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WO2022067962A1 - Low-cost high-performance q370qe-hps bridge steel and production method - Google Patents

Low-cost high-performance q370qe-hps bridge steel and production method Download PDF

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WO2022067962A1
WO2022067962A1 PCT/CN2020/126500 CN2020126500W WO2022067962A1 WO 2022067962 A1 WO2022067962 A1 WO 2022067962A1 CN 2020126500 W CN2020126500 W CN 2020126500W WO 2022067962 A1 WO2022067962 A1 WO 2022067962A1
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residual
performance
q370qe
hps
low
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PCT/CN2020/126500
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French (fr)
Chinese (zh)
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祝瑞荣
翟冬雨
洪君
丁叶
李翔
高燕
张媛钰
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南京钢铁股份有限公司
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Priority to KR1020237010905A priority Critical patent/KR20230059826A/en
Priority to JP2023519218A priority patent/JP7577202B2/en
Publication of WO2022067962A1 publication Critical patent/WO2022067962A1/en

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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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
    • B21C51/005—Marking devices
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with 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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • 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
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors
    • C21C2005/4626—Means for cooling, e.g. by gases, fluids or liquids
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to the technical field of iron and steel production, in particular to a low-cost high-performance Q370qE-HPS bridge steel and a production method.
  • High-performance bridge steel plate Q370qE-HPS is widely used in highway bridges, railway bridges, and highway-railway bridges. Since 2010, under the background of the country's vigorous development of transportation construction and the continuous increase of bridge steel
  • the normalized steel plate mainly used in steel the smelting process cost of the normalizing heat treatment process is more than 200 yuan, not including the cost of transportation. Or quality problems such as penetration fillet weld laminar tearing.
  • the present invention provides a low-cost high-performance Q370qE-HPS bridge steel, whose chemical composition and mass percentage are as follows: C: 0.05%-0.08%, Si: 0.10%-0.40%, Mn: 1.61%- 1.70%, P ⁇ 0.015%, S ⁇ 0.0030%, Nb: 0.030% ⁇ 0.050%, Ti: 0.010% ⁇ 0.018%, residual Ni ⁇ 0.05%, Cr: 0.20% ⁇ 0.30%, residual Mo ⁇ 0.05%, residual Cu ⁇ 0.05%, residual B ⁇ 0.05%, N ⁇ 0.005%, Al: 0.020% ⁇ 0.050%, the balance is Fe and impurities.
  • the present invention obtains more ferrite structure through the unique low-carbon micro-niobium-titanium alloyed bridge composition design, which promotes the soft structure of the product. Formation, effectively increase the temperature of the second opening and the final rolling, properly judge the grain size of the structure, and stabilize the yield strength of the product. Through the conditions of water cooling, the structure transformation of carbide and chromium elements is promoted, and the yield strength is reduced while improving the tensile strength of the product. strength, effectively reducing the yield-to-tensile ratio of the product.
  • the low-cost high-performance Q370qE-HPS bridge steel mentioned above has a plate thickness of 16-30mm, and its chemical composition and mass percentage are as follows: C: 0.05%-0.07%, Si: 0.10%-0.20%, Mn: 1.61%-1.65 %, P ⁇ 0.015%, S ⁇ 0.0030%, Nb: 0.030% ⁇ 0.040%, Ti: 0.010% ⁇ 0.015%, residual Ni ⁇ 0.05%, Cr: 0.20% ⁇ 0.30%, residual Mo ⁇ 0.05%, residual Cu ⁇ 0.05%, residual B ⁇ 0.05%, N ⁇ 0.005%, Al: 0.020% ⁇ 0.050%, the balance is Fe and impurities.
  • the low-cost high-performance Q370qE-HPS bridge steel mentioned above has a plate thickness of 30-50mm, and its chemical composition and mass percentage are as follows: C: 0.06%-0.08%, Si: 0.15%-0.25%, Mn: 1.63%-1.68 %, P ⁇ 0.015%, S ⁇ 0.0030%, Nb: 0.040% ⁇ 0.050%, Ti: 0.010% ⁇ 0.015%, residual Ni ⁇ 0.05%, Cr: 0.20% ⁇ 0.30%, residual Mo ⁇ 0.05%, residual Cu ⁇ 0.05%, residual B ⁇ 0.0005%, N ⁇ 0.005%, Al: 0.020% ⁇ 0.050%, the balance is Fe and impurities.
