CN114395690A - Production process of 300MPa grade high-strength enamel steel - Google Patents
Production process of 300MPa grade high-strength enamel steel Download PDFInfo
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- CN114395690A CN114395690A CN202111500144.XA CN202111500144A CN114395690A CN 114395690 A CN114395690 A CN 114395690A CN 202111500144 A CN202111500144 A CN 202111500144A CN 114395690 A CN114395690 A CN 114395690A
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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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
-
- 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
- C21D8/0273—Final recrystallisation annealing
-
- 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
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a production process of 300MPa grade high-strength enamel steel, which comprises the following steps: designing and controlling components: adding Ti element (about 0.015-0.035%); slab: stacking and slowly cooling; hot rolling: on the hot rolling process, the finish rolling temperature FT 7: 890 ± 20 ℃, coiling temperature CT: 580 ℃ and 640 ℃; cold rolling and annealing: the large compression ratio and low-temperature annealing process is adopted, the yield strength is 350-390MPa, the tensile strength is 465-500MPa, the elongation is more than 28 percent, and the performance is excellent; simulated enameling firing test: the enamel process is simulated, namely the enamel is cooled at room temperature after the temperature is kept at 850 ℃ for 10 minutes, the change degree of mechanical properties is detected, the yield strength is reduced by 2-23MPa, and the tensile strength is reduced by 45-57 MPa. The quality control of the 300MPa grade enamel steel for the water heater liner is completed through the experimental steps, and the scale explosion resistance performance index of the product is ensured to meet the requirements of users and standards.
Description
Technical Field
The invention relates to the field of processing of enamel steel, in particular to a production process of 300MPa grade high-strength enamel steel.
Background
In recent years, water heaters are rapidly developed and are more favored by consumers, but as market competition is increasingly fierce, manufacturers of inner containers of the water heaters are forced to bear the pressure of production cost, and require light materials, and simultaneously require steel plates and strong pressure resistance, the enamel is not scaled and resistant to impulse fatigue, so that the materials have to have high strength and certain forming performance, and the strength of the materials is required to be reduced less after the enamel firing at a high temperature of 850 ℃.
Therefore, a production process of 300MPa grade high-strength enamel steel is provided to solve the problems.
Disclosure of Invention
Production tests are adopted to deeply research relevant factors which can influence the fish scaling resistance of the enamel steel, wherein the relevant factors comprise 1 influence of chemical components on the service performance; 2. the influence of cold charging of the plate blank on the hot rolling production and quality; 3. the influence of the hot-rolling process (FT7/CT, etc.) on the product performance and the subsequent product quality; 4. optimization of cold rolling reduction rate and influence of a continuous annealing process on the service performance; 5. influence of the enamel process of the user on the properties of the finished product.
The technical purpose of the invention is realized by the following technical scheme:
a production process of 300MPa grade high strength enamel steel comprises the following steps:
step one, designing and controlling components: ti element (about 0.015-0.035%) is added into C-Mn steel, and the quantity of TiC and TiN in the steel is increased to improve the hydrogen storage performance of the steel plate;
step two, slab: stacking slow cooling is adopted, and the supersaturated and desolventized hydrogen is diffused out quickly when the plate blank is subjected to a higher temperature for a longer time;
step three, hot rolling: in the hot rolling process, a control concept of high-temperature final rolling and low-temperature coiling is adopted, wherein the final rolling temperature FT 7: 890 ± 20 ℃, coiling temperature CT: 580 ℃ and 640 ℃;
step four, cold rolling and annealing: the large compression ratio and low-temperature annealing process is adopted, the yield strength is 350-390MPa, the tensile strength is 465-500MPa, the elongation is more than 28 percent, and the performance is excellent;
step five, simulating a enameling burning test: the enamel process is simulated, namely after the temperature is kept at 850 ℃ for 10 minutes, the enamel is cooled at room temperature to detect the change degree of mechanical properties, the yield strength is reduced by 2-23MPa, and the tensile strength is reduced by 45-57 MPa.
