CN114892081B - High-thickness 460 MPa-level steel plate with excellent low-temperature toughness for ocean engineering and production method thereof - Google Patents
High-thickness 460 MPa-level steel plate with excellent low-temperature toughness for ocean engineering and production method thereof Download PDFInfo
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- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- 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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- 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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Abstract
The invention discloses a large-thickness 460 MPa-level steel plate for ocean engineering with excellent low-temperature toughness and a production method thereof. The steel plate comprises the following chemical components of, by weight, C=0.06-0.09%, si=0.15-0.35%, mn=1.50-1.80%, cr=0.15-0.30%, al=0.02-0.03%, nb+V+Ti 0.05-0.09%, cu=0.05-0.2%, zr=0.008-0.02%, ceq is less than or equal to 0.46%, and the balance Fe and unavoidable impurities, wherein the steel plate structure is a bainitic structure. According to the 460 MPa-level steel plate, the microstructure with high large-angle grain boundary proportion is obtained mainly by regulating and controlling heat treatment process parameters, the thickness of the prepared steel plate is 80-100 mm, and the impact energy at the core part of the steel plate at the temperature of 40 ℃ below zero is more than 270J.
Description
Technical Field
The invention belongs to the technical field of steel production, and relates to a large-thickness 460 MPa-level steel plate for ocean engineering with excellent low-temperature toughness and a production method thereof.
Background
Due to the complex and severe use environment of ocean engineering, the performance requirements of the ocean engineering steel are much higher than those of other steel types. In addition to conventional strength, plasticity and weldability, marine steel is required to have high low-temperature impact toughness. With the development of polar resources and the large-scale development of ocean engineering in the international society, the thickness of the steel plate for ocean engineering is gradually increased, and when the TMCP process is used for production, the cooling speed of the steel plate core structure is low, the quenching is difficult to complete, pearlite is easy to appear, and the low-temperature toughness of the steel plate core is seriously affected.
CN 110983154a discloses a structural steel plate with super-thick high toughness and yield of 460MPa grade and a production method thereof, and the alloy components are designed as follows: 0.12-0.14% of C, 0.20-0.40% of Si, 1.35-1.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.5-0.7% of Ni, 0.030-0.040% of Nb, 0.050-0.065% of V, 0.25-0.30% of Cr and 0.020-0.040% of Alt. And an off-line quenching and tempering process is adopted, so that the yield strength of the obtained super-thick high-toughness structural steel plate with the yield of 460MPa level in the quenched and tempered state at the position of 1/4 of the plate thickness is 490-610 MPa, the tensile strength is 590-651 MPa, and the impact energy at the temperature of minus 40 ℃ is 120-158J. However, this patent does not apply for protection of heat treatment process parameters, and the maximum plate thickness is 140mm, and uniformity in the thickness direction is difficult to stabilize.
CN 108914005a discloses an extra thick corrosion-resistant steel plate with high yield strength >460MPa and excellent low-temperature toughness and a production method thereof, and the alloy components are designed as follows: 0.146-0.182% of C, 0.36-0.58% of Si, 2.02-2.35% of Mn, 0.041-0.062% of Nb, 0.121-0.162% of V, 0.022-0.051% of Ti, 0.76-1.02% of Cu, 0.77-1.08% of Ni, 0.0013-0.0034% of Hf, 0.0024-0.0076% of Mg, less than or equal to 0.010% of P, less than or equal to 0.003% of S, and the balance of Fe and unavoidable impurities. The rolling pass reduction rate and the cooling rate are strictly controlled by adopting a controlled rolling and cooling plus normalizing process, the yield strength of the obtained corrosion-resistant steel plate with the thickness of 120-130 mm and the low-temperature toughness at 1/4 position is 485-495 MPa, the tensile strength is 595-640 MPa, and the impact energy at-40 ℃ is 255-270J. However, the alloy component of the corrosion-resistant super-thick steel plate protected by the patent relates to rare technology Hf, so that smelting cost is increased.
