CN112126864A - Production method of cold-rolled steel plate for microwave oven box - Google Patents
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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Abstract
The invention discloses a production method of a cold-rolled steel plate for a microwave oven box, which comprises the steps of continuously casting blast furnace molten iron into a plate blank with the thickness of 230mm after KR desulfurization, converter smelting and RH refining, directly conveying the plate blank in red, carrying out complete austenite area rolling, front-section rapid laminar cooling, middle-high temperature coiling, naturally cooling to below 60 ℃ in air to obtain a hot-rolled coil with uniform ferrite structure and fully precipitated AlN particles, then carrying out cold rolling for re-uncoiling, continuous pickling and fine edge cutting, rolling into a chilled coil under high pressure, carrying out strong cleaning, middle-high temperature continuous annealing, and flattening under low pressure to obtain a finished steel plate. The yield strength of the cold-rolled finished steel plate is stable between 240MPa and 300MPa, the elongation after fracture is more than or equal to 35 percent, the steel plate has excellent forming and processing properties, the rigidity after forming is good, the flatness of the steel plate is excellent, the wave height is stably controlled within 3mm, the jerk is less than or equal to 1.5 percent, the surface quality and the coating properties are good, and the comprehensive requirements of the steel for the microwave oven box body are completely met.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a production method of a cold-rolled steel plate for a microwave oven box.
Background
The special cold-rolled steel plate for the microwave oven box body is strictly required to be thin in specification (the thickness is 0.30-0.40 mm), high in strength (the yield strength is 240-300 MPa), flat in plate shape (the wave height is less than or equal to 3mm, the jerkiness is less than or equal to 1.5%) and good in coating performance, so that the special cold-rolled steel plate belongs to a variety with high production difficulty and high technical content in steel products, and only a few large-scale steel enterprises in China can produce in batches and stably supply goods. The alloy addition is more during the component design of most steel enterprises, the process is relatively complex, and the use cost of steel customers for microwave ovens is directly increased.
CN108866451A discloses a cold-rolled steel sheet for a 240 MPa-level yield strength structure and a preparation method thereof, wherein C is more than or equal to 0.15% and less than or equal to 0.18%, the yield strength of the cold-rolled steel sheet is 240-340 MPa, and the elongation after fracture is more than or equal to 29%. The product of the patent is mainly increased in strength by greatly improving the content of C, has low elongation after fracture and slightly poor processing and forming performance, and is only suitable for manufacturing bent reinforced structural part products. For the box steel plate material for the microwave oven, when the yield strength exceeds 300MPa, obvious springback phenomenon can occur after the cold-rolled steel plate is curled and formed, so that the subsequent assembly of box parts is difficult. Therefore, the product and the method of the patent cannot be completely applied to the requirement of the steel for the box body of the microwave oven.
CN109778069A discloses a one-steel multi-stage low-alloy high-strength steel and a manufacturing method thereof, wherein C is more than or equal to 0.05% and less than or equal to 0.09%, P is more than or equal to 0.010% and less than or equal to 0.025%, Nb is more than or equal to 0.010% and less than or equal to 0.020%, the yield strength of a cold-rolled steel sheet is 240-320 MPa, and the elongation after fracture is more than or equal to 28%. The product of the patent is slightly higher in yield strength, and more importantly, the precious metal Nb is added into the components, so that the production cost is greatly increased, and the product is completely not suitable for being used by customers of steel for microwave ovens with strictly controlled cost.
CN105369133A discloses a cold-rolled steel sheet for refrigerator side plates and a preparation method thereof, wherein C is more than or equal to 0.05% and less than or equal to 0.08%, P is more than or equal to 0.007% and less than or equal to 0.015%, B is more than or equal to 0.002% and less than or equal to 0.006%, the yield strength of the cold-rolled steel sheet is 223-257 MPa, and the elongation after breakage is more than or equal to 35%. The thickness of the product is more than 0.50mm, the yield strength is slightly low, and the risk of insufficient dent resistance and rigidity exists after the microwave oven box body is manufactured. In addition, the B element is added to the product of the patent to inhibit P segregation, and the production cost is also increased. In conclusion, the product and the method of the patent can not be completely suitable for the requirements of the steel for the box body of the microwave oven.
