CN111748678B - Low-compression-ratio large-thickness lamellar tearing-resistant steel plate and manufacturing method thereof - Google Patents
Low-compression-ratio large-thickness lamellar tearing-resistant steel plate and manufacturing method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- 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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- 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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- 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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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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Abstract
The invention discloses a low-compression-ratio large-thickness lamellar tearing-resistant steel plate and a manufacturing method thereof. The manufacturing method of the steel plate comprises the following steps: selecting steel raw materials for smelting and casting to form a continuous casting billet, wherein the steel raw materials comprise the following chemical components in percentage by mass: c: 0.13 to 0.20%, Si: 0.25 to 0.4%, Mn: 1.5-1.6%, P: less than or equal to 0.015%, S: less than or equal to 0.002%, Alt: 0.15 to 0.4%, Nb: 0.025 to 0.04%, Ti: 0.006-0.012%, and the balance of Fe and inevitable impurity elements; and heating and preserving heat of the continuous casting billet, then carrying out rough rolling and finish rolling on the continuous casting billet in sequence, and carrying out heat treatment on the continuous casting billet after slow cooling to obtain the low-compression-ratio large-thickness lamellar tearing resistant steel plate. According to the manufacturing method of the steel plate, the large-thickness steel plate with excellent comprehensive performance can be produced under a low compression ratio only by a simple heat treatment process after rolling and slow cooling, the steel plate is uniform and fine in structure, excellent in lamellar tearing resistance, and free of forced use of a high-temperature large-pressure means and high-temperature normalizing treatment, and the manufacturability and the production efficiency of a steel mill are improved.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a low-compression-ratio large-thickness lamellar tearing resistant steel plate and a manufacturing method thereof.
Background
With the continuous development of the manufacturing process of large-scale equipment, the requirements of the steel plate with a large-thickness structure are more and more, and the mechanical property, the lamellar tearing resistance and the like of the steel plate are higher. As is known, the manufacturing capability of steel plate with thick specification in a steel mill is determined by the thickness of a plate blank, and the thickness of the plate blank in the steel mill is fixed, and the limitation of the thickness of the plate blank is often the bottleneck of the whole order of an enterprise.
In the case of a large-thickness steel sheet, the thickness of the finished steel sheet is increased, so that the overall compression ratio is reduced, the crystal grains are coarse, and the performance is difficult to guarantee. At present, the method for improving the lamellar tearing resistance of the steel plate mainly comprises the steps of rolling at high temperature and under high pressure and carrying out off-line normalizing treatment. Chinese patent CN 109576466A provides a low compression ratio super-thick low-temperature structural steel plate and a manufacturing method thereof, the compression ratio from a blank to a finished product in the production process is less than or equal to 3, the steel plate has good lamellar tearing resistance, but the rolling process adopts a one-stage rolling process of high temperature and high pressure, the steel plate is normalized after rolling, and accelerated cooling is adopted after the normalization. Chinese patent CN 105755375A discloses a low compression ratio super-thick low-temperature structural steel plate and a manufacturing method thereof, the steel plate has good low-temperature impact toughness, higher strength and excellent lamellar tearing resistance under the condition that the compression ratio is less than 2.0, but the steel plate is rolled twice by adopting a high-temperature high-pressure technology, the steel plate needs to be normalized after rolling, and the heat preservation time coefficient is as follows: 2.2-2.5 min/mm.
The high-temperature high-pressure rolling process has high requirements on a rolling mill, the normalizing heat treatment is carried out after rolling, the normalizing treatment time is long, a steel plate needs to be heated to the normalizing temperature and then is kept for a period of time, the furnace time/steel plate thickness coefficient is usually 2.0-3.5 min/mm, and the method is not a reproducible economic manufacturing method.
Therefore, it is required to develop a low compression ratio large thickness lamellar tear resistant steel sheet without using a high temperature and high pressure process and a high temperature normalizing treatment.
Disclosure of Invention
The invention provides a low-compression-ratio large-thickness lamellar tearing-resistant steel plate for overcoming the defects of overhigh requirement condition and long rolling time of the rolling process in the prior art.
Another object of the present invention is to provide a method for manufacturing the above-mentioned low compression ratio large thickness lamellar tear resistant steel sheet.
