WO2020228232A1 - Plaque d'acier pour pont haute performance de type tmcp avec une limite d'élasticité de 370 mpa et son procédé de fabrication - Google Patents

Plaque d'acier pour pont haute performance de type tmcp avec une limite d'élasticité de 370 mpa et son procédé de fabrication Download PDF

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WO2020228232A1
WO2020228232A1 PCT/CN2019/110795 CN2019110795W WO2020228232A1 WO 2020228232 A1 WO2020228232 A1 WO 2020228232A1 CN 2019110795 W CN2019110795 W CN 2019110795W WO 2020228232 A1 WO2020228232 A1 WO 2020228232A1
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vacuum
rolling
temperature
steel plate
continuous casting
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PCT/CN2019/110795
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Chinese (zh)
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李伟
洪君
丁叶
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南京钢铁股份有限公司
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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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
    • 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
    • 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
    • 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
    • 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
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite

Definitions

  • the invention relates to the technical field of steel smelting, in particular to a TMCP type high-performance bridge steel plate with a yield of 370 MPa and a production method.
  • the present invention provides a TMCP-type high-performance bridge steel plate with a yield of 370MPa.
  • the chemical composition and mass percentage are as follows: C: 0.08% ⁇ 0.14%, Si: 0.20% ⁇ 0.30%, Mn: 1.35% ⁇ 1.50 %, P ⁇ 0.015%, S ⁇ 0.005%, Ni ⁇ 0.18%, Cr ⁇ 0.18%, Nb: 0.020% ⁇ 0.035%, Alt: 0.025% ⁇ 0.050%, Ti: 0.008% ⁇ 0.020%, the balance is Fe And inevitable impurities.
  • the present invention optimizes the composition design, adopts low-carbon, micro-Nb, low-carbon equivalent composition design and TMCP production process, and gives full play to the two effects of Nb on ferrite grain refinement and precipitation strengthening during the controlled rolling and controlled cooling process.
  • the research and development of high-performance Q370 bridge steel with excellent mechanical properties and welding properties shortens the process flow and reduces alloy costs.
  • the maximum thickness of the finished steel plate is 80mm, and when the thickness H is 10 ⁇ H ⁇ 50mm, Ni:0%, Cr:0%; when the thickness H is 50 ⁇ H ⁇ 80mm , Ni: 0.10% ⁇ 0.18%, Cr: 0.10% ⁇ 0.18%.
  • Another object of the present invention is to provide a TMCP type yielding 370MPa high-performance bridge steel plate production method, including smelting, continuous casting, heating, controlled rolling and controlled cooling processes,
  • the smelting and continuous casting processes specifically include molten iron desulfurization pretreatment, converter smelting, LF refining, RH vacuum treatment and continuous casting.
  • molten iron desulfurization pretreatment S ⁇ 0.003%
  • converter smelting adopts double slag method to control P ⁇ 0.012%
  • LF refining White slag is used for desulfurization and deoxidation
  • the vacuum degree is 5.0mbar and the vacuum time is more than 12 minutes during RH vacuum treatment
  • calcium treatment is carried out after the vacuum is over, and the calcium treatment is statically stirred for more than 10 minutes;
  • the heating process adopts 150-260mm thick continuous casting billet, the total furnace time is calculated at 8-16min/cm, the soaking time is calculated at 1.4min/cm or more, and the tapping temperature is 1160-1230°C;
  • the controlled rolling and controlled cooling process adopts a two-stage controlled rolling process of austenite recrystallized zone + unrecrystallized zone for rolling.
  • the final rolling temperature of the rough rolling in the first stage is controlled to 1000 ⁇ 1100°C, and the start rolling temperature of the second stage is 840 ⁇ 920°C, the final rolling temperature is 780 ⁇ 860°C, after rolling, DQ ultra-fast cooling is used for rapid cooling, the cooling rate is 3 ⁇ 5°C/s, and the redness temperature is 540 ⁇ 660°C.
