CN111455259A - Hot-rolled pickled steel plate for electrogalvanizing and production method thereof - Google Patents
Hot-rolled pickled steel plate for electrogalvanizing and production method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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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- 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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B2001/225—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 plates, strips, bands or sheets of indefinite length by 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/004—Dispersions; Precipitations
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
The invention provides a hot-rolled pickled steel plate for electrogalvanizing and a production method thereof, and the hot-rolled pickled steel plate comprises the following components: c: 0.010-0.080%, less than or equal to 0.030% of Si, Mn: 010% -0.40%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, Al: 0.020-0.060%, N less than or equal to 0.0050%, and the balance of Fe and inevitable impurities. Compared with the prior art, the hot-rolled pickled steel plate for electrogalvanizing is produced by accurately controlling the components in the steel and through the working procedures of hot rolling, pickling and leveling. The yield strength of the hot-rolled pickled steel plate produced by the method is 200-50The elongation is more than or equal to 35 percent, the surface roughness Ra value is 0.6-1.5 mu m, the product thickness is 1.5-6.0mm, the product has good plate shape and surface quality, the surface color is uniform, and the electrogalvanizing requirement can be met.
Description
Technical Field
The invention belongs to the field of metal materials, relates to steel making, hot rolling, pickling and leveling processes of a metal plate (strip), and particularly relates to a hot-rolled pickled steel plate for electrogalvanizing and a production method thereof.
Background
The electro-galvanized steel plate has good corrosion resistance, processability, weldability and paintability, and is mainly used in the industries of automobiles, household appliances, electronics, light industry and the like. With the rapid development of automobile, household electrical appliance and electronic industries in China, the market of the electro-galvanized steel plate in China presents the situation of short supply and short demand. Due to the restriction of quality factors and the level of manufacturing process, the galvanized steel sheet products in China still need to be imported in large quantity. Due to the particularities of the electrogalvanizing process, good plate shape and surface quality of the substrate are required. Because the surface quality of the cold-rolled steel plate is better than that of the hot-rolled pickled steel plate, the substrate of the prior electro-galvanized steel plate is mainly the cold-rolled steel plate.
The domestic patent No. CN 102716905B reports a production method of a cold-rolled sheet for a surface-coated substrate, and the production method comprises the following steps: c is less than or equal to 0.12 percent, Si is less than or equal to 0.05 percent, Mn is less than or equal to 0.60 percent, P is less than or equal to 0.04 percent, S is less than or equal to 0.04 percent, and the balance is Fe, the steel billet of the components is subjected to hot rolling, acid pickling and cold rolling in sequence to obtain a cold-rolled steel coil, and then the cold-rolled sheet for the surface coating substrate is prepared by a continuous annealing or galvanizing method. The continuous annealing coated substrate and the galvanized coated substrate produced by the production method of the cold-rolled sheet for the surface coated substrate have excellent forming performance, excellent surface quality and excellent coating performance, and can be used as substrates of high-grade galvanized plates, color coated plates, tin-plated plates and aluminum-plated plates. The substrate produced in this patent that can be used for electrogalvanizing is a cold-rolled steel sheet.
Chinese patent publication No. CN 104805352A, "a production method of a cold-rolled steel sheet for electrogalvanizing", describes a production method of a deep-drawing cold-rolled steel sheet for electrogalvanizing, which comprises the following chemical components in percentage by mass: c is less than or equal to 0.005%, Si is less than or equal to 0.030%, Mn: 0.15-0.25%, P is less than or equal to 0.020%, S is less than or equal to 0.012%, Al: 0.030-0.055 percent, less than or equal to 0.0050 percent, and the balance of Fe and inevitable impurities, and the cold-rolled steel plate which has the yield strength of 150 plus 240MPa, the tensile strength of more than 270MPa, the elongation of more than 37 percent, can meet the deep drawing forming requirement, has good plate shape and surface quality (more than FC), and can meet the requirements of electro-galvanizing and subsequent passivation fingerprint-resistant treatment is obtained by accurately controlling the components of the steel and combining the corresponding production process. The substrate for electrogalvanizing in this patent is a cold-rolled steel sheet.
The electrogalvanizing substrate in the prior art is a cold-rolled steel plate, and has long production flow and high cost.
