WO2020098288A1 - Q690d thick plate produced by ultra fast cooling process and manufacturing method - Google Patents

Q690d thick plate produced by ultra fast cooling process and manufacturing method Download PDF

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WO2020098288A1
WO2020098288A1 PCT/CN2019/093665 CN2019093665W WO2020098288A1 WO 2020098288 A1 WO2020098288 A1 WO 2020098288A1 CN 2019093665 W CN2019093665 W CN 2019093665W WO 2020098288 A1 WO2020098288 A1 WO 2020098288A1
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ultra
fast cooling
cooling process
thick plate
rolling
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PCT/CN2019/093665
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French (fr)
Chinese (zh)
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姜在伟
张清辉
闫强军
侯中华
姜辉
张仪杰
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南京钢铁股份有限公司
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Priority to AU2019381076A priority Critical patent/AU2019381076B2/en
Publication of WO2020098288A1 publication Critical patent/WO2020098288A1/en
Priority to ZA2021/03240A priority patent/ZA202103240B/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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot 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
    • C22C38/04—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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/26—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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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

Definitions

  • the invention relates to the technical field of metallurgy, in particular to an ultra-fast cooling process for producing Q690D thick plates and a manufacturing method.
  • the present invention provides an ultra-fast cooling process for producing Q690D thick plates. Its chemical composition and mass percentage are as follows: C: 0.05% to 0.10%, Si: 0.20% to 0.50%, Mn: 1.40% to 1.80 %, P ⁇ 0.020%, S ⁇ 0.003%, Cr: 0.10% to 0.50%, Mo: 0.018% to 0.30%, Ti: 0.008% to 0.030%, Nb: 0.015% to 0.050%, B: 0.0008% to 0.0025 %, Ceq ⁇ 0.43, and the rest are Fe and inevitable impurities.
  • the present invention adopts a low-carbon and alloyed composition design, and through the cooperation of carbon, manganese, chromium, molybdenum and other alloy elements and niobium, titanium, vanadium and other micro-alloy elements, provides a high-strength steel Q690D thick plate
  • the production process is simple, the production rhythm is fast, and the cost is low.
  • the chemical composition and mass percentage of the Q690D thick plate produced by an ultra-fast cooling process as described above are as follows: C: 0.07%, Si: 0.27%, Mn: 1.55%, P: 0.017%, S: 0.0015%, Cr: 0.20%, Mo: 0.11%, Ti: 0.015%, Nb: 0.028%, B: 0.0015%, Ceq: 0.39%, and the balance is Fe and inevitable impurities.
  • the chemical composition and mass percentage of the Q690D thick plate produced by the above-mentioned ultra-fast cooling process are as follows: C: 0.08%, Si: 0.25%, Mn: 1.51%, P: 0.014%, S: 0.0019%, Cr: 0.18%, Mo: 0.10%, Ti: 0.017%, Nb: 0.021%, B: 0.0016%, Ceq: 0.40%, the balance is Fe and inevitable impurities.
  • the aforementioned ultra-fast cooling process produces Q690D thick plates with a thickness of 50 mm.
  • Another object of the present invention is to provide a method for manufacturing Q690D thick plate by ultra-fast cooling process, which is characterized by including hot metal desulfurization pretreatment-converter smelting-LF + RH refining-continuous casting-billet slow cooling-casting billet heating- Phosphorus removal-rolling-cooling-flaw detection-shot blasting-tempering-straightening-cutting-sampling-spray printing identification-inspection-storage, in which the molten steel is subjected to continuous casting after vacuum degassing, the billet is at 1180 °C After heating at -1240 ° C, rolling is performed in the austenite recrystallization region and the non-recrystallization region.
  • the manufacturing method of the Q690D thick plate produced by the ultra-fast cooling process described above has a continuous casting billet thickness of 260 mm.
  • the manufacturing method of Q690D thick plate produced by the ultra-fast cooling process mentioned above the rolling in the recrystallization zone requires a pass reduction of above 12%, and the final rolling temperature is above 980 ° C; rolling in the non-recrystallization zone requires cumulative pressure
  • the reduction rate is above 50%, the open rolling temperature is below 900 ° C, and the final rolling temperature is above 800 ° C.
