CN113198851A - Production method of hot-rolled pickled sheet of enamel steel - Google Patents
Production method of hot-rolled pickled sheet of enamel steel Download PDFInfo
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- CN113198851A CN113198851A CN202110290064.XA CN202110290064A CN113198851A CN 113198851 A CN113198851 A CN 113198851A CN 202110290064 A CN202110290064 A CN 202110290064A CN 113198851 A CN113198851 A CN 113198851A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 86
- 239000010959 steel Substances 0.000 title claims abstract description 86
- 210000003298 dental enamel Anatomy 0.000 title claims abstract description 71
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 47
- 238000005096 rolling process Methods 0.000 claims abstract description 33
- 239000002253 acid Substances 0.000 claims abstract description 13
- 238000005554 pickling Methods 0.000 claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims description 5
- 229910001567 cementite Inorganic materials 0.000 claims description 4
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 17
- 238000004880 explosion Methods 0.000 abstract description 13
- 239000000047 product Substances 0.000 abstract description 8
- 239000002244 precipitate Substances 0.000 abstract description 7
- 238000003723 Smelting Methods 0.000 abstract description 6
- 239000002245 particle Substances 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 238000009826 distribution Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000005098 hot rolling Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 13
- 241000251468 Actinopterygii Species 0.000 description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 9
- 229910052739 hydrogen Inorganic materials 0.000 description 9
- 239000001257 hydrogen Substances 0.000 description 9
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 238000009749 continuous casting Methods 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 229910052796 boron Inorganic materials 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010304 firing Methods 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000004534 enameling Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000005406 washing 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
- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- 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
-
- 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
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0071—Levelling the rolled product
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention belongs to the technical field of production of enamel steel, and particularly relates to a production method of an enamel steel hot-rolled pickled sheet. The method comprises the following steps: and (3) feeding the qualified smelted molten steel into a continuous casting-hot continuous rolling production line, reeling, and then carrying out acid pickling and leveling to obtain the enamel steel hot-rolled pickled sheet. The invention controls the smelting components, simultaneously adopts a continuous casting-hot continuous rolling and acid pickling leveling production line, optimizes the structure of the product, the shape and distribution of second-phase particle precipitates and the surface state of the hot-rolled acid pickling sheet of the enamel steel by the technologies of B microalloying, hot rolling, roughness control of acid pickling leveling working procedures and the like, thereby improving the stamping formability of the hot-rolled acid pickling sheet of the enamel steel, simultaneously meeting the requirement of the liner of a water heater on scale explosion resistance, and reducing the production cost by replacing the cold-rolled enamel plate with the hot-rolled acid pickling enamel plate.
Description
Technical Field
The invention belongs to the technical field of production of enamel steel, and particularly relates to a production method of an enamel steel hot-rolled pickled sheet.
Background
The enamel steel is a composite material combining ceramic materials and steel materials through high-temperature sintering, has the double characteristics of high strength, easy forming, corrosion resistance, wear resistance and attractive appearance of ceramic materials, and is widely applied to the industries of light industry, household appliances, metallurgy, chemical industry, building and the like. The processing and use characteristics of enamelled steel have strict requirements on the properties of enamelled steel: the steel has excellent formability, interference resistance, adhesion, fishscale resistance, pinhole resistance, strength and other required properties, wherein the formability and the fishscale resistance are two most important indexes of the steel for enamel.
In related research documents at home and abroad, a plurality of methods for producing enameled pressed steel are provided. For example, CN 201010179312.5 provides an enamel steel and its manufacturing method, which is a cold-rolled enamel steel sheet with excellent formability and anti-fishscaling performance obtained by adding a proper amount of alloy elements on the basis of ultra-low carbon, and its chemical components percentage is: less than or equal to 0.05 percent of C, less than or equal to 0.060 percent of Si, less than or equal to 0.50 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S, 0.031-0.10 percent of Al, less than or equal to 0.015 percent of N, more than or equal to 0.001 percent of O, 0.0003-0.020 percent of B, 0.01-0.50 percent of Cu, 0.01-0.10 percent of Nb, 0.01-0.10 percent of V, 0.01-0.15 percent of Ti, and one or more than or equal to 0.01-0.10 percent of Cr, 0.01-0.10 percent of Ni and 0.01-0.10 percent of Mo. The enamel steel manufactured by the method has good fish scaling resistance, but a plurality of alloy elements such as Nb, V, Ni, Ti, Cr and the like are added into the steel, so that the smelting cost is increased, and the production control difficulty is high.
