WO2007000108A1 - Plaques arriere molles a durete hr30t de 51 ? 3 pour l'etamage et procede de production de celles-ci - Google Patents

Plaques arriere molles a durete hr30t de 51 ? 3 pour l'etamage et procede de production de celles-ci Download PDF

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Publication number
WO2007000108A1
WO2007000108A1 PCT/CN2006/001459 CN2006001459W WO2007000108A1 WO 2007000108 A1 WO2007000108 A1 WO 2007000108A1 CN 2006001459 W CN2006001459 W CN 2006001459W WO 2007000108 A1 WO2007000108 A1 WO 2007000108A1
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Prior art keywords
controlled
rolling
temperature
soft
annealing
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PCT/CN2006/001459
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English (en)
Chinese (zh)
Inventor
Jun Li
Xiuzhen Lin
Liyang Zhang
Renzhong Jin
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Baoshan Iron & Steel Co., Ltd.
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Publication of WO2007000108A1 publication Critical patent/WO2007000108A1/fr

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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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0426—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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0436—Cold rolling
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium

Definitions

  • the invention relates to a soft tin plate and a manufacturing method thereof, in particular to a soft tin plate with a hardness HR30T within 51 ⁇ 3 and a manufacturing method thereof.
  • the soft tin plate is produced by continuous annealing of titanium-IF steel. It is mainly used for the production of expanded diameter basket barrels, deformed cans and stamped deformed cans. Background technique
  • T-1 to T-3 are soft tinplates
  • T-4 to T-6 are hard tinplates.
  • Japanese Steel Tube Co., Ltd. uses a low-carbon aluminum killed steel to produce a tin plate in Unexamined No. JP-A-873943, which was issued on March 19, 1996.
  • this method not only needs to be heated and then subjected to aging treatment after rapid cooling, but also has obvious aging properties, and the hardness of the product is relatively high, and the subsequent processing performance is also poor, in deep drawing, large expansion, severe bending, and the like. Under the condition of deformation, cracking, slip line or curved surface ridges are likely to occur.
  • the use of low carbon aluminum killed steel is not suitable for the production of very soft tinplate.
  • IF steel tin-plated products have shown strong market competitiveness.
  • a soft tin plate produced by adding yttrium (Nb) IF steel and a method for producing the same are disclosed in Japanese Laid-Open Patent Publication No. JP7197192, which is incorporated by reference.
  • the soft tinplate produced by this patent uses the following chemical composition: C: 0 ⁇ 004%, Mn: ⁇ 0.6%, A1: 0.03—0.10%, N ⁇ O.004%, Nb: 0.021 ⁇ 0.050%, and Nb
  • the atomic ratio with C is greater than 1.0.
  • This patent uses the IF steel, which has clear requirements for the content of Nb.
  • the product performance is unstable, and its recrystallization temperature is high, and the required annealing temperature is high.
  • the IF-IF steel is poor in plasticity, although its anisotropy is not large, its overall mechanical properties are worse than that of titanium-IF steel.
  • the patent discloses that the steel sheet is taken up between 600 ° C and 800 ° C, the upper limit of the coiling temperature is obviously too high to be practically operated, and the coiling temperature range protected by the patent is obviously unreasonable. Because the steel sheet is severely oxidized when coiled at approximately 800 ° C, it not only affects the pickling speed of the subsequent process, but also affects the surface quality of the final product.
  • the patent publication discloses annealing between 670 ° C and 800 ° C, since the patent uses ⁇ IF steel to produce a soft tin plate, it is close to 670 in the annealing temperature range given by the patent.
  • the present invention provides a method for producing a soft tinplate having a product hardness of HR30T stably controlled within 51 ⁇ 3, since the hardness range is between T-1CA and T-2CA, it can be called T-1.5CA. Summary of the invention
  • An object of the present invention is to provide a method for producing a soft tinplate by continuous annealing using a titanium-IF steel having a hardness of HR30T of 51 ⁇ 3.
  • the present invention provides a soft tin plate having a hardness of HR30T of 51 ⁇ 3, the composition of which is (by weight):
  • the balance is Fe and some unavoidable impurity elements.
  • the hardness HR30T of the soft tin plate in the present invention is in the range of 51 ⁇ 3 (the hardness of the soft tin plate will be referred to as T-L5CA soft tin plate below), for different product thicknesses. , produced using two different chemical compositions.
  • the chemical composition is expressed as a percentage by weight: (1) When producing a thin gauge tinplate product (thickness 0.25 mm), the chemical composition of the steel grade is: C (%) ⁇ 0.002 , Mn (%): 0.20-0.30, P (%) ⁇ 0.012, S(%) 0.015, Al(%): 0,03 ⁇ 0 ⁇ 06, N(%) ⁇ 0.003 , Si(%) ⁇ 0.03 , Ti(%): 0.03-0.045 , 0( %):
  • the C element is one of the strengthening elements.
  • the C content In order to ensure that the product performance meets the requirements, and the hardness HR30T is stably controlled below 54, the C content must be controlled below 0.005%. If the C content exceeds 0.005%, in order to ensure anti-aging properties, more Ti must be added, which will result in production costs. At the same time, the hardness of the product will rise and the molding performance will deteriorate, making it difficult to produce T-1.5CA soft tinplate. Due to the different thickness of the product, when the hardness is HR30T, the anvil effect of the base is different. When the thin gauge product is measured, the anvil effect of the base is large, and the measurement result is high.
  • C For products with a product thickness less than or equal to 0.25 mm, C The content is controlled at 0.002%, and for products with a product thickness greater than 0.25mm, the C content is controlled between 0.002% and 0.005%, and the actual hardness of the product is adjusted by the C content to offset the effect of the base anvil effect.
