CN111826591A - Fatigue-resistant enamel steel for water heater liner and preparation process thereof - Google Patents
Fatigue-resistant enamel steel for water heater liner and preparation process thereof Download PDFInfo
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- CN111826591A CN111826591A CN202010561490.8A CN202010561490A CN111826591A CN 111826591 A CN111826591 A CN 111826591A CN 202010561490 A CN202010561490 A CN 202010561490A CN 111826591 A CN111826591 A CN 111826591A
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses fatigue-resistant enamel steel for a water heater liner, which comprises the following chemical components in percentage by weight: less than or equal to 0.08 percent of C, less than or equal to 0.05 percent of Si, less than or equal to 0.40 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S, more than or equal to 0.020 percent of Alt, less than or equal to 0.01 percent of Nb, and the balance of Fe and inevitable impurity elements. Its preparing process is also disclosed. The invention utilizes a CSP (sheet billet continuous casting and rolling) production line to produce the fatigue-resistant enamel steel for the water heater liner, the manufactured water heater liner can withstand more than 15 ten thousand times of fatigue resistance tests through the pressure tests of a water heater manufacturer, and the pressure times of the liner made of ordinary low-carbon steel are only 6-8 ten thousand times. The enamel steel plate manufactured by the invention has excellent fatigue resistance, fish scaling resistance, enamel performance and formability.
Description
Technical Field
The invention relates to the technical field of metallurgy and steel rolling processes, in particular to fatigue-resistant enamel steel for a water heater liner and a preparation process thereof.
Background
With the increasing demand of consumers for prolonging the service life of electric water heater products, water heater manufacturers update the inner container, and require raw material suppliers to improve the strength of raw materials, but simultaneously ensure the enamel performance and the processing and forming performance of the raw materials. The invention utilizes the CSP continuous casting and rolling production line to produce the anti-fatigue enamel steel product for the water heater liner.
Chinese patent application publication No. CN109207850A discloses a high service strength steel sheet for enamel and a method for manufacturing the same, wherein the steel components involved are C: 0.1% -0.15%, Si: 0.3% -0.5%, Mn: l% -1.8%, V: 0.04 to 0.07 percent, and has higher Si and Mn contents, thereby having higher cost than the invention, and the invention is delivered in a hot rolling state, has poorer thickness tolerance and unevenness of the strip steel, lower elongation and limited use.
The Chinese patent application with the publication number of CN105316579A discloses a thin hot-rolled pickled steel plate for an enamel inner container of a water heater and a manufacturing method thereof, wherein the thin hot-rolled pickled steel plate comprises the following chemical components in percentage by weight: 0.03-0.09%, Si: 0.005-0.035%, Mn: 0.40-0.80%, P is less than or equal to 0.018%, S is less than or equal to 0.014%, N is less than or equal to 0.0050%, A1: 0.002-0.055%, Ti: 0.03-0.06%, Cu: 0.03-0.06%; the thickness of the steel plate is 1.5-2.0 mm. The Mn content is higher than that of the invention, in addition, Ti and Cu alloy are added, the manufacturing cost is higher, the acid-washed state is delivered, the thickness tolerance and the unevenness deviation are the same, the elongation is lower, and the use application is limited.
Chinese patent application publication No. CN108796380A discloses an extremely low carbon steel sheet for cold rolling enamel having a yield strength after firing of 210MPa or more and a method for manufacturing the same, wherein the steel comprises the following components: c: 0.0005-0.008%, Si less than or equal to 0.05%, Mn: 0.2-1.0%, P: 0.08-0.15%, S: 0.008-0.035%, N is less than or equal to 0.005%, A1 is less than or equal to 0.01%, B: 0.0002-0.003%, Cr is less than or equal to 0.10%, Cu: 0.01 to 0.5 percent; o: 0.01-0.04%, Nb: 0.02-0.1%. The invention adopts ultra-low carbon steel to add a plurality of alloy elements, which increases the production difficulty and greatly increases the cost. Meanwhile, the invention has higher O content, more steel inclusions, reduced elongation and poor processability.
The patents disclosed above adopt low-carbon or ultra-low-carbon component design, and more alloy elements (including types and quantities) than the present invention are added to improve the fish scaling resistance and strength of the enamel steel. The method for producing the low-carbon aluminum killed steel by the smelting and CSP continuous casting and rolling process is designed, the fatigue resistance and the enamel performance of the enamel steel are realized by strictly controlling the technological process parameters, only a small amount of Nb element is added, the addition of a large amount of noble metal elements is avoided, and the energy consumption required by smelting and producing the ultra-low carbon steel is reduced. The invention is different from the above invention in component design, and reduces the cost for producing the fatigue-resistant enamel steel. In addition, the hot rolling production line of our factory is a CSP continuous casting and rolling process, compared with the traditional casting machine and rolling machine, the method has the characteristics of low energy consumption and high efficiency, so that the cost advantage of producing the fatigue-resistant enamel steel product is obvious, and the requirement of updating the water heater manufacturer is met.