  • the aforementioned low-cost and high-performance Q370qE-HPS bridge steel has a plate thickness of 50-60mm, and its chemical composition and mass percentage are as follows: C: 0.06%-0.08%, Si: 0.20%-0.40%, Mn: 1.65%-1.70 %, P ⁇ 0.015%, S ⁇ 0.0030%, Nb: 0.040% ⁇ 0.050%, Ti: 0.010% ⁇ 0.015%, residual Ni ⁇ 0.05%, Cr: 0.20% ⁇ 0.30%, residual Mo ⁇ 0.05%, residual Cu ⁇ 0.05%, residual B ⁇ 0.0005%, N ⁇ 0.005%, Al: 0.020% ⁇ 0.050%, the balance is Fe and impurities.
  • the microstructure of the steel plate includes ferrite, pearlite and 10% to 30% bainite.
  • Another object of the present invention is to provide a production method of low-cost and high-performance Q370qE-HPS bridge steel without tempering treatment, including preparing materials according to the composition design system ratio ⁇ molten iron pretreatment ⁇ top and bottom double blowing converter smelting ⁇ LF furnace Refining ⁇ RH vacuum treatment ⁇ slab casting ⁇ walking furnace heating ⁇ high-pressure water descaling ⁇ controlled rolling and cooling ⁇ post-rolling treatment,
  • Controlled rolling and cooling process the austenite temperature is 1100-1110°C
  • the thickness of the hot billet is adjusted by 2-4 times according to the thickness of the steel plate
  • the second opening temperature is adjusted to 820-990°C according to the thickness of the order
  • the final rolling temperature is 820 ⁇ 20°C.
  • Ultra-fast cooling to 560 ⁇ 590 °C, after the steel plate is cooled, it will be taken off the line in time and put into the slow cooling pit for stack cooling. After 24 hours of stack cooling, shearing, marking, surface inspection, flaw detection, and storage will be performed.
  • the present invention adopts high manganese chromium element, low carbon micro-niobium titanium alloy composition design according to Chinese national standard GB/T 714 structural bridge steel, adopts TMCP rolling technology to replace traditional TMCP+tempering process, Effectively reduce the cost of product manufacturing and greatly improve the competitiveness of enterprises;
  • the low-temperature austenitizing technology adopted in the present invention reduces the grain size of the prior austenite and ensures the stability of the low-temperature impact toughness of the product;
  • the present invention effectively reduces the yield strength of the product, ensures the stability of the tensile strength, and stabilizes the stability of the yield strength ratio of the product by controlling the second opening temperature and the final rolling temperature and cooperating with the water cooling process;
  • the structure transformation is reasonably carried out, and the structure including ferrite, pearlite and 10% to 30% bainite is obtained, and the harm of the banded structure is reduced. , to avoid the accumulation of harmful elements and hard phase structure in the heart, and improve the product's pass rate of flaw detection and the stability of welding performance;
  • the present invention refines the structure and grain size through the design of high manganese chromium elements, ensures the stability of the tensile strength of the product, and ensures the yield-to-strength ratio of the product by controlling the second opening temperature and the final rolling temperature;
  • the present invention effectively solves the problem of uneven internal stress of the product by stacking the steel plate, and ensures the cutting and processing stability of the customer.
  • FIG. 1 is a typical microstructure diagram of the steel sheet obtained in Example 1 under a metallographic microscope.
  • a low-cost and high-performance Q370qE-HPS bridge steel provided in the following example, the thickness of the steel plate is 22mm, 33mm, and 55mm, and its chemical composition and mass percentage are shown in Table 1.
  • Example 2 0.07 0.20 1.65 0.011 0.001 0.045 0.012 element Ni Cr Mo Cu B N Al
  • Example 2 0.02 0.26 0.008 0.03 0.0003 0.0038 0.028 element C Si Mn P S Nb Ti
  • Example 3 0.075 0.36 1.69 0.010 0.001 0.048 0.015 element Ni Cr Mo Cu B N Al
  • Example 3 0.04 0.28 0.010 0.01 0.0002 0.0042 0.033 .
  • the production method includes the following steps: preparing materials according to the above-mentioned composition design system proportioning ⁇ molten iron pretreatment ⁇ top and bottom double blowing converter smelting ⁇ LF furnace refining ⁇ RH vacuum treatment ⁇ slab casting ⁇ stepping furnace heating ⁇ high-pressure water descaling ⁇ controlled rolling Cooling ⁇ post-rolling treatment, the austenite temperature is 1100 ⁇ 1110°C, the thickness of the hot billet is adjusted by 2 ⁇ 4 times according to the thickness of the steel plate, the second opening temperature is adjusted according to the thickness of the order to 820 ⁇ 990°C, and the final rolling temperature is 820 ⁇ 20°C. Use ultra-fast cooling to cool to 560 ⁇ 590 °C.