  • the aforementioned TMCP type yielding 370MPa high-performance bridge steel plate production method the thickness of the finished steel plate is 16mm, and its chemical composition and mass percentage are as follows: The thickness of the finished steel plate is 16mm, and its chemical composition and mass percentage are as follows: C: 0.09% ⁇ 0.11% , Si: 0.2% ⁇ 0.3%, Mn: 1.43% ⁇ 1.50%, P ⁇ 0.015%, S ⁇ 0.005%, Ti: 0.01% ⁇ 0.02%, Nb: 0.025% ⁇ 0.035%, Alt: 0.028% ⁇ 0.038% , Ceq: 0.35% ⁇ 0.38%, the balance is Fe and other inevitable impurities;
  • the total heating time of the continuous casting billet is 274min, the soaking time is 66min, and the tapping temperature is 1194°C; the two-stage controlled rolling technology of austenite recrystallized zone and austenite non-recrystallized zone is adopted, the first stage The rough rolling opening temperature is 1080°C, the second stage finishing rolling opening temperature is 935°C, and the final rolling temperature is 814°C. After finishing rolling, ultra-fast cooling and rapid cooling are carried out, the cooling rate is 3°C/s, and the redness temperature is 654°C. .
  • the thickness of the finished steel plate is 48mm, and its chemical composition and mass percentage are as follows: the thickness of the finished steel plate is 48mm, and its chemical composition and mass percentage are as follows: C: 0.12% ⁇ 0.14% , Si: 0.2% ⁇ 0.3%, Mn: 1.35% ⁇ 1.45%, P ⁇ 0.015%, S ⁇ 0.005%, Ti: 0.01% ⁇ 0.02%, Nb: 0.025% ⁇ 0.035%, Alt: 0.032% ⁇ 0.042% , Ceq: 0.35% ⁇ 0.38%, the balance is Fe and other inevitable impurities;
  • the molten steel undergoes desulfurization pretreatment, converter smelting, LF refining, RH vacuum treatment, and then continuous casting is cast into a 260mm thick continuous casting billet.
  • the control S ⁇ 0.003%
  • the converter smelting adopts the double slag method to control P ⁇ 0.012 %
  • LF refining adopts white slag operation for desulfurization and deoxidation.
  • the vacuum degree is 5.0 mbar and the vacuum time is more than 12 minutes.
  • the calcium treatment is performed, and the calcium treatment is completed and statically stirred for more than 10 minutes;
  • the total heating time of the continuous casting billet is 269min, the soaking time is 44min, and the tapping temperature is 1172°C; the two-stage controlled rolling technology of austenite recrystallization zone and austenite non-recrystallization zone is adopted, the first stage The rough rolling opening temperature is 1072°C, the second stage finishing rolling opening temperature is 865°C, and the final rolling temperature is 807°C. After finishing rolling, ultra-rapid cooling is carried out. The cooling rate is 4°C/s and the redness temperature is 634°C. .
  • the thickness of the finished steel plate is 80mm, and its chemical composition and mass percentage are as follows: the thickness of the finished steel plate is 80mm, and its chemical composition and mass percentage are as follows: C: 0.08% ⁇ 0.10% , Si: 0.2% ⁇ 0.3%, Mn: 1.4% ⁇ 1.5%, P ⁇ 0.015%, S ⁇ 0.005%, Ti: 0.008% ⁇ 0.018%, Nb: 0.02% ⁇ 0.03%, Alt: 0.03% ⁇ 0.04% , Ni: 0.10% ⁇ 0.18%, Cr: 0.10% ⁇ 0.18%, Ceq: 0.35% ⁇ 0.38%, the balance is Fe and other unavoidable impurities;
  • the molten steel undergoes desulfurization pretreatment, converter smelting, LF refining, RH vacuum treatment, and then continuous casting is cast into a 260mm thick continuous casting billet.
  • the control S ⁇ 0.003%
  • the converter smelting adopts the double slag method to control P ⁇ 0.012 %
  • LF refining adopts white slag operation for desulfurization and deoxidation.