Disclosure of Invention
The invention relates to a method for producing fatigue-resistant enamel steel for a water heater liner by utilizing a CSP (sheet billet continuous casting and rolling) production line. The inner container of the water heater manufactured by the method can be subjected to a fatigue resistance test more than 15 ten thousand times through a pressure test of a water heater manufacturer, and the pressure times of the inner container made of ordinary low-carbon steel are only 6-8 ten thousand times.
In order to solve the technical problems, the invention adopts the following technical scheme:
the fatigue-resistant enamel steel for the inner container of the water heater comprises the following chemical components in percentage by weight: less than or equal to 0.08 percent of C, less than or equal to 0.05 percent of Si, less than or equal to 0.40 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S, more than or equal to 0.020 percent of Alt, less than or equal to 0.01 percent of Nb, and the balance of Fe and inevitable impurity elements.
Further, the weight percentage of the chemical components is as follows: c is less than or equal to 0.05, Si is less than or equal to 0.02, Mn is less than or equal to 0.20, P is less than or equal to 0.015, S is less than or equal to 0.009, Alt is less than or equal to 0.025 and less than or equal to 0.035, Als is less than or equal to 0.022 and less than or equal to 0.032, Nb is less than or equal to 0.008, Ca is less than or equal to 0.0015 and less than or equal to 0.0027, O is less than or equal to 0.0030 and less than or equal to 0.0060, N is less.
Furthermore, the weight percentage of the chemical components is as follows: c: 0.04, Si: 0.02, Mn: 0.16, P: 0.009, S: 0.002, Alt: 0.028, Als: 0.026, Nb: 0.007, Ca: 0.0011, O: 0.0040, N: 0.0047, and the balance of Fe and inevitable impurity elements.
Furthermore, the weight percentage of the chemical components is as follows: c: 0.03, Si: 0.03, Mn: 0.15, P: 0.010, S: 0.007, Alt: 0.029, Als: 0.027, Nb: 0.006, Ca: 0.0010, O: 0.0045, N: 0.0038 and the balance of Fe and inevitable impurity elements.
Furthermore, the weight percentage of the chemical components is as follows: c: 0.03, Si: 0.02, Mn: 0.17, P: 0.012, S: 0.005, Alt: 0.033, Als: 0.032, Nb: 0.004, Ca: 0.0010, O: 0.0042, N: 0.0050, and the balance Fe and inevitable impurity elements.
Furthermore, the thickness of the finished product ranges from 1.2mm to 2.5 mm.
A preparation process of fatigue-resistant enamel steel for a water heater liner is characterized by comprising the following steps: the preparation process flow is as follows: the method comprises the following steps of molten iron desulfurization, converter, LF refining, continuous casting and rolling, acid pickling, cold rolling, cover annealing and leveling;
wherein:
the initial rolling temperature of the continuous casting and rolling procedure is more than 1080 ℃, the final rolling temperature is more than 880 ℃, and the coiling temperature is more than 570 ℃;
the reduction rate of the cold rolling procedure is 60-70%, the annealing temperature of the bell-type furnace is 660-690 ℃, the annealing time is 8-12 h, and the slow cooling time is 2-3 h;
the flat elongation is 0.8% -1.5%.
Further, the difference between the Alt content and Als content in the LF refining end-point steel is less than 0.003%.
Compared with the prior art, the invention has the beneficial technical effects that:
the content of AL is controlled in a certain range in the smelting process, and the aim is to control the content of oxygen in the molten steel to be kept in a reasonable range, so that the content of oxides in the steel plate is controlled, and micro-cavity traps formed by the oxides can capture H atoms in the enamel process, thereby playing a role in preventing scale explosion. Micro Nb element is added to separate out two-phase particles in the hot rolling and cooling process, micro cavities in the two-phase particles can capture H atoms in the enamel process, and the function of preventing scale explosion is also achieved; on the other hand, Nb plays a role in inhibiting the growth of crystal grains and refining the crystal grains, and improves the strength of the material, namely improves the fatigue resistance. The sulfur content in the steel is controlled to be as small as possible, and the purpose is to control the content of inclusions and avoid the occurrence of hot shortness. The calcium plays a role in promoting inclusions in the steel to become spherical inclusions and float upwards, controlling the content of the inclusions and being beneficial to the formability of the steel plate.
