WO2023246905A1 - 一种高扩孔超高塑性钢及其制造方法 - Google Patents

一种高扩孔超高塑性钢及其制造方法 Download PDF

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WO2023246905A1
WO2023246905A1 PCT/CN2023/101853 CN2023101853W WO2023246905A1 WO 2023246905 A1 WO2023246905 A1 WO 2023246905A1 CN 2023101853 W CN2023101853 W CN 2023101853W WO 2023246905 A1 WO2023246905 A1 WO 2023246905A1
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steel
content
present
temperature
rolling
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English (en)
French (fr)
Chinese (zh)
Inventor
王焕荣
张晨
杨阿娜
庞厚君
范佳杰
陆敏
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Priority to KR1020257002062A priority Critical patent/KR20250025471A/ko
Priority to JP2024574816A priority patent/JP2025521329A/ja
Priority to EP23826550.8A priority patent/EP4527964A4/en
Publication of WO2023246905A1 publication Critical patent/WO2023246905A1/zh
Anticipated expiration legal-status Critical
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    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
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    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
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    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
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    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
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Definitions

  • the invention belongs to the field of steel and its manufacturing method, and particularly relates to a highly expanded and ultra-high plasticity steel and its manufacturing method.
  • Chinese patent CN104233092A provides a 780MPa grade ultra-high plasticity steel. Its composition is designed to be low carbon and high silicon. At the same time, a certain amount of precious alloy elements such as Cr, Mo, and Nb are added, so the alloy cost is relatively high.
  • the above-mentioned steel also contains at least one selected from the group consisting of Mo, Cu, Ni, Cr, Nb, V, and B, wherein, in terms of mass percentage, Mo ⁇ 0.5%, Cu ⁇ 0.5%, Ni ⁇ 0.5%, Cr ⁇ 0.5%, Nb ⁇ 0.06%, V ⁇ 0.10%, B ⁇ 0.001%.
  • Niobium is one of the additive elements in the present invention. Niobium is similar to titanium and is a strong carbide element in steel. The addition of niobium to steel can greatly increase the non-recrystallization temperature of the steel. During the finishing rolling stage, deformed austenite with a higher dislocation density can be obtained. In the subsequent transformation process The final phase change structure can be refined. However, the amount of niobium added should not be too much. On the one hand, if the amount of niobium added exceeds 0.06%, it is easy to form relatively coarse niobium carbonitrides in the structure, which is detrimental to the impact toughness of the steel. At the same time, the high content of niobium can easily cause anisotropy of the hot-rolled austenite structure. Therefore, the niobium content in the steel of the present invention is ⁇ 0.06%.
  • Boron is one of the addable elements in the present invention. Boron can greatly improve the hardenability of steel and is conducive to obtaining a martensite structure. Considering that the structure expected to be obtained in the hot rolling stage of the present invention is bainite, the content of boron in the steel needs to be strictly controlled to prevent the formation of martensite due to excessive addition of boron. Therefore, the amount of boron in the steel of the present invention is Adding amount ⁇ 0.001%.
  • the present invention can provide two steel products with different mechanical properties through the combination of C and V contents in the steel.
  • the content of C in the steel is 0.10 ⁇ 0.25% and the content of V is 0.10 ⁇ 0.30%
  • the tensile strength of the steel is ⁇ 780MPa
  • the elongation is ⁇ 30%
  • the hole expansion rate is ⁇ 65%
  • C when the content is 0.25-0.35% and the content of V is 0.30-0.50%, the tensile strength of the steel is ⁇ 980MPa, the elongation is ⁇ 25%, and the hole expansion rate is ⁇ 50%.
  • the structure of the above-mentioned steel is bainite and retained austenite with a content of ⁇ 5%, preferably 5-15%, more preferably 5-12%, wherein the bainite contains nano-precipitated VC.
  • the steel structure types in the present invention are mainly bainite and retained austenite, and the bainitic ferrite in the bainite contains nanocarbide. Bainite and nanoprecipitation give the steel plate high yield strength and tensile strength, and retained austenite gives the steel plate ultra-high elongation.
  • the yield strength of the above-mentioned steel is above 700 MPa.
  • the yield strength of the steel of the present invention is less than 900MPa, the tensile strength is less than 1100MPa, the elongation is less than 25%, and the hole expansion rate is less than 100%. Down.
  • Another aspect of the present invention provides a method for manufacturing the above-mentioned steel, comprising the following steps:
  • the molten steel is smelted in a converter or electric furnace, then refined in a vacuum furnace, and then cast into a slab or ingot;
  • the rolling temperature is 1000-1100°C
  • the intermediate billet is obtained by rolling under high pressure in multiple passes above 1000°C with a cumulative deformation of ⁇ 50%.
  • the intermediate billet is then heated to 950-1000°C, and then the final 3 steps are performed.
  • the final rolling temperature is between 800 and 950°C to obtain a steel strip;
  • Controlled cooling is used for cooling. After final rolling, the above-mentioned steel strip is water-cooled to a temperature between 400 and 550°C at a cooling rate of ⁇ 10°C/s for coiling, and then the steel coil is cooled to room temperature.
  • the above method also includes step 4) pickling, wherein the pickling operating speed of the above-mentioned steel strip is 30-140m/min, the pickling temperature is controlled at 75-85°C, and the tensile straightening rate is controlled at ⁇ 3%. Rinse in the temperature range of 35 to 50°C, dry and oil the surface between 120 and 140°C.
  • the invention adopts innovative medium-low carbon high vanadium composition design, combined with innovative hot-rolling medium-temperature coiling control technology and nano-precipitation and bainite phase transformation matching technology, to obtain higher yield strength and high resistance at different strength levels.
