CN112742862B - Production process of large-size narrow-edge H-shaped steel - Google Patents
Production process of large-size narrow-edge H-shaped steel Download PDFInfo
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- CN112742862B CN112742862B CN202011606931.8A CN202011606931A CN112742862B CN 112742862 B CN112742862 B CN 112742862B CN 202011606931 A CN202011606931 A CN 202011606931A CN 112742862 B CN112742862 B CN 112742862B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 33
- 239000010959 steel Substances 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 74
- 238000005096 rolling process Methods 0.000 claims abstract description 74
- 238000000034 method Methods 0.000 claims abstract description 15
- 230000002441 reversible effect Effects 0.000 claims description 12
- 239000013072 incoming material Substances 0.000 claims description 11
- 239000000047 product Substances 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 8
- 238000005452 bending Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
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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
- B21B1/08—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 structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/088—H- or I-sections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
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Abstract
The invention discloses a production process of large-size narrow-edge H-shaped steel, which belongs to the field of steel production and comprises the following steps of special-shaped blank BD rolling, multi-pass continuous rolling and cooling, wherein the production process comprises the following steps: (1) rolling a special-shaped blank BD: expanding waist for rolling; (2) multi-pass continuous rolling: adopting an X-H rolling method; (3) cooling: sectional cooling is adopted; natural cooling is adopted in the first third stage of the total cooling time, and the cooling speed is 12-14 ℃/min; the last two thirds of the total cooling time is cooled by strong wind, and the cooling speed is 25-30 ℃/min. Compared with the prior art, the process can be used for the special-shaped blank with the medium specification, the early-stage operation difficulty and cost are reduced, and high-size precision control can be realized.
Description
Technical Field
The invention relates to a steel production technology, in particular to a production process of large narrow-edge H-shaped steel based on a simulated extension balance method for producing the steel.
Background
The hot-rolled H-shaped steel is an economic section high-efficiency section with more optimized section area distribution and more reasonable strength-weight ratio. Compared with the traditional I-steel, the novel I-steel has the characteristics of good mechanical property and convenience in connection. Compared with the welding of H-shaped steel, the component has accurate size, no deformation and residual stress caused by welding and reduced welding workload. Compared with concrete, the concrete has the advantages of light dead weight, good earthquake resistance and the like. Because each part of the H-shaped steel is arranged at a right angle, the H-shaped steel has the advantages of strong bending resistance, simple construction, cost saving, light structure weight and the like in all directions and is widely applied.
The series of H-shaped steel with over HN700 multiplied by 300 is close to the limit of equipment, the specification width of the series of H-shaped steel reaches 700-900 mm, and the series of H-shaped steel belongs to a narrow flange H-shaped steel product with a larger specification in the standard. Due to the characteristics of large section, large width-to-height ratio and the like, the large-specification narrow-edge H-shaped steel has the following technical difficulties in the production and rolling process: (1) the blank opening machine is used for rolling, the width of a web plate is limited to be expanded towards the width direction through a pass side wall, in order to realize the width of 700-900 mm at the later stage, the BD rolling link needs to calculate the specification of the deformed blank in a backward way according to the specification of a final product, for example, large-specification narrow-edge H-shaped steel with the specification of HN700 multiplied by 300 multiplied by 13 multiplied by 24mm (H multiplied by B multiplied by T, H height, B flange width, T web thickness and T flange 1/4 thickness) is produced, through multiple calculation, special 1024 multiplied by 420 multiplied by 110 multiplied by 105mm deformed blanks need to be prepared, universal 750 multiplied by 370 multiplied by 100 multiplied by 105mm deformed blanks cannot be used, and the operation link and the production difficulty are increased; (2) the web plate has a large area proportion and plays a leading role in rolling deformation, and the extension of the web plate generates an obvious drawing and shrinking effect on a flange, so that size fluctuation is easily caused; (3) when a rolled piece is cooled, the quality problems of wave bending and the like are caused by uneven cooling of the web; (4) the size is large, and the temperature at the straightening inlet can not be reduced; the above problems severely restrict the development of large-scale series.