  • the final product hardness HR30T is stable within 51 ⁇ 3.
  • Mn is the main solid solution strengthening element of the present invention, which has a great influence on the mechanical properties of the final product.
  • the Mn element is less than 0.20%, the hardness of the product is easily lower than the lower limit of the hardness of T-1.5CA. Therefore, the present invention controls the Mn content to be between 0.20% and 0.30%.
  • Ti is a strong carbide forming element, mainly plays a role of fixing free carbon to form TiC.
  • Ti can significantly improve the anti-aging property of soft tinplate, especially its stamping formability, and TiC also has a certain dispersion strengthening effect.
  • the strength and hardness of the material can be improved, but the price of Ti is relatively expensive (although much cheaper than Nb), and the increase in the amount of Ti will increase the cost, so the content thereof should be strictly controlled, and the content of the invention is controlled to be less than 0.06%.
  • the present invention controls the Ti element content to be 0.03% or more.
  • the specific amount should be adjusted according to the C content in the steel. For the C content of 0.002%, the Ti content is controlled between 0.03 and 0.045%, and for the C content of 0.002 ⁇ 0.005 %, the Ti content is controlled at 0.04. ⁇ Q.06%.
  • A1 is a sedative element and is also a strong nitride forming element. It is used to fix N atoms, which is beneficial to improve the anti-aging property of the material. In addition, it has an influence on corrosion resistance and mechanical properties.
  • the present invention strictly controls the A1 content to 0.03 %. Between ⁇ 0.06%. When the A1 content is less than 0.03%, the purpose of fixing the N atom is not achieved, and the aging resistance of the material is deteriorated. When the A1 content is more than 0.06%, the cost is increased, and the growth of recrystallized grains during annealing is suppressed. Control the A1 content to 0.06 %the following.
  • the present invention requires that the content be controlled to be less than 0.03 %, and when the content exceeds 0.03 %, the corrosion resistance is remarkably deteriorated.
  • ⁇ ( 0 ⁇ 0.004% ) is a harmful impurity element, which should be strictly controlled. The lower the better, otherwise it will affect the mechanical properties and corrosion resistance of soft tinplate.
  • the amount of ⁇ reflects the inclusion content of the material, due to T- 1.5CA soft tinplate is mostly used for the production of cans such as stamping and forming squid pots. Therefore, it is necessary to strictly control the content of 0 to control the oxide inclusions and ensure that the thin material does not crack after stamping.
  • the T-1.5CA soft tinplate of the invention is produced by the following steps: steelmaking, continuous casting, hot rolling
  • Hot rolling The hot rolling temperature is controlled between 1 190 ° C and 1250 ° C.
  • the preferred hot rolling temperature is controlled between 1200 ° C and 1240 ° C.
  • the hot rolling finishing temperature is controlled at 880 ° 920 ° C. between. Both theoretical and production practices have proved that the finish rolling temperature is greater than 920 ° C, the surface of the strip is heavily oxidized, and the surface quality of the product is poor. However, when the finishing temperature is lower than 880 , the hot rolled strip will appear mixed crystal structure and eventually lead to Uneven product performance.
  • the invention uses the T-1.5CA soft tin plate produced by continuous annealing, and the hot rolling finish rolling temperature is controlled between 880 and 920 ° C, so that the surface of the steel strip is lightly oxidized, so that the subsequent pickling efficiency is improved, and the surface of the product is improved. The quality is also improved, and the mixed crystal structure does not appear in the strip, and the final product has uniform tissue properties.
  • the preferred hot rolling finishing temperature range is controlled between 885 and 915 °C.
  • the hot rolling coiling temperature is controlled between 560 ° C and 620 ° C. Increasing the coiling temperature can reduce the hardness of the final product and improve the forming properties of the final product.
  • the coiling temperature is higher than 620 °C, the surface of the strip will be thickened, the pickling becomes difficult, and the surface quality of the product is affected. .
  • the coiling temperature is less than 560 ° C, the grain of the hot rolled intermediate product is too small, and the finished structure is affected, so that the final product has fine crystal grains, increased hardness, and poor plasticity.
  • the hot rolling coiling temperature is controlled at 560 ° C to 620 ° C, the hardness of the final product can be controlled within 51 ⁇ 3, The amount of iron oxide on the surface of the strip is less, the pickling is easier, the pickling production efficiency is high, and the surface quality of the final product is good.
  • the preferred hot rolling coiling temperature is controlled between 570 ° C and 610 ° C.
  • Pickling and cold rolling It can be produced by acid rolling combined unit, or pickled first, followed by cold rolling or multiple reversible cold rolling, but it is best to use acid rolling combined unit to improve production efficiency.
  • the speed of the unit should be adjusted according to the pickling ability of the unit to ensure the pickling effect.
  • cold rolling is carried out for five-frame continuous rolling, the total reduction ratio of cold rolling is 82% to 92%. Cold rolling deformation will affect the mechanical properties of the material
  • the cold rolling deformation of different specifications of T-1.5CA soft tinplate produced by continuous annealing according to the present invention appropriately increases the cold rolling deformation in the rolling schedule of ordinary low carbon aluminum killed steel tinplate, and appropriately improves cold rolling
  • the rolling force of each frame in the process ensures stable rolling of IF steel. .