  • the vacuum degree is 5.0 mbar and the vacuum time is more than 12 minutes.
  • the calcium treatment is performed, and the calcium treatment is completed and statically stirred for more than 10 minutes;
  • the total heating time of the continuous casting billet is 274min, the soaking time is 66min, and the tapping temperature is 1194°C; the two-stage controlled rolling technology of austenite recrystallized zone and austenite non-recrystallized zone is adopted, the first stage The rough rolling opening temperature is 1060°C, the second stage finishing rolling opening temperature is 931°C, and the final rolling temperature is 809°C. After finishing rolling, ultra-fast cooling and rapid cooling are carried out, the cooling rate is 5°C/s, and the redness temperature is 570°C .
  • the present invention produces 370MPa high-performance bridge steel plates with a thickness of 10 to 80mm, adopts TMCP production process, and produces steel plates with high strength, yield strength not less than 370MPa, and excellent low-temperature toughness and plasticity results;
  • the chemical composition design principle adopted in the present invention is: C and Mn elements play the role of solid solution strengthening; the thin plate is strengthened by micro-Nb alloy fine-grained, and the thick plate is added with appropriate amounts of Cr, Ni and other fine-grained elements.
  • the delivery method of the steel plate of the present invention is TMCP, and the TMCP state structure is mainly ferrite + pearlite, no heat treatment is required, and process cost can be saved;
  • the present invention optimizes the composition design, Ceq is 0.35 ⁇ 0.38%, controls the smelting and continuous casting processes, and carries out appropriate heating and controlled rolling and cooling processes.
  • the final steel plate has good mechanical properties, and the yield strength is 400 ⁇ 480MPa, tensile strength between 520 ⁇ 600MPa, elongation >21%, yield ratio ⁇ 0.83, 1/4 plate thickness -20°C longitudinal impact energy ⁇ 200J, product meets GB/T714-2015 "Structural steel for bridges" "standard.
  • Fig. 1 is a morphology diagram of the 1/4 thickness of the steel plate in Example 1 of the present invention
  • Fig. 2 is a morphology diagram of the 1/4 thickness of the steel plate in Example 2 of the present invention.
  • Figure 3 is a morphology diagram of the 1/4 thickness of the steel plate in Example 3 of the present invention.
  • This embodiment provides a TMCP type high-performance bridge steel plate with a yield of 370MPa.
  • the finished steel plate has a thickness of 16mm, and its chemical composition and mass percentage are as follows: C: 0.09% ⁇ 0.11%, Si: 0.2% ⁇ 0.3%, Mn: 1.43% ⁇ 1.50%, P ⁇ 0.015%, S ⁇ 0.005%, Ti: 0.01% ⁇ 0.02%, Nb: 0.025% ⁇ 0.035%, Alt: 0.028% ⁇ 0.038%, Ceq: 0.35% ⁇ 0.38%, the balance is Fe And other inevitable impurities.
  • the total heating time of the continuous casting billet is 274min, the soaking time is 66min, and the tapping temperature is 1194°C; the two-stage controlled rolling technology of austenite recrystallized zone and austenite non-recrystallized zone is adopted, the first stage The rough rolling opening temperature is 1080°C, the second stage finishing rolling opening temperature is 935°C, and the final rolling temperature is 814°C. After finishing rolling, ultra-fast cooling and rapid cooling are carried out, the cooling rate is 3°C/s, and the redness temperature is 654°C. .
  • the mechanical properties of the obtained steel plate are: the yield ratio is 0.82, the yield strength is 459MPa, the tensile strength is 560MPa, the elongation is 24.7%, and the average longitudinal impact energy of 1/4 plate thickness at -20°C is 236J.
  • This embodiment provides a TMCP type high-performance bridge steel plate with a yield of 370 MPa.