In order to solve the technical problems, the invention adopts the technical scheme that:
a manufacturing method of a low-compression-ratio large-thickness lamellar tearing-resistant steel plate comprises the following steps:
selecting steel raw materials to smelt and cast to form a continuous casting billet,
the steel comprises the following chemical components in percentage by mass: c: 0.13 to 0.20%, Si: 0.25 to 0.4%, Mn: 1.5-1.6%, P: less than or equal to 0.015%, S: less than or equal to 0.002%, Alt: 0.15 to 0.4%, Nb: 0.025 to 0.04%, Ti: 0.006-0.012%, and the balance of Fe and inevitable impurity elements;
heating and preserving heat of the continuous casting billet, and then sequentially carrying out rough rolling and finish rolling on the continuous casting billet, wherein the rough rolling is directly rolling the continuous casting billet after heat preservation and discharging from a furnace; reducing the central temperature of the rough-rolled continuous casting slab to 830-880 ℃, and then performing finish rolling to obtain a semi-finished steel plate;
and (3) slowly cooling the semi-finished steel plate, and then carrying out heat treatment on the semi-finished steel plate, wherein the furnace gas temperature of the heat treatment is 860-900 ℃, and the furnace time/steel plate thickness coefficient of the steel plate is 0.8-1.2 min/mm, so that the low-compression-ratio large-thickness lamellar tearing-resistant steel plate is obtained.
The C content has great influence on the strength, low-temperature toughness and weldability of the steel, and is not suitable to be too low or too high from the aspects of the strength of the steel and the control of a microstructure in the production and manufacturing processes. When the C content in the steel is too low, a TMCP production process is adopted, namely, water cooling is carried out after rolling to refine crystal grains, but the refining is reversible, and the strength of the steel plate is sharply reduced if the post-processing process has heat treatment at the temperature of more than 600 ℃; when the content of C is too high, the number of pearlite in the steel plate structure is increased, and the number of ferrite is reduced, so that the hardness and the strength of the rolled steel are high, the rolled steel needs to be treated by heat treatment modes such as tempering, low-temperature tempering after quenching, low-temperature tempering after high-frequency quenching, isothermal quenching, medium-temperature tempering after quenching and the like, and the lamellar tearing resistance is poor after the heat treatment.
The conventional steel normalizing treatment is to heat the steel member to Ac3(actual phase transition temperature during carbon steel heating) is 30-50 ℃, and then the temperature is kept for a long time, and crystal grains of the steel are refined at a high cooling speed. In the application, the steel plate can obtain better lamellar tearing resistance in a relatively shorter time through the selection of the chemical components of the steel plate, the control of the finish rolling temperature, the slow cooling of the steel plate and the mutual matching of the manufacturing conditions of the furnace gas temperature and the heat treatment time in the heat treatment step.
Preferably, the chemical composition of the steel raw material may further include Cu: 0.2 to 0.3 wt%, Ni: 0.2 to 0.3 wt%.
The impact toughness of the steel plate at-40 ℃ can be improved by adding Cu and Ni into the components of the steel plate.
Preferably, the chemical composition of the steel raw material may further include Ca: 0.0015 to 0.004 wt%, and the Ca/S mass ratio is 1.0 to 4.5.
The addition of Ca can promote inclusions in the steel to be uniformly and finely dispersed in the steel, and further improve the low-temperature toughness of the steel plate.
Preferably, the total reduction rate of the finish rolling is more than or equal to 40 percent.
In the finish rolling stage, the total reduction rate is controlled to be a higher level, so that the deformed billet can be ensured to be recrystallized, austenite grains are refined, the rolling deformation is ensured to penetrate through the core part of the steel plate, and the microstructure and the performance of the central part of the steel plate are improved.
Preferably, the compression ratio from the continuous casting billet to the finished product of the high-thickness lamellar tearing resisting steel plate with low compression ratio in the manufacturing method is less than or equal to 3.
Preferably, the thickness of the continuous casting slab is 200-230 mm.
Preferably, the thickness of the low-compression-ratio large-thickness lamellar tearing-resistant steel plate is 60-90 mm.
Preferably, the heating temperature is 1080-1250 ℃.
More preferably, the heating is continuously performed until the center temperature of the continuous casting billet is more than or equal to 1150 ℃.
Preferably, the heat preservation time is more than or equal to 30 min.
Preferably, the slow cooling time is more than or equal to 24 hours.
The invention also discloses a low-compression-ratio large-thickness lamellar tearing resistant steel plate which is prepared by the preparation method.