Further, after the steps are completed, the fish scaling resistance performance detection is required to be carried out: the scale explosion index TH value and the inspection analysis are carried out on the 300MPa grade high-strength enamel steel for testing the water heater liner, and the enamel scale explosion resistance sensitivity TH is generally considered to be more than or equal to 6.7min/mm2The scale explosion resistance of the tested plate is qualified, and the TH of a 300 MPa-grade sample is detected to be more than or equal to 8.5min/mm2All passed the hydrogen permeation test.
Further, the 300MPa grade high-strength enamel steel for the inner container of the water heater in the step one comprises titanium, and the content of the titanium is controlled within the range of 0.015-0.035%.
Further, the 300MPa grade high-strength enamel steel for the water heater liner in the step one comprises manganese, and in order to ensure the enameling adherence of the steel plate, the manganese content is controlled within the range of 0.60-0.90%.
Further, the 300MPa grade high-strength enamel steel for the water heater liner in the step one comprises nitrogen, and for the 300MPa grade high-strength enamel steel, large-size precipitates are TiN particles; with the increase of the N content, the number of TiN particles in the steel is increased, the size of the TiN particles is increased, the hydrogen permeation time is prolonged, and the scale explosion resistance of the steel plate is improved. Therefore, the nitrogen content is controlled between 0.0040 and 0.0075 percent.
Further, the 300MPa grade high strength enamel steel for the water heater liner in the step one comprises carbon, the carbon content is controlled to be in a range of 0.04-0.08%, for the enamel steel, the higher the carbon content is, the baking deformation of the enamel product is increased, and carbon atoms in the steel plate are easy to react with oxygen in the enamel to generate carbon monoxide, so that bubbles are generated on the surface of the enamel product.
Further, the fourth step of cold rolling and annealing is carried out, the increase of the cold rolling reduction rate is very beneficial to the breaking of cementite and the increase of the number of lattice distortion areas, the grains after recrystallization and annealing become thin along with the increase of the cold rolling reduction rate, the grain boundary for preventing hydrogen diffusion is increased along with the thinning, and the scale explosion resistance is facilitated, but according to the rolling capacity of a cold rolling mill, the cold rolling reduction rate of the 300MPa grade high-strength enamel steel for the liner of the water heater is set to be 55-75%.
Further, the fourth step of cold rolling and annealing is to adopt an annealing process which is more favorable for aggregation and growth of second phase particles in the annealing process, and the annealing temperature is controlled at 790-810 ℃.
In conclusion, the invention has the following beneficial effects:
through the process research of the scale explosion resistance of the enamel steel, technologists master key process technologies in various production links of 300MPa grade high-strength enamel steel for the inner liner of the water heater, and ensure that the scale explosion resistance index of a product meets the requirements of users and standards and meets the use requirements of the users.
Drawings
FIG. 1 is a metallographic structure diagram of a production process of 300MPa grade high strength enamel steel.