Disclosure of Invention
The technical task of the invention is to provide a production process of large-specification narrow-edge H-shaped steel aiming at the defects of the prior art, the process can reasonably distribute the rolling reduction of a web plate and a flange by a production section steel simulation extension balancing method, can be used for producing general special-shaped blanks with medium specifications, ensures that the production process of large-specification narrow-edge H-shaped steel is stable in production, is high in size precision control, and achieves the purpose of improving the production and efficiency.
The technical scheme for solving the technical problem is as follows: 1. a production process of large-size narrow-edge H-shaped steel is characterized by comprising the following steps: the production process comprises the steps of rolling the special-shaped blank BD, continuously rolling in multiple passes and cooling, wherein:
(1) Rolling a special-shaped blank BD: the web plate is thinned and widened under high pressure by adopting waist expanding rolling, and the width of the flange is controlled to be increased;
(2) Multi-pass continuous rolling: adopting an X-H rolling method, wherein the arrangement form of a reversible continuous rolling mill group is 5 or 7 times; the reduction coefficient of the flange is the proportional relation of the web reduction coefficients: the initial two passes are 1.04-1.05, the final pass is 1.02-1.03, and the rest amount is arranged in the middle pass;
(3) And (3) cooling: sectional cooling is adopted; natural cooling is adopted in the first third stage of the total cooling time, and the cooling speed is 12-14 ℃/min; the last two thirds of the total cooling time is cooled by strong wind, and the cooling speed is 25-30 ℃/min.
The width of the middle incoming material obtained after the BD rolling is 1.06-1.08 times of the width of the finished product, and the height of the flange of the middle incoming material is 1.2-1.5 times of the height of the finished product; the thickness ratio of the flange of the middle incoming material to the web is 2.2-2.8.
The sectional cooling method comprises the following steps: the rolled piece rotates 90 degrees at the inlet of the cooling bed to be I-shaped, then enters the uniform-speed stepping cooling bed for vertical natural cooling, and is cooled naturally in the cooling bed and is cooled by strong wind when the rolled piece moves to 1/3 of the position.
The web reduction data of the above 5 passes: the deformation of 1-2 passes is 10-15%, the deformation of 3-4 passes is 10-15%, and the deformation of 5 passes is 2-3%.
In the 7-pass rolling, the deformation of the front 4-pass web plates is 6-10%, the deformation of the 5-6-pass web plates is 6-7%, and the deformation of the 7-pass web plates is 2-3%.
Compared with the prior art, the invention has the following outstanding beneficial effects:
1. the special-shaped blank can be universal with a medium specification, the early-stage operation difficulty and cost are reduced, and high-size precision control can be realized;
2. the product surface quality is high, and the quality problems of wave bending and the like caused by uneven cooling in the prior art are solved;
3. the existing process equipment and production technology are fully and effectively utilized, the economic benefit is remarkable, and the popularization value is high.
Drawings
FIG. 1 is a schematic drawing of the waist-expanding rolling of the present invention.
FIG. 2 is a schematic view of prior art reduction rolling.
Fig. 3 is a schematic view of the structure of the reversing tandem mill according to the present invention.
Fig. 4 is a schematic view of the arrangement of the reversing continuous rolling train 5-pass train of the present invention.
Figure 5 is a schematic comparison of prior art and inventive roll fillets.
Detailed Description
The invention is further described with reference to the drawings and the detailed description.
The invention provides a method for manufacturing stable and large narrow-edge H-shaped steel, which can stably produce HN 700X 300, HN 800X 300 and HN 900X 300 series specifications with high dimensional accuracy and meet the requirements of stable product performance and high dimensional accuracy.
The production process comprises the following steps: the special-shaped blank → BD (blank opener) rolling → multi-pass continuous rolling → cooling.
