CN115786667B - Method for improving wave shape of surface of part formed by rolling cold-rolled steel - Google Patents
Method for improving wave shape of surface of part formed by rolling cold-rolled steelInfo
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Abstract
本发明涉及一种改善冷轧钢辊压成型后零件表面浪形的方法，属于钢铁冶炼的技术领域。具体包括以下方法：(1)零件取样分析；(2)调整材料化学成分；(3)调整工艺参数；所述冷轧钢的制备包括钢材冶炼、连铸、热轧、酸轧、退火、平整、卷取。本发明从材料机械性能方面进行改善，从而改善成形后零件表面浪形的缺陷，有利于降低零件表面浪形缺陷的产生，提升零件生产的合格率，提高用户的经济效益。
The present invention relates to a method for improving the surface wavy shape of parts after cold-rolled steel roll forming, and belongs to the technical field of steel smelting. Specifically, the method comprises the following steps: (1) sampling and analyzing parts; (2) adjusting the chemical composition of the material; and (3) adjusting process parameters. The preparation of the cold-rolled steel comprises steel smelting, continuous casting, hot rolling, pickling, annealing, leveling, and coiling. The present invention improves the mechanical properties of the material, thereby improving the surface wavy shape defects of the parts after forming, which is conducive to reducing the occurrence of surface wavy defects of the parts, improving the qualified rate of parts production, and improving the economic benefits of users.
Description
Technical Field
The invention belongs to the technical field of steel smelting, and particularly relates to a method for improving the wave shape of the surface of a part after cold rolled steel roll forming.
Background
Cold rolled steel is produced by cold rolling, and is rolled at a temperature below the recrystallization temperature using hot rolled steel as a base material. Cold rolling is a process of further reducing a steel sheet to a target thickness at room temperature. Compared with a hot-rolled steel plate, the cold-rolled steel has the characteristics of good surface quality, excellent mechanical property, excellent technological property and the like, is widely applied to the industries of automobiles, household appliances and the like, has high requirements on the surface quality of the formed parts, and can seriously influence the appearance quality of the parts after the subsequent spraying and other processes if the surface has the defects of wave shape and the like. Therefore, it is important to improve the wave shape of the surface of the part after cold-rolled steel forming.
The wave-shaped defect on the surface of the part after roll forming is mainly caused by two reasons, namely (1) unreasonable setting of mould parameters of the part, such as pressure, clearance and the like. (2) mechanical properties of the part material are not suitable. Under the national standard, the grade of the steel selected by the part material usually has a larger performance interval, which can lead to the phenomenon that users purchase different surface quality of parts after rolling and forming of the same grade of steel.
Disclosure of Invention
The invention provides a method for improving the wave shape of the surface of a part formed by rolling cold-rolled steel, aiming at the problems in the prior art, so as to solve the problems. According to the actual production process of the rolling die and the surface morphology of the part after rolling forming, the yield strength of the material is improved by adjusting the annealing temperature and the flattening elongation of the strip steel, so that the yield strength of the material exceeds the longitudinal stress of rolling processing, the surface morphology of the part after rolling forming is improved, the application performance interval meeting the use of a user is finally determined, the problem that the wave defect appears on the surface of the part after the existing rolling forming is solved, and the qualification rate of part production is improved.
The technical scheme of the invention is as follows:
A method for improving the wave shape of the surface of a part after cold rolled steel is rolled and formed comprises the following steps of (1) part sampling analysis, (2) material chemical composition adjustment, and (3) process parameter adjustment.
The preparation of the cold rolled steel comprises the processes of steel smelting, continuous casting, hot rolling, acid rolling, annealing, leveling, coiling and the like.
Preferably, the part sampling analysis is performed on the part wave coil appeared by a user, and it is clear that the reason why the part surface wave shape is generated is caused by that the longitudinal stress exceeds the yield strength of the material during roll forming.
Preferably, the components of the part after adjustment comprise the steps of increasing the content of C to 0.06% -0.12%, increasing the content of Mn to 0.6% -0.15%, increasing the content of Nb to 0.03% -0.09%, controlling the content of Si to be below 0.05%, controlling the content of Al to 0.015% -0.1% and controlling the content of P, S to be below 0.025.
