EP4035787B1 - Verfahren zum walzen von superaustenitischem rostfreiem stahl - Google Patents

Verfahren zum walzen von superaustenitischem rostfreiem stahl Download PDF

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Publication number
EP4035787B1
EP4035787B1 EP20866991.1A EP20866991A EP4035787B1 EP 4035787 B1 EP4035787 B1 EP 4035787B1 EP 20866991 A EP20866991 A EP 20866991A EP 4035787 B1 EP4035787 B1 EP 4035787B1
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Prior art keywords
rolling
stainless steel
billet
thickness
temperature
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English (en)
French (fr)
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EP4035787A1 (de
EP4035787A4 (de
EP4035787C0 (de
Inventor
Miao Zhang
Mingzhe ZHENG
Xudong Sun
Chao CHE
Long Huang
Wei Fan
Feixiang DENG
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack 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
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • 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
    • C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
    • 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
    • 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
    • C21D8/0242—Flattening; Dressing; Flexing
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/02—Austenitic rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/22—Pass schedule
    • 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
    • C21D2211/001—Austenite

Definitions

  • the present invention belongs to the technical field of steel rolling, and in particular, relates to a method for rolling super austenitic stainless steel.
  • NAS 254NM (equivalent to UNS N08367) is high corrosion resistant stainless steel containing high chromium and high molybdenum.
  • the specifications of this grade of steel still maintain good corrosion resistance even in the harsh environments of high temperature, seawater or flue gas and desulfurization equipment. It can be on a par with Hastelloy alloys and titanium plates under some environments, and it is highly economical stainless steel with high corrosion resistance.
  • N08367 contains 21% of Cr and 6% of Mo, so the deformation resistance thereof in a high temperature range is 2.5 to 3 times larger than that of ordinary grades of steel.
  • a rolling pressure is too large, and as the width increases, the load is further increased.
  • extremely thin specification rolling cannot be conducted, rolling interrupting or a poor plate shape occurs, and quality goods cannot be obtained.
  • CN 107 419 194 A discloses a rolling of a superaustenitic stainless steel.
  • the present invention provides a method for rolling super austenitic stainless steel. This method rolls super austenitic stainless steel with the specifications of a thickness of below 10 mm and a width of above 2500 mm.
  • a method for rolling super austenitic stainless steel including the following steps.
  • Deformation resistance of the super austenitic stainless steel at a high temperature is 2.5 to 3 times that of ordinary products.
  • Ultra-wide and thin specifications are developed in selection of billet types.
  • the minimum number of passes is adopted. It is necessary to ensure that in a case of meeting rolling thickness requirements, a minimum billet design principle is adopted, namely a minimum thickness billet loadable into a heating furnace.
  • the minimum thickness billet loadable into the heating furnace is determined according to a minimum billet thickness that can be measured by a laser detector in the heating furnace.
  • a minimum thickness is 115 mm.
  • a steel plate with the specifications of a thickness of 8.5 mm and a width of 2610 mm is rolled, a billet with a thickness of 115 mm, a width of 1780 mm and a length of 2610 mm is adopted.
  • cogging treatment is first conducted to a thickness of 115 mm, so as to reduce a total number of rolling passes in subsequent processes.
  • a final rolling temperature is required to be above 850°C, avoiding a sharp increase in deformation resistance below 850°C.
