WO2007079625A1 - Tole d'acier a grain ultrafin obtenue par coulee continue et laminage d'une brame semi fine, et son procede de fabrication - Google Patents

Tole d'acier a grain ultrafin obtenue par coulee continue et laminage d'une brame semi fine, et son procede de fabrication Download PDF

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Publication number
WO2007079625A1
WO2007079625A1 PCT/CN2006/001097 CN2006001097W WO2007079625A1 WO 2007079625 A1 WO2007079625 A1 WO 2007079625A1 CN 2006001097 W CN2006001097 W CN 2006001097W WO 2007079625 A1 WO2007079625 A1 WO 2007079625A1
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WO
WIPO (PCT)
Prior art keywords
rolling
steel
continuous casting
temperature
steel sheet
Prior art date
Application number
PCT/CN2006/001097
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English (en)
Chinese (zh)
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WO2007079625A8 (fr
Inventor
Jianlun Sun
Wanshan Zhang
Ju Guang
Xu Yang
Xin Chen
Qun Sun
Keqiang Wang
Liqun Liu
Yongbin Zhai
Guoli Fu
Jun Lu
Mingkai Yang
Original Assignee
Angang Steel Company Limited
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Publication date
Application filed by Angang Steel Company Limited filed Critical Angang Steel Company Limited
Publication of WO2007079625A1 publication Critical patent/WO2007079625A1/fr
Publication of WO2007079625A8 publication Critical patent/WO2007079625A8/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02—Rolling special iron alloys, e.g. stainless steel
    • 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
    • C21D8/04—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
    • 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
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • 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
    • 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
    • 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
    • C21D8/0215—Rapid solidification; Thin strip casting
    • 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
    • C21D8/041—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 involving a particular fabrication or treatment of ingot or slab
    • C21D8/0415—Rapid solidification; Thin strip casting