1. Rolling of beam blank BD
The rolling of the special-shaped blank BD adopts a waist expanding rolling process. In the so-called pinch-off rolling, as shown in fig. 1, when the web of the preform is pressed down, the web is freely widened, and the web height (H) of the formed intermediate incoming material 2 is larger than that of the billet 1, so that the billet can be used in common with specifications of 700mm or less, and a preform of 750 × 370 × 100 × 105mm (hxb × T, H height, B flange width, T web thickness, T flange thickness 1/4) is used.
The prior conventional technology is rolling, as shown in fig. 2, a web of a profiled blank is pressed, the transverse expansion of the web is limited by a pass side wall, and the height dimension of the web of the formed middle incoming material 2' is smaller than that of the blank 1. The used profile blank is 1024X 420X 110X 105mm with single specification, and the existing general profile blank can not be used.
In the BD rolling process, the pass system is controlled to adjust the web reduction and the flange reduction to make the web thinner and wider at a high reduction and to control the flange width to increase.
In order to realize that: the width of the middle incoming material obtained after BD rolling is 1.06-1.08 times of the width of the finished product, and the height of the flange of the middle incoming material is 1.2-1.5 times of the height of the finished product. The thickness ratio of the flange of the middle incoming material to the web is 2.2-2.8.
The proportional relation can ensure the balance of the extension of the web and the flange during the subsequent reversible X-H continuous rolling, overcomes the defect of irregular flange shape caused by waist expanding rolling, and plays a role in the regularity of the later flange shape.
2. Multiple pass continuous rolling
The invention adopts an X-H rolling method to realize the balance of the elongation rates of the web and the flange.
Particularly adopt U R EU F Reversible continuous rolling mill train, said U R EU F Ur rolling mill, E rolling mill and U of reversible continuous rolling mill train F The rolling mill is shown in figure 3.
The multiple passes are rolling 5 or 7.
As shown in FIG. 4, U R EU F The arrangement form of the reversible continuous rolling mill group is 5 passes, each pass participates in rough rolling and ensures the surface quality of finished products in finish rolling passes. 5-pass web reduction data: the deformation of 1-2 passes is 10-15%, the deformation of 3-4 passes is 10-15%, and the deformation of 5 passes is 2-3%.
U R EU F The method can also be reversible 7-pass rolling, the deformation of the front 4-pass web is 6-10%, the deformation of 5-6-pass web is 6-7%, and the deformation of 7-pass web is 2-3%, and the dimensional accuracy of the finished product is ensured by adopting multi-pass small-deformation rolling.
In addition, the large-specification narrow-flange H-shaped steel web is wide and occupies a large area proportion, deformation of the web plays a dominant role in subsequent X-H reversible continuous binding, and extension of the web generates an obvious drawing and shrinking effect on the flange. Therefore, the flange and web reduction rules are distributed, namely, the reduction coefficients of the flanges are in a certain proportional relation with the reduction coefficients of the web, the ratio is 1.04-1.05 in the first two passes, and the final pass is 1.02-1.03. The remaining amounts are arranged in intermediate passes, as specified in the table of the example reduction parameters.
The thickness T of the flange is the thickness of one quarter of the flange. And the rolling reduction coefficient is the thickness of the last pass divided by the thickness of the next pass.
By using X-H technique, the X-shaped frame U R The intersection of the roller fillet and the side wall straight line segment is seriously bonded with steel, and the U-shaped frame of the H-shaped frame F The abrasion of the round corners of the roller is quite serious, the rolling reduction of the round corners is relatively large, the metal flow is relatively large, and the round corners are easily abraded.
The invention improves the roller from single round angle (figure 5-a) to double round angle (figure 5-b) to avoid the surface pit problem at the R corner.