  • a reduction in the last two passes of rolling is less than 0.8 mm, avoiding that due to too large reduction, a roll gap for a rolling mill exceeds an equipment limit during actual rolling, resulting in difficult rolling. Meanwhile, it is ensured that a roll gap parameter for the rolling mill is set to be not less than 3.5 mm, avoiding that when the roll gap parameter for the rolling mill is set to be too small, a CVC rolling mill cannot move due to rolling force, resulting in that it cannot move in place.
  • a second-level model system optimizes a coefficient under different thicknesses according to the deformation resistance at different temperatures, and meanwhile, adjusts a certain specific pass separately. That is, in order to ensure the measurement accuracy of a thickness gauge, the thermal expansion coefficient of this stainless steel under different passes is adjusted separately according to the deformation resistance at different temperatures. Specifically, the coefficient is adjusted from 1.0132 ⁇ 10 -2 to 1.0133 ⁇ 10 -2 at 873°C, and the coefficient is adjusted from 1.02 84 ⁇ 10 -2 to 1.0285 ⁇ 10 -2 at 880°C, ensuring the accuracy of thickness self-learning correction by a second-level model.
  • a straightening process in a multi-pass straightening mode by a pre-straightening machine, a straightening pressure is increased by 1000 to 1500 tons according to plate shape conditions. If straightening force is too small, it will have no effect. If the straightening force is too large, it will exceed the equipment limit. During operation, pressing down 0.1 mm will increase about 100 tons of pressure, which corresponds to manually pressing down a roll gap by 1 to 1.5 mm.
  • Table 1 Rolling schedule table of N08367 with a thickness of 8.5 mm Rotating steel Outlet thickness mm Width mm Length mm Roll gap mm Reduction mm Reduction rate % Rolling force kN Torque Kn/m Biting speed m/s Rolling speed m/s Y 97.73 2656.39 1.91 91.29 17.87 15.46 76277 8691 1.50 1.50 N 80.70 2659.42 2.31 74.26 17.03 17.43 76263 8472 1.75 1.75 N 64.66 2662.27 2.88 58.17 16.04 19.88 76599 8253 1.75 1.75 N 49.82 2664.87 3.73 43.23 14.84 22.95 77495 8032 2.00 2.53 N 36.03 2667.19 5.16 28.35 13.79 27.68 86646 8680 2.
  • Rolling specifications and success rates are shown in Table 2: Table 2 Rolling pass rates of N08367 with a thickness of 8.5 mm Rolling specifications (thickness*width) mm*mm Total number of rolled blocks Number of successfully rolled blocks Pass rate 8.5*2510 17 17 100% 8.5*2610 70 66 94.3% Sum 87 83 95.4%
  • Performance index requirements of the grade of steel and specifications are shown in Table 3: Table 3 Performance index requirements of N08367 with a thickness of 8.5 mm 0.2% yield strength (N/mm 2 ) Tensile strength (N/mm 2 ) Elongation (%) Hardness (HRB) ⁇ 310 ⁇ 690 ⁇ 30 ⁇ 241
  • Table 4 Actual performance indexes of the grade of steel and specifications are shown in Table 4: Table 4 Actual performance indexes of N08367 with a thickness of 8.5 mm Performance index 0.2% yield strength (N/mm 2 ) Tensile strength (N/mm 2 ) Elongation (%) Hardness (HRB) Hot rolled plate 8.5 mm 439 762 45 211
  • the steel that meets the performance index requirements of the N08367 with the thickness of 8.5 mm can be rolled, and a higher success rate is achieved.
  • Performance index requirements of the grade of steel and specifications are shown in Table 6: Table 6 Performance index requirements of N08904 with a thickness of 10.0 mm 0.2% yield strength (N/mm 2 ) Tensile strength (N/mm 2 ) Elongation (%) Hardness (HRB) ⁇ 220 ⁇ 490 ⁇ 35 ⁇ 90
  • Table 7 Actual performance indexes of the grade of steel and specifications are shown in Table 7: Table 7 Actual performance indexes of N08904 with a thickness of 10.0 mm Performance index 0.2% yield strength (N/mm 2 ) Tensile strength (N/mm 2 ) Elongation (%) Hardness (HRB) 10.0 mm 245 598 48 80
  • the steel that meets the performance index requirements of the N08904 with the thickness of 10.0 mm can be rolled, and a higher success rate is also achieved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Steel (AREA)
  • Control Of Metal Rolling (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)

Claims (2)