  • the finished steel plate has a thickness of 48 mm, and its chemical composition and mass percentage are as follows: C: 0.12% to 0.14%, Si: 0.2% to 0.3%, Mn: 1.35% ⁇ 1.45%, P ⁇ 0.015%, S ⁇ 0.005%, Ti: 0.01% ⁇ 0.02%, Nb: 0.025% ⁇ 0.035%, Alt: 0.032% ⁇ 0.042%, Ceq: 0.35% ⁇ 0.38%, the balance is Fe And other inevitable impurities.
  • the molten steel undergoes desulfurization pretreatment, converter smelting, LF refining, RH vacuum treatment, and then continuous casting is cast into a 260mm thick continuous casting billet.
  • the control S ⁇ 0.003%
  • the converter smelting adopts the double slag method to control P ⁇ 0.012 %
  • LF refining adopts white slag operation for desulfurization and deoxidation.
  • the vacuum degree is 5.0 mbar and the vacuum time is more than 12 minutes.
  • the calcium treatment is performed, and the calcium treatment is completed and statically stirred for more than 10 minutes;
  • the total heating time of the continuous casting billet is 269min, the soaking time is 44min, and the tapping temperature is 1172°C; the two-stage controlled rolling technology of austenite recrystallization zone and austenite non-recrystallization zone is adopted, the first stage The rough rolling opening temperature is 1072°C, the second stage finishing rolling opening temperature is 865°C, and the final rolling temperature is 807°C. After finishing rolling, ultra-rapid cooling is carried out. The cooling rate is 4°C/s and the redness temperature is 634°C. .
  • the mechanical properties of the obtained steel plate are: the yield ratio is 0.80, the yield strength is 433MPa, the tensile strength is 541MPa, the elongation is 23.2%, and the average longitudinal impact energy of 1/4 plate thickness at -20°C is 235J.
  • This embodiment provides a TMCP-type high-performance bridge steel plate with a yield of 370 MPa.
  • the finished steel plate has a thickness of 80mm, and its chemical composition and mass percentage are as follows: C: 0.08% ⁇ 0.10%, Si: 0.2% ⁇ 0.3%, Mn: 1.4% ⁇ 1.5%, P ⁇ 0.015%, S ⁇ 0.005%, Ti: 0.008% ⁇ 0.018%, Nb: 0.02% ⁇ 0.03%, Alt: 0.03% ⁇ 0.04%, Ni: 0.10% ⁇ 0.18%, Cr: 0.10% ⁇ 0.18%, Ceq: 0.35% ⁇ 0.38%, the balance is Fe and other unavoidable impurities.
  • the molten steel undergoes desulfurization pretreatment, converter smelting, LF refining, RH vacuum treatment, and then continuous casting is cast into a 260mm thick continuous casting billet.
  • the control S ⁇ 0.003%
  • the converter smelting adopts the double slag method to control P ⁇ 0.012 %
  • LF refining adopts white slag operation for desulfurization and deoxidation.
  • the vacuum degree is 5.0 mbar and the vacuum time is more than 12 minutes.
  • the calcium treatment is performed, and the calcium treatment is completed and statically stirred for more than 10 minutes;
  • the total heating time of the continuous casting billet is 274min, the soaking time is 66min, and the tapping temperature is 1194°C; the two-stage controlled rolling technology of austenite recrystallized zone and austenite non-recrystallized zone is adopted, the first stage The rough rolling opening temperature is 1060°C, the second stage finishing rolling opening temperature is 931°C, and the final rolling temperature is 809°C. After finishing rolling, ultra-fast cooling and rapid cooling are carried out, the cooling rate is 5°C/s, and the redness temperature is 570°C .
  • the mechanical properties of the obtained steel plate are: the yield ratio is 0.77, the yield strength is 410 MPa, the tensile strength is 532 MPa, the elongation is 22.7%, and the average longitudinal impact energy of 1/4 plate thickness at -20°C is 232J.
  • the mechanical properties of the steel plate obtained in the present invention all meet the performance requirements of Q370qD in the GB/T 714-2015 "Steel for Bridge Structures" standard, and the mechanical properties are excellent and have strong operability.