The patents relate to low alloy high strength corrosion resistant steel for ocean engineering, and the contents of micro alloy elements such as Nb, V, ti and the like are increased, so that the hardenability of the steel plate is improved, but when the thickness is more than 80mm, the core of the steel plate is easy to generate granular MA structure, and the improvement of the low temperature toughness of the core is seriously affected. The carbon content of the steel plate is more than 0.12%, and part of steel alloy components contain higher Cu element, which is unfavorable for the weldability of the steel plate. Therefore, the alloy components of the steel plate with large thickness need to be redesigned, the microstructure of the steel plate core is regulated and controlled by controlling the heat treatment process parameters, and the low-temperature toughness of the steel plate for the ocean engineering with large thickness of 460MPa level is improved.
Disclosure of Invention
The invention aims to provide a large-thickness 460 MPa-level steel plate for ocean engineering with excellent low-temperature toughness and a production method thereof, so as to meet the requirement of good matching of the toughness of the ocean engineering steel at the present stage, wherein the yield strength of the steel plate at the position of 1/2 of the thickness is more than or equal to 460MPa, the tensile strength is more than or equal to 640MPa, the elongation is more than or equal to 17%, and the impact energy at the temperature of minus 40 ℃ is more than 270J.
The technical scheme of the invention is as follows:
the steel plate for the large-thickness 460 MPa-level ocean engineering with excellent low-temperature toughness and the production method thereof are characterized in that the thickness of the produced steel plate is 80-100 mm, the mass percentage of chemical components of the steel plate is C=0.06-0.09%, si=0.15-0.35%, mn=1.50-1.80%, cr=0.15-0.30%, al=0.02-0.03%, nb+V+Ti is 0.05-0.09%, cu=0.05-0.2%, zr=0.008-0.02%, ceq is less than or equal to 0.46%, and the balance Fe and unavoidable impurities, and the steel plate structure is a bainitic structure; the key production process comprises the following steps:
(1) And (3) rolling: adopting a two-stage rolling process, wherein the initial rolling temperature in the rough rolling stage is 1000+/-50 ℃, the finish rolling temperature in the finish rolling stage is 730+/-20 ℃, and water cooling is carried out after rolling;
(2) Quenching process: the quenching temperature is (Ac 3-20 ℃) to Ac3 ℃, and the quenching heat preservation time coefficient is 1.8-2.5 min/mm;
(3) Tempering: and tempering the steel plate by using a radiant tube type non-oxidation heating furnace, wherein the tempering temperature is 450-550 ℃, the heating rate is 1.6-2.0 min/mm, the tempering heat preservation time coefficient is 2.5-3.5 min/mm, the cooling speed is 10-14 ℃/s after tempering, and the steel plate is cooled to room temperature.
The quenching temperature is (Ac 3-20) DEG C-Ac 3℃, which means that the steel plate is subjected to sub-temperature quenching within the range of 20 ℃ below the complete austenitizing temperature to form a small amount of ferrite so as to improve the proportion of large-angle grain boundaries in the structure. Wherein Ac3 refers to the complete austenitizing temperature of the steel. For example, if Ac3 of the steel is 915 ℃, the quenching temperature (Ac 3-20) to Ac3 ℃ should be 895 ℃ to 915 ℃.
The heating rate refers to the ratio of time (min) of heat treatment of the steel plate in a furnace according to the thickness (mm) of the plate blank, and the unit is min/mm. For example, if the temperature rise rate is 1.6 to 2.0min/mm, the temperature rise time of a steel sheet 100mm thick should be 160 to 200min.
The heat preservation time coefficient refers to the heat preservation time min ratio of a steel plate which is determined according to the thickness (mm) of the plate blank when the steel plate is quenched or tempered in a furnace, and the unit is min/mm. For example, the heat preservation time coefficient is 1.8-2.5 min/mm, and the heat preservation time of a steel plate with the thickness of 100mm is 180-250 min.
The yield strength of the steel plate produced by the method at the position of 1/2 of the thickness is more than or equal to 460MPa, the tensile strength is more than or equal to 640MPa, the elongation is more than or equal to 17 percent, and the impact energy at minus 40 ℃ is more than 270J.
The invention has the beneficial effects that: the content of carbon reduction elements is reduced to 0.06-0.09% in chemical composition design, so that the uniformity and weldability of the large-thickness 460 MPa-level steel plate structure for ocean engineering are improved; by controlling the quenching temperature, the proportion of large-angle grain boundaries in the steel plate structure is increased, so that the expansion of cracks in the impact process is prevented, and the low-temperature toughness of the steel plate is improved.