The hot rolling process heats the steel billet to austenitize, adopts higher finish rolling temperature and lower coiling temperature, transforms the austenite structure of the steel into ferrite in the rolling and coiling processes, completes the recrystallization of the ferrite and the grain growth, and precipitates two-phase particles due to the action of Nb in the process to prepare for storing hydrogen in the enamel process.
The total reduction rate of the cold rolling procedure is between 60 and 70 percent, and the higher reduction rate provides enough distortion energy for the subsequent annealing process, is beneficial to the recrystallization and the texture development of the annealing process, and is beneficial to the forming performance of the finished steel plate.
The annealing process adopts a cover annealing mode, the annealing temperature is 660-690 ℃, the annealing time is controlled within 8-12 h, and the slow cooling time is 2-3 h, so that the ferrite structure in the steel is recrystallized, the crystal grains grow up and the texture is fully developed. Meanwhile, Nb in the steel plays a role in inhibiting the growth of crystal grains, and the strength of the steel is improved.
The elongation of the flattening process is set to be between 0.8 and 1.5 percent, and the purpose is to eliminate the yield platform after annealing and prevent the occurrence of yield lines in the processing process.
The fatigue-resistant enamel steel produced by the process and the component control of the invention is verified by a plurality of processes of a plurality of water heater manufacturers, has excellent fatigue resistance, scale explosion resistance, adherence performance and forming performance, and can be used for different processes of dry enamel, wet enamel, single-sided or double-sided enamel and the like.
The fatigue-resistant enamel steel product can be used in the fields of household appliances, architectural decoration and the like, has the advantages that the production difficulty is lower than that of the conventional ultra-low carbon steel, a large amount of alloy or noble metal elements are not added, the production cost is greatly reduced, and the requirement of water heater manufacturers for updating the inner container is met.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a schematic view of the metallographic structure of fatigue-resistant enameled steel according to the present invention.
Detailed Description
The present invention will be further described with reference to specific examples.
Examples 1 to 3: the production method of the low-cost enamel steel is carried out according to the following steps.
(1) The chemical composition of the steel coil in each example is shown in table 1, with the balance being Fe and inevitable impurity elements.
Table 1: chemical composition of the products of examples (Wt%)
(2) According to the component ratio in the table 1, the molten iron is subjected to processes of molten iron desulphurization, converter smelting, LF refining and the like; then performing CSP continuous casting and rolling process, wherein the heating temperature of the plate blank is 1120 ℃, the finish rolling temperature is 880 ℃, the coiling temperature is 570 ℃, and the hot coil thickness is 4.5 mm; the produced hot rolled steel coil is subjected to acid cleaning to remove iron scales and then is subjected to cold rolling, the reduction rate is 60 percent, and the thickness of the cold rolled coil is 1.8 mm; performing cover annealing on the cold-rolled steel coil, wherein the annealing temperature is 690 ℃, the annealing time is 8h, and the slow cooling time is 2 h; finally, the production of the fatigue-resistant enamel steel coil can be finished through the flattening procedure with the elongation rate set to 1.0%.
(3) The mechanical property detection of the enamel steel plate produced by the process shows that the numerical values of the strength and the elongation are shown in table 2. After degreasing treatment, the obtained enameled pressed steel is enameled and sintered, and after sintering, the enameled pressed steel is placed in the air for 48 hours to observe the scale explosion property of the surface of the product, and the fatigue resistance and the adhesion performance are tested. The results are shown in Table 2.
Table 2: performance parameters of the products of the examples
As can be seen from Table 2, the fatigue-resistant enameled steel produced by adopting the component design and process control of the invention has fatigue resistance twice as high as common low-carbon steel, and the elongation of the finished steel plate can meet the processing requirements of bending, flanging, stamping and the like; the scale explosion phenomenon does not occur after the enamel, and the adherence between the steel plate and the enamel is excellent.
The enamel steel plate manufactured by the invention has excellent fatigue resistance, fish scaling resistance, enamel performance and formability. The enamel steel is suitable for single-sided and double-sided enamel processes, such as dry and wet enameling, one-time and multiple enameling and the like, and can be used in the fields of light industry, bathrooms, household appliances and the like. The fatigue resistance and enamel performance of the steel are better than those of cold-rolled common carbon steel.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (8)
1. The utility model provides a water heater inner bag is with resistant fatigue enamel steel which characterized in that: the weight percentage of the chemical components is as follows: less than or equal to 0.08 percent of C, less than or equal to 0.05 percent of Si, less than or equal to 0.40 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S, more than or equal to 0.020 percent of Alt, less than or equal to 0.01 percent of Nb, and the balance of Fe and inevitable impurity elements.
