolling the small-specification bars with phi 16-phi 40mm only by 16-20 passes, thereby simplifying the rolling process, reducing the rolling passes and reducing the production cost;
2. in order to overcome the problem of excessive transition hole type in the prior art, the invention carries out head-removing rough rolling by a 1# rough rolling mill and a 2# rough rolling mill, thereby realizing that a 200mm multiplied by 200mm large-section square billet behind a 3# rolling mill shares a hole type system of the square billet with 150mm multiplied by 150mm and 165mm multiplied by 165mm, reducing the types of spare parts such as a roller, a guide device and the like, avoiding frequent replacement of the hole type of the rolling mill when rolling different large-section square billets, and improving the production operation efficiency;
3. aiming at the problems that the 1# and 2# are subjected to head-off rolling when a 200mm multiplied by 200mm square billet is rolled, the section of the billet is large, a rolled piece is long, the rolling time is long, the temperature difference between the head and the tail of the rolled piece entering a subsequent rolling mill group is large, and heat preservation measures or secondary heating are required in the prior art, the invention can ensure the starting temperature of the square billet entering the 3# rolling mill by controlling the speed of a conveying ground roller and the speeds of the 1# and 2# rough rolling mills, and the rolling mills after the 1# and 2# rough rolling mills are closely arranged, so that the gap time is short, the temperature drop of the rolled piece is small, the one-shot rolling can be realized, the heating energy consumption is reduced, and the metal;
4. the whole-line rolling mills are arranged horizontally and vertically alternately, so that continuous and torsion-free rolling of bars can be realized, each rolling mill can be driven independently or collectively, each rolling mill only rolls one pass, the rolling speed is high, and the yield is high; because the length of the rolled piece is not limited by the space between the frames during continuous non-twist rolling, the invention can be used for rolling bars with different specifications by various large-section and heavy billets with the diameters of 150 multiplied by 12000mm, 165 multiplied by 12000mm, 200 multiplied by 12000mm, 230 multiplied by 9000mm and the like on the premise of ensuring that the temperature difference between the head and the tail of the rolled piece does not exceed an allowable value, thereby improving the yield of a rolling mill and the metal yield;
5. under the condition of ensuring the yield, compared with the widely adopted splitting rolling process in the prior art, the number of strips rolled for rolling the large-section square billet with the size of 200mm multiplied by 200mm per hour is reduced, so that the impact frequency caused to a rolling mill and accessory equipment thereof is greatly reduced, mechanical accidents, electrical accidents and rolling accidents in the process of rolling 200 squares are well controlled, the shutdown operation rate is reduced, and the index is improved.
Therefore, the invention has the characteristics of high operation rate, stable rolling, low rolling loss and higher yield.
Detailed Description
The present invention is further illustrated but not limited in any way by the following description, and any alterations or substitutions based on the teachings of the present invention are intended to fall within the scope of the present invention.
The invention comprises the steps of heating, head-off rough rolling, medium finish rolling and shearing cooling, and the specific steps are as follows:
A. heating: heating a large-section square billet with the diameter of 200mm multiplied by 200mm to 1100 ℃, and carrying out soaking and heat preservation;
B. removing heads and rough rolling: sequentially feeding the heat-insulated 200mm multiplied by 200mm large-section square billets into a 1# rough rolling mill and a 2# rough rolling mill which are arranged horizontally and vertically in an alternating manner for head-off rough rolling to obtain 165mm multiplied by 162mm square billets;
C. and (3) medium finish rolling: feeding a 165mm x 162mm square billet into a 3# rough rolling mill through a head-off roller way, and rolling the square billet through 6-pass horizontally-vertically-alternately arranged rough rolling mill, 8-12-pass middle rolling mill and finish rolling mill to obtain a phi 16-phi 40mm small-specification bar;
D. shearing and cooling: and after the small-specification bar is rolled, performing multiple length segmentation and cooling by using a flying shear to obtain a small-specification finished bar.