The double round corners refer to that two straight line sides of the roller are connected in sequence through two arcs with different radiuses, for example, in the prior art, the two straight line sides of the roller are connected through an arc of R36 in a single round corner, and the two straight line sides of the roller with the double round corners are connected through arcs of R200 and R36. The radian of the X-shaped frame is excessive, so that the arc can be improved R The steel is stuck at the intersection of the straight line sections of the upper wall and the lower wall. And in the H-shaped frame U F And when the radian is different, particularly when the upper radian is greater than the lower radian, the metal flow is not in the middle point of a single impact arc, and the fillet abrasion condition is changed.
In addition, heat preservation treatment is required in the rolling process, such as: and a heat insulation cover is added to prevent the temperature of the web from dropping faster than that of the flange to cause cooling bending.
3. Cooling
In the prior art, a natural cooling method is mostly adopted, and the temperature at a straightening inlet can not be reduced due to large specification, so that the cooling time has to be prolonged, otherwise, the normal production rhythm is influenced.
Some technologies adopt strong air cooling or super cooling technology to cool, but the web plate of the H-shaped steel is too large in area and is cooled faster than a flange, so that the problem of cooling bending is easily caused by the strong cooling mode.
In addition, due to air convection, the upper temperature difference and the lower temperature difference of the H-shaped steel web are different, so that the deformation is more easily aggravated.
Therefore, the technology of the invention adopts the technology of sectional cooling.
The total cooling time is 32-36 min.
The first third stage of the total cooling time adopts natural cooling, and the cooling speed is 12-14 ℃/min.
And the last two thirds of the total cooling time is cooled by strong wind, and the cooling speed is 25-30 ℃/min.
The method specifically comprises the following steps: the rolled piece rotates 90 degrees at the inlet of the cooling bed to be I-shaped, then enters the uniform-speed stepping cooling bed for vertical natural cooling, and is cooled naturally in the cooling bed and is cooled by strong wind when the rolled piece moves to 1/3 of the position.
The cooling bed adopts deep foundation to all be equipped with the air intake at its access & exit, there is the ventilator top, in order to satisfy good air convection cooling effect.
And a strong cooling fan is arranged below the middle and back two thirds parts of the cooling bed, the cooling strength of the strong cooling fan is increased, the cooling rate is increased, the temperature of the rolled piece exiting from the cooling bed is less than 80 ℃, the rolled piece is turned over for 90 degrees at the outlet of the cooling bed again after being cooled, the rolled piece is restored to an H shape, and the problem of web cooling waves is effectively solved through the above cooling means.
For better description, the rolling process will be described by taking the HN 700X 300X 13X 24mm (H X B X T X T) specification as an example.
Practice proves that: when the blank with the thickness of 750 multiplied by 370 multiplied by 100 multiplied by 105mm is used for traditional reduction rolling, the flange B of the middle blank cannot be increased, reasonable extension cannot be realized in the continuous rolling stage, and the specification of HN700 multiplied by 300 multiplied by 13 multiplied by 24mm cannot be produced.
Comparative example
The prior art is adopted, namely the beam blank → BD rolling → multi-pass reversible continuous rolling → cooling.
1. Rolling of beam blank BD
Comparative example a specific stock of 1024X 420X 110X 105mm gauge was rolled down. The dimensions of the resulting intermediate charge were 850X 322X 47X 107mm.
2. Multiple pass reversible continuous rolling
By X-H rolling with U R EU F The data of the reversing continuous rolling unit, 5 passes and the web reduction are shown in a table of continuous rolling parameters of the embodiment.
3. Cooling
Naturally cooling in the whole process at the cooling speed of 12-14 ℃/min.
Group of examples
The production process of each embodiment group comprises the following steps: the special-shaped blank → BD expanding rolling → multi-pass reversible continuous rolling → combined cooling. The dimensions of the blank used in each example are 750X 370X 100X 105mm.
1. BD waist expanding rolling of special-shaped blank
The specifications of the final intermediate stock are given in the following table:
2. multiple pass reversible continuous rolling
By X-H rolling, using U R EU F The specific pass reduction schedule for the reversing tandem mill train is shown in the following table.
