WO2024130968A1 - Tige de fil et tige ronde laminées à chaud sans revêtement de qualité 400 mpa, et processus de laminage associé - Google Patents

Tige de fil et tige ronde laminées à chaud sans revêtement de qualité 400 mpa, et processus de laminage associé Download PDF

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Publication number
WO2024130968A1
WO2024130968A1 PCT/CN2023/097478 CN2023097478W WO2024130968A1 WO 2024130968 A1 WO2024130968 A1 WO 2024130968A1 CN 2023097478 W CN2023097478 W CN 2023097478W WO 2024130968 A1 WO2024130968 A1 WO 2024130968A1
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WIPO (PCT)
Prior art keywords
heating
temperature
rolling
wire rod
long product
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PCT/CN2023/097478
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English (en)
Chinese (zh)
Inventor
张帆
夏艳花
任安超
王彦林
贾万军
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武汉钢铁有限公司
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Publication of WO2024130968A1 publication Critical patent/WO2024130968A1/fr

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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
    • B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • 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
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper

Definitions

  • the invention belongs to the technical field of metallurgy, and in particular relates to a 400MPa-grade coating-free hot-rolled wire rod, a round bar and a rolling process thereof.
  • CN115110006A discloses a weathering steel with high corrosion resistance and a preparation method, a weathering steel, the chemical composition and its mass percentage are: C: 0.05-0.12%, Si: 0.20-0.60%, Mn: 0.30-0.60%, P: 0.07-0.15%, S: ⁇ 0.015%, Cu: 0.25-0.55%, Ni: ⁇ 0.20%, Cr: 0.30-0.60%, the balance is Fe and inevitable impurities, and the relative corrosion rate of atmospheric corrosion resistance is less than 40% of Q345B.
  • the invention adds certain weathering elements such as P, Cu, Cr to the steel, but its relative corrosion rate is only less than 40%, which cannot meet the requirements of free coating, and the addition of P will inevitably deteriorate the cold working performance of the steel, which is not conducive to the deep processing of wire rods and round bars.
  • CN114959483A discloses a weathering steel resistant to a hot, humid and high-salinity marine atmosphere and a production method thereof, wherein the components of the weathering steel are calculated by mass percentage as follows: C: 0.02% to 0.06%, Si: 0.17% to 0.37%, Mn: 0.8% to 1.2%, P: ⁇ 0.012%, S: ⁇ 0.005%, Cu: 0.8% to 1.2%, Cr: 0.2% to 0.4%, Ni: 1.5% to 2%, Mo: 0.1% to 0.25%, Ti: 0.01% to 0.03%, Sn: 0.05% to 0.2%, and the rest is Fe and unavoidable inclusions.
  • the invention ensures that the steel plate has both excellent economy and corrosion resistance by adding a large amount of precious metal Ni and combining certain weathering elements, but the invention is relatively costly and is not suitable for cold processing of wire rods and round bars, and is only a conventional weathering plate.
  • Wire rods and round bars often have to go through multiple deep processing steps (such as cold drawing, stranding, rolling, etc.), and their application scenarios are quite different from those of plates.
  • coating-free weathering steel in plates is relatively mature, but there are no related reports in the field of wire rods and round bars.
  • According to the application scenario requirements of wire rods and round bars from the perspective of chemical composition and rolling process, how to design a 400MPa-grade coating-free hot-rolled wire rod, round bar and its rolling process to meet the needs of multiple industries to upgrade galvanized materials to coating-free weathering materials has become a technical problem that needs to be solved urgently.
  • the purpose of the present invention is to provide a 400MPa grade coating-free weather-resistant hot-rolled wire rod, round bar and its rolling process, which has excellent toughness, cold heading and weather resistance (relative corrosion rate ⁇ 25%), can meet the requirements of deep drawing and cold heading processing, and can meet the requirements of coating-free and bare use for more than 25 years.
  • a 400MPa grade coating-free hot-rolled wire rod and round bar the chemical composition of which is calculated by mass percentage as follows:
  • wire rods and round bars are long products.
  • long products refer to wire rods, bars, and profiles.
  • the long products of the present invention are mainly hot-rolled wire rods and hot-rolled round bars.
  • the rolling process of the above-mentioned 400MPa-grade coating-free hot-rolled wire rod and round bar comprises the following steps:
  • Billet heating including preheating section, heating section and soaking section;
  • Controlled cooling The wire rod adopts the Stelmor process for controlled cooling; the round bar adopts the upper cooling bed for insulation and slow cooling.
  • the billet in the billet heating step, is a small square billet or a rectangular billet with a cross-section of (140-220mm) ⁇ (140-220mm); the heating temperature of the preheating section is ⁇ 600°C, and the heating time is 15min-20min; the heating section is divided into heating section 1 and heating section 2, the heating temperature of heating section 1 is 600°C-1000°C, and the heating time is 10min-15min, the heating temperature of heating section 2 is 1000°C-1200°C, and the heating time is 20min-30min; the heating temperature of the soaking section is 1150°C-1200°C, and the heating time is 20min-30min.