CN 201310486400.3 discloses enamel steel with excellent fish scaling resistance and a manufacturing method thereof, wherein the enamel steel comprises, by weight, 0.0020-0.0050% of C, 0.30-0.50% of Mn, 0.0050-0.010% of Si, 0.01-0.015% of P, 0.011-0.020% of S, 0-0.010% of Alt and 0.011-0.020% of O, and the enamel steel adopts an ultra-low carbon steel component system, so that the difficulty of smelting process is high. CN 201510479731.3 discloses a boron-containing cold-rolled enamel steel suitable for continuous annealing production and a manufacturing method thereof, wherein the boron-containing cold-rolled enamel steel comprises the following chemical components in percentage by mass: 0.03-0.05% of C, less than or equal to 0.02% of Si, 0.20-0.40% of Mn, less than or equal to 0.020% of P, 0.020-0.035% of S, 0.0020-0.0060% of N, less than or equal to 0.010% of Alt, 0.0010-0.0020% of B and the balance of iron and inevitable impurities. The S content of the patent is higher and is required to be within the range of 0.020-0.035%, the S content is high, the continuous casting is easy to crack, and the continuous casting-hot continuous rolling production line is not suitable for the continuous casting-hot continuous rolling production line with high continuous casting and drawing speed and quick cooling. In addition, both of the two patents are only suitable for cold rolling of the enameled steel sheet, and need cold rolling and annealing, and have long production process and high cost.
The hot-rolled and acid-washed thin plate has good surface quality and low cost, can replace cold-rolled plates in many aspects, and has wide application prospect, but for the enamel steel, the structure in the steel is small, the product strength is higher, the formability is poor for low-carbon steel, especially low-carbon soft steel, the forming requirement of the enamel steel is difficult to meet, the structure control is poor, and the fishscale explosion defect after enamel appears, so that the cold-rolled enamel steel is difficult to replace. For example, CN201910697103.0 discloses a 260 MPa-level hot-rolled acid-washed enamel steel and a production method thereof, a CSP production line is adopted, and the hot-rolled acid-washed enamel steel finally produced is subjected to molten iron pretreatment, converter smelting, alloy fine adjustment, RH furnace refining, continuous casting and rolling, coiling and acid washing, wherein the yield strength is more than or equal to 260MPa, the tensile strength is more than or equal to 360MPa, and the elongation A50 is more than or equal to 30 percent, so that the method increases the cost caused by RH furnace refining, and the CSP casting blank is thin and has large specific surface area and poor surface quality; meanwhile, the yield strength of the obtained product is higher, and the yield ratio is high, so that the forming requirement of more complex enamel steel is difficult to meet.
Disclosure of Invention
Aiming at the problems of multiple types of cold-rolled enamel steel alloys, long flow, high cost, poor formability of a hot-rolled pickled sheet, poor fish scale resistance and the like in the prior art, the invention provides the production method of the hot-rolled enamel steel pickled sheet, which can improve the formability and the fish scale resistance of the hot-rolled enamel steel pickled sheet, reduce the cost and meet the production requirement of a water heater liner.
The invention is realized by the following technical scheme:
a production method of an enamelled steel hot-rolled pickled sheet comprises the following steps: and (3) feeding the qualified smelted molten steel into a continuous casting-hot continuous rolling production line, reeling, and then carrying out acid pickling and leveling to obtain the enamel steel hot-rolled pickled sheet.