  • the specific rolling process is shown in Table 2, and the performance is shown in Table 3.
  • Example Yield strength R El /MPa Tensile strength R m /MPa Elongation after break A/% yield strength ratio
  • Example 1 420 530 26 79 Example 2 412 526 twenty three 78
  • Example 3 450 560 twenty two 80
  • Example Shock temperature/°C Average shock absorption energy/J 180° bending test Bending result Example 1 -40 230 3a No cracks
  • the present invention adopts the TMCP rolling technology and applies a short-flow and low-cost manufacturing method to effectively eliminate the internal stress of the steel plate.
  • the developed Q370qE-HPS bridge steel satisfies the bridge factory's high-performance bridge steel plate with easy welding, high toughness and stable quality. Through cost optimization, the product manufacturing cost is effectively reduced, the competitiveness of the enterprise is improved, and the economic benefit of the enterprise is increased.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
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  • Heat Treatment Of Steel (AREA)

Abstract

The present invention relates to the technical field of steel production. Disclosed is low-cost high-performance Q370qE-HPS bridge steel, comprising the following chemical components in mass percentage: C: 0.05%-0.08%, Si: 0.10%-0.40%, Mn: 1.61%-1.70%, P≤0.015%, S≤0.0030%, Nb: 0.030%-0.050%, Ti: 0.010%-0.018%, residual Ni≤0.05%, Cr: 0.20%-0.30%, residual Mo≤0.05%, residual Cu≤0.05%, residual B≤0.05%, N≤0.005%, Al: 0.020%-0.050%, and the balance of Fe and impurities. By using a TMCP rolling process, a bridge steel plate which has a low yield ratio and excellent welding performance and satisfies standard requirements is obtained, thereby improving market competitiveness of enterprises.

Description

低成本高性能Q370qE-HPS桥梁钢及生产方法Low cost high performance Q370qE-HPS bridge steel and production method 技术领域technical field
本发明涉及钢铁生产技术领域，特别是涉及一种低成本高性能Q370qE-HPS桥梁钢及生产方法。The invention relates to the technical field of iron and steel production, in particular to a low-cost high-performance Q370qE-HPS bridge steel and a production method.
背景技术Background technique
高性能桥梁钢板Q370qE-HPS广泛用于公路桥、铁路桥、公铁两用桥，自从2010年后，在国家大力发展交通建设，桥梁用钢不断增加的背景下，大跨度的Q370级别桥梁用钢主要采用的正火钢板，正火热处理工艺冶炼工序成本在200元以上，还不包括转运的成本，钢板在正火后会出现性能不稳定、焊接接头冲击功偏低、分层等现象，或熔透角焊接层状撕裂等质量问题。High-performance bridge steel plate Q370qE-HPS is widely used in highway bridges, railway bridges, and highway-railway bridges. Since 2010, under the background of the country's vigorous development of transportation construction and the continuous increase of bridge steel The normalized steel plate mainly used in steel, the smelting process cost of the normalizing heat treatment process is more than 200 yuan, not including the cost of transportation. Or quality problems such as penetration fillet weld laminar tearing.
发明内容SUMMARY OF THE INVENTION
为了解决以上技术问题，本发明提供一种低成本高性能Q370qE-HPS桥梁钢，其化学成分及质量百分比如下：C：0.05％～0.08％，Si：0.10％～0.40％，Mn：1.61％～1.70％，P≤0.015％，S≤0.0030％，Nb：0.030％～0.050％，Ti：0.010％～0.018％，残余Ni≤0.05％，Cr：0.20％～0.30％，残余Mo≤0.05％，残余Cu≤0.05％，残余B≤0.05％，N≤0.005％，Al：0.020％～0.050％，余量为Fe和杂质。In order to solve the above technical problems, the present invention provides a low-cost high-performance Q370qE-HPS bridge steel, whose chemical composition and mass percentage are as follows: C: 0.05%-0.08%, Si: 0.10%-0.40%, Mn: 1.61%- 1.70%, P≤0.015%, S≤0.0030%, Nb: 0.030%～0.050%, Ti: 0.010%～0.018%, residual Ni≤0.05%, Cr: 0.20%～0.30%, residual Mo≤0.05%, residual Cu≤0.05%, residual B≤0.05%, N≤0.005%, Al: 0.020%～0.050%, the balance is Fe and impurities.