Generally, the steel plate with the thickness more than or equal to 60mm is a large-thickness steel plate, and the compression ratio is less than or equal to 3.0, namely a low compression ratio.
The thickness of the low-compression-ratio large-thickness lamellar tearing-resistant steel plate is 60-90 mm.
The average reduction of area of the low-compression-ratio large-thickness lamellar tearing-resistant steel plate is more than or equal to 35 percent.
Compared with the prior art, the invention has the beneficial effects that:
the invention creatively develops the low-compression-ratio large-thickness lamellar tearing-resistant steel plate which is uniform and fine in structure and excellent in lamellar tearing resistance, and meanwhile, the manufacturing method of the steel plate only needs a simple heat treatment process, can produce the large-thickness steel plate at the low compression ratio, does not need a mandatory 'high-temperature and high-pressure' means and high-temperature normalizing treatment, and improves the manufacturability and the production efficiency of a steel mill.
Drawings
Fig. 1 is a microstructure photograph of 100 times of a low compression ratio large thickness lamellar tear resistant steel plate manufactured in example 1.
Detailed Description
The present invention will be further described with reference to the following embodiments.
The raw materials in the examples are all commercially available;
reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
Examples 1 to 3
Examples 1 to 3 provide a low compression ratio, large thickness, lamellar tear resistant steel sheet having the chemical composition in mass percent as shown in table 1.
TABLE 1 examples 1 to 3 chemical composition mass percents of steel sheets
| Steel sample | C(％) | Si(％) | Mn(％) | P(％) | S(％) | Alt(％) | Nb(％) | Ti(％) | Cu(％) | Ni(％) | Ca(％) |
| Example 1 | 0.1529 | 0.2616 | 1.51 | 0.0091 | 0.0009 | 0.0409 | 0.0334 | 0.0106 | 0.267 | 0.258 | 0.0023 |
| Example 2 | 0.1462 | 0.2588 | 1.507 | 0.0088 | 0.0008 | 0.0363 | 0.0307 | 0.014 | 0.279 | 0.266 | 0.0035 |
| Example 3 | 0.1467 | 0.2542 | 1.482 | 0.0101 | 0.0007 | 0.0403 | 0.0331 | 0.014 | 0.279 | 0.266 | 0.0021 |
| Comparative example 1 | 0.1529 | 0.2616 | 1.51 | 0.0091 | 0.0009 | 0.0409 | 0.0334 | 0.0106 | 0.267 | 0.258 | 0.0023 |
| Comparative example 2 | 0.1462 | 0.2588 | 1.507 | 0.0088 | 0.0008 | 0.0363 | 0.0307 | 0.014 | 0.279 | 0.266 | 0.0035 |
| Comparative example 3 | 0.1467 | 0.2542 | 1.482 | 0.0101 | 0.0007 | 0.0403 | 0.0331 | 0.014 | 0.279 | 0.266 | 0.0021 |
The manufacturing method of the low-compression-ratio large-thickness lamellar tearing-resistant steel plate provided by the embodiment 1-3 comprises the following steps:
selecting raw materials according to the chemical components of the steel plate in percentage by mass in table 1, smelting and casting to form a continuous casting billet, wherein the thickness of the continuous casting billet is 227mm,
heating the continuous casting slab to the center average temperature t1, preserving heat, and sequentially carrying out rough rolling and finish rolling on the continuous casting slab, wherein the rough rolling is directly rolling the continuous casting slab after being discharged from a furnace after heat preservation; reducing the central temperature of the roughly rolled continuous casting slab to t2, and then performing finish rolling, wherein the total reduction rate of the finish rolling is Z, so as to obtain a semi-finished steel plate, and the central temperature of the semi-finished steel plate is t 3;
slowly cooling the semi-finished steel plate for 24 hours, and then carrying out heat treatment on the semi-finished steel plate, wherein the furnace gas temperature of the heat treatment is t4, the furnace time of the steel plate is X, the tapping temperature of the steel plate is t5, so that the low-compression ratio large-thickness lamellar tearing resistant steel plate is obtained, and the thickness of the finished product is Y;
the specific parameters of each index are shown in Table 2.
TABLE 2 Process parameters for preparation of examples 1 to 3
Comparative examples 1 to 3
Comparative examples 1 to 3 provide a low compression ratio large thickness steel sheet whose chemical composition mass percentages are shown in table 1.