Wherein the content of the first and second substances,
the finish rolling start temperature in the continuous casting-hot continuous rolling production line is 950-1100 ℃, and preferably 950-1050 ℃. When the finish rolling temperature is lower than 950 ℃, the load of a rolling mill is increased, the process temperature and the finish rolling temperature are low, and the uniformity of the hot-rolled pickled sheet is poor. Therefore, the initial rolling temperature of finish rolling is determined to be 950-1100 ℃, preferably 950-1050 ℃.
The final rolling temperature in the continuous casting-hot continuous rolling production line is 850-950 ℃, and preferably 890-920 ℃. The finish rolling temperature is one of main parameters for controlling the hot-rolled pickled sheet structure and the precipitation of second-phase particles, and is too low, so that mixed crystals can appear during rolling in a two-phase region, and the forming and the fish scaling resistance are not facilitated; the finishing temperature is too high, the crystal grains are coarse, the scale explosion resistance is poor, the process temperature is high, and the surface quality is poor due to severe oxidation burning loss. Therefore, the finishing rolling temperature is determined to be 850-950 ℃, and preferably 890-920 ℃.
The coiling temperature is 650-750 ℃. When the coiling temperature is lower than 650 ℃, the tissue is fine, so that the product has high strength and low elongation and is not beneficial to forming. But the coiling temperature is too high, the iron scale is increased, the surface quality is poor, and the bonding effect after enamel is poor. Therefore, the coiling temperature is limited to 650 to 750 ℃.
The flattening reduction rate is 0.50% -2.0%. The acid pickling leveling process can improve the plate shape and the surface structure of the steel plate, improve the oil storage capacity, reduce scratches in the forming process, increase the binding force to enamel, and eliminate a yield platform to facilitate stamping forming, so that certain leveling reduction rate is required to improve the plate shape and control the surface roughness.
The grain size of the enamel steel hot-rolled pickled sheet is 8-10 grade, the metallographic structure mainly comprises recrystallized ferrite and reticular cementite, and spherical BN, MnS and other second-phase precipitates are dispersed in the grain boundary and the crystal, so that the product structure is uniform, the second-phase precipitated particles are large, and the number of hydrogen traps is uniform.
The hot-rolled pickled enameled steel sheet comprises the following chemical components in percentage by weight: 0.030 to 0.050% of C, less than or equal to 0.060% of Si, 0.10 to 0.50% of Mn, less than or equal to 0.015% of P, 0.0030 to 0.010% of S, 0.0030 to 0.010% of N, 0.010 to 0.050% of Alt, 0.0010 to 0.0030% of B, and the balance of iron and inevitable impurities.
The function of the alloy elements in the invention is mainly based on the following principle:
c is one of the main control elements of the hot-rolled and pickled sheet of the enamel steel, and has important influence on the structure and the performance of the enamel steel. If the content of C is too high, the yield and tensile strength of the hot-rolled pickled sheet produced by continuous casting-hot continuous rolling are increased, and the formability of the hot-rolled pickled sheet is deteriorated; moreover, if the hot-rolled pickled sheet is decarburized to generate CO bubbles in the enameling firing process with higher C content, scale explosion may be generated; if too low, less cementite is obtained, the number of hydrogen traps is insufficient, and the fish scaling resistance is poor. Therefore, the content of C is required to be 0.030 to 0.050% in the present patent.
Si is a harmful element in enamel steel. On one hand, Si increases the strength of the hot-rolled pickled sheet due to solid solution and deteriorates the stamping of the material; an oxide film can be generated in the process of Si enameling on the other surface, and the adhesive force between the hot-rolled pickled sheet and the enamel is reduced. Therefore, the patent requires that the steel Si is less than or equal to 0.060%.
Mn is an element to be added to the hot-rolled and pickled sheet of enamel steel. A certain amount of Mn can form MnS particles with S to serve as a matrix of MnS-BN composite precipitates, the number of hydrogen traps is increased, and the method is favorable for improving the fishscale resistance. However, too high Mn content significantly reduces the plasticity of the steel, and is not favorable for the forming of the hot-rolled pickled sheet. Therefore, the content of Mn should be controlled within a range of 0.10 to 0.50%.