Disclosure of Invention
The invention aims to provide a hot-rolled pickled steel plate for electrogalvanizing, which has the surface quality of more than FB and uniform surface color and luster and can meet the requirements of electrogalvanizing; and the production flow is short, and the cost is advantageous.
The invention also aims to provide a production method of the hot-rolled pickled steel plate for electrogalvanizing, which is characterized in that the hot-rolled pickled steel plate for electrogalvanizing with the surface quality of FB or more, the yield strength of 200-300MPa, the tensile strength of 320-440MPa, the elongation of A50 of more than or equal to 35 percent and the surface roughness Ra value of 0.6-1.5 mu m is obtained by reasonable chemical composition design and matching with hot rolling, pickling and leveling processes, and the surface color is uniform, so that the requirement of subsequent electrogalvanizing can be met.
The specific technical scheme of the invention is as follows:
a hot-rolled pickled steel plate for electrogalvanizing comprises the following chemical components in percentage by weight:
in order to ensure the surface quality and the mechanical property of the hot-rolled pickled steel plate for electrogalvanizing, the steel plate mainly comprises the following components in percentage by weight: 0.010-0.080%, less than or equal to 0.030% of Si, Mn: 0.10-0.40%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, Al: 0.020-0.060%, N less than or equal to 0.0050%, and the balance of Fe and inevitable impurities. To be based on the following principle:
carbon (C): c is the most economical and effective solid solution strengthening element for improving strength, and the content of C increases, and the strength increases, but the plasticity and formability of the steel decrease. Therefore, in the consideration of economy and comprehensive performance, the control range of the percentage content of C in the invention is controlled to be below 0.010 percent to 0.080 percent.
Silicon (Si): the Si content is too high, the iron scale on the surface of the steel plate is not easy to remove, microcracks generated by oxide pressing are easily formed on the surface, and meanwhile, the oxide of the silicon hinders the electrogalvanizing reaction and influences the surface quality of the electrogalvanized steel plate, so the control range of the Si percentage content is less than or equal to 0.030%.
Manganese (Mn): mn can reduce the phase transition temperature of austenite transformed into ferrite, and is beneficial to refining ferrite grains; however, the Mn content is too high, the Mn segregation degree of a casting blank is increased in the continuous casting process, pearlite or bainite banded structures are easily formed at the central part of the thickness of the steel plate, and the high-strength steel is easily subjected to layering defects due to the banded structures; meanwhile, the Mn-Mn alloy is also a crack initiation point of fatigue failure, is unfavorable for plasticity, welding performance, fatigue performance and electrogalvanizing surface quality, and comprehensively considers that the percentage content control range of Mn in the invention is 0.10-0.40%.
P has a low diffusion rate in gamma-Fe and α -Fe, is likely to form segregation, and is not favorable for the formability, low-temperature impact toughness and weldability of steel sheets, so that the percentage of P in the steel is controlled to 0.015% or less.
Sulfur (S): s is a harmful element under normal conditions, causes hot brittleness of steel, reduces ductility and toughness of the steel, causes cracks during forging and rolling, influences surface quality of the electro-galvanized steel plate, and requires the content of S to be as low as possible, so the S percentage content of the steel grade is controlled to be below 0.010 percent.
Aluminum (Al): al is used as a main deoxidizer, and meanwhile, aluminum also has a certain effect on grain refinement. Aluminum has the disadvantage of affecting the hot workability, weldability and machinability of the steel. The invention controls the control range of the percentage content of Al to be 0.020-0.060%.
Nitrogen (N): n can improve the strength, low-temperature toughness and weldability of steel and increase aging sensitivity. The invention controls the N percentage content of the steel grade below 0.0050%.
The invention provides a production method of a hot-rolled pickled steel plate for electrogalvanizing, which comprises the following steps:
1) pretreating molten iron;
2) smelting in a converter;
3) an alloy fine tuning station;
4) RH furnace refining
5) Continuous casting;
6) heating a casting blank;
7) hot rolling, laminar cooling and coiling;
8) acid washing;
8) and (7) flattening.
In the step 1), the molten iron pretreatment requires pre-slagging and post-slagging, so that the sulfur content is reduced, and the purity of the molten steel is improved.
Step 2) converter smelting: no pig iron or slag steel is added; self-circulation steel scrap tapping is adopted, converter dephosphorization is enhanced, and slag blocking operation is enhanced; lime is added in the tapping process, deoxidation is not carried out, and the cleanliness of molten steel is further improved.