Definitions

  • Ultra-fine grain steel plate produced by medium and thin slab continuous casting and rolling and production method thereof
  • the invention belongs to the technical field of rolling steel, relates to a hot-rolled steel plate and a production method thereof, in particular to a hot-rolled steel plate with ultra-fine grain in a short-flow hot-rolled wide strip steel production line of medium and thin slab continuous casting and rolling. And its production methods.
  • Superfine grain processing is a cost-effective way to improve the physical and mechanical properties of steel materials. It can increase the strength of the material while reducing the ductile-brittle transition temperature of the material.
  • the grain of the steel material is remarkably refined by an effective process, and the performance is remarkably improved, so that the final product achieves ultra-thin weight reduction and long life, and has become an international steel material research.
  • One of the most concentrated hot spots Since the establishment of the "973" program in China, relevant research institutions and institutions in China and metallurgical enterprises have been conducting research in this area and have made significant progress.
  • the domestically formed hot-rolled steel sheet with ultra-fine grain is rolled on the continuous casting and rolling line of conventional (slab thickness greater than 230mm) based on the composition of Q235 type carbon steel.
  • Mature production technology It is well known that the production process of ultra-fine grain steel is characterized by low temperature and large deformation rolling (requiring a certain slab thickness) and rapid cooling after rolling. Generally, only ultra-fine grain steel plates with a thickness of 8 mm can be produced, in medium and thin slabs ( Thickness of 100 ⁇ 200mm) Continuous casting and rolling short-flow hot-rolled wide-band steel production line. Due to the thin slab thickness and small compression ratio, it is very difficult to produce ultra-fine grain steel (thickness of 2 ⁇ 18mm). Summary of the invention
  • the present invention has been made to solve the above problems, and an object thereof is to provide a continuous casting and rolling short-flow hot-rolled wide-bar steel production line for producing ultra-fine grain steel sheets, and achieving high strength, high plastic toughness, and reasonable yield. Excellent overall performance such as strong ratio.
  • Another object of the present invention is to produce a method of the product, which can significantly reduce energy consumption,
  • the chemical composition of the ordinary SS400 steel is adjusted and optimized, and the specific composition is weight: C : 0.12% to 0.18%, Si: 0.15% to 0.35%, ⁇ : 0 ⁇ 65% to 1.20%, P: ⁇ 0.02%, S: ⁇ 0.015%, and the balance is Fe and other impurities.
  • the microstructure of the steel sheet is mainly ferrite and pearlite, and the average grain size of the ferrite is 3 to 7 ⁇ m.
  • the rolling process of the present invention takes the following production process steps:
  • the temperature of the hot charging furnace is above 800 °C, and the heating temperature of the casting blank is controlled between 1100 ⁇ 1280 °C;
  • the laminar flow is cooled, the cooling rate is 10 ⁇ 45 ° C / s, and the temperature is controlled to be taken up between 400 and 620 ° C.
  • composition adjustment and optimization In order to reduce production costs, and at the same time improve the toughness of steel, to achieve the ultimate product ultra-thin weight loss and extended service life, the chemical composition of ordinary SS400 steel has been adjusted and optimized.
  • C plays an important role in ferritic-pearlite steel and is the most economical and most effective strengthening element. As the content of c increases, ferrite decreases, cementite increases, and cementite strengthens second phase. The strength of steel increases, but the ductility and toughness decrease. Taking into account the combined effects of strength and toughness, the adjustment C is 0.12 ⁇ 0.18%.
  • Si is soluble in ferrite and acts as a solid solution strengthening agent to increase the strength and hardness of steel, but the plasticity and toughness will decrease as the silicon content increases. At the same time, if Si exceeds 0.5%, red rust will be generated, which will deteriorate the surface shape, coating property and weldability of the steel sheet. To improve the strength and avoid the surface shape of the steel sheet, the silicon content is adjusted to 0.15% to 0.35%.
  • Mn can reduce the Ar 3 transformation point, expand the austenite phase region, and have a solid solution strengthening effect. At the same time, Mn can inhibit the generation of pearlite during the cooling process after hot rolling, but in order to save the alloy, the amount of manganese is adjusted to 0.65% to 1.20%.
  • FeS synthesized by S and Fe forms a low melting point eutectic with Fe. Its melting point is only 985 ° C and is distributed on the grain boundary. When the steel is rolled at 800 ⁇ 1200 ° C, the eutectic is melted. The relationship between the grains is weakened, the steel is cracked, and the heat is brittle. In order to avoid the hot brittleness and the formability and weldability of the steel sheet, the sulfur content in the steel is strictly controlled ⁇ 0.015%.
  • the medium-thin slab solidifies faster, and it is easy to obtain finer grains and smaller composition segregation, so that it can be further improved. Steps to refine the grains and reduce the segregation and looseness in the central region of the slab, so that the internal quality of the product is improved.
  • the dynamic soft reduction process is adopted on the continuous casting unit to improve the slab structure and facilitate the formation of the final ultrafine grains. Direct hot charging and 1100 ⁇ 1280 °C steel burning temperature, effectively saving energy and preventing the grain boundary and crystal enthalpy caused by excessive growth of austenite grains, so that the grain refining effect Weakened.
  • the high-pressure water is sprayed by the upper and lower double-row spray headers to remove the scale to improve the surface quality of the slab, and then rolled by a four-roll reversible roughing mill to reduce the slab to 30-60 mm.
  • the thickness of the billet before the finishing rolling should be reasonably set according to the thickness of the finished product, and the thickness of the intermediate billet should be increased as much as possible under the premise of the rolling capacity to ensure the finish rolling.
  • the shape variable helps to form a large amount of ultrafine ferrite grains. Controlling the temperature, deformation and deformation rate during rolling is very effective for refining the formed steel structure and reducing the deformation resistance.
  • the invention has the following advantages and effects: Through the adjustment and optimization of the chemical composition of the ordinary SS400 steel, and the tissue refinement control technology, the specification is produced in the short-flow hot-rolled wide-band steel production line of the medium-thin slab continuous casting and rolling process. It is a hot-rolled steel plate of 2 ⁇ 18mm.
  • the microstructure of this steel plate is mainly ferrite and pearlite.
  • the average grain size of ferrite is 3 ⁇ 7 ⁇
  • the yield strength is above 400MPa
  • the tensile strength is 510.
  • the chemical composition of this steel is very simple and easy to smelt.
  • the ultra-fine grain hot-rolled steel sheet rolled has excellent comprehensive properties such as high strength, high plastic toughness and reasonable yield ratio, and achieves ultra-thin weight loss and long service life of the final product.
  • the hot charging of the rolling process significantly reduces energy consumption, shortens production time and reduces production cost and time cost.
  • the steel does not contain special alloying elements, which can replace the low-alloy steel structure of the same grade, saving The alloy resources can significantly improve the economic and social benefits of the company.
  • Figure 2 is a photograph of the metallographic structure of a 6 mm thick hot-rolled steel sheet with ultrafine grain.
  • Figure 3 is a photograph of the metallographic structure of a 12 mm thick hot-rolled steel sheet with ultrafine grain.
  • Figure 4 is a photograph of the metallographic structure of a hot-rolled steel sheet having an ultrafine grain of 18 mm thick. detailed description
  • the present invention employs the following chemical components (% by weight): C: 0.12% to 0.18%, Si: 0.15% to 0.35%, Mn: 0.65% to 1.20%, P: ⁇ 0.02%, S: ⁇ 0.015%,
  • the amount of Fe and inevitable impurities, the microstructure of this steel plate is mainly ferrite and pearlite, the average crystal of ferrite
  • the particle size is 3 to 7 ⁇ m.
  • the chemical composition of the ultra-fine grain steel set in the above four ranges is used to smelt separately on the converter, and cast into a slab of the specification of 100 ⁇ 200mmx800 ⁇ 2000mm, which is directly hot-packed, and the temperature of the hot-packing furnace is above 800 °C.
  • the heating temperature is controlled between 1100 and 1280 ° C; after the billet is heated and discharged, the double-row high-pressure water descaling device is used for descaling; the rough rolling is performed on the two-roll or four-roll reversible roughing mill to thin the slab Up to 30 ⁇ 60mm; the inlet temperature of the finish rolling and rolling is controlled between 920 ⁇ 1050 °C, 7 times and large deformation strain accumulation are performed on the steel slab between the finishing stands, and the finishing mill F3 ⁇ F5 is applied 20% ⁇ 55% The amount of reduction, the average deformation rate of the steel strip between the finishing stands is between l ⁇ 10/s, and the water is cooled between the racks to ensure the finishing temperature is between 750 ⁇ 850 °C;
  • the cooling rate is 10 to 45 ° C / s, and the temperature is controlled to be taken up between 400 and 620 ° C.
  • Table 1 shows the chemical composition of steel
  • Table 2 shows the process parameters during the rolling process
  • Table 3 shows the corresponding mechanical properties and ferrite grain size.
  • the metallographic photos are shown in Figures 1-4.
  • Table 1 Chemical composition of the example steel (% by weight)
  • Rel is between 400 460 MPa
  • tensile strength (Rm) is between 510 580 MPa
  • elongation (A) is between 27% and 36%
  • ferrite grain size is between 3.0 and 7.0 ⁇ m.

