CN117324401A - Method for effectively controlling surface pattern defects of wind power steel plate - Google Patents
Method for effectively controlling surface pattern defects of wind power steel plate Download PDFInfo
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- CN117324401A CN117324401A CN202311204986.XA CN202311204986A CN117324401A CN 117324401 A CN117324401 A CN 117324401A CN 202311204986 A CN202311204986 A CN 202311204986A CN 117324401 A CN117324401 A CN 117324401A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 50
- 239000010959 steel Substances 0.000 title claims abstract description 50
- 230000007547 defect Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005096 rolling process Methods 0.000 claims abstract description 66
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000005266 casting Methods 0.000 claims description 12
- 238000002791 soaking Methods 0.000 claims description 4
- 239000000446 fuel Substances 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 21
- 238000004519 manufacturing process Methods 0.000 abstract description 20
- 229910052742 iron Inorganic materials 0.000 abstract description 9
- 238000009749 continuous casting Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 229910004283 SiO 4 Inorganic materials 0.000 description 4
- 229910000851 Alloy steel Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 229910005347 FeSi Inorganic materials 0.000 description 1
- 229910017028 MnSi Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- 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
- B21B45/004—Heating the product
-
- 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
- B21B45/04—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 de-scaling, e.g. by brushing
- B21B45/08—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 de-scaling, e.g. by brushing hydraulically
-
- 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
- B21B45/004—Heating the product
- B21B2045/006—Heating the product in vacuum or in inert atmosphere
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to a method for effectively controlling pattern defects on the surface of a wind power steel plate, and belongs to the technical field of steel plate metallurgy. On the basis of the existing production process, the production process optimization is carried out simultaneously in the continuous casting billet heating and rolling process to realize the effective control of the pattern defects on the surface of the steel plate, and the core technology is developed around three aspects: (1) Controlling the atmosphere in the heating furnace, adopting a low-temperature heating process technology, and reducing the generation of primary oxide scales; (2) The residence time and the waiting temperature time in the rolling process are shortened, and the secondary oxidation degree of the surface of the steel plate is reduced; (3) And high-pressure water dephosphorization is enhanced, dephosphorization passes are reasonably distributed, and iron scales are effectively removed. The proportion of pitting defects on the surface of the steel plate produced by adopting the technical scheme of the invention can be stably controlled within 1 percent.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a method for effectively controlling surface pattern defects of a low-alloy steel plate.
Background
In the production process of the hot rolled steel plate, the iron scale on the surface of the steel plate cannot be effectively removed, the steel plate is pressed into the surface of the steel plate by a rolling mill, and finally, pattern-shaped secondary iron scale defects, which are called pattern defects for short, are formed and are generally distributed at the head part or the tail part of the steel plate and at the middle part, and the appearance of the pattern defects is shown in the figure 1. The steel plate with the pattern defects is manufactured into a wind power tower barrel, obvious color difference can occur after shot blasting treatment, the painting is obvious, and the attractiveness is seriously affected. For tower steel plates with pattern defects, current wind tower manufacturers adopt a welding repair mode to treat in the black tower manufacturing stage, so that the manufacturing cost is increased, the production period is delayed, and quality complaints and claims are frequently presented to the steel plate manufacturers. In recent years, domestic medium plate factories begin to pay attention to steel plate surface quality control and obtain a certain effect, but no effective solution is found for the surface pattern defect of the steel plate for wind power, so that the repairing and judging amount is high, the economic benefit of enterprises is greatly influenced, and contract delivery is seriously influenced.
The prior art related to the iron scale which can be searched at present is almost aimed at the pit defect on the surface of the steel plate, and the prior art about the surface pattern defect control is rarely reported.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for effectively controlling the surface pattern defects of the low alloy steel plate aiming at the prior art, and the proportion of pitted surface defects on the surface of the steel plate produced by adopting the technical scheme of the invention can be stably controlled within 1 percent.
On the basis of theoretical guidance, the invention summarizes a set of control method for effectively controlling the pitting surface on the surface of the steel plate for wind power from production practice by reasonably designing chemical components, innovating a slab heating process and a rolling process and optimizing dephosphorization pass distribution.
The technical scheme adopted by the invention is as follows: a method for effectively controlling pattern defects on the surface of a wind power steel plate comprises
And (3) casting blank heating control: the casting blank is fed into the furnace at the temperature ranging from 500 ℃ to 600 ℃, the total furnace time is 120 min to 150min, the temperature of the second heating section is 1130 ℃ to 1190 ℃, the temperature of the soaking section is 1150 ℃ to 1190 ℃, the total heating time of the second heating section and the soaking section is more than or equal to 40min, and the weak oxidizing atmosphere is controlled in the furnace;
and (3) casting blank rolling control: rolling by adopting a single-frame steckel mill, wherein the rolling comprises two stages of rough rolling and finish rolling, a slab is subjected to descaling by high-pressure water after being discharged from a heating furnace, then a billet is conveyed to a rolling mill, the rough rolling starting temperature is more than or equal to 1050 ℃, and a plurality of rolling passes in the rough rolling stage are subjected to descaling by adopting rolling mill frame descaling water; and in the finish rolling stage, a plurality of rolling passes are performed, except the last rolling pass, all other rolling passes are performed by adopting mill frame descaling water, the thickness of the intermediate blank to be heated is 1.8-2.2H, H is the thickness of a finished steel plate, and the initial rolling temperature in the finish rolling stage is controlled to be 920+/-20 ℃.