  1. Ein Verfahren zum Walzen von superaustenitischem rostfreiem Stahl mit den Spezifikationen einer Dicke von unter 10 mm und einer Breite von über 2 500 mm, das die folgenden Schritte beinhaltet:
    (1) Auswählen eines Rohlings mit einer minimalen Dicke, der in einen Heizofen geladen werden kann, wobei die minimale Dicke 115 mm beträgt;
    (2) Durchführen von Stahlerhitzen des Rohlings bei 1 250 °C bis 1 270 °C und Steuern eines Temperaturunterschieds zwischen einer oberen und einer unteren Oberfläche auf 25 °C bis 35 °C;
    (3) kein Durchführen eines Entzunderungsvorgangs auf dem Rohling und Aufrechterhalten des Temperaturunterschieds zwischen der oberen und der unteren Oberfläche, sodass eine Temperatur der oberen Oberfläche höher ist als die der unteren Oberfläche;
    (4) Steuern einer Walzendtemperatur auf über 850 °C; Annehmen von 12 Walzstichen, wobei eine Reduzierung in den letzten beiden Walzstichen weniger als 0,8 mm beträgt; und Sicherstellen, dass ein Walzspaltparameter für ein Walzwerk auf nicht weniger als 3,5 mm eingestellt wird; während des Walzens, je nach dem Verformungswiderstand bei unterschiedlichen Temperaturen, Optimieren eines Wärmeausdehnungskoeffizient unter unterschiedlichen Dicken und separates Einstellen des Wärmeausdehnungskoeffizienten dieses rostfreien Stahls unter unterschiedlichen Walzstichen, wobei, wenn eine Temperatur unter 873 °C liegt, der Wärmeausdehnungskoeffizient des rostfreien Stahls auf 1,0133 × 10-2 eingestellt wird, und wenn die Temperatur höher als 873 °C ist und unter 880 °C liegt, der Wärmeausdehnungskoeffizient des rostfreien Stahls auf 1,0285 × 10-2 eingestellt wird; und
    (5) in einem Modus zum Richten in mehreren Durchgängen mit einer Vorrichtmaschine, um die Geradheit der endgültigen Blechform zu gewährleisten, wird der Walzspalt je nach den Bedingungen der Blechform manuell um 1 bis 1,5 mm nach unten gedrückt.
  2. Verfahren zum Walzen von superaustenitischem rostfreiem Stahl gemäß Anspruch 1, wobei für einen ursprünglichen Rohling, der eine Konstruktionsdicke von 115 mm übersteigt, eine Vorwalzbehandlung ("Cogging") durchgeführt wird, damit der ursprüngliche Rohling die Konstruktionsdicke für die Rohlingauswahl erreicht.
EP20866991.1A 2019-09-23 2020-06-19 Verfahren zum walzen von superaustenitischem rostfreiem stahl Active EP4035787B1 (de)

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CN201910902611.8A CN110773565B (zh) 2019-09-23 2019-09-23 一种轧制超级奥氏体不锈钢的方法
PCT/CN2020/096958 WO2021057117A1 (zh) 2019-09-23 2020-06-19 一种轧制超级奥氏体不锈钢的方法

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EP4035787A1 EP4035787A1 (de) 2022-08-03
EP4035787A4 EP4035787A4 (de) 2022-11-02
EP4035787C0 EP4035787C0 (de) 2025-01-22
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CN110773565B (zh) * 2019-09-23 2021-08-10 南京钢铁股份有限公司 一种轧制超级奥氏体不锈钢的方法
CN111389914B (zh) * 2020-03-02 2022-03-25 北京鼎新时代科技有限公司 一种超级奥氏体904l不锈钢板带的生产方法
CN111389913A (zh) * 2020-03-17 2020-07-10 江苏甬金金属科技有限公司 一种柔性产品用奥氏体不锈钢箔材的制作方法
CN112658030A (zh) * 2020-12-03 2021-04-16 南京钢铁股份有限公司 一种宽幅薄规格高镍钼奥氏体不锈钢板的轧制方法
CN113560344B (zh) * 2021-06-29 2022-12-16 鞍钢股份有限公司 一种奥氏体不锈钢的中厚板生产方法
CN114042773B (zh) * 2021-10-18 2023-06-23 山西太钢不锈钢股份有限公司 一种提升不锈钢特厚板组织均匀性的方法
CN115383408A (zh) * 2022-09-09 2022-11-25 甘肃酒钢集团宏兴钢铁股份有限公司 一种高锰无磁钢轧制工艺

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KR102702622B1 (ko) 2024-09-05
EP4035787A1 (de) 2022-08-03
CN110773565B (zh) 2021-08-10
CN110773565A (zh) 2020-02-11
KR20220061151A (ko) 2022-05-12
EP4035787A4 (de) 2022-11-02
WO2021057117A1 (zh) 2021-04-01
EP4035787C0 (de) 2025-01-22

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