技术效果：本发明在精心研究国家桥梁结构钢GB/T 714标准后，通过独特的低碳微铌钛合金化桥梁成分设计，得到铁素体更多的组织结构，促进了产品软向组织的形成，有效提高二开及终轧温度，适当改判组织的晶粒度，稳定产品屈服强度，通过水冷的条件，促进了碳化物及铬元素的组织转变，降低屈服强度的同时提升产品的抗拉强度，有效降低了产品的屈强比。Technical effect: After carefully studying the national bridge structural steel GB/T 714 standard, the present invention obtains more ferrite structure through the unique low-carbon micro-niobium-titanium alloyed bridge composition design, which promotes the soft structure of the product. Formation, effectively increase the temperature of the second opening and the final rolling, properly judge the grain size of the structure, and stabilize the yield strength of the product. Through the conditions of water cooling, the structure transformation of carbide and chromium elements is promoted, and the yield strength is reduced while improving the tensile strength of the product. strength, effectively reducing the yield-to-tensile ratio of the product.
本发明进一步限定的技术方案是：The technical scheme that the present invention is further limited is:
前所述的低成本高性能Q370qE-HPS桥梁钢，板厚16～30mm，其化学成分及质量百分比如下：C：0.05％～0.07％，Si：0.10％～0.20％，Mn：1.61％～1.65％，P≤0.015％，S≤0.0030％，Nb：0.030％～0.040％，Ti：0.010％～0.015％，残余Ni ≤0.05％，Cr：0.20％～0.30％，残余Mo≤0.05％，残余Cu≤0.05％，残余B≤0.05％，N≤0.005％，Al：0.020％～0.050％，余量为Fe和杂质。The low-cost high-performance Q370qE-HPS bridge steel mentioned above has a plate thickness of 16-30mm, and its chemical composition and mass percentage are as follows: C: 0.05%-0.07%, Si: 0.10%-0.20%, Mn: 1.61%-1.65 %, P≤0.015%, S≤0.0030%, Nb: 0.030%～0.040%, Ti: 0.010%～0.015%, residual Ni≤0.05%, Cr: 0.20%～0.30%, residual Mo≤0.05%, residual Cu ≤0.05%, residual B≤0.05%, N≤0.005%, Al: 0.020%～0.050%, the balance is Fe and impurities.
前所述的低成本高性能Q370qE-HPS桥梁钢，板厚30～50mm，其化学成分及质量百分比如下：C：0.06％～0.08％，Si：0.15％～0.25％，Mn：1.63％～1.68％，P≤0.015％，S≤0.0030％，Nb：0.040％～0.050％，Ti：0.010％～0.015％，残余Ni≤0.05％，Cr：0.20％～0.30％，残余Mo≤0.05％，残余Cu≤0.05％，残余B≤0.0005％，N≤0.005％，Al：0.020％～0.050％，余量为Fe和杂质。The low-cost high-performance Q370qE-HPS bridge steel mentioned above has a plate thickness of 30-50mm, and its chemical composition and mass percentage are as follows: C: 0.06%-0.08%, Si: 0.15%-0.25%, Mn: 1.63%-1.68 %, P≤0.015%, S≤0.0030%, Nb: 0.040%～0.050%, Ti: 0.010%～0.015%, residual Ni≤0.05%, Cr: 0.20%～0.30%, residual Mo≤0.05%, residual Cu ≤0.05%, residual B≤0.0005%, N≤0.005%, Al: 0.020%～0.050%, the balance is Fe and impurities.
前所述的低成本高性能Q370qE-HPS桥梁钢，板厚50～60mm，其化学成分及质量百分比如下：C：0.06％～0.08％，Si：0.20％～0.40％，Mn：1.65％～1.70％，P≤0.015％，S≤0.0030％，Nb：0.040％～0.050％，Ti：0.010％～0.015％，残余Ni≤0.05％，Cr：0.20％～0.30％，残余Mo≤0.05％，残余Cu≤0.05％，残余B≤0.0005％，N≤0.005％，Al：0.020％～0.050％，余量为Fe和杂质。The aforementioned low-cost and high-performance Q370qE-HPS bridge steel has a plate thickness of 50-60mm, and its chemical composition and mass percentage are as follows: C: 0.06%-0.08%, Si: 0.20%-0.40%, Mn: 1.65%-1.70 %, P≤0.015%, S≤0.0030%, Nb: 0.040%～0.050%, Ti: 0.010%～0.015%, residual Ni≤0.05%, Cr: 0.20%～0.30%, residual Mo≤0.05%, residual Cu ≤0.05%, residual B≤0.0005%, N≤0.005%, Al: 0.020%～0.050%, the balance is Fe and impurities.