  • Advanced high-strength steel characterized by tensile strength, ultra-high plasticity and high hole expansion rate. Higher carbon content is conducive to obtaining high strength, and at the same time, more available carbon atoms diffuse into the retained austenite, thereby stabilizing the retained austenite.
  • the main purpose of adding a higher silicon content is to suppress the formation of carbides during bainitic transformation; a higher manganese content can further improve the stability of retained austenite; coiling at 400-550°C after final rolling is mainly It is to obtain carbide-free bainite and retained austenite structures, and at the same time cooperate with the nano-precipitation of vanadium carbide.
  • the present invention can achieve a good match of ultra-high plasticity and high hole expansion rate at different strength levels, while ensuring tensile strength ⁇ 780MPa and On the basis of ⁇ 980MPa, the elongation rate is ⁇ 30% and ⁇ 25%, and the hole expansion rate is ⁇ 65% and ⁇ 50% respectively.
  • the solution of the present invention has the following advantages or beneficial effects:
  • the present invention adopts a medium-low carbon, high-silicon and low-aluminum design in the composition design, which is different from traditional hot-rolled ultra-high plasticity steel with low carbon, high silicon and low silicon and high aluminum compositions.
  • the design is different.
  • Chinese patent CN104233092A also adds Cr, Mo, Nb and other precious metal elements to the steel, so the alloy cost is high.
  • the invention adopts an innovative medium-low carbon and high vanadium composition design, combined with a medium-temperature coiling process, and through precise composition and process coordination, ultra-high plasticity advanced high-strength steel with high yield strength and high hole expansion characteristics can be obtained.
  • the yield strength of the highly expanded and ultra-high plasticity steel obtained using the technology provided by the present invention can reach more than 700MPa, or even more than 800MPa, and the tensile strength can reach more than 780MPa, or even more than 980MPa.
  • the thickness of the hot-rolled pickling product of the present invention is 1.5-8.0mm, and at the same time it has high yield strength, ultra-high elongation (A is above 25%, or even above 30%) and high hole expansion rate (in Above 50%, even above 65%).
  • the steel of the present invention has excellent mechanical properties and shows a good match between yield strength, tensile strength, plasticity, hole expansion performance and formability. It can be used in the manufacture of various complex parts for passenger cars or commercial vehicles and has good Application prospects.
  • Figure 1 is a schematic diagram of the steel rolling process of the present invention
  • Figure 2 is a metallographic photograph of the steel in Example 1 of the present invention.
  • Figure 4 is a metallographic photograph of the steel in Example 5 of the present invention.
  • Figure 5 is a metallographic photograph of the steel in Example 7 of the present invention.
  • Table 1 The components of the steels in the examples and comparative examples of the present invention are shown in Table 1.
  • the balance of the components in Table 1 is Fe and inevitable impurities.
  • Table 2 shows the production process parameters of the steel according to the embodiment of the present invention, and Table 3 shows the performance parameters of the steel according to the embodiment of the present invention.
  • the molten steel is smelted in a converter or electric furnace according to the composition shown in Table 1, and then refining in a vacuum furnace and then cast into a slab or ingot.
  • the opening rolling temperature is 1000 ⁇ 1100°C, rolling under high pressure in multiple passes above 1000°C and the cumulative deformation is ⁇ 50% to obtain an intermediate billet.
  • the above intermediate billet is then heated to 950 ⁇ 1000°C, and then the final 3 ⁇ After 5 passes of rolling and the cumulative deformation is ⁇ 70%, the final rolling temperature is between 800 and 950°C to obtain a steel strip;
  • Controlled cooling is used for cooling. After final rolling, the above-mentioned steel strip is water-cooled to a temperature between 400 and 550°C at a cooling rate of ⁇ 10°C/s for coiling, and then the steel coil is cooled to room temperature.
  • Table 2 shows the production process parameters of steel according to the embodiment of the present invention.
  • the steel in Comparative Examples 1-3 of the present invention is selected from CN104233092A, and the steel in Comparative Example 4 is selected from another patent application CN114107792A of the applicant.
  • Figures 2 to 5 show the metallographic photos of the hot-rolled steels of Examples 1, 3, 5 and 7 respectively. It can be clearly seen from the figure that by using the composition and process path designed in the present invention, a structure mainly composed of bainite and retained austenite can be obtained, showing high yield strength, high tensile strength, and ultra-high yield strength. A good match of high plasticity and high hole expansion rate, with excellent comprehensive performance.
  • the yield strength of the steel of the present invention meets ⁇ 700MPa and ⁇ 800MPa, the tensile strength ⁇ 780MPa and ⁇ 980MPa, the elongation ⁇ 30% and ⁇ 25%, and the hole expansion rate ⁇ 65% and ⁇ 50 %.
  • the high-pore-expanding ultra-high plasticity steel of the present invention has good strength, super-plasticity and high-expansion properties, is particularly suitable for parts that require complex forming, such as automobile chassis structures, and has broad application prospects.

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  • Crystallography & Structural Chemistry (AREA)
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  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
PCT/CN2023/101853 2022-06-22 2023-06-21 一种高扩孔超高塑性钢及其制造方法 Ceased WO2023246905A1 (zh)

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JP2024574816A JP2025521329A (ja) 2022-06-22 2023-06-21 穴拡げ率が高く、かつ、可塑性が極めて高い鋼およびその製造方法
EP23826550.8A EP4527964A4 (en) 2022-06-22 2023-06-21 STEEL WITH HIGH HOLE EXPANSION RATIO AND ULTRA-HIGH PLASTICITY AND METHOD FOR MANUFACTURING THE SAME

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