  • the manufacturing method of the Q690D thick plate produced by the ultra-fast cooling process mentioned above uses the ultra-fast cooling process after rolling.
  • the ultra-fast cooling roll speed is 0.40m / s
  • the water volume is 13000m2 / h ⁇ 15000m2 / h
  • the redness temperature is below 200 °C.
  • the manufacturing method of Q690D thick plate produced by the ultra-fast cooling process mentioned above is followed by tempering heat treatment after ultra-fast cooling, and the tempering temperature is 580 ° C-630 ° C.
  • the structure of the steel plate obtained by the present invention is tempered sorbite, the yield strength is greater than 690MPa, the tensile strength is 770MPa-930MPa, the elongation after break is greater than 35%, and the impact toughness at -20 ° C is above 150J;
  • the present invention uses ultra-fast cooling process + tempering heat treatment to produce 50mm thick high-strength steel with a yield strength of 690MPa, simple production process, fast production rhythm, strong applicability and low cost;
  • the high-strength steel plate obtained by the present invention has a low carbon equivalent Ceq ⁇ 0.43 and has good welding performance.
  • This embodiment provides an ultra-quick cooling process to produce 50mm thick Q690D steel plate. Its chemical composition and mass percentage are as follows: C: 0.07%, Si: 0.27%, Mn: 1.55%, P: 0.017%, S: 0.0015% , Cr: 0.20%, Mo: 0.11%, Ti: 0.015%, Nb: 0.028%, B: 0.0015%, Ceq: 0.39%, the rest is Fe and inevitable impurities.
  • the main production process route is: hot metal desulfurization pretreatment-converter smelting-LF + RH refining-continuous casting-slow cooling of billet-heating of casting billet-dephosphorization-rolling-cooling-flaw detection-shot blasting-tempering-straightening-cutting -Sampling-printing logo-inspection-storage.
  • the molten steel undergoes continuous casting after vacuum degassing.
  • the thickness of the continuous casting slab is 260 mm.
  • the casting slab is heated at 1180 ° C to 1240 ° C, it is rolled separately in the austenite recrystallization zone and the non-recrystallization zone. Due to the thicker plate thickness, in order to ensure the redness temperature required by the plan after rolling, the reciprocating water cooling process is used.
  • the steel plate passes through three times in the ultra-fast cooling working section, and the final redness temperature accurately hits the program requirements.
  • Rolling in the recrystallization zone requires a pass reduction of above 12% and a final rolling temperature of above 980 ° C; rolling in the non-recrystallization zone requires a cumulative reduction of above 50%, an open rolling temperature of 865 ° C and a final rolling temperature of 850 °C.
  • the ultra-fast cooling process is adopted.
  • the water inlet temperature is 810 ° C
  • the ultra-fast cooling roller speed is 0.40m / s
  • the water volume is 13500m2 / h
  • swinging back and forth 3 times and the redness temperature is 200 ° C.
  • a tempering heat treatment is carried out.
  • the tempering temperature is 610 ° C and the furnace time is 173 min.
  • This embodiment provides an ultra-fast cooling process to produce 50mm-thick Q690D steel plates.
  • the chemical composition and mass percentage are as follows: C: 0.08%, Si: 0.25%, Mn: 1.51%, P: 0.014%, S: 0.0019% , Cr: 0.18%, Mo: 0.10%, Ti: 0.017%, Nb: 0.021%, B: 0.0016%, Ceq: 0.40%, the balance is Fe and inevitable impurities.
  • the main production process route is: hot metal desulfurization pretreatment-converter smelting-LF + RH refining-continuous casting-slow cooling of billet-heating of casting billet-dephosphorization-rolling-cooling-flaw detection-shot blasting-tempering-straightening-cutting -Sampling-printing logo-inspection-storage.
  • the molten steel undergoes continuous casting after vacuum degassing.
  • the thickness of the continuous casting slab is 260 mm.