前所述的低成本高性能Q370qE-HPS桥梁钢，钢板显微组织包括铁素体、珠光体和10％～30％贝氏体。For the low-cost high-performance Q370qE-HPS bridge steel mentioned above, the microstructure of the steel plate includes ferrite, pearlite and 10% to 30% bainite.
本发明的另一目的在于提供一种低成本高性能Q370qE-HPS桥梁钢的生产方法，无需回火处理，包括按成分设计体系配比备料→铁水预处理→顶底复吹转炉冶炼→LF炉精炼→RH真空处理→板坯浇注→步进炉加热→高压水除鳞→控制轧制冷却→轧后处理，Another object of the present invention is to provide a production method of low-cost and high-performance Q370qE-HPS bridge steel without tempering treatment, including preparing materials according to the composition design system ratio → molten iron pretreatment → top and bottom double blowing converter smelting → LF furnace Refining → RH vacuum treatment → slab casting → walking furnace heating → high-pressure water descaling → controlled rolling and cooling → post-rolling treatment,
控制轧制冷却工艺：奥氏体温度1100～1110℃，待温坯厚度根据钢板厚度调整2～4倍，二开温度根据订单厚度调整820～990℃，终轧温度为820±20℃，采用超快冷冷却至560～590℃，钢板冷却后及时下线进缓冷坑进行堆冷，堆冷24小时后进行剪切、标识、表检、探伤、入库。Controlled rolling and cooling process: the austenite temperature is 1100-1110°C, the thickness of the hot billet is adjusted by 2-4 times according to the thickness of the steel plate, the second opening temperature is adjusted to 820-990°C according to the thickness of the order, and the final rolling temperature is 820±20°C. Ultra-fast cooling to 560 ~ 590 ℃, after the steel plate is cooled, it will be taken off the line in time and put into the slow cooling pit for stack cooling. After 24 hours of stack cooling, shearing, marking, surface inspection, flaw detection, and storage will be performed.
本发明的有益效果是：The beneficial effects of the present invention are:
(1)本发明依据中国国家标准GB/T 714结构用桥梁钢，采用了高锰铬元 素、低碳微铌钛合金化成分设计，采用了TMCP轧制技术替代了传统的TMCP+回火工艺，有效降低了产品制造成本，大幅度了提高了企业竞争力；(1) the present invention adopts high manganese chromium element, low carbon micro-niobium titanium alloy composition design according to Chinese national standard GB/T 714 structural bridge steel, adopts TMCP rolling technology to replace traditional TMCP+tempering process, Effectively reduce the cost of product manufacturing and greatly improve the competitiveness of enterprises;
(2)本发明采用的低温奥氏体化技术，降低了原始奥氏体晶粒度，保证了产品低温冲击韧性的稳定；(2) The low-temperature austenitizing technology adopted in the present invention reduces the grain size of the prior austenite and ensures the stability of the low-temperature impact toughness of the product;
(3)本发明通过控制二开温度及终轧温度，配合水冷工艺，有效降低了产品屈服强度保证了抗拉强度的稳定，稳定了产品屈强比的稳定；(3) The present invention effectively reduces the yield strength of the product, ensures the stability of the tensile strength, and stabilizes the stability of the yield strength ratio of the product by controlling the second opening temperature and the final rolling temperature and cooperating with the water cooling process;
(4)本发明通过轧制温度的控制及轧后水冷方法，合理进行了组织转变，获得包括铁素体、珠光体和10％～30％贝氏体的组织，减轻了带状组织的危害，避免心部有害元素及硬相组织的聚集，提高产品的探伤合格率及焊接性能的稳定性；(4) In the present invention, through the control of rolling temperature and the method of water cooling after rolling, the structure transformation is reasonably carried out, and the structure including ferrite, pearlite and 10% to 30% bainite is obtained, and the harm of the banded structure is reduced. , to avoid the accumulation of harmful elements and hard phase structure in the heart, and improve the product's pass rate of flaw detection and the stability of welding performance;
(5)本发明通过高锰铬元素的设计，细化了组织晶粒度，保证了产品抗拉强度的稳定，通过控制二开温度及终轧温度，保证了产的屈强比；(5) The present invention refines the structure and grain size through the design of high manganese chromium elements, ensures the stability of the tensile strength of the product, and ensures the yield-to-strength ratio of the product by controlling the second opening temperature and the final rolling temperature;
(6)本发明通过钢板堆冷，有效解决了产品内应力不均匀的问题，保证了客户分切、加工稳定性。(6) The present invention effectively solves the problem of uneven internal stress of the product by stacking the steel plate, and ensures the cutting and processing stability of the customer.