Compared with the manufacturing methods of the steel plates in the embodiments 1 to 3, the manufacturing method of the steel plate with low compression ratio and large thickness provided in the comparative examples 1 to 3 has the following differences:
and (3) slowly cooling the semi-finished steel plate for 24 hours, and then carrying out no heat treatment or any subsequent treatment on the semi-finished steel plate to obtain the steel plate with low compression ratio and large thickness.
Performance testing
The steel sheet manufactured in example 1 was examined metallographically by a factor of 100, and a typical microstructure photograph is shown in fig. 1.
The steel sheets manufactured in examples 1 to 3 and comparative examples 1 to 3 were subjected to a performance test.
Tensile strength Rm, upper yield strength ReH, specified non-proportional elongation rp0.2, elongation a: GB/T228.1-2010-Metal materials tensile test;
impact resistance Akv at-40 ℃: GB/T229-2007 method for testing Charpy pendulum impact of metal materials;
lamellar tear resistance (reduction of area): GB/T228.1-2010-Metal Material tensile test.
The results of the tests on the lamellar tearing resistance of the steel sheets of examples 1 to 3 and comparative examples 1 to 3 are shown in Table 3.
TABLE 3 test results of lamellar tear resistance of steel sheets of examples 1 to 3 and comparative examples 1 to 3
The chemical compositions of the steel sheets of comparative examples 1, 2, 3 were the same as those of the steel sheets of examples 1, 2, 3, respectively, comparative examples 1 to 3 did not heat-treat the steel sheets or any subsequent treatment after rolling and slow cooling, while examples 1 to 3 heat-treat the steel sheets after rolling and slow cooling.
As can be seen from Table 3, when comparing the reduction of area of each comparative example with that of the examples, the average values of the reduction of area of examples 1 to 3 were 35 or more and the minimum values were 25 or more, i.e., the steel sheets provided in examples 1 to 3 all satisfied the thickness direction performance Z35.
The reduction of area of any of the steel plates in comparative examples 1-3 did not reach 35%, indicating that the anti-lamellar-tearing performance of the steel plates was greatly improved compared to the non-heat-treated steel plates by heat treatment after slow cooling under the same steel plate chemical composition and smelting, casting, heating and holding, rolling and slow cooling conditions.
The results of the mechanical property tests of the steel sheets of examples 1 to 3 are shown in Table 4.
TABLE 4 test results of mechanical properties of steel sheets of examples 1 to 3
As can be seen from Table 4, the steel plates provided in examples 1 to 3 have good comprehensive properties, the tensile strength is more than or equal to 500MPa, the upper yield strength is more than or equal to 370MPa, the elongation A is more than or equal to 28%, and the Kv2 impact energy at-40 ℃ is more than or equal to 160J. The steel sheets manufactured in examples 1 to 3 showed excellent levels in both mechanical properties and low-temperature toughness.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A method for manufacturing a low-compression-ratio large-thickness lamellar tearing-resistant steel plate is characterized by comprising the following steps of:
s1, selecting steel raw materials to carry out smelting and casting to form a continuous casting billet,
the steel comprises the following chemical components in percentage by mass: c: 0.13 to 0.20%, Si: 0.25 to 0.4%, Mn: 1.5-1.6%, P: less than or equal to 0.015%, S: less than or equal to 0.002%, Alt: 0.15 to 0.4%, Nb: 0.025 to 0.04%, Ti: 0.006-0.012%, Cu: 0.2 to 0.3%, Ni: 0.2 to 0.3%, Ca: 0.0015-0.004%, and the mass ratio of Ca to S is 1.0-4.5; the balance of Fe and inevitable impurity elements;
s2, heating and preserving heat of the continuous casting billet, and then sequentially carrying out rough rolling and finish rolling on the continuous casting billet, wherein the rough rolling is directly rolling the continuous casting billet after heat preservation and discharging from a furnace; reducing the central temperature of the rough-rolled continuous casting slab to 830-880 ℃, and then performing finish rolling to obtain a semi-finished steel plate;
and S3, slowly cooling the semi-finished steel plate, and then carrying out heat treatment on the semi-finished steel plate, wherein the furnace gas temperature of the heat treatment is 860-900 ℃, and the in-furnace time/thickness coefficient of the steel plate is 0.8-1.2 min/mm, so that the low-compression-ratio large-thickness lamellar tearing-resistant steel plate is obtained.