  • the casting slab is heated at 1180 ° C to 1240 ° C, it is rolled separately in the austenite recrystallization zone and the non-recrystallization zone. Due to the thicker plate thickness, in order to ensure the redness temperature required by the plan after rolling, the reciprocating water cooling process is used.
  • the steel plate passes through three times in the ultra-fast cooling working section, and the final redness temperature accurately hits the program requirements.
  • Rolling in the recrystallization zone requires a pass reduction of above 12% and a final rolling temperature of above 980 ° C; rolling in the non-recrystallization zone requires a cumulative reduction of above 50%, an open rolling temperature of 872 ° C and a final rolling temperature 855 °C.
  • the ultra-fast cooling process is adopted, the water inlet temperature is 808 °C, the ultra-fast cooling roller speed is 0.40m / s, the water volume is 14100m2 / h, the swing is reciprocated 3 times, and the redness temperature is 180 °C.
  • tempering heat treatment is carried out. The tempering temperature is 615 °C, and the furnace time is 175min.
  • Example 1 The mechanical properties of the steel plates obtained in Example 1 and Example 2 were tested, in which the strength was tested in accordance with GB / T228-2002 metal material room temperature tensile test method, and the low temperature impact toughness was tested in accordance with GB / T229-2007 Metal Charpy V-notch impact test Method determination, the results obtained are shown in the following table:
  • the performance index of the high-strength steel obtained by the present invention is greater than 690Mpa
  • the tensile strength is 770MPa-930MPa
  • the elongation after break is greater than 35%
  • the impact toughness at -20 ° C is above 150J.
  • the Q690D steel plate designed by the invention has high strength and good extensibility, and at the same time has good low temperature impact toughness, a simple process, and can be applied to coal mine machinery hydraulic supports.
  • the present invention may have other embodiments. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Abstract

Disclosed in the present invention is a Q690D thick plate produced by an ultra fast cooling process, related to the technical field of metallurgy, having the following chemical components and mass percentages thereof: C: 0.05%-0.10%, Si: 0.20%-0.50%, Mn: 1.40%-1.80%, P ≤ 0.020%, S ≤ 0.003%, Cr: 0.10%-0.50%, Mo: 0.08%-0.30%, Ti: 0.008%-0.030%, Nb: 0.015%-0.050%, B: 0.0008%-0.0025%, Ceq ≤ 0.43, and the remainder being Fe and unavoidable contaminants. The present invention uses low-carbon and alloying component design, providing a high-strength Q690D steel thick plate, the production process having a simple flow, rapid production rhythm and low cost.

Description

一种超快冷工艺生产Q690D厚板及制造方法Ultra-fast cooling process for producing Q690D thick plate and manufacturing method 技术领域Technical field
本发明涉及冶金技术领域，特别是涉及一种超快冷工艺生产Q690D厚板及制造方法。The invention relates to the technical field of metallurgy, in particular to an ultra-fast cooling process for producing Q690D thick plates and a manufacturing method.
背景技术Background technique
随着我国煤矿领域的不断高速发展，煤矿机械的要求向大吨位和大厚度发展，对高强钢的厚板需求越来越大。国内很多钢厂均采用离线淬火+回火的方式生产Q690D的厚板，生产流程长，合金含量多，成本高，碳当量高不易焊接。With the continuous high-speed development of the coal mine field in China, the requirements of coal mine machinery are developing toward large tonnage and large thickness, and the demand for thick plates of high-strength steel is increasing. Many domestic steel mills use offline quenching + tempering to produce Q690D thick plates. The production process is long, the alloy content is large, the cost is high, and the carbon equivalent is high. It is not easy to weld.