  • the finishing rolling temperature is 830 ⁇ 10°C
  • the sizing temperature is 840 ⁇ 10°C
  • the final rolling temperature is 850 ⁇ 10°C, which are the main temperature parameters of low-temperature controlled rolling.
  • the cooling control step 9 rollers and 13 fans are used for cooling control.
  • the wire rod is cooled by the Stelmor process.
  • the speed of the 0# roller is 0.2-1m/s, and the speed of the remaining 8 rollers is increased by 3%-5% (extremely
  • the air volume of 13 sets of fans is 210000m3 /h, 1# ⁇ 2# fans are opened by 5% ⁇ 25%, and the insulation cover is opened to ensure that the outlet temperature of 2# fan is 700 ⁇ 20°C, 3# ⁇ 13# fans are all closed, and the insulation cover is closed to ensure that the outlet temperature of 13# fan is greater than 350°C.
  • the temperature of the round bar on the cooling bed is greater than 850°C, and a heat preservation cover is used for slow cooling, and the temperature out of the heat preservation cover is greater than 600°C.
  • Carbon has the most significant effect on the strength and plasticity of the wire rod. With the increase of carbon content, the strength of the wire rod continues to increase and the plasticity decreases sharply. The carbon content also affects the drawability of the final product. Taking all factors into consideration, the carbon content of the present invention is 0.02-0.10wt%.
  • Si Silicon is beneficial to corrosion resistance and can significantly improve the elastic limit of the drawn steel wire, but too high Si content will increase the brittleness of ferrite and is not conducive to cold heading. Taking all factors into consideration, the silicon content of the present invention is less than 0.25wt%.
  • Mn Manganese combines with sulfur to form MnS, thereby reducing the harm of sulfur, and can refine pearlite and improve the strength of steel wire; however, Mn is easy to segregate in steel, thereby causing uneven structure and performance, and too high Mn content will also increase production costs.
  • the manganese content of the present invention is less than 0.4wt%.
  • Phosphorus is one of the most effective alloying elements for improving the atmospheric corrosion resistance of steel. Phosphorus can be evenly dissolved in steel, which helps to form a dense protective film on the steel surface, so that the inside is not corroded by the atmosphere. Usually, when w(P) in steel is 0.08% to 0.15%, the corrosion resistance is the best; but for industrial wires that require deep cold processing, phosphorus is easy to produce cold brittleness, which has a great impact on the quality of steel, especially the cold processing performance, so it needs to be strictly controlled. Taking all factors into consideration, the phosphorus content P of the present invention is less than 0.03wt%.
  • S Sulfur is a harmful element in this steel. Sulfur is easy to cause hot brittleness, which in turn deteriorates the wire drawing and heat treatment processing conditions. If the mass fraction of residual sulfur in the steel is reduced to 0.01%, the weather resistance of carbon steel can be greatly improved. Taking all factors into consideration, the sulfur content S of the present invention is less than 0.02wt%.
  • Cu Copper is a commonly used alloying element in the production of corrosion-resistant steel materials. Cu is a metal element with a slow chemical reaction rate. By adding Cu, the strength of steel can be improved, but if the Cu content is too high, it will directly affect the low-temperature toughness of the steel. It is worth noting that copper has a significant effect in offsetting the harmful effects of sulfur in steel. Its action characteristic is that the higher the sulfur content in the steel, the more significant the relative effect of copper in reducing the corrosion rate. This is because copper and sulfur generate insoluble sulfides. Taking all factors into consideration, the copper content of the present invention is 0.1-1.0wt%.
  • Chromium is the main element that improves the weather resistance of steel. Chromium can form a dense oxide film on the surface of steel, improve the passivation ability of steel, and slow down the growth rate of rust layer. However, chromium will greatly improve the hardenability of steel. Excessive chromium will cause abnormal structures such as bainite and martensite to form in steel, which is not conducive to the cold working performance of steel. Taking all factors into consideration, the chromium content of the present invention is 1.0-4.5wt%.
  • Nb, V Niobium and vanadium are common microalloy strengthening elements, which can prevent the growth of austenite grains, refine the reheated austenite grains, and improve the uniformity of organization and performance, but excessive addition will significantly increase production costs, and the composite microalloying strengthening effect of Nb and V is better than that of a single element.
  • the 400MPa-grade coating-free hot-rolled wire rod and round bar of the present invention have a high alloy content.
  • the heating temperature and time of each area of the heating furnace are limited to ensure that the alloy is fully diffused and uniformed during the heating process without causing coarse grains due to high temperature.
  • low-temperature rolling is adopted to obtain fine grains during the rolling process, and slow cooling is combined to avoid the formation of abnormal bainite and martensite abnormal structures, so that the hot-rolled wire rod and round bar products have good cold processing performance.