Detailed Description
The present invention will now be described more fully hereinafter in the context of four embodiments, it being understood that the embodiments described are only some, but not all, of the embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A production process of 300MPa grade high strength enamel steel comprises the following steps:
step one, designing and controlling components: ti element (about 0.015-0.035%) is added in C-Mn steel, the quantity of TiC and TiN in the steel is increased to raise hydrogen storage property of steel plate,
the 300MPa grade high-strength enamel steel for the water heater liner comprises titanium, the content of the titanium is controlled within the range of 0.015-0.035%, the 300MPa grade high-strength enamel steel for the water heater liner comprises carbon, the content of the carbon is controlled within the range of 0.04-0.08%, for the enamel steel, the higher the content of the carbon is, the baking deformation of enamel products is increased, and carbon atoms in a steel plate are easy to react with oxygen in enamel to generate carbon monoxide, so that bubbles are generated on the surface of the enamel products,
the 300MPa grade high-strength enamel steel for the water heater liner comprises manganese, and in order to ensure the enameling adherence of the steel plate, the manganese content is controlled within the range of 0.60-0.90%. The 300MPa grade high-strength enamel steel for the water heater liner comprises nitrogen, and for the 300MPa grade high-strength enamel steel, large-size educts are TiN particles; with the increase of the N content, the number of TiN particles in the steel is increased, the size of the TiN particles is increased, the hydrogen permeation time is prolonged, and the scale explosion resistance of the steel plate is improved. Therefore, the nitrogen content is controlled between 0.0040 and 0.0075 percent;
step two, slab: stacking slow cooling is adopted, the supersaturated and desolventized hydrogen is quickly diffused out when the plate blank is subjected to a higher temperature for a longer time, the whole process is adopted for protective pouring, and the plate blank stacking is slowly cooled to the room temperature;
step three, hot rolling: in the hot rolling process, a control concept of high-temperature final rolling and low-temperature coiling is adopted, wherein the final rolling temperature FT 7: 890 ± 20 ℃, coiling temperature CT: 580 minus or plus 640 ℃, the heating temperature of the casting blank is 1240 +/-30 ℃, the heat preservation time of the casting blank in the furnace is more than 130min, a seven-stand hot continuous rolling mill is adopted, the final rolling temperature is controlled to be 890 +/-20 ℃, and the coiling temperature is 580 minus or plus 640 ℃;
step four, cold rolling and annealing: the large compression ratio and low temperature annealing process is adopted, the yield strength is 350-390MPa, the tensile strength is 465-500MPa, the elongation is above 28 percent, the performance is excellent, the increase of the cold rolling reduction rate is very favorable for breaking cementite and increasing the number of lattice distortion zones, the grains after recrystallization annealing are thinned along with the increase of the cold rolling reduction rate, the increase of the crystal boundary for preventing hydrogen diffusion is facilitated, the anti-scaling explosion is facilitated, but the relative reduction rate of cold rolling is 55-75% according to the rolling capacity of a cold rolling mill, so that the cold rolling reduction rate of the 300MPa grade high-strength enamel steel for the liner of the water heater is set to be 55-75%, in the annealing process, an annealing process which is more beneficial to the aggregation and growth of second phase particles is adopted, the annealing temperature is controlled to be 790-;
step five, simulating a enameling burning test: simulating the enamel process, namely, after the temperature is kept at 850 ℃ for 10 minutes, cooling at room temperature to detect the change degree of mechanical properties, reducing the yield strength by 2-23MPa and the tensile strength by 45-57MPa, and cooling at room temperature in a muffle furnace, namely, after the temperature is kept at 850 ℃ for 10 minutes, and enameling the fired tissue shown in figure 1.
After the steps are completed, the fish scaling resistance performance detection is required: the scale explosion index TH value and the inspection analysis are carried out on the 300MPa grade high-strength enamel steel for testing the water heater liner, and the enamel scale explosion resistance sensitivity TH is generally considered to be more than or equal to 6.7min/mm2The scale explosion resistance of the tested plate is qualified, and the TH of a 300 MPa-grade sample is detected to be more than or equal to 8.5min/mm2All passed the hydrogen permeation test.