Preferably, the adjusted process parameters include reducing the soaking temperature to 750 ℃ to 780 ℃.
Preferably, the adjusted process parameters include adjusting the leveling elongation to 1.1% -1.2%.
The hot continuous rolling is preferably carried out at a slab heating temperature of 1200-1270 ℃ and a furnace time of 140-280 min, seven-frame continuous rolling at a rough rolling start temperature of 1050-1090 ℃, a finish rolling start temperature of 985-1060 ℃, a finish rolling temperature of 870-920 ℃, a post-stage laminar cooling mode after rolling, U-shaped coiling, coiling temperature in the head and tail parts of 40 m of 570-710 ℃ and coiling temperature in the middle part of 540-680 ℃.
The continuous acid rolling is carried out by adding 1-2 per mill of pickling corrosion inhibitor into a pickling tank 2 hours in advance, the pickling process speed is more than or equal to 100m/min, the process section outlet inspection confirms that the surface of the steel plate is free of over-pickling and under-pickling, and the total reduction rate is 46.66-88.0 percent.
The continuous annealing is carried out at the annealing speed of less than or equal to 240m/min, the hydrogen content in the furnace is 3% -7%, the oxygen content is less than or equal to 10ppm, the furnace pressure is 100-400 Pa, the soaking temperature is 750-780 ℃, the slow cooling end temperature is 640-700 ℃, the quick cooling end temperature is 300-460 ℃, the aging end temperature is 280-380 ℃, and the final cooling tapping temperature is less than or equal to 155 ℃.
The leveling is that the roller roughness (Ra) is 2.0-4.0 mu m, the peak value number (Pc) of a working roller is 90-100 cm, the concentration of leveling liquid is 3%, the leveling elongation is 1.1% -1.2%, the surface roughness (Ra) of strip steel is 0.6-1.90 mu m, and when the surface roughness (Ra) is not consistent with the surface roughness, the roller is immediately replaced on line.
The beneficial effects of the invention are as follows:
The invention improves the mechanical property of the material, thereby improving the wave-shaped defect of the surface of the formed part, being beneficial to reducing the generation of the wave-shaped defect of the surface of the part, improving the qualification rate of the production of the part and improving the economic benefit of users.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a simplified schematic diagram of a roll forming process according to an embodiment of the present invention.
Fig. 2 is a diagram of a real appearance of a wave-shaped defect on the surface of a cold-rolled structural steel part according to an embodiment of the invention.
FIG. 3 is a physical diagram of the surface morphology of the part after the cold rolling structural steel process is improved according to the embodiment of the invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
A method for improving the wave shape of the surface of a part after cold rolled steel rolling forming comprises the following steps:
(1) Steel smelting
The steel after smelting is controlled to contain 0.066% of C, 0.7% of Mn, 0.031% of Nb, 0.02% of Si, 0.036% of Al, 0.016% of P, 0.008% of S and the balance of Fe.
(2) Continuous casting
The liquid molten steel is quickly solidified and crystallized, cooled, electromagnetically stirred and cut into slabs with certain length, and the head and the tail are peeled.
(3) Hot rolling
The slab heating temperature is controlled to be 1210-1270 ℃ and the furnace time is controlled to be 240min, seven frames are continuously rolled, the initial rolling temperature of rough rolling is 1050-1090 ℃, the initial rolling temperature of finish rolling is 985-1060 ℃, the final rolling temperature of finish rolling is 870-920 ℃, a back stage laminar cooling mode is adopted after rolling, U-shaped coiling is used, the coiling temperature in the head and tail parts is 600-670 ℃, and the coiling temperature in the middle part is 570-640 ℃.
(4) Acid rolling
The pickling tank is added with pickling corrosion inhibitor with the concentration of 1-2 per mill in advance for 2 hours, the pickling process speed is more than or equal to 100m/min, the process section outlet inspection confirms that the surface of the steel plate is free of pickling and undershot pickling, and the total reduction rate of five-frame continuous rolling is 71.4 percent.