  • the present invention has the following beneficial effects:
  • the present invention provides a 400MPa-grade hot-rolled wire rod and round bar without coating or plating and a rolling process thereof, which meet the requirements of downstream users for direct bare use without coating or plating and maintenance-free throughout the entire life cycle, thereby greatly reducing the production investment cost; in addition, the present invention has excellent steel strength and toughness through reasonable component design and coordination with the steel rolling process, which can meet various cold processing requirements of hot-rolled wire rods and round bars, thereby greatly expanding the application scenarios of weathering steel.
  • the production process of each embodiment of the present invention is as follows: molten iron pretreatment ⁇ converter/electric furnace smelting (decarbonization, dephosphorization, etc.) ⁇ argon station (deoxidation, alloying, etc.) ⁇ refining (composition adjustment and removal of inclusions, gases, etc.) ⁇ vacuum treatment (precise control of composition and temperature) ⁇ continuous casting ⁇ heating ⁇ rolling into products ⁇ controlled rolling cooling.
  • the detailed production process including smelting process (i.e., steps (1)-(5)) and rolling process (i.e., steps (6)-(8)) is as follows:
  • the molten steel is vacuum treated, the molten steel is circulated ⁇ 4 times, and the composition is fine-tuned;
  • Heating the steel billet including preheating section, heating section and soaking section;
  • the steel billet is a small square billet or a rectangular billet with a cross section of (140-220 mm) ⁇ (140-220 mm); the preheating temperature is ⁇ 600°C and the heating time is 15 min to 20 min; the heating section is divided into heating section 1 and heating section 2, and heating section 1 is used for heating the steel billet.
  • the heating temperature of the first heating section is 600°C ⁇ 1000°C, and the heating time is 10min ⁇ 15min.
  • the heating temperature of the second heating section is 1000°C ⁇ 1200°C, and the heating time is 20min ⁇ 30min.
  • the heating temperature of the soaking section is 1150°C ⁇ 1200°C, and the heating time is 20min ⁇ 30min.
  • Table 2 The specific process parameters are shown in Table 2.
  • the finishing rolling temperature is 830 ⁇ 10°C
  • the sizing temperature is 840 ⁇ 10°C
  • the final rolling temperature is 850 ⁇ 10°C; the specific process parameters are shown in Table 3;
  • Controlled cooling process The wire rod is cooled by the Stelmor process, and 9 rollers and 13 fans are used for controlled cooling.
  • the speed of the 0# roller is 0.2-1 m/s, and the speed of the remaining 8 rollers is increased by 3%-5% (extreme difference) compared with the previous roller.
  • the air volume of the 13 fans is 210000m3 /h, 1#-2# fans are opened by 5%-25%, and the insulation cover is opened to ensure that the outlet temperature of the 2# fan is 700 ⁇ 20°C, and the 3#-13# fans are all closed and the insulation cover is closed to ensure that the outlet temperature of the 13# fan is greater than 350°C.
  • the specific process parameters are shown in Table 4.
  • the round bar is slowly cooled by the upper cooling bed with the upper cooling bed temperature>850°C, and slowly cooled by the insulation cover with the temperature out of the insulation cover>600°C; the specific process parameters are shown in Table 4.
  • the production process of the comparative example is equivalent to that of the embodiment, and the main differences are the chemical composition, heating process parameters, rolling process parameters, and cooling control process parameters.
  • the chemical composition of each embodiment and comparative example of the present invention is shown in Table 1; the heating process parameters of each embodiment and comparative example are shown in Table 2; the rolling process parameters of each embodiment and comparative example are shown in Table 3; the cooling control process parameters of each embodiment and comparative example are shown in Table 4.
  • the test results (toughness, cold heading performance, weather resistance) of each embodiment and comparative example are shown in Table 5.
  • the comparative example contains certain weather-resistant elements (Cr, Cu), but the ratio and content of the relevant elements are significantly different from those of the embodiment. Under the same process flow and different process control, even at lower C and weather-resistant element contents, the toughness and weather resistance of the final wire rod and round bar products of the embodiment are significantly better than those of the comparative example, demonstrating the advancement and creativity of the present invention.
  • the comparative steel types can meet the 400MPa grade requirements, cracks appear in cold heading and the relative corrosion rate is ⁇ 60%, which cannot meet the requirements of deep processing and free coating and plating of hot-rolled wire rods and round bars; while the 400MPa-grade free coating and plating hot-rolled wire rods, round bars and their rolling process developed by the present invention have excellent strength and toughness, with a strength of 400MPa and a surface reduction rate of ⁇ 70%, a relative corrosion rate of ⁇ 25%, excellent cold workability and can meet the user's requirements for free coating and plating and direct bare use.