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

Abstract

L'invention porte sur une tôle d'acier à grain ultrafin obtenue par coulée continue et laminage d'une brame semi fine, et sur son procédé de fabrication. La composition en poids de l'acier est la suivante: C 0.12-0.18%, Si 0.15-0.35%, Mn 0.65-1.20%, P≤0.02%, S≤0.015%, et le reliquat de Fe et d'impuretés. Le processus de fabrication comporte les étapes suivantes: chargement direct à chaud du lingot coulé à une température supérieure à 800°C, réchauffage jusqu'à 1100-1280°C; laminage de finition en plusieurs passes produisant d'importantes déformations accumulées, la température d'entrée étant de 920-1050°C et la température de sortie de750-850°C. Le coefficient moyen de déformation de la tôle dans les laminoirs de finition est de 1-10/s; le refroidissement laminaire de 10-45/s, la vitesse de bobinage de 400-620, l'épaisseur de la tôle de 2-18mm, la taille moyenne du grain de 3-7μm, la limite d'élasticité supérieure à 400 MPa, la résistance à la traction de 510-580 MPa, et l'élongation de plus de 26%.
PCT/CN2006/001097 2006-01-06 2006-05-25 Tole d'acier a grain ultrafin obtenue par coulee continue et laminage d'une brame semi fine, et son procede de fabrication WO2007079625A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200610045617.0 2006-01-06
CNB2006100456170A CN100503864C (zh) 2006-01-06 2006-01-06 一种中薄板坯连铸连轧生产超细晶粒钢板的方法

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WO2007079625A1 true WO2007079625A1 (fr) 2007-07-19
WO2007079625A8 WO2007079625A8 (fr) 2008-08-07

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TR (1) TR200804980T2 (fr)
WO (1) WO2007079625A1 (fr)

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