  • the annual output of TMCP 370MPa high-performance bridge steel plates below 80mm is about 1.7 tons, and the profit per ton of steel is about 300 yuan/ton.
  • the present invention may also have other embodiments. All technical solutions formed by equivalent replacements or equivalent transformations fall within the protection scope of the present invention.

Abstract

L'invention concerne une plaque d'acier pour pont à haute performance de type TMCP avec une limite d'élasticité de 370 MPa, qui se rapporte au domaine technique de la fusion de fer et d'acier. La plaque d'acier pour pont contient les ingrédients chimiques suivants, en pourcentages en masse : C : 0,08 % à 0,14 %, Si : 0,20 % à 0,30 %, Mn : 1,35 % à 1,50 %, P ≤ 0,015 %, S ≤ 0,005 %, Ni ≤ 0,18 %, Cr ≤ 0,18 %, Nb : 0,020 % à 0,035 %, Al(t) : 0,025 % à 0,050 %, Ti : 0,008 à 0,020 %, le reste étant du Fe et d'autres impuretés inévitables. En optimisant la conception en termes d'ingrédients, un acier pour pont Q370 à haute performance présentant d'excellentes propriétés mécaniques et de soudage est développé, ce qui raccourcit l'enchaînement des opérations et réduit également le coût des alliages.
PCT/CN2019/110795 2019-05-14 2019-10-12 Plaque d'acier pour pont haute performance de type tmcp avec une limite d'élasticité de 370 mpa et son procédé de fabrication WO2020228232A1 (fr)

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CN110106441A (zh) * 2019-05-14 2019-08-09 南京钢铁股份有限公司 TMCP型屈服370MPa高性能桥梁钢板及生产方法
CN112195406B (zh) * 2020-09-29 2021-11-19 南京钢铁股份有限公司 低成本高性能Q370qE-HPS桥梁钢及生产方法
CN113046652B (zh) * 2021-02-01 2022-03-01 南京钢铁股份有限公司 一种420MPa级耐候桥梁钢及其制造方法
CN113234999B (zh) * 2021-04-27 2022-05-20 南京钢铁股份有限公司 一种高效焊接桥梁钢及其制造方法
CN113637896A (zh) * 2021-07-12 2021-11-12 南京钢铁股份有限公司 低成本抗大线能量焊接420MPa级桥梁钢及生产方法
CN113862557A (zh) * 2021-08-20 2021-12-31 南京钢铁股份有限公司 一种铁素体珠光体型Q345qD桥梁钢特厚板及制造方法
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CN103352167A (zh) * 2013-07-15 2013-10-16 南京钢铁股份有限公司 一种低屈强比高强度桥梁用钢及其制造方法
CN104947000A (zh) * 2015-06-14 2015-09-30 秦皇岛首秦金属材料有限公司 屈服强度700MPa级高强钢及TMCP制造方法
WO2017169941A1 (fr) * 2016-03-31 2017-10-05 Ｊｆｅスチール株式会社 Tôle d'acier mince et tôle d'acier plaquée, procédé de production de tôle d'acier laminée à chaud, procédé de production de tôle d'acier entièrement durcie laminée à froid, procédé de production de tôle d'acier traitée thermiquement, procédé de production de tôle d'acier mince et procédé de production de tôle d'acier plaquée
CN106282789A (zh) * 2016-08-15 2017-01-04 山东钢铁股份有限公司 一种低碳特厚TMCP型Q420qE桥梁钢及其制造方法
CN108085604A (zh) * 2017-11-29 2018-05-29 南京钢铁股份有限公司 海洋工程用低温韧性s355g10+m宽厚钢板及其生产方法
CN108998726A (zh) * 2018-07-26 2018-12-14 南京钢铁股份有限公司 厚规格的420MPa级低屈强比低温桥梁钢及生产方法
CN110106441A (zh) * 2019-05-14 2019-08-09 南京钢铁股份有限公司 TMCP型屈服370MPa高性能桥梁钢板及生产方法

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