发明内容Summary of the invention
为了解决以上技术问题，本发明提供一种超快冷工艺生产Q690D厚板，其化学成分及质量百分比如下：C:0.05％～0.10％，Si:0.20％～0.50％，Mn:1.40％～1.80％，P≤0.020％，S≤0.003％，Cr:0.10％～0.50％，Mo:0.08％～0.30％，Ti:0.008％～0.030％，Nb:0.015％～0.050％，B:0.0008％～0.0025％，Ceq≤0.43，其余为Fe和不可避免的杂质。In order to solve the above technical problems, the present invention provides an ultra-fast cooling process for producing Q690D thick plates. Its chemical composition and mass percentage are as follows: C: 0.05% to 0.10%, Si: 0.20% to 0.50%, Mn: 1.40% to 1.80 %, P≤0.020%, S≤0.003%, Cr: 0.10% to 0.50%, Mo: 0.018% to 0.30%, Ti: 0.008% to 0.030%, Nb: 0.015% to 0.050%, B: 0.0008% to 0.0025 %, Ceq≤0.43, and the rest are Fe and inevitable impurities.
技术效果：本发明采用低碳和合金化的成分设计，并通过碳、锰、铬、钼等合金元素以及铌、钛、钒等微合金元素的相互配合作用，提供一种高强钢Q690D厚板，生产工艺流程简单，生产节奏快，成本低。Technical effect: The present invention adopts a low-carbon and alloyed composition design, and through the cooperation of carbon, manganese, chromium, molybdenum and other alloy elements and niobium, titanium, vanadium and other micro-alloy elements, provides a high-strength steel Q690D thick plate The production process is simple, the production rhythm is fast, and the cost is low.
本发明进一步限定的技术方案是：The technical solution further defined by the present invention is:
前所述的一种超快冷工艺生产Q690D厚板，其化学成分及质量百分比如下：C:0.07％，Si:0.27％，Mn:1.55％，P:0.017％，S:0.0015％，Cr:0.20％，Mo:0.11％，Ti:0.015％，Nb:0.028％，B:0.0015％，Ceq:0.39％，其余为Fe和不可避免的杂质。The chemical composition and mass percentage of the Q690D thick plate produced by an ultra-fast cooling process as described above are as follows: C: 0.07%, Si: 0.27%, Mn: 1.55%, P: 0.017%, S: 0.0015%, Cr: 0.20%, Mo: 0.11%, Ti: 0.015%, Nb: 0.028%, B: 0.0015%, Ceq: 0.39%, and the balance is Fe and inevitable impurities.
前所述的一种超快冷工艺生产Q690D厚板，其化学成分及质量百分比如下：C:0.08％，Si:0.25％，Mn:1.51％，P:0.014％，S:0.0019％，Cr:0.18％，Mo:0.10％，Ti:0.017％，Nb:0.021％，B:0.0016％，Ceq:0.40％，其余为Fe和不可避免的杂质。The chemical composition and mass percentage of the Q690D thick plate produced by the above-mentioned ultra-fast cooling process are as follows: C: 0.08%, Si: 0.25%, Mn: 1.51%, P: 0.014%, S: 0.0019%, Cr: 0.18%, Mo: 0.10%, Ti: 0.017%, Nb: 0.021%, B: 0.0016%, Ceq: 0.40%, the balance is Fe and inevitable impurities.
前所述的一种超快冷工艺生产Q690D厚板，所得钢板厚度为50mm。The aforementioned ultra-fast cooling process produces Q690D thick plates with a thickness of 50 mm.
本发明的另一目的在于提供一种超快冷工艺生产Q690D厚板制造方法，其特征在于：包括铁水脱硫预处理-转炉冶炼-LF+RH精炼-连铸-坯料缓冷-铸坯加热-除磷-轧制-冷却-探伤-抛丸-回火-矫直-切割-取样-喷印标识-检验-入库，其中，钢水经真空脱气处理后进行连铸，铸坯于1180℃～1240℃加热后在奥氏体再结晶区和未再结晶区分别进行轧制。Another object of the present invention is to provide a method for manufacturing Q690D thick plate by ultra-fast cooling process, which is characterized by including hot metal desulfurization pretreatment-converter smelting-LF + RH refining-continuous casting-billet slow cooling-casting billet heating- Phosphorus removal-rolling-cooling-flaw detection-shot blasting-tempering-straightening-cutting-sampling-spray printing identification-inspection-storage, in which the molten steel is subjected to continuous casting after vacuum degassing, the billet is at 1180 ℃ After heating at -1240 ° C, rolling is performed in the austenite recrystallization region and the non-recrystallization region.