Step 3) an alloy fine-tuning station: modifying the ladle top slag and reducingLess Al in steel2O3And (4) inclusion.
Step 4) RH furnace refining: RH adopts light treatment process, if oxygen is required to be blown, oxygen is blown in the early and middle stages according to temperature and oxygen level; the net circulation time is ensured to be not less than 6min before breaking, and the generation of inclusions is reduced.
And 5) continuous casting, wherein the target temperature of the tundish is controlled to be 20-40 ℃ above the liquidus temperature, the temperature of molten steel is too high, the ① crystallizer blank shell is thin and easy to leak steel, ② refractory material erosion is accelerated and easily causes casting flow to be out of control, casting safety is reduced, ③ nonmetal inclusions are added to influence the internal quality of a plate blank, ④ center segregation is aggravated and easily causes center line cracks, ① is easy to block a water gap and stop casting due to too low temperature of the molten steel, defects such as blister, slag inclusion, cracks and the like are easily generated on the continuous casting surface of ②, and ③ nonmetal inclusions are not easy to float upwards and influence the quality of a casting blank.
Step 6), heating a casting blank: the casting blank is scalped, the discharging temperature of the casting blank is controlled to be 1200-1230 ℃, the time in the furnace is 180-240 min, the discharging temperature is too low, the final rolling temperature cannot be ensured, the discharging temperature is too high, the iron scale is pressed seriously during rolling, the time in the furnace is too short, the crystal grains are not uniform, the time in the furnace is too long, and the surface iron scale is more.
Step 7) hot rolling step: and (4) high-pressure descaling at the hot rolling rough rolling inlet and outlet, feeding the hot rolling finish rolling inlet into an edge heater, and fully opening the high-pressure descaling water at the finish rolling inlet and outlet. The press-in of the iron scale on the surface of the hot rolled steel plate is reduced, and the surface quality is improved.
The finishing temperature is controlled to be 880-920 ℃. In order to avoid the rolling in the two-phase region, the finishing temperature cannot be too low.
And the later-stage laminar cooling is adopted, the coiling temperature is controlled to be 560-600 ℃, and the coiling temperature is too high or too low, so that the mechanical property or the surface quality of a finished product is difficult to ensure, and the surface of the rolled coil is high in oxide scale at high coiling temperature. In order to realize good surface quality and stable mechanical property of the product, the content of C in chemical components of the product and the hot rolling coiling temperature T in the production processjThe matching relationship is as follows: 0 to (Tj-550)/10 to 5000C to 1.
Further, the hot rolling crown C40 is controlled to be 0-0.050mm, and the wedge shape is controlled to be 0-0.030mm, so that the same plate difference of a finished product is reduced.
Step 8) pickling, wherein the temperature of the acid liquor is controlled to be 65-75 ℃, the concentration of the acid liquor is controlled to be 160-160 g/L, the pickling speed is 80-120mpm, the concentration of the pickling inhibitor is 0.5-3%, and the control of the concentration of the acid liquor and the pickling speed can prevent the surface of the steel plate from being over-pickled or under-pickled.
Step 9), leveling: the flattening elongation is 0.4-2.0%, and the surface roughness Ra value of the working roll of the flattening machine is controlled to be 0.7-1.0 μm. The flattening process can improve the surface uniformity of the steel plate and optimize the shape of the steel plate. In order to give consideration to the shape, mechanical property and surface quality of the product, the relationship among the content of C in the product, the flat elongation and the thickness H (unit mm) of the product is as follows: when the content of C is more than or equal to 0.010 percent and C is less than 0.045 percent, the relation between the product thickness H and the flat elongation is as follows: h is more than or equal to 1.5 and less than 2.5, and the leveling elongation is 1.8-2.0%; h is more than or equal to 2.5 and less than 3.5, and the leveling elongation is 1.6-1.8%; h is more than or equal to 3.5 and less than 4.5, and the leveling elongation is 1.4-1.6%; h is more than or equal to 4.5 and less than or equal to 6.0, and the leveling elongation is 1.2-1.4%; when the C content is more than or equal to 0.045% and less than or equal to 0.080%, the relation between the product thickness H and the flat elongation is as follows: h is more than or equal to 1.5 and less than 2.5, and the leveling elongation is 1.0-1.2%; h is more than or equal to 2.5 and less than 3.5, and the leveling elongation is 0.8-1.0%; h is more than or equal to 3.5 and less than 4.5, and the leveling elongation is 0.6-0.8%; h is more than or equal to 4.5 and less than or equal to 6.0, and the leveling elongation is 0.4-0.6%.