(5) Annealing
The annealing speed is less than or equal to 240m/min, the hydrogen content in the furnace is 3% -7%, the oxygen content is less than or equal to 10ppm, the furnace pressure is 100-400 Pa, the soaking temperature is 750 ℃, the slow cooling end temperature is 640-670 ℃, the fast cooling end temperature is 410-450 ℃, the aging end temperature is 340-380 ℃, and the final cooling tapping temperature is less than or equal to 155 ℃.
(6) Leveling out
The working roll is a common roll, the roll roughness (Ra) is 3.0 mu m, the working roll peak value (Pc) is 90-100 cm, the concentration of the leveling liquid is 3%, the leveling elongation is 1.1%, and the strip steel surface roughness (Ra) is 0.6-1.9 mu m.
Example 2
A method for improving the wave shape of the surface of a part after cold rolled steel rolling forming comprises the following steps:
(1) Steel smelting
The steel after smelting is controlled to contain 0.064% of C, 0.71% of Mn, 0.029% of Nb, 0.02% of Si, 0.036% of Al, 0.016% of P, 0.006% of S and the balance of Fe.
(2) Continuous casting
The liquid molten steel is quickly solidified and crystallized, cooled, electromagnetically stirred and cut into slabs with certain length, and the head and the tail are peeled.
(3) Hot rolling
The slab heating temperature is controlled to be 1210-1270 ℃ and the furnace time is controlled to be 240min, seven frames are continuously rolled, the initial rolling temperature of rough rolling is 1050-1090 ℃, the initial rolling temperature of finish rolling is 985-1060 ℃, the final rolling temperature of finish rolling is 870-920 ℃, a back stage laminar cooling mode is adopted after rolling, U-shaped coiling is used, the coiling temperature in the head and tail parts is 600-670 ℃, and the coiling temperature in the middle part is 570-640 ℃.
(4) Acid rolling
The pickling tank is added with pickling corrosion inhibitor with the concentration of 1-2 per mill in advance for 2 hours, the pickling process speed is more than or equal to 100m/min, the process section outlet inspection confirms that the surface of the steel plate is free of pickling and undershot pickling, and the total reduction rate of five-frame continuous rolling is 71.4 percent.
(5) Annealing
The annealing speed is less than or equal to 240m/min, the hydrogen content in the furnace is 3% -7%, the oxygen content is less than or equal to 10ppm, the furnace pressure is 100-400 Pa, the soaking temperature is 750 ℃, the slow cooling end temperature is 640-670 ℃, the fast cooling end temperature is 410-450 ℃, the aging end temperature is 340-380 ℃, and the final cooling tapping temperature is less than or equal to 155 ℃.
(6) Leveling out
The working roll is a common roll, the roll roughness (Ra) is 3.0 mu m, the working roll peak value (Pc) is 90-100 cm, the concentration of the leveling liquid is 3%, the leveling elongation is 1.2%, and the strip steel surface roughness (Ra) is 0.6-1.9 mu m.
Example 3
A method for improving the wave shape of the surface of a part after cold rolled steel rolling forming comprises the following steps:
(1) Steel smelting
The steel after smelting is controlled to contain 0.067% of C, 0.7% of Mn, 0.03% of Nb, 0.03% of Si, 0.046% of Al, 0.015% of P, 0.006% of S and the balance of Fe.
(2) Continuous casting
The liquid molten steel is quickly solidified and crystallized, cooled, electromagnetically stirred and cut into slabs with certain length, and the head and the tail are peeled.
(3) Hot rolling
The slab heating temperature is controlled to be 1210-1270 ℃ and the furnace time is controlled to be 240min, seven frames are continuously rolled, the initial rolling temperature of rough rolling is 1050-1090 ℃, the initial rolling temperature of finish rolling is 985-1060 ℃, the final rolling temperature of finish rolling is 870-920 ℃, a back stage laminar cooling mode is adopted after rolling, U-shaped coiling is used, the coiling temperature in the head and tail parts is 600-670 ℃, and the coiling temperature in the middle part is 570-640 ℃.