附图说明Description of drawings
图1为实施例1得到的钢板在金相显微镜下典型的组织形貌图。FIG. 1 is a typical microstructure diagram of the steel sheet obtained in Example 1 under a metallographic microscope.
具体实施方式Detailed ways
以下实施例提供的一种低成本高性能Q370qE-HPS桥梁钢，钢板厚度规格分别为22mm、33mm、55mm，其化学成分及质量百分比如表1所示，A low-cost and high-performance Q370qE-HPS bridge steel provided in the following example, the thickness of the steel plate is 22mm, 33mm, and 55mm, and its chemical composition and mass percentage are shown in Table 1.
表1实施例钢板化学成分(wt％)Table 1 Chemical composition (wt%) of steel sheets of the embodiment
元素element CC SiSi MnMn PP SS NbNb TiTi
实施例1Example 1 0.060.06 0.150.15 1.631.63 0.0130.013 0.0020.002 0.0310.031 0.0130.013
元素element NiNi CrCr MoMo CuCu BB NN AlAl
实施例1Example 1 0.030.03 0.230.23 0.0090.009 0.020.02 0.00020.0002 0.00350.0035 0.0310.031
元素element CC SiSi MnMn PP SS NbNb TiTi
实施例2 0.07 0.20 1.65 0.011 0.001 0.045 0.012
元素 Ni Cr Mo Cu B N Al
实施例2 0.02 0.26 0.008 0.03 0.0003 0.0038 0.028
元素 C Si Mn P S Nb Ti
实施例3 0.075 0.36 1.69 0.010 0.001 0.048 0.015
元素 Ni Cr Mo Cu B N Al
实施例3 0.04 0.28 0.010 0.01 0.0002 0.0042 0.033
。
Example 2 0.07 0.20 1.65 0.011 0.001 0.045 0.012
element Ni Cr Mo Cu B N Al
Example 2 0.02 0.26 0.008 0.03 0.0003 0.0038 0.028
element C Si Mn P S Nb Ti
Example 3 0.075 0.36 1.69 0.010 0.001 0.048 0.015
element Ni Cr Mo Cu B N Al
Example 3 0.04 0.28 0.010 0.01 0.0002 0.0042 0.033
.
生产方法包括以下步骤：按上述成分设计体系配比备料→铁水预处理→顶底复吹转炉冶炼→LF炉精炼→RH真空处理→板坯浇注→步进炉加热→高压水除鳞→控制轧制冷却→轧后处理，奥氏体温度1100～1110℃，待温坯厚度根据钢板厚度调整2～4倍，二开温度根据订单厚度调整820～990℃，终轧温度为820±20℃，采用超快冷冷却至560～590℃。具体轧制工艺见表2，性能见表3，The production method includes the following steps: preparing materials according to the above-mentioned composition design system proportioning → molten iron pretreatment → top and bottom double blowing converter smelting → LF furnace refining → RH vacuum treatment → slab casting → stepping furnace heating → high-pressure water descaling → controlled rolling Cooling → post-rolling treatment, the austenite temperature is 1100~1110℃, the thickness of the hot billet is adjusted by 2~4 times according to the thickness of the steel plate, the second opening temperature is adjusted according to the thickness of the order to 820~990℃, and the final rolling temperature is 820±20℃. Use ultra-fast cooling to cool to 560 ~ 590 ℃. The specific rolling process is shown in Table 2, and the performance is shown in Table 3.
表2实施例钢板的轧制工艺The rolling process of the steel plate of the embodiment of table 2
   奥氏体温度Austenite temperature 待温坯厚度Thickness of hot billet 二开温度Two open temperature 终轧温度Finishing temperature 返红温度reddish temperature
实施例1Example 1 11081108 8888 890890 839839 588588
实施例2Example 2 11091109 6666 860860 831831 580580
实施例3Example 3 11061106 110110 830830 821821 563563
表3实施例钢板的力学性能性能Table 3 Mechanical properties of the steel plates of the embodiments
实施例 屈服强度R El/MPa 抗拉强度R m/MPa 断后伸长率A/％ 屈强比
实施例1 420 530 26 79
实施例2 412 526 23 78
实施例3 450 560 22 80
实施例 冲击温度/℃ 平均冲击吸收能/J 180°弯曲试验 弯曲结果
实施例1 -40 230 3a 无裂纹
实施例2 -40 190 3a 无裂纹
实施例3 -40 180 3a 无裂纹
。
Example Yield strength R El /MPa Tensile strength R m /MPa Elongation after break A/% yield strength ratio
Example 1 420 530 26 79
Example 2 412 526 twenty three 78
Example 3 450 560 twenty two 80
Example Shock temperature/℃ Average shock absorption energy/J 180° bending test Bending result
Example 1 -40 230 3a No cracks
Example 2 -40 190 3a No cracks
Example 3 -40 180 3a No cracks
.