  • the present invention uses a T-1.5CA soft tin plate produced by continuous annealing, and the annealing temperature is controlled between 730 ° C and 760 ° C, and the holding time is controlled between 25 s and 50 s.
  • the soft tinplate can be produced by hood annealing, the tin-plated products produced by the hood annealing process are not uniform in mechanical properties, and the shape and surface quality of the products are far less than the soft tinplates produced by continuous annealing.
  • the invention adopts titanium-IF steel continuous annealing to produce T-1.5CA soft tinplate, and the product has uniform mechanical properties, good product surface quality, can better meet user requirements, and thus has strong market competitiveness.
  • the present invention controls the annealing temperature below 760 °C.
  • the annealing temperature is controlled above 730 ° C in this patent.
  • the annealing temperature is controlled between 735 ° C and 755 ° C. The holding time and the annealing temperature are mutually influential.
  • Increasing the annealing temperature facilitates shortening the holding time, but the holding time cannot be less than 25 s. Otherwise, the recrystallized grain growth is insufficient, the material is hard, the plasticity is decreased, and the unit production speed is too fast. Steel is easy to run off. Holding time can not Too long, when the holding time exceeds 50s, the speed of the unit is too low, on the one hand, the production efficiency is reduced, on the other hand, the grain length is too large, the material is soft and the strip is easily bent or even broken in the annealing furnace. .
  • the invention uses the T-1.5CA soft tin plate produced by continuous annealing of titanium-IF steel, which is more than the use of the first IF steel (the annealing temperature is usually above 750 °C to ensure sufficient recrystallization).
  • the continuous annealing produces soft tin plating.
  • the annealing temperature of the plate is low, so the amount of transition rolls and the time of rising and cooling can be reduced during the production planning, the production efficiency is increased, the production cost is lowered, and the temperature is reduced, the strip is greatly reduced in the annealing furnace. The chance of a buckling and a broken band.
  • the double-stand is flattened, and the flattening elongation is controlled within 1.2% ⁇ 2.2%.
  • the flattening elongation is less than 1.2%, the surface roughness and shape of the surface of the product are particularly difficult to control, and the material is soft.
  • the flat elongation is more than 2.2%, the hardness will be significantly improved, and the molding properties of the material and The weldability (weld quality) will deteriorate and the leveling roll consumption will increase.
  • the preferred flat elongation is controlled to be within 1.4% to 2.0%.
  • Tin plating uses a T-1.5CA soft tin plate produced by continuous annealing, which can be produced by the same tin plating process as a common tin plate.
  • the annealing temperature of Ti-IF steel is lower than that of Nb-IF steel, the production process is safer, the heat energy consumption is low, the amount of transition material is small, and Ti is cheaper than Nb, so the production cost of the soft tinplate of the invention is low.
  • T-1.5 soft tinplate The following is an example of the production of a T-1.5 soft tinplate according to the present invention.
  • Example 1-6 A thicker (>0.25 mm) T-1.5 soft tin plate was produced using Ti-I steel.
  • the molten steel is vacuum degassed by RH refining, and various measures for controlling inclusions are adopted.
  • the continuous casting slab is produced by the conventional continuous casting process.
  • the chemical composition of the molten steel is shown in Table 2, and the steel also contains other unavoidable impurities. Element, the balance is Fe.
  • Table 2 The chemical composition of the substrate of Example 1-6, Wt%
  • the continuous casting billet is heated to the hot rolling billet temperature before hot rolling, and is coiled after rough rolling, finish rolling and laminar cooling, and cooled by room temperature after 2 to 3 days at room temperature (cickling and cold rolling combined unit) Production of cold rolled sheets.
  • the specific process parameters are shown in Table 3:
  • the cold-rolled strip is annealed and leveled in a CAPL unit (continuous annealing and flattening unit), and then conventional tin plating is used to produce a tin plate.
  • the annealing process parameters and the hardness of the tin plate are shown in Table 4. Table 4 Example 1 to 6 annealing process parameters performance
  • the mechanical properties of the final product are basically the same before and after aging, and the mechanical properties after aging are shown in Table 5.
  • Example 7-12 Titanium-IF steel was used to produce a thin gauge tin plate with a thickness of 0.25 mm or less.
  • the molten steel is vacuum degassed by RH refining, and various measures for controlling inclusions are adopted.
  • the continuous casting slab is produced by the conventional continuous casting process.
  • the chemical composition of the molten steel is shown in Table 6, and the steel also contains other unavoidable impurities. Element, the balance is Fe. + Table 6
  • the continuous casting billet is heated to the hot rolling billet temperature before hot rolling, and is coiled after rough rolling, finish rolling and laminar cooling, and cooled by room temperature after 2 to 3 days at room temperature (cickling and cold rolling combined unit) Production of cold rolled sheets.
  • the specific process parameters are shown in Table 7:
  • the cold-rolled strip was annealed and leveled in a CAPL unit (continuous annealing and flattening unit), and then conventional tin plating was used to produce a tin-plated sheet.
  • the annealing process parameters are shown in Table 8. Table 8 Example 7-12 annealing process parameters
  • the mechanical properties of the final product are basically the same before and after aging, and the mechanical properties after aging are as shown in Table 9 in Table 9 and the mechanical properties and surface quality of Examples 7-12.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)