(4) Acid rolling
The pickling tank is added with pickling corrosion inhibitor with the concentration of 1-2 per mill in advance for 2 hours, the pickling process speed is more than or equal to 100m/min, the process section outlet inspection confirms that the surface of the steel plate is free of pickling and undershot pickling, and the total reduction rate of five-frame continuous rolling is 71.4 percent.
(5) Annealing
The annealing speed is less than or equal to 240m/min, the hydrogen content in the furnace is 3% -7%, the oxygen content is less than or equal to 10ppm, the furnace pressure is 100-400 Pa, the soaking temperature is 760 ℃, the slow cooling end temperature is 640-670 ℃, the fast cooling end temperature is 410-450 ℃, the aging end temperature is 340-380 ℃, and the final cooling tapping temperature is less than or equal to 155 ℃.
(6) Leveling out
The working roll is a common roll, the roll roughness (Ra) is 3.0 mu m, the working roll peak value (Pc) is 90-100 cm, the concentration of the leveling liquid is 3%, the leveling elongation is 1.1%, and the strip steel surface roughness (Ra) is 0.6-1.9 mu m.
Comparative example 1
A method for improving the wave shape of the surface of a part after cold rolled steel rolling forming comprises the following steps:
(1) Steel smelting
The steel after smelting is controlled to contain 0.067% of C, 0.69% of Mn, 0.032% of Nb, 0.03% of Si, 0.043% of Al, 0.015% of P, 0.005% of S and the balance of Fe.
(2) Continuous casting
The liquid molten steel is quickly solidified and crystallized, cooled, electromagnetically stirred and cut into slabs with certain length, and the head and the tail are peeled.
(3) Hot rolling
The slab heating temperature is controlled to be 1210-1270 ℃ and the furnace time is controlled to be 240min, seven frames are continuously rolled, the initial rolling temperature of rough rolling is 1050-1090 ℃, the initial rolling temperature of finish rolling is 985-1060 ℃, the final rolling temperature of finish rolling is 870-920 ℃, a back stage laminar cooling mode is adopted after rolling, U-shaped coiling is used, the coiling temperature in the head and tail parts is 600-670 ℃, and the coiling temperature in the middle part is 570-640 ℃.
(4) Acid rolling
The pickling tank is added with pickling corrosion inhibitor with the concentration of 1-2 per mill in advance for 2 hours, the pickling process speed is more than or equal to 100m/min, the process section outlet inspection confirms that the surface of the steel plate is free of pickling and undershot pickling, and the total reduction rate of five-frame continuous rolling is 71.4 percent.
(5) Annealing
The annealing speed is less than or equal to 240m/min, the hydrogen content in the furnace is 3% -7%, the oxygen content is less than or equal to 10ppm, the furnace pressure is 100-400 Pa, the soaking temperature is 780 ℃, the slow cooling end temperature is 640-670 ℃, the fast cooling end temperature is 410-450 ℃, the aging end temperature is 340-380 ℃, and the final cooling tapping temperature is less than or equal to 155 ℃.
(6) Leveling out
The working roll is a common roll, the roll roughness (Ra) is 3.0 mu m, the working roll peak value (Pc) is 90-100 cm, the concentration of the leveling liquid is 3%, the leveling elongation is 1.0%, and the strip steel surface roughness (Ra) is 0.6-1.9 mu m.