The thickness of the cold-rolled steel plate for electrogalvanizing is generally less than 3.0mm, and the thickness range of the hot-rolled pickled steel plate for electrogalvanizing is 1.5-6.0mm, so that the hot-rolled pickled steel plate for electrogalvanizing can be used for producing thick electrogalvanized steel plates. Compared with a cold-rolled steel plate for electrogalvanizing, the hot-rolled pickled steel plate for electrogalvanizing has the advantages of short production flow and cost advantage. The hot-rolled pickled steel plate for electrogalvanizing has poor surface uniformity, obvious surface color difference after electrogalvanizing and can not meet the requirement of electrogalvanizing.
Compared with the prior art, the hot-rolled pickled steel plate for electrogalvanizing is produced by accurately controlling the components in the steel and through the working procedures of hot rolling, pickling and leveling. The yield strength of the hot-rolled pickled steel plate produced by the method is 200-50The elongation is more than or equal to 35 percent, the surface roughness Ra value is 0.6-1.5 mu m, the product thickness is 1.5-6.0mm, the product has good plate shape and surface quality, the surface color is uniform, and the electrogalvanizing requirement can be met.
Drawings
FIG. 1 is a hot rolled pickled steel electrogalvanized front surface according to example 2 of the present invention;
FIG. 2 is the surface of hot-rolled pickled steel electrogalvanized in example 2 of the present invention;
FIG. 3 shows the metallographic structure of hot-rolled pickled steel in example 2 of the present invention.
Detailed Description
The patent is specifically illustrated by examples according to the chemical composition, hot rolling, pickling, and leveling process requirements of the hot rolled pickled steel sheet for electrogalvanizing in the invention.
Example 1 to example 3
A hot-rolled pickled steel sheet for electrogalvanizing, the chemical composition of molten steel is shown in Table 1, and the balance is Fe and inevitable impurity elements.
Comparative examples 1 to 2
A hot-rolled pickled steel sheet for electrogalvanizing, the chemical composition of molten steel is shown in Table 1, and the balance is Fe and inevitable impurity elements.
Table 1 chemical composition in wt% for each example and comparative example
| C | Si | Mn | P | S | Als | N | |
| Example 1 | 0.010 | 0.010 | 0.34 | 0.012 | 0.008 | 0.058 | 0.0035 |
| Example 2 | 0.047 | 0.007 | 0.18 | 0.007 | 0.004 | 0.035 | 0.0029 |
| Example 3 | 0.073 | 0.014 | 0.12 | 0.005 | 0.007 | 0.027 | 0.0047 |
| Comparative example 1 | 0.100 | 0.050 | 0.5 | 0.010 | 0.006 | 0.033 | 0.0022 |
| Comparative example 2 | 0.056 | 0.200 | 1.0 | 0.050 | 0.024 | 0.056 | 0.0078 |
The production method of the hot rolled pickled steel sheet for electrogalvanizing of the above examples and comparative examples includes the steps of:
in the step 1), the molten iron pretreatment requires pre-slagging and post-slagging, so that the sulfur content is reduced, and the purity of the molten steel is improved.
Step 2) converter smelting: no pig iron or slag steel is added; self-circulation steel scrap tapping is adopted, converter dephosphorization is enhanced, and slag blocking operation is enhanced; lime is added in the tapping process, deoxidation is not carried out, and the cleanliness of molten steel is further improved.
Step 3) an alloy fine-tuning station: modifying the top slag of the ladle to reduce Al in the steel2O3And (4) inclusion.
Step 4) RH furnace refining: RH adopts light treatment process, if oxygen is required to be blown, oxygen is blown in the early and middle stages according to temperature and oxygen level; the net circulation time is ensured to be not less than 6min before breaking, and the generation of inclusions is reduced.
Step 5) continuous casting: the target temperature of the tundish is controlled to be 20-40 ℃ above the liquidus temperature;
step 6), heating a casting blank: peeling off the casting blank, controlling the discharging temperature of the casting blank to be 1200-1230 ℃, and keeping the time in the furnace for 180-240 min;
step 7) hot rolling step: and (4) high-pressure descaling at the hot rolling rough rolling inlet and outlet, feeding the hot rolling finish rolling inlet into an edge heater, and fully opening the high-pressure descaling water at the finish rolling inlet and outlet. The press-in of the iron scale on the surface of the hot rolled steel plate is reduced, and the surface quality is improved.