Disclosure of Invention
In order to meet the severe comprehensive use requirement of the cold-rolled steel plate for the microwave oven box, the invention aims to provide a production method of the cold-rolled steel plate for the microwave oven box. Blast furnace molten iron is desulfurized by KR, smelted by a converter and refined by RH, continuously cast into a plate blank with the thickness of 230mm, directly conveyed in red, rolled by a complete austenite region, quickly cooled by laminar flow at the front section, coiled at medium and high temperature, naturally cooled to below 60 ℃ in air to obtain a hot rolled coil with uniform ferrite structure and fully precipitated AlN particles, then cold rolled, uncoiled again, continuously acid-washed, finely cut edge, rolled under high pressure to form a cold-hard coil, then strongly cleaned, continuously annealed at medium and high temperature, and flattened under low pressure to obtain a finished steel plate. Through the component control of the steelmaking process and the full-flow process control of the hot rolling and cold rolling processes, the mass production and stable material supply of the cold-rolled steel plate product for the high-strength microwave oven box with the thickness of 0.40mm or less are realized.
The technical scheme adopted by the invention for solving the technical problems is as follows: the cold-rolled steel plate for the microwave oven box comprises the following components: c is more than or equal to 0.045 and less than or equal to 0.065 percent, Mn is more than or equal to 0.20 percent and less than or equal to 0.50 percent, Si is less than or equal to 0.040 percent, P is less than or equal to 0.015 percent, Als is more than or equal to 0.020 percent and less than or equal to 0.060 percent, N is more than or equal to 0.0030 percent and less than or equal to 0.0065 percent, and the balance is Fe and other residual trace elements.
The production method of the cold-rolled steel plate for the microwave oven box comprises the following steps:
(1) s is less than or equal to 0.010 percent after KR desulfurization in the steelmaking process, the end point temperature of a converter is 1680-1720 ℃, the RH refining decarburization vacuum degree is less than or equal to 133pa, the decarburization time is 5-15 min, the pure degassing time is 3-10 min, the argon blowing flow between continuous casting plates is 1-8L/min, the liquid level fluctuation is +/-3 mm, the constant drawing speed is more than or equal to 1.0m/min for casting, and no judgment is needed after the head and tail blanks are stripped;
(2) the hot rolling process has the advantages that the hot rolling process is preferentially carried out in a red mode, medium-temperature heating is carried out, the furnace time is shortened, the discharging temperature of a plate blank is 1240 +/-20 ℃, the furnace time is 140-220 min, the final rolling temperature is 860-900 ℃, the coiling temperature is 640-680 ℃, the thickness of a hot rolled coil is 1.80-2.50 mm, and the convexity is 40-70 mu m; the edge heater and the heat preservation cover are thrown to the through roll;
(3) the running speed of the pickling process section is 120-240 mpm, the total rolling reduction rate of cold rolling is 77-88%, and the cold-hard wave shape after rolling is less than or equal to 12I-Unit;
(4) the reflectivity of the surface of the steel plate after cleaning in the cleaning section of the continuous annealing process is more than or equal to 92 percent, the running speed of the annealing process section is 180-300 mpm, the hydrogen content in the furnace is 4-7 percent, the oxygen content is less than or equal to 10ppm, and the furnace pressure is 150-300 pa;
(5) the soaking temperature of the continuous annealing process is 740-760 ℃, and the slow cooling temperature is 660-680 ℃;
(6) the leveling working roll in the continuous annealing process adopts a flat roll, the roughness Ra is 2.25-3.0 mu m, the Rpc is more than 80/cm, and the leveling elongation is 0.5-0.9%.
The invention has the following beneficial effects: the invention provides a production method of an extremely-thin cold-rolled steel sheet product for a microwave oven box, wherein the yield strength of a cold-rolled finished steel sheet is stabilized at 240-300 MPa, the elongation after fracture is more than or equal to 35%, the cold-rolled finished steel sheet has excellent forming processability, the rigidity after forming is good, the flatness of the steel sheet is excellent, the wave height is stably controlled within 3mm, the degree of emergency is less than or equal to 1.5%, the surface quality and the coating performance are good, and the comprehensive requirements of the steel for the microwave oven box are completely met. The invention has stable production process, low manufacturing cost, obvious economic benefit and brand benefit and is very suitable for popularization and application in domestic mainstream iron and steel enterprises.
Drawings
FIG. 1 is a microstructure diagram of a finished steel sheet in example 1 of the present invention in a normal process.
FIG. 2 is a microstructure diagram of a finished steel sheet when the N content exceeds the standard in comparative example 1 of the present invention.
Detailed Description
The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the scope of the present invention is not limited to these examples. All changes, modifications and equivalents that do not depart from the spirit of the invention are intended to be included within the scope thereof.
