CN110284070B - 260 MPa-level hot-rolled acid-washed enamel steel and production method thereof - Google Patents
260 MPa-level hot-rolled acid-washed enamel steel and production method thereof Download PDFInfo
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- CN110284070B CN110284070B CN201910697103.0A CN201910697103A CN110284070B CN 110284070 B CN110284070 B CN 110284070B CN 201910697103 A CN201910697103 A CN 201910697103A CN 110284070 B CN110284070 B CN 110284070B
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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
- 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
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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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- 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
- C21D2211/002—Bainite
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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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- 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
- C21D2211/009—Pearlite
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Abstract
The invention discloses 260 MPa-level hot-rolled acid-washed enamel steel and a production method thereof, wherein the production method comprises the following steps: the method comprises the following steps of molten iron pretreatment, converter smelting, alloy fine adjustment, RH furnace refining, continuous casting and rolling, coiling and acid pickling. The hot-rolled acid-washing enamel steel produced by reasonable chemical composition design and matching with steel making, thin slab continuous casting and rolling (CSP process) and acid washing process has yield strength of more than or equal to 260MPa, tensile strength of more than or equal to 360MPa and elongation A50The enamel coating performance is more than or equal to 30 percent, the enamel coating performance is excellent, the economy is higher, and the production requirement of the water heater liner can be met.
Description
Technical Field
The invention belongs to the technical field of hot-rolled acid-washed enamel steel, and particularly relates to 260 MPa-level hot-rolled acid-washed enamel steel and a production method thereof.
Background
Along with the improvement of the production level of domestic steel mills and the increase of the cost reduction pressure of downstream users, the 'hot zone cooling' is more and more emphasized by the household appliance industry. Taking a water heater as an example, the proportion of the enamel steel hot-rolled pickled plate special for the liner is gradually increased.
At present, the enamel steel produced by steel plants in China mostly adopts a hot rolling production mode under the traditional slab continuous casting process, the basic process of the traditional continuous casting and rolling is to continuously cast molten steel into slabs with the thickness of 200-.
Disclosure of Invention
The invention aims to provide 260 MPa-level hot-rolled acid-pickled enamel steel and a production method thereof, wherein the yield strength of a hot-rolled acid-pickled plate (strip) produced by matching with steel making, thin slab continuous casting and rolling (CSP process) and acid pickling process of a steel plate (strip) is more than or equal to 260MPa, the tensile strength is more than or equal to 360MPa, and the elongation A is50The enamel coating performance is more than or equal to 30 percent, the enamel coating performance is excellent, the economy is higher, and the production requirement of the water heater liner can be met.
The technical scheme adopted by the invention is as follows:
a production method of 260 MPa-level hot-rolled pickled enamel steel comprises the following steps: molten iron pretreatment, converter smelting, alloy fine adjustment, RH furnace refining, continuous casting and rolling, coiling and acid washing; in the continuous casting and rolling process, the thickness of a billet before rolling is controlled to be 65mm-90mm, and the thickness of a thin slab is much thinner than that of a conventional slab in order to ensure that the critical thickness of a casting blank directly entering a finishing mill set from a rough rolling frame is omitted.
Further, in the step of pretreating the molten iron: the molten iron before entering the converter for smelting is treated by removing impurity elements, including desiliconization, desulfurization and dephosphorization of the molten iron, so that the purity of the molten iron is improved.
In the converter smelting step: oxygen is blown in and the high-temperature molten iron undergoes an oxidation reaction to remove impurities.
Alloy fine adjustment station steps: and (3) bottom blowing argon to the ladle to accelerate the movement of molten steel medium, promote the uniform distribution of molten steel components and temperature, reduce the impurities of the molten steel through chemical reaction and clean the molten steel.
In the RH furnace refining step: the RH treated molten steel has obvious advantages that the alloy basically does not react with slag, the alloy is directly added into the molten steel, and the yield is high; molten steel can be quickly and uniformly mixed; the alloy composition can be controlled within a narrow range; the gas content is low, the inclusion is few, and the molten steel purity is high; the top lance can also be used for carrying out temperature adjustment of chemical temperature rise, and molten steel which has good fluidity and high purity and meets the casting temperature is provided for the continuous casting machine, so that the multi-furnace continuous casting of continuous casting production is facilitated.