As one of preferable modes of the present application, in the cast slab heating stage, the air-fuel ratio in the heating furnace is less than 0.7.
As one of preferable modes of the present application, in the casting blank rolling stage, the water pressure at the time of descaling is 21MPa, and the roller speed is 0.8 m/s.
As one of the preferable modes of the present application, the casting blank rolling stage has 4 rolling passes in the rough rolling stage and 5 rolling passes in the finish rolling stage.
As one of the preferable modes of the application, the Si in the steel plate element components is controlled to be 0.25-0.50% by weight percent, and Nb is less than or equal to 0.005% by weight percent.
The key technological parameters adopted by the technical scheme of the invention are set according to production practice, the overall design thought is to reduce oxidation of the steel billet in the heating and rolling processes as far as possible on the premise of ensuring the production smoothness and the quality performance of the steel plate, and meanwhile, the iron scale remained on the surface of the steel plate is removed by strengthening high-pressure water dephosphorization operation, which is specifically described as follows:
(1) In the invention, the air-fuel ratio of a heating furnace is preferably controlled to be less than or equal to 0.7 in the blank heating process, and the aim is to keep the furnace in a weak oxidizing atmosphere; the hot feeding and hot charging process and the low-temperature heating process are adopted, so that the blank charging temperature is improved as much as possible on the premise of not generating red feeding cracks, the residence time of the blank in the furnace is reduced, the primary oxide scale generated in the heating process of the blank is further reduced, and the adverse effect of high Si component design on the surface quality of the steel plate can be effectively avoided by adopting the low-temperature heating. On the other hand, studies have shown that: when the mass fraction of Si is more than 0.2%, the FeO and the liquid Fe in an equilibrium state are easy to form after the slab temperature reaches more than 1220 DEG C 2 SiO 4 . Liquid Fe 2 SiO 4 Surrounding FeO crystal grains to form FeO/Fe 2 SiO 4 Is a eutectoid product of (a); when the temperature is reduced to 1170 ℃ or lower, fe 2 SiO 4 The solidification starts and forms an anchor-like morphology, and the surrounding FeO layer is pinned, so that the FeO layer is difficult to completely remove under the impact of high-pressure descaling water. The upper limit of the heating temperature of the slab is controlled below 1200 ℃, so that the Si content can be controlled in a higher range, namely 0.25-0.50%, the invention is beneficial to tissue steelmaking production, and the alloy can be added by adding MnSi to replace low Mn and FeSi, thereby achieving the aim of reducing the alloy cost. Nb is controlled to be less than or equal to 0.005%, and a series of quality problems caused by that Nb cannot be completely melted into austenite due to a low-temperature short-time heating process are effectively avoided.
(2) The initial rolling temperature of rough rolling is set to be equal to or higher than 1050 ℃, the thickness of an intermediate billet to be warmed is set to be 1.8-2.2H (H is the thickness of a finished steel plate), and the initial rolling temperature of a finish rolling stage is controlled to be 920+/-20 ℃, so that the purposes of properly reducing the initial rolling temperature of rough rolling and the thickness of the intermediate billet and improving the rolling control temperature can be achieved, the quick connection of three links of billet tapping, rough rolling and finish rolling can be realized, the isothermal time of the billet in the whole rolling process after the billet is tapped is shortened, the secondary oxidized iron scale is reduced on the surface of the steel plate, and the pattern defects on the surface of the steel plate are effectively controlled.
(3) The slab is descaled by high-pressure water after being discharged from the heating furnace, the water pressure is more than or equal to 21Mpa during the descaling, the roller speed is 0.8 m/s, and the rest rolling passes except the last rolling pass in the whole rolling process are all descaled by adopting mill frame descaling water, so that the iron scales generated in the heating and rolling processes are removed, and the pattern defects are avoided.
Compared with the prior art, the invention has the advantages that:
the invention provides a method for effectively controlling pattern defects on the surface of a low-alloy steel plate, which comprises the technical improvements of chemical composition control, casting blank heating and hot rolling forming key procedures in the whole steel plate production process.
The method is based on long-term production practice, and a system solution is provided, so that compared with the prior art, the alloy cost and the energy consumption can be greatly reduced, and meanwhile, the production efficiency can be greatly improved. The proportion of the pitting defects on the surface of the steel plate produced by adopting the technical scheme of the invention can be stably controlled within 1 percent, the production process is simple, no additional equipment investment is required to be added, the operability is strong, and the steel plate is suitable for batch production.
Drawings
FIG. 1 is a topography of a prior art steel plate surface pattern defect;
FIG. 2 is a representative surface topography of a product of an embodiment of the present invention.