The theoretical basis of the invention is as follows:
(1) the high yield strength and good forming performance are provided by the proper amount of C, Mn in the component design, the steel plate has insufficient strength when the C is less than or equal to 0.045 percent and can not meet the rigidity requirement of the microwave oven box body, and the yield strength is too high when the C is more than or equal to 0.065 percent and is not beneficial to subsequent forming and welding; on the premise of further ensuring the strength, a proper amount of N is controlled for saving alloy cost, but when the N is more than or equal to 0.0065%, the recrystallization of crystal grains in the annealing of the steel plate is inhibited and the steel plate is in a flat and elongated state, so that the strength of the steel plate is sharply increased, and the forming performance is greatly reduced; the proper Al content ensures the deoxidation and nitrogen fixation effects, and the cost is not economical when the Al content is too high.
(2) In the process design, a heat-insulating cover and an edge heater are used in the hot rolling process to ensure the convexity and the plate shape of a hot rolled material, so that the plate shape of a finished product after acid rolling and continuous annealing is ensured; the acid rolling process ensures that the crystal grains are fully elongated and broken under high pressure, and is favorable for improving the forming performance after annealing; the surface quality and the mechanical property of the finished product are controlled in the continuous annealing process, and the plate shape guaranteeing capability and the forming and coating properties are further improved after the product is specially leveled.
The invention relates to a cold-rolled steel plate for a microwave oven box, which comprises the following components: c is more than or equal to 0.045 and less than or equal to 0.065 percent, Mn is more than or equal to 0.20 percent and less than or equal to 0.50 percent, Si is less than or equal to 0.040 percent, P is less than or equal to 0.015 percent, Als is more than or equal to 0.020 percent and less than or equal to 0.060 percent, N is more than or equal to 0.0030 percent and less than or equal to 0.0065 percent, and the balance is Fe and other residual trace elements.
The production method of the cold-rolled steel plate for the microwave oven box comprises the following steps:
(1) s is less than or equal to 0.010 percent after KR desulfurization in the steelmaking process, the end point temperature of a converter is 1680-1720 ℃, the RH refining decarburization vacuum degree is less than or equal to 133pa, the decarburization time is 5-15 min, the pure degassing time is 3-10 min, the argon blowing flow between continuous casting plates is 1-8L/min, the liquid level fluctuation is +/-3 mm, the constant drawing speed is more than or equal to 1.0m/min for casting, and no judgment is needed after the head and tail blanks are stripped;
(2) the hot rolling process has the advantages that the hot rolling process is preferentially carried out in a red mode, medium-temperature heating is carried out, the furnace time is shortened, the discharging temperature of a plate blank is 1240 +/-20 ℃, the furnace time is 140-220 min, the final rolling temperature is 860-900 ℃, the coiling temperature is 640-680 ℃, the thickness of a hot rolled coil is 1.80-2.50 mm, and the convexity is 40-70 mu m; the edge heater and the heat preservation cover are thrown to the through roll;
(3) the running speed of the pickling process section is 120-240 mpm, the total rolling reduction rate of cold rolling is 77-88%, and the cold-hard wave shape after rolling is less than or equal to 12I-Unit;
(4) the reflectivity of the surface of the steel plate after cleaning in the cleaning section of the continuous annealing process is more than or equal to 92 percent, the running speed of the annealing process section is 180-300 mpm, the hydrogen content in the furnace is 4-7 percent, the oxygen content is less than or equal to 10ppm, and the furnace pressure is 150-300 pa;
(5) the soaking temperature of the continuous annealing process is 740-760 ℃, and the slow cooling temperature is 660-680 ℃;
(6) the leveling working roll in the continuous annealing process adopts a flat roll, the roughness Ra is 2.25-3.0 mu m, the Rpc is more than 80/cm, and the leveling elongation is 0.5-0.9%.
Example 1
The smelting components are controlled as follows: 0.053% of C, 0.36% of Mn, 0.017% of Si, 0.010% of P, 0.007% of S, 0.028% of Als, 0.0042% of N, and the balance of Fe and other residual trace elements.