P is a segregation element. Too high content not only increases the strength of the hot-rolled pickled sheet and reduces formability, but also reduces weldability of steel due to cold brittleness; bubbles and black spots are easily generated during the enameling firing, and the surface quality of the enamel steel is influenced. Therefore, the patent requires that P is less than or equal to 0.015 percent.
Alt is a deoxidizing element. The enamel steel hot-rolled pickled sheet contains certain aluminum, which is beneficial to improving the fish scaling resistance; however, the poor plasticity of alumina inclusions deteriorates the formability of steel, and alumina affects the castability in the continuous casting process. Because the pouring speed of the continuous casting-hot continuous rolling production line is higher, Alt is required to be less than or equal to 0.050 percent for ensuring smooth production; but the hot-rolled and pickled sheet of the enamel steel with the Alt less than or equal to 0.010 percent has increased aging and reduced formability. Therefore, the Alt content needs to be controlled to be between 0.010 and 0.050 percent.
S and N in the traditional steel plate are harmful elements and need to be removed as much as possible, but in the enamel steel, a proper amount of S and N is beneficial to improving the scale explosion resistance of the hot-rolled pickled thin plate, the number of hydrogen traps can be increased, and the scale explosion of porcelain is reduced. BN adheres to MnS in the continuous casting process to form a coarse spherical composite precipitate serving as an irreversible hydrogen trap to enhance the anti-scaling capability of the enamel steel; however, if the contents of S and N are too high, the brittleness and strength of the hot-rolled and pickled sheet of enamel steel increase, edge crack is liable to occur during the production process, and the formability of the hot-rolled and pickled sheet is lowered. The content of S and N is required to be 0.0030-0.010%.
B is an element which is tried to be added in this patent. A trace amount of B is added into an enamel steel hot-rolled pickled sheet for B microalloying, B and N form BN, and a MnS-BN composite precipitate is formed on the B and N depending on the MnS precipitated firstly, so that a hydrogen trap is formed, the scale explosion resistance of a steel plate is improved, and a good effect can be achieved by adding a small amount of B into the steel; in addition, B and an alloying product thereof are precipitated at a ferrite grain boundary, so that an equiaxial ferrite structure is formed, and the formability is improved. When the content of B is too high, a slab crack is easily formed, which is not favorable for stable control. Therefore, the content of B is 0.0010 to 0.0030%.
The invention controls the smelting components, simultaneously adopts a continuous casting-hot continuous rolling and acid pickling leveling production line, optimizes the structure of the product, the shape and distribution of second-phase particle precipitates and the surface state of the hot-rolled acid-pickled enamel steel sheet by the technologies of B microalloying, low-temperature heating and high-temperature final rolling, roughness control of the leveling process and the like, thereby improving the stamping formability of the hot-rolled acid-pickled enamel steel sheet, simultaneously meeting the requirement of the liner of a water heater on scale explosion resistance, and reducing the production cost by replacing the cold-rolled enamel plate with the hot-rolled acid-pickled enamel plate.
The beneficial effect of the invention is that,
(1) after smelting, continuous casting, hot continuous rolling and acid pickling leveling, the structure and the second phase particle form of the enamel steel hot-rolled acid-pickled sheet are controllable, the number of hydrogen traps is large and uniform, and the forming performance and the fish scaling resistance of the hot-rolled acid-pickled sheet are improved;
(2) the yield strength Rel of the obtained enameled steel hot-rolled pickled sheet is 150-250 MPa, the tensile strength Rm is 280-350 MPa, the elongation A50 is more than or equal to 40%, the surface roughness Ra is 0.6-2.0 μm, and the forming of a water heater with a more complex model can be met;
(3) the performance phase and the surface quality of the enamel steel hot-rolled pickled sheet are equivalent to those of a cold-rolled product, the forming property is good, the fish scale resistance is good, the alloy addition amount is small, the cost is low, and the efficiency is high;
(4) the enamel steel hot-rolled pickled sheet can be processed into water heater liners of various shapes, and the forming effect is good; and after tests such as enamel firing, hydrogen permeation and the like, the enamel glaze has good adhesive force and scale explosion resistance, and no ceramic explosion phenomenon occurs in the whole test period.