And in the step B, after the 200mm multiplied by 200mm large-section square billet is discharged from the furnace, controlling the conveying ground roller, the 1# rough rolling mill and the 2# rough rolling mill to accelerate rolling, after the head of the 165mm multiplied by 162mm square billet subjected to head removal rough rolling enters the 3# rough rolling mill, controlling the conveying ground roller, the 1# rough rolling mill and the 2# rough rolling mill to decelerate to a normal rolling speed, and enabling the temperature of the square billet entering the 3# rough rolling mill to be 950 +/-10 ℃.
The normal rolling speeds of the 1# rough rolling mill and the 2# rough rolling mill are 0.31m/s and 0.37m/s respectively.
And in the step B, the caliber of the 1# rough rolling mill is a flat box type with the height of 150mm and the width of a rolled piece of 215mm, the caliber of the 2# rough rolling mill is a vertical box type with the height of 165mm and the width of the rolled piece of 165mm, and the 1# rough rolling mill and/or the 2# rough rolling mill is a phi 750 mill.
The step C comprises 3# to 8# horizontal and vertical alternative roughing mills, and the pass change sequence of the 3# to 8# roughing mills is as follows: flat box hole pattern → vertical box hole pattern → oval hole pattern → round hole pattern.
The pass of the 3# roughing mill is a flat box type with the height of 120mm and the width of a rolled piece of 180mm, the pass of the 4# roughing mill is a vertical box type with the height of 136mm and the width of the rolled piece of 137mm, the pass of the 5# roughing mill is an oval type with the height of 100mm and the width of the rolled piece of 162mm, the pass of the 6# roughing mill is a circular type with the height of 110mm and the width of the rolled piece of 110mm, the pass of the 7# roughing mill is an oval type with the height of 75mm and the width of the rolled piece of 126mm, and the pass of the 8# roughing mill is a circular pass with the height of 86mm and the width of the rolled piece of 86 mm.
The 3# rough rolling mill and/or the 4# rough rolling mill in the step C are phi 750 mills or phi 650 mills, the 5# to 8# rough rolling mills are phi 650 mills, the middle rolling mill in the step C is a phi 500 mill and/or a phi 475 mill, and the finish rolling mill is a phi 420 mill and/or a phi 350 mill.
The rough rolling mill, the middle rolling mill and the finish rolling mill are short-stress rolling mills, the 1-11 # rolling mill is current memory micro-tension rolling, and the rest of the middle rolling mill and the finish rolling mill are vertical loop controlled tension-free rolling.
C, rolling by a middle rolling mill and a finish rolling mill for 8-10 times to obtain a small-specification bar with phi 16-phi 25 mm; and rolling by a middle rolling mill and a finish rolling mill for 10-12 passes to obtain a small-specification bar with phi 26-phi 40 mm.
And B, heating the 200mm multiplied by 200mm large-section square billet in the step A by a full beam walking-beam heating furnace, a side-in side-out beam bottom walking-beam heating furnace, a side-in side-out steel-pushing heating furnace, a single-row charging side-in side-out heating furnace or a three-section continuous steel-pushing heating furnace, and carrying out soaking and heat preservation.
Example 1
Taking a 200X 12000mm large-section square billet rolled bar with the diameter of 25mm as an example, the method comprises the following specific steps:
1. a large-section square billet with the diameter of 200mm multiplied by 12000mm is heated to 1100 ℃ through a steel pushing type heating furnace with the end-in and side-out cold billet heating capacity of 180t/h and is soaked and insulated;
1.1 checking the furnace bottom strength
The furnace bottom strength calculation formula is as follows: p = G/S (wherein: P: hearth bottom strength [ kg/(m))2.h)](ii) a G: furnace output, kg/h; s is the effective area m of the furnace2) The furnace bottom strength at 200 square rolling satisfies 200mm × 200mm × 12000 mm.
1.2 checking the Water Beam Strength
Wyq < Wsj (wherein: Wsj is the section coefficient of the water beam), meets the process requirements through checking the strength,
the flexibility fmax is less than 0.002, which meets the requirement.
1.3 checking the heating time
Calculating the heating time of the 230 square billet rolled according to the formula of F and Heiss: τ = KS/(1.24-S),
in the formula: tau-heating time h, K-coefficient, K =13.9, S-billet thickness (m),
and calculating to obtain: heating time τ =2.6(h),
actual heating time of rolled 200 blanks: t =145/40=3.6 (h),
τ =2.6(h) <3.6(h), and the heating time of the check rolled 200 billet is satisfied.