由图1可见，钢板组织以块状铁素体为主，含有极少量的贝氏体体，组织 均匀细小并且致密，有利于产品高强度、低屈强比、高韧性、易焊接、抗疲劳等性能。It can be seen from Figure 1 that the structure of the steel plate is dominated by massive ferrite, containing a very small amount of bainite. and other performance.
综上，本发明采用TMCP轧制技术，应用短流程、低成本的制造方法，有效消除了钢板的内应力。开发的Q370qE-HPS桥梁用钢，满足了桥梁厂易焊接、高韧性、质量稳定的高性能桥梁钢板。通过成本优化，有效降低了产品制造成本，提高了企业的竞争能力，增加了企业经济效益。To sum up, the present invention adopts the TMCP rolling technology and applies a short-flow and low-cost manufacturing method to effectively eliminate the internal stress of the steel plate. The developed Q370qE-HPS bridge steel satisfies the bridge factory's high-performance bridge steel plate with easy welding, high toughness and stable quality. Through cost optimization, the product manufacturing cost is effectively reduced, the competitiveness of the enterprise is improved, and the economic benefit of the enterprise is increased.
除上述实施例外，本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案，均落在本发明要求的保护范围。In addition to the above-described embodiments, the present invention may also have other embodiments. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims (6)

  1. 一种低成本高性能Q370qE-HPS桥梁钢，其特征在于：其化学成分及质量百分比如下：C：0.05％～0.08％，Si：0.10％～0.40％，Mn：1.61％～1.70％，P≤0.015％，S≤0.0030％，Nb：0.030％～0.050％，Ti：0.010％～0.018％，残余Ni≤0.05％，Cr：0.20％～0.30％，残余Mo≤0.05％，残余Cu≤0.05％，残余B≤0.05％，N≤0.005％，Al：0.020％～0.050％，余量为Fe和杂质。A low-cost high-performance Q370qE-HPS bridge steel, characterized in that its chemical composition and mass percentage are as follows: C: 0.05%-0.08%, Si: 0.10%-0.40%, Mn: 1.61%-1.70%, P≤ 0.015%, S≤0.0030%, Nb: 0.030%～0.050%, Ti: 0.010%～0.018%, residual Ni≤0.05%, Cr: 0.20%～0.30%, residual Mo≤0.05%, residual Cu≤0.05%, Residual B≤0.05%, N≤0.005%, Al: 0.020%～0.050%, and the balance is Fe and impurities.
  2. 根据权利要求1所述的低成本高性能Q370qE-HPS桥梁钢，其特征在于：板厚16～30mm，其化学成分及质量百分比如下：C：0.05％～0.07％，Si：0.10％～0.20％，Mn：1.61％～1.65％，P≤0.015％，S≤0.0030％，Nb：0.030％～0.040％，Ti：0.010％～0.015％，残余Ni≤0.05％，Cr：0.20％～0.30％，残余Mo≤0.05％，残余Cu≤0.05％，残余B≤0.05％，N≤0.005％，Al：0.020％～0.050％，余量为Fe和杂质。The low-cost and high-performance Q370qE-HPS bridge steel according to claim 1, characterized in that the plate thickness is 16-30mm, and its chemical composition and mass percentage are as follows: C: 0.05%-0.07%, Si: 0.10%-0.20% , Mn: 1.61%～1.65%, P≤0.015%, S≤0.0030%, Nb: 0.030%～0.040%, Ti: 0.010%～0.015%, residual Ni≤0.05%, Cr: 0.20%～0.30%, residual Mo≤0.05%, residual Cu≤0.05%, residual B≤0.05%, N≤0.005%, Al: 0.020%～0.050%, and the balance is Fe and impurities.