Detailed Description
The invention is further described below with reference to specific examples so that a person skilled in the art may better understand the invention, but without thereby restricting the invention.
The production process of each example and comparative example comprises the steps of: and (3) feeding the qualified smelted molten steel into a continuous casting-hot continuous rolling mill through a tundish to obtain an enamel steel hot-rolled substrate, and finally carrying out acid pickling and leveling to obtain the enamel steel acid-pickled sheet.
The chemical compositions (mass percent) of the examples of the invention and the comparative examples are shown in table 1:
TABLE 1 chemical composition (mass percent)
| Numbering | C | Si | Mn | S | Alt | N | P | B |
| Example 1 | 0.050 | 0.030 | 0.10 | 0.004 | 0.010 | 0.010 | 0.015 | 0.0012 |
| Example 2 | 0.041 | 0.060 | 0.14 | 0.005 | 0.023 | 0.0089 | 0.012 | 0.0015 |
| Example 3 | 0.035 | 0.042 | 0.25 | 0.007 | 0.015 | 0.0045 | 0.014 | 0.0025 |
| Example 4 | 0.031 | 0.030 | 0.13 | 0.010 | 0.045 | 0.0035 | 0.010 | 0.0030 |
| Example 5 | 0.038 | 0.028 | 0.26 | 0.008 | 0.026 | 0.0075 | 0.006 | 0.0022 |
| Example 6 | 0.044 | 0.035 | 0.37 | 0.0032 | 0.0130 | 0.0060 | 0.013 | 0.0012 |
| Example 7 | 0.048 | 0.018 | 0.43 | 0.0035 | 0.025 | 0.0045 | 0.012 | 0.0019 |
| Example 8 | 0.045 | 0.006 | 0.50 | 0.0033 | 0.028 | 0.0032 | 0.017 | 0.0023 |
| Example 9 | 0.032 | 0.027 | 0.32 | 0.0095 | 0.020 | 0.0095 | 0.016 | 0.0028 |
| Comparative example 1 | 0.089 | 0.035 | 0.65 | 0.0032 | 0.0022 | 0.0023 | 0.032 | 0.0050 |
| Comparative example 2 | 0.042 | 0.13 | 0.06 | 0.015 | 0.95 | 0.0018 | 0.013 | 0.0006 |
| Comparative example 3 | 0.005 | 0.029 | 0.81 | 0.001 | 0.25 | 0.0024 | 0.015 | 0.0023 |
The main production process parameters of the inventive examples and comparative examples are shown in table 2:
TABLE 2 Main production Process parameters
| Serial number | Finish Rolling Start temperature (. degree. C.) | Finish Rolling temperature (. degree.C.) | Coiling temperature (. degree.C.) | Leveling reduction (%) |
| Example 1 | 950 | 855 | 690 | 1.0 |
| Example 2 | 965 | 860 | 680 | 1.5 |
| Example 3 | 1090 | 920 | 700 | 0.8 |
| Example 4 | 1050 | 945 | 695 | 2.0 |
| Example 5 | 920 | 890 | 705 | 1.3 |
| Example 6 | 970 | 860 | 690 | 0.5 |
| Example 7 | 990 | 880 | 730 | 0.75 |
| Example 8 | 1035 | 910 | 700 | 1.8 |
| Example 9 | 1040 | 920 | 660 | 1.0 |
| Comparative example 1 | 1200 | 1000 | 700 | 0.4 |
| Comparative example 2 | 900 | 740 | 550 | 1.3 |
| Comparative example 3 | 850 | 680 | 620 | 2.5 |
The mechanical properties of the examples and comparative examples of the present invention are shown in Table 3:
TABLE 3 mechanical Properties
| Serial number | Yield strength Rp0.2 (MPa) | Tensile Strength Rm (MPa) | Elongation A50 (%) | Yield ratio | Surface roughness Ra (mum) |
| Example 1 | 235 | 346 | 43 | 0.68 | 1.5 |
| Example 2 | 201 | 316 | 45 | 0.64 | 1.8 |
| Example 3 | 218 | 325 | 44 | 0.67 | 0.6 |
| Example 4 | 223 | 328 | 42 | 0.68 | 1.2 |
| Example 5 | 194 | 304 | 48 | 0.64 | 2.0 |
| Example 6 | 207 | 312 | 46 | 0.66 | 1.3 |
| Example 7 | 182 | 285 | 45 | 0.64 | 0.9 |
| Example 8 | 188 | 294 | 50 | 0.64 | 1.7 |
| Example 9 | 195 | 298 | 48 | 0.65 | 0.8 |
| Comparative example 1 | 302 | 421 | 36 | 0.72 | 0.3 |
| Comparative example 2 | 275 | 386 | 37 | 0.71 | 2.6 |
| Comparative example 3 | 268 | 369 | 39 | 0.73 | 1.2 |
The enamel steel hot-rolled pickled sheet can be processed into water heater liners of various shapes, and the forming effect is good; and after tests such as enamel firing, hydrogen permeation and the like, the enamel glaze has good adhesive force and scale explosion resistance, and no ceramic explosion phenomenon occurs in the whole test period.