1.4, determining rolling pass
The determination of the rolling pass is carried out by pass calculation according to the finished product with the diameter of phi 25mm,
area of billet F0=200 mm × 200mm =40000mm2，
Phi 25mm finished product cross-sectional area Fn =490.9mm2，
The total coefficient of extension mu 0= F0/Fn =40000/490.9=81.48,
average extension coefficient (given μ n = 1.279),
rolling pass n = ㏑ 81.48.48/㏑ 1.279=17.88, taking n = 18.
2. The 1# and 2# short stress rough rolling mills with phi 750 are arranged horizontally and alternately, after a 200mm multiplied by 200mm large-section square billet is discharged from a furnace, the conveying ground rolls and the 1# and 2# rough rolling mills (the rolling parameters are shown in table 1) are controlled to respectively accelerate the end-removing rough rolling, after the head of the 165mm multiplied by 162mm square billet after the end-removing rough rolling enters the 3# rough rolling mill, the conveying ground rolls, the 1# rough rolling mill and the 2# rough rolling mill are controlled to decelerate to the normal rolling speeds of 0.31m/s and 0.37m/s respectively for the end-removing rough rolling, the temperature of the square billet entering the 3# rough rolling mill is enabled to be 950 +/-10 ℃, and the 165mm multiplied by 162mm square billet is obtained.
3. The method comprises the following steps of (1) enabling a square billet of 165mm multiplied by 162mm to enter a 3# rough rolling mill through a head-off roller way, and sequentially changing through 6 passes of hole patterns: the method comprises the steps of (1) carrying out short stress rough rolling on a flat box hole pattern → a vertical box hole pattern → an oval hole pattern → a round hole pattern → a short stress rough rolling mill which is alternately arranged in a horizontal and vertical mode (the specification of the rolling mill is phi 750 multiplied by 2+ phi 650 multiplied by 4, the rolling parameters are shown in a table 1), then carrying out rolling on the short stress medium finishing rolling mill for 10 times (the specification of the rolling mill is phi 475 multiplied by 6+ phi 350 multiplied by 4), obtaining a small-specification bar with the phi of 25mm, and controlling the tail removing temperature of the bar at.
4. After the small-specification bar is rolled, the flying shears are used for carrying out multiple length segmentation and cooling to obtain a small-specification finished bar with the fixed length of 6-12 m.
TABLE 1 Rolling schedule
5. Yield and rolling mill hour yield analysis:
and (3) rolling 9874.090 tons of 200 square billets in batch according to the process layout, wherein the rolling specification is phi 25 mm.
TABLE 2 rolled Metal success Rate
From the above table 2 rolling 200 side yield statistics: the theoretical yield index is 100.25%, and the yield index is improved by 0.27% compared with the yield index of 99.98% of 165/150, which is mainly that the rolling mill for 200 is high in operation rate, stable in rolling, low in rolling loss and high in yield index, and the number of times of shearing the head and the tail of the shear is reduced. Therefore, the larger the section of the blank is, the more helpful the control of the workshop yield index is. Meanwhile, the yield of a 200-square rolling mill is 162.27 tons/hour which is higher than that of 165/150 (the yield of a 165-square rolling mill is 154.69 tons/hour, and the yield of a 150-square rolling mill is 153.84 tons/hour).
6. Energy consumption comparison:
TABLE 3 energy consumption COMPARATIVE TABLE
As can be seen from table 3: the blast furnace gas and the power consumption of the 200-side rolling are both higher than those of the 150/165-side rolling. The section of the blank with the 200 square is larger than that of the blank with the 150/165 square, the heating time and the energy consumption are higher, wherein the higher power consumption is mainly to increase 2 rolling mills, and the energy consumption is higher than that of 150/165.
The measurement after the yield indexes of the table 2 are combined shows that: the cost of rolling 200 square tons of steel is reduced by 18.96 yuan/ton compared with that of rolling 150/165 square.