In the continuous casting and rolling step, the heating temperature of the steel plate before rolling is controlled to be 1100-1300 ℃, and when the steel plate is rolled, if the temperature of the steel plate is lower than 1100 ℃, mixed crystals appear in the internal tissues of the hot-rolled coil; if the temperature is higher than 1300 ℃, the internal structure of the surface of the steel coil is abnormally thick and the surface iron oxide scale defect is serious; the finishing temperature is controlled between 850 ℃ and 910 ℃, and the finishing temperature is higher than Ar3The mixed crystal structure of the steel coil is avoided; but the finishing temperature cannot be higher than 910 ℃, otherwise, the tendency of grain aggregation and growth is stronger, and the grain size of the obtained steel coil is thicker.
In the continuous casting and rolling step, a laminar cooling mode is adopted for cooling, cooling water clings to the surface of the strip steel and makes macroscopic motion in a certain direction, the cooling water is continuously updated, a large amount of heat is taken away to achieve the cooling purpose, and the cooling effect is good.
In the coiling step, the coiling temperature is controlled to be 600-700 ℃, and the coiling temperature can control the grain diameter of the hot-rolled strip steel and the amount and the form of precipitates.
In the pickling step, the concentration of free acid in a pickling solution is 90-150 g/L, the concentration is too low, the steel plate is not pickled, and residual iron scales are on the surface; the concentration is too high, and the surface of the steel plate is easy to be washed by acid; the temperature of the acid liquor is 70-90 ℃, the temperature is too low, and the steel plate is not subjected to acid cleaning; the temperature is too high, the hydrochloric acid volatilizes too fast, and the production environment is polluted.
Further, the heating temperature of the steel plate before rolling is preferably controlled to be 1132-1212 ℃; the finishing temperature is preferably controlled to be 881-890 ℃; the coiling temperature is preferably controlled to be 687-696 ℃.
The concentration of free acid in the pickling solution is preferably 105-119 g/L; the temperature of the acid liquor is preferably 71.4-74 ℃.
The invention also provides 260 MPa-grade hot-rolled acid-washed enamel steel prepared by the production method, and the 260 MPa-grade hot-rolled acid-washed enamel steel comprises the following chemical components in percentage by weight: c: 0.030-0.060%, Si is not more than 0.030%, Mn: 0.30-0.60%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, Als: less than or equal to 0.060 percent, B: 0.0015-0.0040%, N: 0.0040-0.0100% and the balance of Fe and inevitable impurity elements.
Further, the 260 MPa-grade hot-rolled and acid-washed enameled steel preferably comprises the following chemical components in percentage by weight: c: 0.032-0.040%, Si is less than or equal to 0.009%, Mn: 0.30-0.42%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, Als: 0.035-0.051%, B: 0.0017-0.0022%, N: 0.0069-0.0088%, and the balance of Fe and inevitable impurity elements.
The function of the alloy elements in the invention is mainly based on the following principle:
c: c is the most economical and effective solid solution strengthening element for improving the strength, the content of C is increased, the formed pearlite is increased, the strength is increased, but the plasticity and the formability of the steel are reduced, the content of C is too high, the pinhole defect is easy to occur in the enameling firing process, and the percentage content of C in the invention is controlled within the range of 0.030-0.060%, preferably 0.032-0.040%.
Si: the Si content is too high, the iron scale on the surface of the steel plate is not easy to remove, and the percentage content control range of the Si in the invention is less than or equal to 0.030 percent, and preferably less than or equal to 0.009 percent.
Mn: mn is an effective element for strengthening and toughening a welding seam, and is beneficial to deoxidation in the welding seam, but the Mn content is too high, the Mn segregation degree of a casting blank is increased in the continuous casting process, and the plasticity, the welding performance and the fatigue performance are not good. The percentage content of Mn in the invention is controlled within the range of 0.30-0.60%, preferably 0.30-0.42%.
P: p increases the cold brittleness of the steel, deteriorates the welding properties, decreases the plasticity, and deteriorates the cold bending properties. In the invention, the percentage content of P is controlled to be less than 0.020%, and is preferably less than or equal to 0.015%.
S: large-size manganese sulfide is formed, and the low-temperature impact toughness and the enameling adhesion performance of weld metal are also influenced by sulfide in steel. The percentage content of S in the invention is controlled below 0.010%.
Al: al is a main deoxidizer and can suppress the formation of other oxides, but the shape of alumina is poor and a large amount of alumina inclusions impair the workability of the steel sheet. The percentage content of Al in the invention is controlled below 0.060%, preferably 0.035-0.051%.