Table 1 chemical composition of examples of the invention
| Examples | C | Si | Mn | P | S | Ti | N |
| Example 1 | 0.06 | 0.05 | 0.69 | 0.010 | 0.012 | 0.025 | 0.053 |
| Example 2 | 0.05 | 0.05 | 0.69 | 0.010 | 0.015 | 0.028 | 0.043 |
| Example 3 | 0.06 | 0.04 | 0.66 | 0.009 | 0.011 | 0.024 | 0.060 |
| Example 4 | 0.05 | 0.05 | 0.70 | 0.011 | 0.014 | 0.021 | 0.068 |
Table 2 slab slow cooling process of the embodiment of the present invention
| Examples | Stacking method | Time of slow cooling | Measured temperature/. degree.C |
| Example 1 | Stacking, uppermost layer | 72h36min | 153 |
| Example 2 | Stacking, intermediate layers | 73h06min | 165 |
| Example 3 | Stacking, intermediate layers | 73h15min | 163 |
| Example 4 | Stacking, lowermost layer | 73h46min | 173 |
TABLE 3 Rolling Process parameters for the practice of the invention
TABLE 4 mechanical Properties of Cold Rolling performed according to the invention
| Examples | Yield strength/MPa | Tensile strength/MPa | Elongation/percent |
| Example 1 | 377 | 489 | 32.8 |
| Example 2 | 367 | 481 | 29.5 |
| Example 3 | 386 | 494 | 27.5 |
| Example 4 | 385 | 493 | 27.4 |
TABLE 5 simulation of properties after enameling in accordance with the examples of the invention
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A production process of 300MPa grade high strength enamel steel is characterized in that: the method comprises the following steps:
step one, designing and controlling components: ti element (about 0.015-0.035%) is added into C-Mn steel, and the quantity of TiC and TiN in the steel is increased to improve the hydrogen storage performance of the steel plate;
step two, slab: stacking slow cooling is adopted, and the supersaturated and desolventized hydrogen is diffused out quickly when the plate blank is subjected to a higher temperature for a longer time;
step three, hot rolling: in the hot rolling process, a control concept of high-temperature final rolling and low-temperature coiling is adopted, wherein the final rolling temperature FT 7: 890 ± 20 ℃, coiling temperature CT: 580 ℃ and 640 ℃;
step four, cold rolling and annealing: the large compression ratio and low-temperature annealing process is adopted, the yield strength is 350-390MPa, the tensile strength is 465-500MPa, the elongation is more than 28 percent, and the performance is excellent;
step five, simulating a enameling burning test: the enamel process is simulated, namely after the temperature is kept at 850 ℃ for 10 minutes, the enamel is cooled at room temperature to detect the change degree of mechanical properties, the yield strength is reduced by 2-23MPa, and the tensile strength is reduced by 45-57 MPa.
2. The production process of the 300MPa grade high strength enamel steel according to the claim 1, characterized in that: after the steps are completed, the fish scaling resistance performance detection is required: the scale explosion index TH value of the test enamel steel is tested and analyzed, and the enamel scale explosion resistance sensitivity TH is generally considered to be more than or equal to 6.7min/mm2The scale explosion resistance is qualified, and the detection shows that 300MPa grade high-strength enamel samples are all 8.5min/mm2All the above were qualified.
3. The production process of the 300MPa grade high strength enamel steel according to the claim 2, characterized in that: the 300MPa grade high-strength enamel steel for the water heater liner in the first step comprises titanium, the content of the titanium is controlled within the range of 0.015% -0.035%, the titanium is a carbide forming element, precipitated phases are TiN, TiC, TiS, Ti4C2S2 and the like, the hydrogen penetration time is influenced by the amount of the precipitated phases, and the more the precipitated phases are, the longer the hydrogen penetration time is.
4. The production process of the 300MPa grade high strength enamel steel according to the claim 2, characterized in that: the 300MPa grade high-strength enamel steel for the water heater liner in the step one comprises manganese, and the manganese content is controlled within the range of 0.60-0.90% in order to ensure the enamel coating adherence of the steel plate.
5. The production process of the 300MPa grade high strength enamel steel according to the claim 2, characterized in that: the 300MPa grade high-strength enamel steel for the water heater liner in the step one comprises nitrogen, and for the 300MPa grade high-strength enamel steel, large-size precipitates are TiN particles; with the increase of the N content, the number of TiN particles in the steel is increased, the size of the TiN particles is increased, the hydrogen permeation time is prolonged, and the scale explosion resistance of the steel plate is improved. Therefore, the nitrogen content is controlled between 0.0040 and 0.0075 percent.
6. The production process of the 300MPa grade high strength enamel steel according to the claim 2, characterized in that: the 300 MPa-grade high-strength enamel steel for the water heater liner in the first step comprises carbon, the carbon content is controlled to be within the range of 0.04-0.08%, for the enamel steel, the higher the carbon content is, the baking deformation of an enamel product is increased, and carbon atoms in a steel plate are easy to react with oxygen in enamel to generate carbon monoxide, so that bubbles are generated on the surface of the enamel product.