Claims (5)
1. A method for continuously rolling small-specification bars by using 200 large-section square billets is characterized in that the square billets are steel square billets and comprise the steps of heating, head-off rough rolling, medium and fine rolling and shearing cooling, and the method comprises the following specific steps:
A. heating: heating a large-section square billet with the diameter of 200mm multiplied by 200mm to 1100 ℃, and carrying out soaking and heat preservation;
B. removing heads and rough rolling: discharging the heat-insulated 200mm x 200mm large-section square billet out of the furnace, sequentially feeding the square billet into a 1# rough rolling mill and a 2# rough rolling mill which are horizontally and vertically alternately arranged, and controlling a conveying ground roller, the 1# rough rolling mill and the 2# rough rolling mill to accelerate end-off rough rolling to obtain a 165mm x 162mm square billet; after the head of a 165mm square billet subjected to head-removing rough rolling enters a 3# rough rolling mill, controlling a ground conveying roller, the 1# rough rolling mill and a 2# rough rolling mill to decelerate to normal rolling speeds of 0.31m/s and 0.37m/s respectively, so that the temperature of the square billet entering the 3# rough rolling mill is 950 +/-10 ℃; the caliber of the 1# rough rolling mill is a flat box type with the height of 150mm and the width of a rolled piece of 215mm, the caliber of the 2# rough rolling mill is a vertical box type with the height of 165mm and the width of the rolled piece of 165mm, and the 1# rough rolling mill and/or the 2# rough rolling mill are phi 750 mills;
C. rough rolling and medium finish rolling: feeding a 165mm x 162mm square billet into a 3# rough rolling mill through a head-off roller way, and rolling the square billet through 6-pass horizontally-vertically-alternately arranged rough rolling mill, 8-12-pass middle rolling mill and finish rolling mill to obtain a phi 16-phi 40mm small-specification bar; the method comprises a 3# to 8# rough rolling mill which is horizontally and vertically arranged in an alternating mode, wherein the pass change sequence of the 3# to 8# rough rolling mill is flat box pass → vertical box pass → oval pass → round pass in sequence; the pass of the 3# roughing mill is a flat box type with the height of 120mm and the width of a rolled piece of 180mm, the pass of the 4# roughing mill is a vertical box type with the height of 136mm and the width of the rolled piece of 137mm, the pass of the 5# roughing mill is an oval type with the height of 100mm and the width of the rolled piece of 162mm, the pass of the 6# roughing mill is a circular type with the height of 110mm and the width of the rolled piece of 110mm, the pass of the 7# roughing mill is an oval type with the height of 75mm and the width of the rolled piece of 126mm, and the pass of the 8# roughing mill is a circular pass with the height of 86mm and;
D. shearing and cooling: and after the small-specification bar is rolled, performing multiple length segmentation and cooling by using a flying shear to obtain a small-specification finished bar.
2. The method according to claim 1, wherein the 3# roughing mill and/or the 4# roughing mill in the step C is a Φ 750 mill or a Φ 650 mill, the 5# to 8# roughing mill is a Φ 650 mill, the intermediate rolling mill in the step C is a Φ 500 mill and/or a Φ 475 mill, and the finishing mill is a Φ 420 mill and/or a Φ 350 mill.
3. The method according to claim 1, wherein the roughing mill, the intermediate mill and the finishing mill are short stress mills, 1-11 # mills are current memory micro tension mills and the remaining intermediate mill and finishing mill are loop controlled tension-free mills.
4. The method according to claim 1, wherein the C step is carried out by 8-10 passes of middle rolling mill and finish rolling mill to obtain a small-size bar stock with phi 16-phi 25 mm; and rolling by a middle rolling mill and a finish rolling mill for 10-12 passes to obtain a small-specification bar with phi 26-phi 40 mm.
5. The method according to claim 1, wherein the 200mm x 200mm large-section billet in step a is heated and heat-preserved by a full beam walking beam furnace, a side-in side-out beam bottom walking beam furnace, a side-in side-out pusher furnace, a single-row charging side-in side-out furnace or a three-stage continuous pusher furnace.
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| CN112296085A (en) * | 2020-08-14 | 2021-02-02 | 陕钢集团汉中钢铁有限责任公司 | Rough rolling type system for rolling 165 square billets |
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