2. The fatigue-resistant enameled steel for the inner container of water heater as claimed in claim 1, wherein: the weight percentage of the chemical components is as follows: c is less than or equal to 0.05, Si is less than or equal to 0.02, Mn is less than or equal to 0.20, P is less than or equal to 0.015, S is less than or equal to 0.009, Alt is less than or equal to 0.025 and less than or equal to 0.035, Als is less than or equal to 0.022 and less than or equal to 0.032, Nb is less than or equal to 0.008, Ca is less than or equal to 0.0015 and less than or equal to 0.0027, O is less than or equal to 0.0030 and less than or equal to 0.0060, N is less.
3. The fatigue-resistant enameled steel for the inner container of water heater as claimed in claim 1, wherein: the weight percentage of the chemical components is as follows: c: 0.04, Si: 0.02, Mn: 0.16, P: 0.009, S: 0.002, Alt: 0.028, Als: 0.026, Nb: 0.007, Ca: 0.0011, O: 0.0040, N: 0.0047, and the balance of Fe and inevitable impurity elements.
4. The fatigue-resistant enameled steel for the inner container of water heater as claimed in claim 1, wherein: the weight percentage of the chemical components is as follows: c: 0.03, Si: 0.03, Mn: 0.15, P: 0.010, S: 0.007, Alt: 0.029, Als: 0.027, Nb: 0.006, Ca: 0.0010, O: 0.0045, N: 0.0038 and the balance of Fe and inevitable impurity elements.
5. The fatigue-resistant enameled steel for the inner container of water heater as claimed in claim 1, wherein: the weight percentage of the chemical components is as follows: c: 0.03, Si: 0.02, Mn: 0.17, P: 0.012, S: 0.005, Alt: 0.033, Als: 0.032, Nb: 0.004, Ca: 0.0010, O: 0.0042, N: 0.0050, and the balance Fe and inevitable impurity elements.
6. The fatigue-resistant enameled steel for the inner container of water heater as claimed in claim 1, wherein: the thickness range of the finished product is 1.2mm-2.5 mm.
7. The preparation process of the fatigue-resistant enameled steel for the inner container of the water heater as claimed in any one of claims 1-6, characterized in that: the preparation process flow is as follows: the method comprises the following steps of molten iron desulfurization, converter, LF refining, continuous casting and rolling, acid pickling, cold rolling, cover annealing and leveling;
wherein:
the initial rolling temperature of the continuous casting and rolling procedure is more than 1080 ℃, the final rolling temperature is more than 880 ℃, and the coiling temperature is more than 570 ℃;
the reduction rate of the cold rolling procedure is 60-70%, the annealing temperature of the bell-type furnace is 660-690 ℃, the annealing time is 8-12 h, and the slow cooling time is 2-3 h;
the flat elongation is 0.8% -1.5%.
8. The process according to claim 7, characterized in that: the difference between the Alt content and Als content in the LF refining end point steel is less than 0.003%.
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| CN202010561490.8A CN111826591A (en) | 2020-06-18 | 2020-06-18 | Fatigue-resistant enamel steel for water heater liner and preparation process thereof |
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| CN202010561490.8A CN111826591A (en) | 2020-06-18 | 2020-06-18 | Fatigue-resistant enamel steel for water heater liner and preparation process thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006037215A (en) * | 2004-07-30 | 2006-02-09 | Nippon Steel Corp | Steel sheet for enameling having good adhesion to enameling, production method therefor, and enameled product |
| CN101139684A (en) * | 2006-09-05 | 2008-03-12 | 宝山钢铁股份有限公司 | Hot-rolled high-strength steel plate for electrostatic enamel and method for manufacturing same |
| JP2010043312A (en) * | 2008-08-11 | 2010-02-25 | Nippon Steel Corp | Steel sheet for porcelain enameling having fishscale resistance |
| CN110373608A (en) * | 2019-07-30 | 2019-10-25 | 包头钢铁（集团）有限责任公司 | A kind of enamelled pressed steel and its production method |
-
2020
- 2020-06-18 CN CN202010561490.8A patent/CN111826591A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006037215A (en) * | 2004-07-30 | 2006-02-09 | Nippon Steel Corp | Steel sheet for enameling having good adhesion to enameling, production method therefor, and enameled product |
| CN101139684A (en) * | 2006-09-05 | 2008-03-12 | 宝山钢铁股份有限公司 | Hot-rolled high-strength steel plate for electrostatic enamel and method for manufacturing same |
| JP2010043312A (en) * | 2008-08-11 | 2010-02-25 | Nippon Steel Corp | Steel sheet for porcelain enameling having fishscale resistance |
| CN110373608A (en) * | 2019-07-30 | 2019-10-25 | 包头钢铁（集团）有限责任公司 | A kind of enamelled pressed steel and its production method |
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Application publication date: 20201027 |