As can be seen from the above examples, the yield strength Rel of the acid-washed enameled steel sheet produced by the invention is 150-250 MPa, the tensile strength Rm is 280-350 MPa, the elongation A50 is more than or equal to 40%, and the surface roughness Ra is 0.6-2.0 μm; the texture grain size of the enamel steel hot-rolled pickled sheet is mainly 8-10 grade uniform recrystallized ferrite and reticular cementite, and spherical BN, MnS and other second-phase precipitates are dispersed and distributed in grain boundaries and grains; the enamel steel hot-rolled pickled sheet produced by the components and the process has excellent mechanical property and surface quality, good stamping formability, less production processes and low cost, and simultaneously ensures the fish scale explosion resistance and the binding force with enamel.
Claims (9)
1. The production method of the enamel steel hot-rolled pickled sheet is characterized by comprising the following steps: and (3) feeding the qualified smelted molten steel into a continuous casting-hot continuous rolling production line, reeling, and then carrying out acid pickling and leveling to obtain the enamel steel hot-rolled pickled sheet.
2. The method for producing the hot-rolled pickled sheet of enamel steel as claimed in claim 1, wherein the finishing rolling temperature in the continuous casting-hot continuous rolling production line is 950 to 1100 ℃.
3. The production method of the enamel steel hot-rolled pickled sheet as claimed in claim 2, wherein the finishing rolling start temperature in the continuous casting-hot continuous rolling production line is 950-1050 ℃.
4. The method for producing the hot-rolled pickled enamelled steel sheet according to claim 1, wherein the finishing temperature in the continuous casting-hot continuous rolling line is 850-950 ℃.
5. The method for producing the hot-rolled pickled enamel steel sheet as claimed in claim 1, wherein the finishing temperature in the continuous casting-hot continuous rolling production line is 890-920 ℃.
6. The method for producing the hot-rolled and pickled enamel steel sheet as claimed in claim 1, wherein the coiling temperature is 650-750 ℃.
7. The method for producing the hot-rolled pickled enamel steel sheet as claimed in claim 1, wherein the rolling reduction is 0.50-2.0%.
8. The production method of the hot-rolled and pickled enamelled steel sheet according to claim 1, characterized in that it comprises the following chemical components in percentage by weight: 0.030 to 0.050% of C, less than or equal to 0.060% of Si, 0.10 to 0.50% of Mn, less than or equal to 0.015% of P, 0.0030 to 0.010% of S, 0.0030 to 0.010% of N, 0.010 to 0.050% of Alt, 0.0010 to 0.0030% of B, and the balance of iron and inevitable impurities.
9. The method for producing the hot-rolled and pickled enameled steel sheet as claimed in claim 8, wherein the grain size of the hot-rolled and pickled enameled steel sheet is 8-10 grade, and the metallographic structure is mainly recrystallized ferrite and network cementite.
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