The finishing temperature is controlled to be 880-920 ℃.
Adopting the laminar flow of the rear section for cooling, and controlling the coiling temperature to be 560-600 ℃;
further, the hot rolling crown C40 is controlled to be 0-0.050mm, and the wedge shape is controlled to be 0-0.030mm, so that the same plate difference of a finished product is reduced.
Step 8) pickling, wherein the temperature of the acid liquor is controlled to be 65-75 ℃, the concentration of the acid liquor is controlled to be 160-160 g/L, the pickling speed is 80-120mpm, the concentration of the pickling inhibitor is 0.5-3%, and the control of the concentration of the acid liquor and the pickling speed can prevent the surface of the steel plate from being over-pickled or under-pickled.
Step 9), leveling: the flattening elongation is 0.4-2.0%, and the surface roughness Ra value of the working roll of the flattening machine is controlled to be 0.7-1.0 μm. The flattening process can improve the surface uniformity of the steel plate and optimize the shape of the steel plate.
In the production process of the hot-rolled pickled steel plate for electrogalvanizing of the above examples and comparative examples, the main process parameters, final mechanical properties and surface quality were determined as shown in table 2. As can be seen from FIGS. 1 to 2, the hot rolled steel sheet of the present invention has good surface quality before and after electrogalvanizing.
TABLE 2 mechanical properties of the production process and products of the examples and comparative examples
As can be seen from the above examples, the hot rolled pickled steel plate for electrogalvanizing produced by the invention has the thickness specification of 1.5-6.0mm, the yield strength of 200-50The elongation is more than or equal to 35 percent, the surface roughness Ra value is 0.6-1.5 mu m, the product thickness is 1.5-6.0mm, and the product has good plate shape and surface quality and can meet the requirements of electrogalvanizing.
As shown in FIG. 3, the hot-rolled pickled steel sheet for electrogalvanizing obtained by the above process steps has a structure mainly comprising ferrite + carbide, and the ferrite proportion is 95% or more. The grain size is 9.0-10.0 grade. The hot rolling finish rolling inlet is thrown into the edge heater strip steel, the structure in the width direction is more uniform, and therefore the performance of the steel plate is more stable. The inclusion is controlled in steel making, the temperature of a heating furnace is matched with the heating time, high-pressure water at the inlet and the outlet of a hot rolling mill is used for removing phosphorus to reduce the pressing-in of iron oxide on the hot rolling surface, the acid pickling and leveling processes are reasonable, the surface quality of a finished product is improved, the surface quality of the finished product is above FB, and the surface color is uniform.
The above description is only for specific exemplary description of the present invention, and it should be noted that the specific implementation of the present invention is not limited by the above manner, and it is within the protection scope of the present invention as long as various insubstantial modifications are made by using the technical idea and technical solution of the present invention, or the technical idea and technical solution of the present invention are directly applied to other occasions without modifications.
Claims (10)
1. The hot-rolled pickled steel plate for the electrogalvanizing is characterized by comprising the following chemical components in percentage by weight: c: 0.010-0.080%, less than or equal to 0.030% of Si, Mn: 0.10-0.40%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, Al: 0.020-0.060%, N less than or equal to 0.0050%, and the balance of Fe and inevitable impurities.
2. A method for producing a hot rolled pickled steel sheet for electrogalvanizing according to claim 1, characterized by comprising the steps of:
1) pretreating molten iron;
2) smelting in a converter;
3) an alloy fine tuning station;
4) RH furnace refining
5) Continuous casting;
6) heating a casting blank;
7) hot rolling, laminar cooling and coiling;
8) acid washing;
8) and (7) flattening.
3. The production method according to claim 2, characterized in that step 5) continuous casting: the target temperature of the tundish is controlled to be 20-40 ℃ above the liquidus temperature.
4. The production method according to claim 2, wherein step 6) the strand is heated: the discharging temperature of the casting blank is controlled to be 1200-1230 ℃, and the furnace time is 180-240 min.
5. The production method according to claim 2, wherein in the step 7) hot rolling step: the finishing temperature is controlled to be 880-920 ℃.