The whole process is controlled as follows: the content of S after KR desulfurization in the steelmaking process is 0.008 percent, the end point temperature of a converter is 1710 ℃, the RH refining decarburization vacuum degree is 30-45 pa, the decarburization time is 9min, the pure degassing time is 4min, the argon blowing flow between continuous casting plates is 5L/min, the liquid level fluctuation is +/-2.0 mm, and the constant drawing speed pouring is 1.0 m/min. The hot rolling process is carried out in a red feeding mode, the tapping temperature of the plate blank is 1225 ℃, the in-furnace time is 148min, the finish rolling temperature is 880 ℃, the coiling temperature is 649 ℃, the thickness of the hot rolled coil is 2.3mm, the convexity is 48 mu m, and an edge heater and a heat preservation cover are put into the coil. The running speed of the pickling process section is 190mpm, the total rolling reduction rate of the cold rolling is 83.9 percent, and the cold hard wave shape after the rolling is less than or equal to 8I-Unit. The reflectivity of the surface of the steel plate after cleaning at the cleaning section in the continuous annealing process is 92.0 percent, the running speed of the annealing process section is 200mpm, the hydrogen content in the furnace is 4.5 percent, the oxygen content is 3ppm, and the furnace pressure is 276 pa. The soaking temperature of the continuous annealing process is 760 ℃, and the slow cooling temperature is 668 ℃. The leveling working roll in the continuous annealing process adopts a flat roll, the roughness Ra is 2.5 mu m, the Rpc is 98/cm, and the leveling elongation is 0.6%.
The metallurgical composition control of example 1 is shown in Table 1, the steelmaking process control is shown in Table 2, the hot rolling process control is shown in Table 3, the cold rolling process control is shown in Table 4, and the properties, roughness and flatness performance of the finished steel sheet are shown in Table 5.
The steps of the embodiments 2-3 are the same as those of the embodiment 1, all smelting components and process parameters meet the technical range of the patent requirements, the performance, the roughness and the plate shape of the finished steel plate are excellent and can meet the use requirements of the cold-rolled steel plate for the microwave oven box, and the performance, the roughness and the plate shape of the finished steel plate are detailed in a table 5.
The smelting composition of comparative example 1 was controlled as shown in Table 1, and the N content was controlled to 0.0084% exceeding the upper limit of 0.0065%. The steel-making process is controlled as shown in the table 2, the hot-rolling process is controlled as shown in the table 3, the cold-rolling process is controlled as shown in the table 4, the yield strength of the finished steel plate is higher, the use requirement of the cold-rolled steel plate for the microwave oven box cannot be met, and the performance, the roughness and the plate shape of the finished steel plate are detailed in the table 5.
The smelting composition control of comparative example 2 is shown in Table 1, and the steel making process control is shown in Table 2. The hot rolling process is controlled as shown in Table 3, the convexity is controlled to be 22 μm and less than 40 μm, and the edge heater and the heat preservation cover are not used. The cold rolling process is controlled as shown in table 4, the finished steel plate has poor shape and cannot meet the use requirements of the cold-rolled steel plate for the microwave oven box, and the performance, the roughness and the shape performance of the finished steel plate are detailed in table 5.
TABLE 1 metallurgical compositions of examples and comparative examples
| Name (R) | C/％ | Mn/％ | Si/％ | P/％ | S/％ | Als/％ | N/％ |
| Example 1 | 0.053 | 0.36 | 0.017 | 0.010 | 0.007 | 0.028 | 0.0042 |
| Example 2 | 0.064 | 0.32 | 0.015 | 0.009 | 0.008 | 0.032 | 0.0044 |
| Example 3 | 0.049 | 0.25 | 0.009 | 0.009 | 0.011 | 0.025 | 0.0055 |
| Comparative example 1 | 0.054 | 0.34 | 0.013 | 0.011 | 0.008 | 0.027 | 0.0084 |
| Comparative example 2 | 0.045 | 0.33 | 0.015 | 0.011 | 0.009 | 0.030 | 0.0035 |
TABLE 2 steelmaking Process parameters for the examples and comparative examples
TABLE 3 Hot Rolling Process parameters of examples and comparative examples
TABLE 4 acid rolling, annealing and temper rolling process parameters for examples and comparative examples
TABLE 5 mechanical Properties and flatness parameters of examples and comparative examples
FIG. 1 is a microstructure of a finished steel sheet according to example 1 of the present invention in a normal process, in which the grains are relatively uniform and equiaxed, and the grain size is about 10.5 grade; FIG. 2 is a microstructure diagram when the N content exceeds the standard in comparative example 1 of the present invention, and the crystal grains are flat elongated and have a grain size of about 11.5 grade.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (2)