2. The manufacturing method according to claim 1, wherein the total reduction rate of the finish rolling is not less than 40%.
3. The manufacturing method according to claim 1, wherein the thickness of the continuous cast slab is 200 to 230 mm.
4. The manufacturing method according to claim 1, wherein the heating temperature is 1080 to 1250 ℃; the heat preservation time is more than or equal to 30 min.
5. The method of claim 1, wherein the slow cooling time is not less than 24 hours.
6. A low-compression-ratio large-thickness lamellar tearing-resistant steel plate which is prepared by the manufacturing method of any one of claims 1 to 5.
7. The steel plate according to claim 6, wherein the average reduction of area of the steel plate is not less than 35%.
8. The steel sheet according to claim 6, wherein the steel sheet has a thickness of 60 to 90 mm.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102330017A (en) * | 2011-09-29 | 2012-01-25 | 莱芜钢铁集团有限公司 | Production method of superthick steel plate by using continuous casting billet in condition of small compression ratio |
| CN105755375A (en) * | 2016-04-19 | 2016-07-13 | 江阴兴澄特种钢铁有限公司 | Low-compression-ratio high-performance ultra-thick steel plate produced by continuous casting billet and manufacturing method of steel plate |
| CN109576466A (en) * | 2018-11-09 | 2019-04-05 | 江阴兴澄特种钢铁有限公司 | A kind of special thick low temperature structure steel plate of low compression ratio and its manufacturing method |
| CN110318008A (en) * | 2019-06-20 | 2019-10-11 | 江阴兴澄特种钢铁有限公司 | A kind of anti-960MPa grades of high strength steel plates of lamellar tearing yield strength of big thickness and its production method |
| CN110423946A (en) * | 2019-09-02 | 2019-11-08 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of low compression ratio super-high strength steel Q960E special heavy plate |
| CN110438396A (en) * | 2019-07-31 | 2019-11-12 | 江阴兴澄特种钢铁有限公司 | The special thick container steel of a kind of low compression ratio, high-performance Q 345R ultra-wide and its manufacturing method |
| CN110629002A (en) * | 2019-10-17 | 2019-12-31 | 山东钢铁集团日照有限公司 | Method for producing low-compression-ratio lamellar tearing-resistant extra-thick plate based on TMCP (thermal mechanical control processing) |
| CN111020349A (en) * | 2019-10-18 | 2020-04-17 | 江阴兴澄特种钢铁有限公司 | Manufacturing method of 150-doped 200 mm-thick normalized easy-to-weld hydroelectric steel plate |
-
2020
- 2020-07-08 CN CN202010652883.XA patent/CN111748678B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102330017A (en) * | 2011-09-29 | 2012-01-25 | 莱芜钢铁集团有限公司 | Production method of superthick steel plate by using continuous casting billet in condition of small compression ratio |
| CN105755375A (en) * | 2016-04-19 | 2016-07-13 | 江阴兴澄特种钢铁有限公司 | Low-compression-ratio high-performance ultra-thick steel plate produced by continuous casting billet and manufacturing method of steel plate |
| CN109576466A (en) * | 2018-11-09 | 2019-04-05 | 江阴兴澄特种钢铁有限公司 | A kind of special thick low temperature structure steel plate of low compression ratio and its manufacturing method |
| CN110318008A (en) * | 2019-06-20 | 2019-10-11 | 江阴兴澄特种钢铁有限公司 | A kind of anti-960MPa grades of high strength steel plates of lamellar tearing yield strength of big thickness and its production method |
| CN110438396A (en) * | 2019-07-31 | 2019-11-12 | 江阴兴澄特种钢铁有限公司 | The special thick container steel of a kind of low compression ratio, high-performance Q 345R ultra-wide and its manufacturing method |
| CN110423946A (en) * | 2019-09-02 | 2019-11-08 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of low compression ratio super-high strength steel Q960E special heavy plate |
| CN110629002A (en) * | 2019-10-17 | 2019-12-31 | 山东钢铁集团日照有限公司 | Method for producing low-compression-ratio lamellar tearing-resistant extra-thick plate based on TMCP (thermal mechanical control processing) |
| CN111020349A (en) * | 2019-10-18 | 2020-04-17 | 江阴兴澄特种钢铁有限公司 | Manufacturing method of 150-doped 200 mm-thick normalized easy-to-weld hydroelectric steel plate |
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