B: BN can obviously increase the number of hydrogen traps in the enamel steel at the crystal boundary and the phase boundary, and the enamel performance of the steel plate is improved. The B element has rich resources and low price. Although the element B plays a beneficial role in steel, if the content of B is too high, cracks are easily generated in the cast strand during the continuous casting. The percentage content control range of B in the invention is 0.0015-0.0040%, preferably 0.0017-0.0022%.
N: n is a solid solution element, and the compound BN is beneficial to improving the scale explosion resistance of the steel. If the amount of nitride formed is too high, the plasticity of the steel is seriously impaired. The percentage content control range of N in the invention is 0.0040-0.0100%, preferably 0.0069-0.0088%.
The metallographic structure of the 260 MPa-grade hot-rolled and acid-washed enamel steel is ferrite, pearlite and bainite, and the grain size grade is 9.5 grade.
The yield strength of the 260 MPa-level hot-rolled acid-washed enamel steel is more than or equal to 260MPa, the tensile strength is more than or equal to 360MPa, and the elongation rate A is50More than or equal to 30 percent, and after the steel plate is enameled on a single-side by a one-time wet method, the surface does not generate fish scale explosion.
Compared with the prior art, the hot-rolled acid-pickling enamel steel suitable for the liner of the water heater with the grade of 260MPa is obtained by reasonable component design and avoiding adding expensive alloy components in the components, the production cost is reduced, and the parameters in the processes of continuous casting, continuous rolling and acid pickling of the thin slab are controlled, so that the hot-rolled acid-pickling enamel steel has higher economy.
Drawings
FIG. 1 is the surface of a glaze layer of hot-rolled enameled steel in example 1;
FIG. 2 is a surface of a hot-rolled enamel steel glaze layer in comparative example 3;
FIG. 3 is a 100-fold metallographic structure diagram of hot-rolled enamel steel in example 1;
FIG. 4 is a 500-fold metallographic structure chart of the hot-rolled enamel steel in example 1.
Detailed Description
The patent is specifically explained by examples according to the chemical composition of the enamel steel, the continuous casting and rolling of the thin slab and the acid pickling process requirements.
The chemical compositions (mass percentages) of the examples and comparative examples of the present invention are shown in table 1, and the balance is Fe and inevitable impurity elements: example 1/2/3/4 use the CSP process, the composition meets the design values for the present invention; the comparative example adopts the CSP process, the C, Mn content in the steel making of the comparative example 1/2 is lower, and the N blowing process is not carried out in the steel making of the comparative example 3/4, and the B element is not added.
Table 1 examples chemical composition, wt.%
The control of important process parameters during the production of the examples and comparative examples is shown in Table 2
TABLE 2 production Process parameters
The mechanical properties of the examples and comparative examples of the present invention are shown in Table 3: the mechanical properties of example 1/2/3/4 and comparative example 3/4 were satisfactory; comparative example 1/2 has a low mechanical property and is unsatisfactory.
TABLE 3 mechanical Properties of the products
Adopting a wet single-sided one-time enameling process, preserving heat at 860 ℃ for 10min, naturally cooling, and standing for 24h, wherein the results are shown in Table 4: the glaze layers of the example 1/2/3/4 and the comparative example 1/2 have no surface scale explosion, and the glaze layer of the comparative example 3/4 has partial surface scale explosion.
4 enameling firing process and performance evaluation
As can be seen from the above examples, the steel plate (strip) produced by the invention has the mechanical properties of yield strength of 260MPa or more, tensile strength of 360MPa or more and elongation A50The steel plate strength and forming performance requirements of the water heater liner can be met by more than or equal to 30%, and after one-time single-side wet-process enameling, the enameling performance is excellent and the economy is high.
The above detailed description of a hot-rolled pickled enamelled steel in the 260MPa class and the method for producing it, with reference to the examples, is illustrative and not restrictive, and several examples are cited within the limits of the invention, so that variations and modifications without departing from the general concept of the invention are intended to be included within the scope of protection of the invention.
Claims (7)
1. A production method of 260 MPa-level hot-rolled pickled enamel steel is characterized by comprising the following steps: molten iron pretreatment, converter smelting, alloy fine adjustment, RH furnace refining, continuous casting and rolling, coiling and acid washing; in the continuous casting and rolling process, the thickness of a billet before rolling is controlled to be 65mm-90 mm;
the continuous casting and rolling process is a CSP process;
in the acid washing step, the concentration of free acid in acid washing liquid is 90-150 g/L; the temperature of the acid liquor is 70-90 ℃;
the 260 MPa-grade hot-rolled acid-washed enameled steel comprises the following chemical components in percentage by weight: c: 0.030-0.060%, Si is not more than 0.030%, Mn: 0.30-0.60%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, Als: less than or equal to 0.060 percent, B: 0.0015-0.0040%, N: 0.0040-0.0100% and the balance of Fe and inevitable impurity elements;
the metallographic structure of the 260 MPa-grade hot-rolled and acid-washed enamel steel is ferrite, pearlite and bainite;
the yield strength of the 260 MPa-level hot-rolled acid-washed enamel steel is more than or equal to 260MPa, the tensile strength is more than or equal to 360MPa, and the elongation rate A is50More than or equal to 30 percent, and after the steel plate is enameled on a single-side by a one-time wet method, the surface does not generate fish scale explosion.