3. Combined cooling
The results of the comparison of the control and the examples are shown in the following table:
from the above results, it can be seen that the narrow-edge H-shaped steel with HN 700X 300X 13X 24 specification manufactured by the process of the present invention has the size capable of meeting the size requirement of the finished product, the surface quality of the product is high, the wave bending occurrence is obviously reduced compared with the comparative example, in addition, the double circular arcs at the R corners effectively reduce the generation of pits, and the shortage of the X-H technology is improved. The comparative examples using the prior art production method had to be implemented using separate blanks, and could not share blanks with the HN600 × 300, HN600 × 200, and HN650 × 300 series.
It should be noted that while the invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various obvious changes can be made therein without departing from the spirit and scope of the invention.
Claims (3)
1. A production process of large-size narrow-edge H-shaped steel is characterized by comprising the following steps: the production process comprises the steps of rolling the special-shaped blank BD, continuously rolling in multiple passes and cooling, wherein:
(1) Rolling a special-shaped blank BD: a special-shaped blank with the height of 750 times the width of the flange of 370 times the thickness of the web of 100 times the thickness of 105mm at the position of 1/4 of the flange is used, and the web is thinned and widened under high pressure by adopting waist expanding rolling to control the width increase of the flange;
(2) Multi-pass continuous rolling: by X-H rolling, by U R EU F The arrangement form of the reversible continuous rolling unit is 5 or 7 passes; the reduction coefficient of the flange and the reduction coefficient of the web have a proportional relation: the initial two passes are 1.04-1.05, the final pass is 1.02 to 1.03, and the rest is arranged in the middle pass; the 5-pass web reduction data: the deformation of 1 to 2 passes is 10 to 15 percent, the deformation of 3 to 4 passes is 10 to 15 percent, and the deformation of 5 passes is 2 to 3 percent; according to the rolling reduction data of the web plate in 7 passes, the deformation of the web plate in the first 4 passes is 6-10%, the deformation of the web plate in the 5-6 passes is 6-7%, and the deformation of the web plate in the 7 passes is 2-3%;
(3) And (3) cooling: sectional cooling is adopted; the total cooling time is 32 to 36 min; the first third stage of the total cooling time adopts natural cooling, and the cooling speed is 12 to 14 ℃/min; and cooling by strong wind in the last two thirds of the total cooling time at the cooling speed of 25 to 30 ℃/min.
2. The process of producing large format narrow edge H-section steel of claim 1, wherein: the width of the middle incoming material obtained after the BD rolling is 1.06 to 1.08 times of the width of a finished product, and the height of the flange of the middle incoming material is 1.2 to 1.5 times of the height of the finished product; the thickness ratio of the flange of the middle incoming material to the web is 2.2 to 2.8.
3. The process of producing large format narrow edge H-section steel of claim 1, wherein: the sectional cooling method comprises the following steps: the rolled piece rotates 90 degrees at the inlet of the cooling bed to be I-shaped, then enters the uniform-speed stepping cooling bed for vertical natural cooling, and is cooled naturally in the cooling bed and is cooled by strong wind when the rolled piece moves to 1/3 of the position.
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| CN202011606931.8A CN112742862B (en) | 2020-12-30 | 2020-12-30 | Production process of large-size narrow-edge H-shaped steel |
| CN202211195920.4A CN115532820A (en) | 2020-12-30 | 2020-12-30 | Method for producing large-specification H-shaped steel by using medium-specification special-shaped blank |
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Denomination of invention: Production process of a large-sized narrow edge H-shaped steel Effective date of registration: 20231215 Granted publication date: 20221011 Pledgee: Rizhao Bank Co.,Ltd. Pledgor: RIZHAO STEEL HOLDING GROUP Co.,Ltd. Registration number: Y2023980072204 |