1. The production method of the cold-rolled steel plate for the microwave oven box is characterized by comprising the following steps of:
(1) s is less than or equal to 0.010 percent after KR desulfurization in the steelmaking process, the end point temperature of a converter is 1680-1720 ℃, the RH refining decarburization vacuum degree is less than or equal to 133pa, the decarburization time is 5-15 min, the pure degassing time is 3-10 min, the argon blowing flow between continuous casting plates is 1-8L/min, the liquid level fluctuation is +/-3 mm, the constant drawing speed is more than or equal to 1.0m/min for casting, and no judgment is needed after the head and tail blanks are stripped;
(2) the hot rolling process has the advantages that the hot rolling process is preferentially carried out in a red mode, medium-temperature heating is carried out, the furnace time is shortened, the discharging temperature of a plate blank is 1240 +/-20 ℃, the furnace time is 140-220 min, the final rolling temperature is 860-900 ℃, the coiling temperature is 640-680 ℃, the thickness of a hot rolled coil is 1.80-2.50 mm, and the convexity is 40-70 mu m; the edge heater and the heat preservation cover are thrown to the through roll;
(3) the running speed of the pickling process section is 120-240 mpm, the total rolling reduction rate of cold rolling is 77-88%, and the cold-hard wave shape after rolling is less than or equal to 12I-Unit;
(4) the reflectivity of the surface of the steel plate after cleaning in the cleaning section of the continuous annealing process is more than or equal to 92 percent, the running speed of the annealing process section is 180-300 mpm, the hydrogen content in the furnace is 4-7 percent, the oxygen content is less than or equal to 10ppm, and the furnace pressure is 150-300 pa;
(5) the soaking temperature of the continuous annealing process is 740-760 ℃, and the slow cooling temperature is 660-680 ℃;
(6) the leveling working roll in the continuous annealing process adopts a flat roll, the roughness Ra is 2.25-3.0 mu m, the Rpc is more than 80/cm, and the leveling elongation is 0.5-0.9%.
2. The method for manufacturing a cold rolled steel sheet for a microwave oven case as claimed in claim 1, wherein the composition of the steel-making process is designed as follows: c is more than or equal to 0.045 and less than or equal to 0.065 percent, Mn is more than or equal to 0.20 percent and less than or equal to 0.50 percent, Si is less than or equal to 0.040 percent, P is less than or equal to 0.015 percent, Als is more than or equal to 0.020 percent and less than or equal to 0.060 percent, N is more than or equal to 0.030 percent and less than or equal to 0.065 percent, and the balance is Fe and other residual trace elements.
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| CN112872082A (en) * | 2021-01-14 | 2021-06-01 | 山东钢铁集团日照有限公司 | Plate shape control method for extreme width and thickness deep-drawing galvanized steel plate |
| CN112899576A (en) * | 2021-01-15 | 2021-06-04 | 山东钢铁集团日照有限公司 | Cold-rolled steel plate for precision household electric welding pipe and production method thereof |
| CN112893459A (en) * | 2021-01-14 | 2021-06-04 | 山东钢铁集团日照有限公司 | Plate shape control method for cold rolling limit wide thin deep drawing steel |
| CN114908209A (en) * | 2022-04-02 | 2022-08-16 | 山西太钢不锈钢股份有限公司 | Method for improving surface quality of cold-rolled deep-drawing steel |
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| CN112872082A (en) * | 2021-01-14 | 2021-06-01 | 山东钢铁集团日照有限公司 | Plate shape control method for extreme width and thickness deep-drawing galvanized steel plate |
| CN112893459A (en) * | 2021-01-14 | 2021-06-04 | 山东钢铁集团日照有限公司 | Plate shape control method for cold rolling limit wide thin deep drawing steel |
| CN112872082B (en) * | 2021-01-14 | 2022-04-01 | 山东钢铁集团日照有限公司 | Plate shape control method for extreme width and thickness deep-drawing galvanized steel plate |
| CN112893459B (en) * | 2021-01-14 | 2022-04-22 | 山东钢铁集团日照有限公司 | Plate shape control method for cold rolling limit wide thin deep drawing steel |
| CN112899576A (en) * | 2021-01-15 | 2021-06-04 | 山东钢铁集团日照有限公司 | Cold-rolled steel plate for precision household electric welding pipe and production method thereof |
| CN114908209A (en) * | 2022-04-02 | 2022-08-16 | 山西太钢不锈钢股份有限公司 | Method for improving surface quality of cold-rolled deep-drawing steel |
| CN114908209B (en) * | 2022-04-02 | 2023-11-24 | 山西太钢不锈钢股份有限公司 | Method for improving surface quality of cold-rolled deep-drawing steel |
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Application publication date: 20201225 |