2. The production method according to claim 1, wherein in the continuous casting and rolling step, the heating temperature of the steel plate before rolling is controlled to be 1100-1300 ℃; the finishing temperature is controlled to be 850-910 ℃.
3. The production method according to claim 1, wherein the continuous casting and rolling step is carried out by laminar cooling.
4. The production method according to claim 1, wherein in the coiling step, the coiling temperature is controlled to be 600-700 ℃.
5. The production method according to any one of claims 1 to 4, wherein the heating temperature of the steel plate before rolling is controlled to be 1132 ℃ to 1212 ℃; the finishing temperature is controlled to be 881-890 ℃; the coiling temperature is controlled to be 687-696 ℃.
6. The production method according to any one of claims 1 to 4, wherein the concentration of free acid in the pickling solution is 105 to 119 g/L; the temperature of the acid liquor is 71.4-74 ℃.
7. The production method according to claim 1, wherein the 260MPa grade hot-rolled and acid-washed enameled steel has a grain size grade of 9.5.
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| CN110747323A (en) * | 2019-10-24 | 2020-02-04 | 马鞍山钢铁股份有限公司 | Acid-washing cold-formed steel and manufacturing method thereof |
| CN111014603B (en) * | 2019-12-30 | 2022-02-25 | 江苏沙钢集团有限公司 | Double-roller casting-rolling production method of boron-added steel |
| CN111455273A (en) * | 2020-04-07 | 2020-07-28 | 新余钢铁股份有限公司 | Base plate for compressor shell and production method thereof |
| CN112501513B (en) * | 2020-11-30 | 2022-05-13 | 日照宝华新材料有限公司 | Low-carbon acid-pickled steel with excellent formability and surface quality and production method thereof |
| CN113042563A (en) * | 2021-03-17 | 2021-06-29 | 包头钢铁（集团）有限责任公司 | Manufacturing method of SPHE hot-rolled pickled plate for stamping |
| CN113198851A (en) * | 2021-03-18 | 2021-08-03 | 日照钢铁控股集团有限公司 | Production method of hot-rolled pickled sheet of enamel steel |
| CN115537664B (en) * | 2022-10-13 | 2023-05-30 | 马鞍山钢铁股份有限公司 | Hot-rolled pickled enamel steel with yield strength more than or equal to 300MPa after enameling and production method thereof |
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| KR100525646B1 (en) * | 2001-09-05 | 2005-11-02 | 주식회사 포스코 | Fabrication method of hot rolled steel plate for enamel |
| EP2145971A1 (en) * | 2008-07-07 | 2010-01-20 | ArcelorMittal France | Hot rolled steel and enamelled steel sheet free of fish scale defect |
| CN102181805B (en) * | 2011-04-07 | 2012-10-31 | 河北钢铁股份有限公司唐山分公司 | Steel plate and method thereof used for producing water heater linear enamel by flexible thin slab rolling line |
| JP5817671B2 (en) * | 2012-08-02 | 2015-11-18 | 新日鐵住金株式会社 | Hot-rolled steel sheet and manufacturing method thereof |
| JP5874581B2 (en) * | 2012-08-28 | 2016-03-02 | 新日鐵住金株式会社 | Hot rolled steel sheet |
| CN103741026A (en) * | 2013-12-26 | 2014-04-23 | 马钢(集团)控股有限公司 | 240MPa-level hot-rolled pickled steel plate for single-sided enameling and production method of 240MPa-level hot-rolled pickled steel plate |
| CN105316579B (en) * | 2014-07-29 | 2017-05-24 | 上海梅山钢铁股份有限公司 | Thin hot rolled pickled steel plate and fabrication method thereof for water heater enamel liner |
| CN108754342A (en) * | 2018-06-25 | 2018-11-06 | 武汉钢铁有限公司 | A kind of inexpensive hyperoxia glassed steel and its manufacturing method of CSP technique productions |
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