Test case
The products produced in examples 1 to 3 and comparative examples were subjected to correlation detection, and the detection results are shown in Table 1 below:
TABLE 1 detection results
| Rel/Rp0.2/MPa | Rm/MPa | A80/% | |
| Example 1 | 380 | 463 | 30.2 |
| Example 2 | 383 | 465 | 30.4 |
| Example 3 | 377 | 461 | 30 |
| Comparative example 1 | 342 | 459 | 28.0 |
According to the mechanical property results of the embodiments 1-3 and the comparative examples and the analysis of the use condition of the user, the strength of the finished product can be improved by reducing the annealing temperature and improving the flattening elongation in the embodiments, and as can be seen from the figures 2 and 3, the wave defect of the surface of the part after the rolling forming can be obviously improved by using the cold rolled steel under the new process, and the mechanical properties of the steel coil after the modification process of the embodiments 1-3 are higher than the longitudinal stress of the part during the rolling forming, so that the use requirement of the user is met, the application performance interval of the specific use of the user is clarified by the subsequent trial for multiple times, and the wave defect of the surface of the part does not appear after the subsequent supply.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A method for improving the wave shape of the surface of a part after cold rolled steel rolling forming is characterized by comprising the following steps of (1) part sampling analysis, (2) material chemical composition adjustment and (3) process parameter adjustment;
the preparation method of the cold rolled steel comprises the steps of steel smelting, continuous casting, hot continuous rolling, acid continuous rolling, continuous annealing, leveling and coiling;
The components of the part after adjustment comprise the steps of increasing the content of C to 0.06% -0.12%, increasing the content of Mn to 0.6% -0.71%, increasing the content of Nb to 0.03% -0.09%, controlling the content of Si to be less than 0.05%, controlling the content of Al to 0.015% -0.1%, and controlling the content of P, S to be less than 0.025%;
The continuous annealing is that the annealing speed is less than or equal to 240m/min, the hydrogen content in the furnace is 3-7%, the oxygen content is less than or equal to 10ppm, the furnace pressure is 100-400 Pa, the soaking temperature is 750-780 ℃, the slow cooling end temperature is 640-700 ℃, the quick cooling end temperature is 300-460 ℃, the aging end temperature is 280-380 ℃, and the final cooling tapping temperature is less than or equal to 155 ℃;
the leveling is that the roller roughness is 2.0-4.0 mu m, the peak value of the working roller is 90-100 cm, the concentration of leveling liquid is 3%, the leveling elongation is 1.1% -1.2%, and the surface roughness of the strip steel is 0.6-1.90 mu m.
2. The method of claim 1, wherein the part sampling analysis is performed on a user's appearance of a part wave roll, and it is determined that the part surface wave is generated due to a longitudinal stress exceeding the yield strength of the material during roll forming.
3. The method for rolling the surface wave shape of the formed part by cold rolled steel according to claim 1 is characterized in that hot continuous rolling is conducted at a slab heating temperature of 1200-1270 ℃ and a furnace time of 140-280 min, seven-frame continuous rolling is conducted at a rough rolling start temperature of 1050-1090 ℃, a finish rolling start temperature of 985-1060 ℃ and a finish rolling temperature of 870-920 ℃, a post-stage laminar cooling mode is adopted after rolling, U-shaped coiling is conducted, and coiling temperatures in the head and tail parts of 40m are 570-710 ℃ and the middle part of 540-680 ℃.
4. The method for forming the wave-shaped part surface after the cold rolled steel rolling according to claim 1, wherein the acid continuous rolling is carried out by adding 1-2 per mill concentration of pickling inhibitor into a pickling tank 2 hours in advance, the pickling process speed is more than or equal to 100m/min, the process section outlet inspection confirms that the surface of the steel plate is free of over-pickling and under-pickling, and the total reduction rate is 46.66-88.0 percent.
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| CN102650016B (en) * | 2012-05-24 | 2014-03-19 | 宝山钢铁股份有限公司 | Manufacturing method for high-magnetic induction low-cost 250 MPa cold-rolled magnetic pole steel |
| CN111304540A (en) * | 2020-04-10 | 2020-06-19 | 山东钢铁集团日照有限公司 | Cold-rolled steel strip for 280 Mpa-grade automobile structure and manufacturing method thereof |
| CN114657473A (en) * | 2022-02-24 | 2022-06-24 | 山东钢铁集团日照有限公司 | Cold-rolled enamel steel for deep drawing and preparation method thereof |
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| CN114686769A (en) * | 2022-04-12 | 2022-07-01 | 山东钢铁集团日照有限公司 | Low-cost cold-rolled steel strip for electricians and manufacturing method thereof |
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