  3. 根据权利要求1所述的低成本高性能Q370qE-HPS桥梁钢，其特征在于：板厚30～50mm，其化学成分及质量百分比如下：C：0.06％～0.08％，Si：0.15％～0.25％，Mn：1.63％～1.68％，P≤0.015％，S≤0.0030％，Nb：0.040％～0.050％，Ti：0.010％～0.015％，残余Ni≤0.05％，Cr：0.20％～0.30％，残余Mo≤0.05％，残余Cu≤0.05％，残余B≤0.0005％，N≤0.005％，Al：0.020％～0.050％，余量为Fe和杂质。The low-cost high-performance Q370qE-HPS bridge steel according to claim 1 is characterized in that: the plate thickness is 30-50mm, and its chemical composition and mass percentage are as follows: C: 0.06%-0.08%, Si: 0.15%-0.25% , Mn: 1.63%～1.68%, P≤0.015%, S≤0.0030%, Nb: 0.040%～0.050%, Ti: 0.010%～0.015%, residual Ni≤0.05%, Cr: 0.20%～0.30%, residual Mo≤0.05%, residual Cu≤0.05%, residual B≤0.0005%, N≤0.005%, Al: 0.020%～0.050%, and the balance is Fe and impurities.
  4. 根据权利要求1所述的低成本高性能Q370qE-HPS桥梁钢，其特征在于：板厚50～60mm，其化学成分及质量百分比如下：C：0.06％～0.08％，Si：0.20％～0.40％，Mn：1.65％～1.70％，P≤0.015％，S≤0.0030％，Nb：0.040％～0.050％，Ti：0.010％～0.015％，残余Ni≤0.05％，Cr：0.20％～0.30％，残余Mo≤0.05％，残余Cu≤0.05％，残余B≤0.0005％，N≤0.005％，Al：0.020％～0.050％，余量为Fe和杂质。The low-cost and high-performance Q370qE-HPS bridge steel according to claim 1, characterized in that the plate thickness is 50-60mm, and its chemical composition and mass percentage are as follows: C: 0.06%-0.08%, Si: 0.20%-0.40% , Mn: 1.65%～1.70%, P≤0.015%, S≤0.0030%, Nb: 0.040%～0.050%, Ti: 0.010%～0.015%, residual Ni≤0.05%, Cr: 0.20%～0.30%, residual Mo≤0.05%, residual Cu≤0.05%, residual B≤0.0005%, N≤0.005%, Al: 0.020%～0.050%, and the balance is Fe and impurities.
  5. 根据权利要求1所述的低成本高性能Q370qE-HPS桥梁钢，其特征在于：钢板显微组织包括铁素体、珠光体和10％～30％贝氏体。The low-cost high-performance Q370qE-HPS bridge steel according to claim 1, wherein the microstructure of the steel plate includes ferrite, pearlite and 10% to 30% bainite.
  6. 一种低成本高性能Q370qE-HPS桥梁钢的生产方法，其特征在于：应用于权利要求1-5任意一项，无需回火处理，包括按成分设计体系配比备料→铁水预处理→顶底复吹转炉冶炼→LF炉精炼→RH真空处理→板坯浇注→步进炉加热→高压水除鳞→控制轧制冷却→轧后处理，A method for producing low-cost and high-performance Q370qE-HPS bridge steel, characterized in that: it is applied to any one of claims 1-5 without tempering treatment, and the method includes formulating materials according to the composition design system ratio → hot metal pretreatment → top and bottom Double blowing converter smelting → LF furnace refining → RH vacuum treatment → slab casting → stepping furnace heating → high pressure water descaling → controlled rolling cooling → post-rolling treatment,
    控制轧制冷却工艺：奥氏体温度1100～1110℃，待温坯厚度根据钢板厚度调整2～4倍，二开温度根据订单厚度调整820～990℃，终轧温度为820±20℃，采用超快冷冷却至560～590℃，钢板冷却后及时下线进缓冷坑进行堆冷，堆冷24小时后进行剪切、标识、表检、探伤、入库。Controlled rolling and cooling process: the austenite temperature is 1100-1110°C, the thickness of the hot billet is adjusted by 2-4 times according to the thickness of the steel plate, the second opening temperature is adjusted to 820-990°C according to the thickness of the order, and the final rolling temperature is 820±20°C. Ultra-fast cooling to 560 ~ 590 ℃, after the steel plate is cooled, it will be taken off the line in time and put into the slow cooling pit for stack cooling. After 24 hours of stack cooling, shearing, marking, surface inspection, flaw detection, and storage will be performed.
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CN115261726A (en) * 2022-08-04 2022-11-01 江苏省沙钢钢铁研究院有限公司 Super-thick Q370qE bridge steel plate and production method thereof
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