Drawings
FIG. 1 is a microstructure morphology of a 1/2 position of a quenched and tempered steel plate of an 80mm thick 460MPa grade steel plate of example 1.
FIG. 2 is a fracture morphology of an impact test specimen at a position 1/2 of the thickness of a quenched and tempered steel plate of a 460MPa grade steel plate with a thickness of 80mm in example 1.
FIG. 3 is a microstructure morphology of a 1/2 position of a quenched and tempered steel plate of a 460MPa grade steel plate with a thickness of 100mm in example 2.
FIG. 4 is a fracture morphology of an impact specimen at a position 1/2 of the thickness of a quenched and tempered steel plate of a 460MPa grade steel plate with a thickness of 100mm in example 2.
Detailed Description
The invention will be further described with reference to the drawings and the specific examples.
Example 1
Production of 460 MPa-grade steel plates for ocean engineering, wherein the thickness of the steel plates is 80mm, and the mass percentages of chemical components of the steel are shown in table 1; the production process comprises the working procedures of smelting, continuous casting, heating, rolling, quenching and tempering, and the key steps are as follows:
(1) And (3) rolling: adopting two-stage rolling, wherein the initial rolling temperature of rough rolling is 990 ℃, the initial rolling temperature of finish rolling is 727 ℃, and water cooling is carried out after rolling;
(2) Quenching process: quenching temperature is 900 ℃ (the Ac3 temperature of the example is 913 ℃), the heat preservation time coefficient is 2.2min/mm, the heat preservation time is 176min, the cooling speed is 13.8 ℃/s, and the cooling is carried out to room temperature;
(3) Tempering: the tempering temperature is 450 ℃, the heating rate is 2.0min/mm, the heating time is 160min, the heat preservation time coefficient is 3.0min/mm, the heat preservation time is 240min, and the cooling speed is 11 ℃/s after the tempering is finished.
The microstructure of the 460 MPa-grade steel plate for ocean engineering with excellent low-temperature toughness at the 1/2 position is shown in figure 1, the microstructure is shown as a bainite structure in figure 1, various mechanical property indexes are shown in table 2, and the morphology of an impact sample at-40 ℃ is shown in figure 2.
Example 2
The production of 460MPa grade steel plates for ocean engineering, wherein the thickness of the steel plates is 100mm, and the mass percentages of chemical components are shown in table 1; the production process comprises the working procedures of smelting, continuous casting, heating, rolling, quenching and tempering, and the key process steps comprise:
(1) And (3) rolling: adopting two-stage rolling, wherein the initial rolling temperature of rough rolling is 1050 ℃, the initial rolling temperature of finish rolling is 741 ℃, and water cooling is carried out after rolling;
(2) Quenching process: the quenching temperature is 930 ℃ (the Ac3 temperature of the example is 948 ℃), the heat preservation time coefficient is 1.9min/mm, the heat preservation time is 190min, the cooling medium is water, the cooling speed is 14 ℃/s, and the cooling is carried out to the room temperature;
(3) Tempering: the tempering temperature is 500 ℃, the heating rate is 1.7min/mm, the heating time is 170min, the heat preservation time coefficient is 3.0min/mm, the heat preservation time is 300min, and the cooling speed is 13 ℃/s after the tempering is finished.
The microstructure of the 460 MPa-grade steel plate for ocean engineering with excellent low-temperature toughness at the 1/2 position is shown in fig. 3, the microstructure is shown as a bainite structure in fig. 3, various mechanical property indexes are shown in table 2, and the morphology of an impact sample at-40 ℃ is shown in fig. 4.