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

Abstract

Sont divulguées dans la présente invention une tige de fil et une tige ronde laminées à chaud sans revêtement de qualité 400 MPa, qui comprennent les composants chimiques suivants en pourcentages en masse : 0,02 à 0,10 % en poids de C, < 0,25 % en poids de Si, 0,4 % en poids de Mn, 0,03 % en poids de P, 0,02 % en poids de S, 0,1 à 1,0 % en poids de Cu, 1,0 à 4,5 % en poids de Cr, avec Cr/Cu ＝ 5 à 11, le complément étant du Fe et des impuretés inévitables. La tige de fil et la tige ronde peuvent également subir le processus de micro-alliage, et comprennent en outre les composants chimiques suivants en pourcentages en masse : 0,015 à 0,035 % en poids de Nb, 0,04 à 0,07 % en poids de V, et Nb/V = 1/3 à 2/3. La tige de fil et la tige ronde laminées à chaud sans revêtement de qualité 400 MPa et un processus de laminage associé selon la présente invention satisfont les exigences d'utilisation à nu direct sans revêtement et les exigences sans entretien de l'ensemble du cycle de vie d'utilisateurs en aval, réduisant ainsi considérablement le coût de production et d'investissement. De plus, au moyen d'une conception de composant rationnelle et d'une adaptation avec un processus de laminage d'acier dans la présente invention, l'acier présente une bonne résistance et une bonne ténacité, peut satisfaire diverses exigences d'usinage à froid d'une tige de fil et d'une tige ronde laminées à chaud, et les scénarios d'utilisation d'un acier patinable sont considérablement étendus.
PCT/CN2023/097478 2022-12-22 2023-05-31 Tige de fil et tige ronde laminées à chaud sans revêtement de qualité 400 mpa, et processus de laminage associé WO2024130968A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202211658126.9A CN115927968B (zh) 2022-12-22 2022-12-22 一种400MPa级免涂镀热轧盘条、圆棒及其轧制工艺
CN202211658126.9 2022-12-22

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CN115927968B (zh) * 2022-12-22 2024-05-14 武汉钢铁有限公司 一种400MPa级免涂镀热轧盘条、圆棒及其轧制工艺

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000256741A (ja) * 1999-03-09 2000-09-19 Sumitomo Metal Ind Ltd 熱間圧延棒鋼または線材の製造方法
JP2009263725A (ja) * 2008-04-25 2009-11-12 Nippon Steel Corp 高温強度に優れる溶接構造用鋼の製造方法
CN113025917A (zh) * 2021-02-03 2021-06-25 江阴兴澄合金材料有限公司 一种具有低强度高塑性免退火冷镦钢用盘条及其制造方法
WO2022151603A1 (fr) * 2021-01-15 2022-07-21 江苏省沙钢钢铁研究院有限公司 Barre d'acier résistante à la corrosion de qualité 400 mpa et son procédé de production
CN115927968A (zh) * 2022-12-22 2023-04-07 武汉钢铁有限公司 一种400MPa级免涂镀热轧盘条、圆棒及其轧制工艺

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001075186A1 (fr) * 2000-04-04 2001-10-11 Nippon Steel Corporation Barre a fil ou barre d'acier laminee a chaud pour utilisation dans des structures de machine pouvant se dispenser de recuit, et procede de fabrication associe
KR101289154B1 (ko) * 2009-12-29 2013-07-23 주식회사 포스코 내식성 및 충격인성이 우수한 열연강판 및 그 제조방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000256741A (ja) * 1999-03-09 2000-09-19 Sumitomo Metal Ind Ltd 熱間圧延棒鋼または線材の製造方法
JP2009263725A (ja) * 2008-04-25 2009-11-12 Nippon Steel Corp 高温強度に優れる溶接構造用鋼の製造方法
WO2022151603A1 (fr) * 2021-01-15 2022-07-21 江苏省沙钢钢铁研究院有限公司 Barre d'acier résistante à la corrosion de qualité 400 mpa et son procédé de production
CN113025917A (zh) * 2021-02-03 2021-06-25 江阴兴澄合金材料有限公司 一种具有低强度高塑性免退火冷镦钢用盘条及其制造方法
CN115927968A (zh) * 2022-12-22 2023-04-07 武汉钢铁有限公司 一种400MPa级免涂镀热轧盘条、圆棒及其轧制工艺

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