Detailed Description
The present invention is described in further detail below with reference to examples and comparative examples. The key technical parameters of the production of the steel plates of each embodiment are shown in table 1, the ratio of the pitted surface defects on the surfaces of the steel plates before and after the implementation of the technical scheme of the invention is shown in table 2, and the surface morphology of the product of the embodiment of the invention is shown in figure 2.
Before the technical scheme of the invention is implemented, the proportion of pattern defects on the surface of the low alloy structural steel plate is 4-10%, and after the technical scheme is implemented, the proportion of pattern defects on the surface of the low alloy structural steel plate is reduced to below 1%, so that the proportion of pattern defects is greatly reduced, and the implementation effect of the technical scheme of the invention is very obvious.
The low-alloy hot rolled steel plate for wind power adopts slab continuous casting production, and the main production procedures comprise KR molten iron pretreatment, converter smelting, LF refining, RH vacuum degassing, slab continuous casting, continuous casting slab heating and slab rolling in sequence according to the production sequence. On the basis of the disclosed production process, the production process optimization is carried out on the continuous casting billet heating and rolling process at the same time, so that the effective control of the pattern defects on the surface of the steel plate is realized, and the core technology is developed around three aspects: (1) Controlling the atmosphere in the heating furnace, adopting a low-temperature heating process technology, and reducing the generation of primary oxide scales; (2) The residence time and the waiting temperature time in the rolling process are shortened, and the secondary oxidation degree of the surface of the steel plate is reduced; (3) And high-pressure water dephosphorization is enhanced, dephosphorization passes are reasonably distributed, and iron scales are effectively removed. The specific technological measures of each procedure are as follows:
the elemental composition of each brand of steel sheet in this example is as follows: Q355B and Q355C are implemented according to GB/T1591-2018; the S355J2 execution standard is EN10025-2:2019. The above standard specifies: si is less than or equal to 0.55%, nb is less than or equal to 0.05%, on the basis of standard definition, the content of Si in the embodiment is further controlled to be Si0.25-0.50%, and the content of Nb is further controlled to be less than or equal to 0.005%.
Table 1 key process parameters for producing steel sheet of each example
Table 2 comparison of the results of inspecting the steel sheets of examples and the ratios of the defective steel sheets with patterns before and after the implementation of the technical scheme of the present invention
In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions that are formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.
Claims (5)
1. A method for effectively controlling pattern defects on the surface of a wind power steel plate is characterized by comprising the following steps of: comprising
And (3) casting blank heating control: the casting blank is fed into the furnace at the temperature ranging from 500 ℃ to 600 ℃, the total furnace time is 120 min to 150min, the temperature of the second heating section is 1130 ℃ to 1190 ℃, the temperature of the soaking section is 1150 ℃ to 1190 ℃, the total heating time of the second heating section and the soaking section is more than or equal to 40min, and the weak oxidizing atmosphere is controlled in the furnace;
and (3) casting blank rolling control: rolling by adopting a single-frame steckel mill, wherein the rolling comprises two stages of rough rolling and finish rolling, a slab is subjected to descaling by high-pressure water after being discharged from a heating furnace, then a billet is conveyed to a rolling mill, the rough rolling starting temperature is more than or equal to 1050 ℃, and a plurality of rolling passes in the rough rolling stage are subjected to descaling by adopting rolling mill frame descaling water; and in the finish rolling stage, a plurality of rolling passes are performed, except the last rolling pass, all other rolling passes are performed by adopting mill frame descaling water, the thickness of the intermediate blank to be heated is 1.8-2.2H, H is the thickness of a finished steel plate, and the initial rolling temperature in the finish rolling stage is controlled to be 920+/-20 ℃.
2. The method for effectively controlling the surface pattern defects of the wind power steel plate according to claim 1, wherein the method comprises the following steps of: in the casting blank heating stage, the air-fuel ratio in the heating furnace is less than 0.7.
3. The method for effectively controlling the surface pattern defects of the wind power steel plate according to claim 1, wherein the method comprises the following steps of: in the casting blank rolling stage, the water pressure is 21MPa during descaling, and the roller way speed is 0.8 m/s.
4. The method for effectively controlling the surface pattern defects of the wind power steel plate according to claim 1, wherein the method comprises the following steps of: and the casting blank rolling stage comprises 4 rolling passes in the rough rolling stage and 5 rolling passes in the finish rolling stage.
5. The method for effectively controlling the surface pattern defects of the wind power steel plate according to claim 1, wherein the method comprises the following steps of: the steel plate comprises 0.25-0.50% of Si and less than or equal to 0.005% of Nb in percentage by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311204986.XA CN117324401A (en) | 2023-09-19 | 2023-09-19 | Method for effectively controlling surface pattern defects of wind power steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311204986.XA CN117324401A (en) | 2023-09-19 | 2023-09-19 | Method for effectively controlling surface pattern defects of wind power steel plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117324401A true CN117324401A (en) | 2024-01-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311204986.XA Pending CN117324401A (en) | 2023-09-19 | 2023-09-19 | Method for effectively controlling surface pattern defects of wind power steel plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117324401A (en) |
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2023
- 2023-09-19 CN CN202311204986.XA patent/CN117324401A/en active Pending
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