Table 1 chemical composition and percentage (%)
。
Table 2 mechanical properties of the steel sheet of example after heat treatment
。
Claims (1)
1. A production method of a large-thickness 460 MPa-level steel plate for ocean engineering with excellent low-temperature toughness is characterized in that the thickness of the produced steel plate is 80-100 mm: the steel plate comprises the following chemical components, by weight, C=0.06-0.09%, si=0.15-0.35%, mn=1.50-1.80%, cr=0.15-0.30%, al=0.02-0.03%, nb+V+Ti 0.05-0.09%, cu=0.05-0.2%, zr=0.008-0.02%, ceq is less than or equal to 0.46%, and the balance Fe and unavoidable impurities; the steel plate structure is a bainite structure, the yield strength of the steel plate at the position of 1/2 of the thickness is more than or equal to 460MPa, the tensile strength is more than or equal to 640MPa, the elongation is more than or equal to 17%, and the impact energy at minus 40 ℃ is more than 270J; the key production process comprises the following steps:
(1) And (3) rolling: adopting a two-stage rolling process, wherein the initial rolling temperature in the rough rolling stage is 1000+/-50 ℃, the finish rolling temperature in the finish rolling stage is 730+/-20 ℃, and water cooling is carried out after rolling;
(2) Quenching process: quenching temperature is Ac 3-20-Ac 3 ℃, and heat preservation time coefficient is 1.8-2.5 min/mm;
(3) Tempering: and tempering the steel plate by using a radiant tube type non-oxidation heating furnace, wherein the tempering temperature is 450-550 ℃, the heating rate is 1.6-2.0 min/mm, the tempering heat preservation time coefficient is 2.5-3.5 min/mm, and the cooling speed is 10-14 ℃/s after tempering.
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| CN102409260A (en) * | 2010-09-21 | 2012-04-11 | 鞍钢股份有限公司 | Thick plate with good low-temperature toughness for pressure container and production method of thick plate |
| CN102127719B (en) * | 2011-03-10 | 2012-11-14 | 东北大学 | Thick steel plate for ocean platform structure with yield strength of 500MPa grade and manufacture method thereof |
| CN102277539A (en) * | 2011-08-01 | 2011-12-14 | 南京钢铁股份有限公司 | High-strength steel with low yield ratio, high plasticity and ultrafine grain and preparation method thereof |
| CN103774050A (en) * | 2012-10-25 | 2014-05-07 | 吴雪 | High-ductility steel with low yield ratio |
| CN103014541A (en) * | 2012-12-21 | 2013-04-03 | 首钢总公司 | 690MPa thick steel plate for ocean engineering and manufacturing method of steel plate |
| CN103276314B (en) * | 2013-05-17 | 2015-03-11 | 武汉钢铁(集团)公司 | X80 pipeline steel plate with low yield ratio and high toughness and manufacturing method thereof |
| CN103938108B (en) * | 2014-03-14 | 2016-05-11 | 济钢集团有限公司 | A kind of 460MPa level low compression ratio high-tenacity steel plate for ocean engineering and production method |
| CN104404384B (en) * | 2014-12-19 | 2016-08-24 | 山东钢铁股份有限公司 | A kind of 550MPa level low compression ratio high tenacity ocean engineering Platform Steel plate and production method |
| CN104532147B (en) * | 2014-12-24 | 2016-10-26 | 舞阳钢铁有限责任公司 | Fixing offshore platform S460G2+QT steel plate and production method thereof |
| CN106319390B (en) * | 2015-06-16 | 2018-02-27 | 鞍钢股份有限公司 | A kind of X70 large-deformation-resistance pipeline steels and manufacture method |
| CN104988429B (en) * | 2015-07-13 | 2017-05-10 | 武汉钢铁(集团)公司 | Structure steel plate for bridge with yield strength being 690MPa and production method thereof |
| CN105441799B (en) * | 2015-11-25 | 2017-05-24 | 武汉钢铁(集团)公司 | High-toughness and low-yield-ratio quenched and tempered steel plate used in low-temperature environment and manufacturing method of high-toughness and low-yield-ratio quenched and tempered steel plate |
| CN110983154A (en) * | 2019-10-30 | 2020-04-10 | 舞阳钢铁有限责任公司 | Extra-thick high-toughness 460 MPa-level yield structural steel plate and production method thereof |
| CN111500941B (en) * | 2020-05-15 | 2021-06-29 | 佛山科学技术学院 | HIC (hydrogen induced cracking) resistant pipeline steel based on structure regulation and preparation method thereof |
| CN113174535B (en) * | 2021-04-13 | 2022-07-19 | 鞍钢股份有限公司 | Large-thickness quenched and tempered FO460 steel plate for ships and manufacturing method thereof |
| CN113549822B (en) * | 2021-06-29 | 2022-06-14 | 鞍钢股份有限公司 | High-performance steel plate for resisting marine atmospheric corrosion and production method thereof |
| CN113549828B (en) * | 2021-07-13 | 2022-11-18 | 鞍钢股份有限公司 | Low-yield-ratio ultrahigh-strength marine steel and manufacturing method thereof |
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