6. The production method according to claim 2, wherein the coiling temperature is controlled to 560 ℃ to 600 ℃.
7. The production method according to claim 2, wherein step 9) levels: the flat elongation is 0.4-2.0%.
8. The production method according to claim 8, characterized in that: when the content of C is more than or equal to 0.010 percent and C is less than 0.045 percent, the relation between the product thickness H and the flat elongation is as follows: h is more than or equal to 1.5 and less than 2.5, and the leveling elongation is 1.8-2.0%; h is more than or equal to 2.5 and less than 3.5, and the leveling elongation is 1.6-1.8%; h is more than or equal to 3.5 and less than 4.5, and the leveling elongation is 1.4-1.6%; h is more than or equal to 4.5 and less than or equal to 6.0, and the leveling elongation is 1.2-1.4%; when the C content is more than or equal to 0.045% and less than or equal to 0.080%, the relation between the product thickness H and the flat elongation is as follows: h is more than or equal to 1.5 and less than 2.5, and the leveling elongation is 1.0-1.2%; h is more than or equal to 2.5 and less than 3.5, and the leveling elongation is 0.8-1.0%; h is more than or equal to 3.5 and less than 4.5, and the leveling elongation is 0.6-0.8%; h is more than or equal to 4.5 and less than or equal to 6.0, and the leveling elongation is 0.4-0.6%.
9. The production method as claimed in claim 2, wherein the acid solution temperature in the acid washing step 8) is controlled to 65-75 ℃, the acid solution concentration is controlled to 120-160 g/L, the acid washing speed is 80-120mpm, and the acid washing inhibitor concentration is 0.5-3%.
10. The production method according to claim 2, wherein the surface roughness Ra of the work roll of the leveler is controlled to be 0.7 to 1.0 μm.
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| CN112264469A (en) * | 2020-09-04 | 2021-01-26 | 武汉钢铁有限公司 | Method for reducing filiform spot defect on surface of electro-galvanized plate |
| CN112593143A (en) * | 2020-10-28 | 2021-04-02 | 邯郸钢铁集团有限责任公司 | 800 MPa-grade low-cost steel for pickling battery bracket and production method thereof |
| CN113025909A (en) * | 2021-03-09 | 2021-06-25 | 马鞍山钢铁股份有限公司 | Hot-rolled pickled plate for refrigerator compressor shell and production method thereof |
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| CN112264469A (en) * | 2020-09-04 | 2021-01-26 | 武汉钢铁有限公司 | Method for reducing filiform spot defect on surface of electro-galvanized plate |
| CN114182182A (en) * | 2020-09-14 | 2022-03-15 | 上海梅山钢铁股份有限公司 | Hot-rolled pickled steel plate for refrigerator compressor shell and manufacturing method thereof |
| CN112593143A (en) * | 2020-10-28 | 2021-04-02 | 邯郸钢铁集团有限责任公司 | 800 MPa-grade low-cost steel for pickling battery bracket and production method thereof |
| CN112593143B (en) * | 2020-10-28 | 2022-03-25 | 邯郸钢铁集团有限责任公司 | 800 MPa-grade low-cost steel for pickling battery bracket and production method thereof |
| CN113025909A (en) * | 2021-03-09 | 2021-06-25 | 马鞍山钢铁股份有限公司 | Hot-rolled pickled plate for refrigerator compressor shell and production method thereof |
| CN113145642A (en) * | 2021-04-01 | 2021-07-23 | 首钢京唐钢铁联合有限责任公司 | Pickling plate and preparation method thereof |
| CN114101324A (en) * | 2021-10-29 | 2022-03-01 | 马鞍山钢铁股份有限公司 | Inorganic self-lubricating galvanized steel strip for automobile and production method thereof |
| CN114101324B (en) * | 2021-10-29 | 2023-08-25 | 马鞍山钢铁股份有限公司 | Inorganic self-lubricating galvanized steel strip for automobile and production method thereof |
| CN114643279A (en) * | 2022-01-29 | 2022-06-21 | 安阳钢铁股份有限公司 | Method for controlling shape of ultrathin ultra-wide steel strip for continuous galvanizing |
| CN115094343A (en) * | 2022-05-26 | 2022-09-23 | 安阳钢铁集团有限责任公司 | Ultrathin wide-width high-strength continuous hot-dip galvanized steel for household appliances and production method thereof |
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