7. The production process of the 300MPa grade high strength enamel steel according to the claim 4, characterized in that: and fourthly, cold rolling and annealing, wherein the increase of the cold rolling reduction rate is very beneficial to the fracture of cementite and the increase of the number of lattice distortion areas, the grains after recrystallization and annealing become thin along with the increase of the cold rolling reduction rate, the increase of the crystal boundary for preventing hydrogen diffusion is facilitated, and the scale explosion resistance is facilitated, but according to the rolling capacity of a cold rolling mill, the cold rolling reduction rate of the 300MPa grade high-strength enamel steel for the inner container of the water heater is set to be 55-75%.
8. The production process of the 300MPa grade high strength enamel steel according to claim 7, characterized in that: and step four, cold rolling and annealing, wherein in the annealing process, an annealing process which is more favorable for aggregation and growth of second phase particles is adopted, and the annealing temperature is controlled at 780-810 ℃.
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| CN101063189A (en) * | 2006-04-29 | 2007-10-31 | 宝山钢铁股份有限公司 | Hot-rolled fine-grained steel for electrostatic enamel and manufacturing method thereof |
| CN101684532A (en) * | 2008-09-27 | 2010-03-31 | 鞍钢股份有限公司 | Enamel steel for cold-rolled water heater and production method |
| CN103540845A (en) * | 2013-11-07 | 2014-01-29 | 武汉钢铁(集团)公司 | Hot-rolled thin plate enamelled steel with yield strength of 330 MPa and manufacturing method thereof |
| KR20150112507A (en) * | 2014-03-28 | 2015-10-07 | 현대제철 주식회사 | Cold-rolled steel sheet for enamel and method of manufacturing the same |
| CN106834920A (en) * | 2016-12-23 | 2017-06-13 | 东北大学 | A kind of hot rolling enamelled pressed steel and preparation method thereof |
| CN110343964A (en) * | 2019-07-30 | 2019-10-18 | 马鞍山钢铁股份有限公司 | A kind of yield strength is greater than the enamel cold-rolled steel sheet and its production method of 500MPa |
| CN111945060A (en) * | 2020-07-08 | 2020-11-17 | 柳州钢铁股份有限公司 | Method for manufacturing cold-rolled high-strength heat-resistant enamel steel |
| CN113684413A (en) * | 2020-05-18 | 2021-11-23 | 宝山钢铁股份有限公司 | Cold-rolled enamel steel for deep drawing liner and manufacturing method thereof |
-
2021
- 2021-12-09 CN CN202111500144.XA patent/CN114395690A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101063189A (en) * | 2006-04-29 | 2007-10-31 | 宝山钢铁股份有限公司 | Hot-rolled fine-grained steel for electrostatic enamel and manufacturing method thereof |
| CN101684532A (en) * | 2008-09-27 | 2010-03-31 | 鞍钢股份有限公司 | Enamel steel for cold-rolled water heater and production method |
| CN103540845A (en) * | 2013-11-07 | 2014-01-29 | 武汉钢铁(集团)公司 | Hot-rolled thin plate enamelled steel with yield strength of 330 MPa and manufacturing method thereof |
| KR20150112507A (en) * | 2014-03-28 | 2015-10-07 | 현대제철 주식회사 | Cold-rolled steel sheet for enamel and method of manufacturing the same |
| CN106834920A (en) * | 2016-12-23 | 2017-06-13 | 东北大学 | A kind of hot rolling enamelled pressed steel and preparation method thereof |
| CN110343964A (en) * | 2019-07-30 | 2019-10-18 | 马鞍山钢铁股份有限公司 | A kind of yield strength is greater than the enamel cold-rolled steel sheet and its production method of 500MPa |
| CN113684413A (en) * | 2020-05-18 | 2021-11-23 | 宝山钢铁股份有限公司 | Cold-rolled enamel steel for deep drawing liner and manufacturing method thereof |
| CN111945060A (en) * | 2020-07-08 | 2020-11-17 | 柳州钢铁股份有限公司 | Method for manufacturing cold-rolled high-strength heat-resistant enamel steel |
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