Abstract

L'invention concerne des plaques arrière molles à dureté HR30T de 51 ? 3 pour l'étamage comprenant, en pourcentage en poids, jusqu'à 0,005 % de C, entre 0,20 et 0,30 % de Mn, entre 0,03 et 0,06 % d'Al, jusqu'à 0,03 % de Si, entre 0,03 et 0,06 % de Ti, jusqu'à 0,012 % de P, jusqu'à 0,015 % de S, jusqu'à 0,003 % de N, et jusqu'à 0,004 % d'O, le reste se composant de Fe et des autres impuretés inévitables. Le procédé de production de ces plaques arrière molles consiste à réaliser un aciérage, une coulée continue, un laminage à chaud, une combinaison d'un décapage et d'un laminage en tandem à froid, un recuit continu et un écrouissage à froid. Les principaux paramètres de traitement dans ce procédé sont les suivants: une température de distribution de brame comprise entre 1190 et 1250 °C, une température de laminage finale comprise entre 880 et 920 °C, une température de cintrage comprise entre 560 et 620 °C, une température de recuit comprise entre 730 et 760 °C, un temps de maintien compris entre 25 et 50 secondes, et un allongement au revenu de 1,2 à 2,2 %.
PCT/CN2006/001459 2005-06-29 2006-06-26 Plaques arriere molles a durete hr30t de 51 ? 3 pour l'etamage et procede de production de celles-ci WO2007000108A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNB200510027290XA CN100473740C (zh) 2005-06-29 2005-06-29 硬度hr30t在51±3内的软质镀锡板及其制造方法
CN200510027290.X 2005-06-29

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WO2007000108A1 true WO2007000108A1 (fr) 2007-01-04

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KR (1) KR20080038142A (fr)
CN (1) CN100473740C (fr)
RU (1) RU2382111C2 (fr)
WO (1) WO2007000108A1 (fr)

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CN111893380B (zh) * 2020-07-13 2021-12-21 首钢集团有限公司 一种易撕盖用冷轧镀锡板及其制备方法
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