前所述的一种超快冷工艺生产Q690D厚板制造方法，连铸的铸坯厚度为260mm。The manufacturing method of the Q690D thick plate produced by the ultra-fast cooling process described above has a continuous casting billet thickness of 260 mm.
前所述的一种超快冷工艺生产Q690D厚板制造方法，再结晶区轧制要求道次压下率在12％以上，终轧温度在980℃以上；未再结晶区轧制要求累积压下率在50％以上，开轧温度在900℃以下，终轧温度在800℃以上。The manufacturing method of Q690D thick plate produced by the ultra-fast cooling process mentioned above, the rolling in the recrystallization zone requires a pass reduction of above 12%, and the final rolling temperature is above 980 ° C; rolling in the non-recrystallization zone requires cumulative pressure The reduction rate is above 50%, the open rolling temperature is below 900 ° C, and the final rolling temperature is above 800 ° C.
前所述的一种超快冷工艺生产Q690D厚板制造方法，轧后采用超快冷工艺，超快冷辊速为0.40m/s,水量为13000㎡/h～15000㎡/h，摆动往复3次，返红温度200℃以下。The manufacturing method of the Q690D thick plate produced by the ultra-fast cooling process mentioned above uses the ultra-fast cooling process after rolling. The ultra-fast cooling roll speed is 0.40m / s, the water volume is 13000㎡ / h ～ 15000㎡ / h, and swings back and forth 3 times, the redness temperature is below 200 ℃.
前所述的一种超快冷工艺生产Q690D厚板制造方法，超快冷后进行回火热处理，回火温度为580℃～630℃。The manufacturing method of Q690D thick plate produced by the ultra-fast cooling process mentioned above is followed by tempering heat treatment after ultra-fast cooling, and the tempering temperature is 580 ° C-630 ° C.
本发明的有益效果是：The beneficial effects of the present invention are:
(1)本发明所得钢板的组织为回火索氏体，屈服强度大于690MPa，抗拉强度为770MPa～930MPa，断后延伸率大于35％，-20℃冲击韧性在150J以上；(1) The structure of the steel plate obtained by the present invention is tempered sorbite, the yield strength is greater than 690MPa, the tensile strength is 770MPa-930MPa, the elongation after break is greater than 35%, and the impact toughness at -20 ° C is above 150J;
(2)本发明用超快冷工艺+回火热处理生产出屈服强度690MPa级别50mm厚高强钢，生产工艺流程简单，生产节奏快，适用性强，成本低；(2) The present invention uses ultra-fast cooling process + tempering heat treatment to produce 50mm thick high-strength steel with a yield strength of 690MPa, simple production process, fast production rhythm, strong applicability and low cost;
(3)本发明得到的高强钢板碳当量低Ceq≤0.43，具有良好的焊接性能。(3) The high-strength steel plate obtained by the present invention has a low carbon equivalent Ceq≤0.43 and has good welding performance.
具体实施方式detailed description
实施例1Example 1
本实施例提供的一种超快冷工艺生产规格50mm厚Q690D钢板，其化学成分及质量百分比如下：C:0.07％，Si:0.27％，Mn:1.55％，P:0.017％，S:0.0015％，Cr:0.20％，Mo:0.11％，Ti:0.015％，Nb:0.028％，B:0.0015％，Ceq:0.39％，其余为Fe和不可避免的杂质。This embodiment provides an ultra-quick cooling process to produce 50mm thick Q690D steel plate. Its chemical composition and mass percentage are as follows: C: 0.07%, Si: 0.27%, Mn: 1.55%, P: 0.017%, S: 0.0015% , Cr: 0.20%, Mo: 0.11%, Ti: 0.015%, Nb: 0.028%, B: 0.0015%, Ceq: 0.39%, the rest is Fe and inevitable impurities.
主要生产工艺路线为：铁水脱硫预处理-转炉冶炼-LF+RH精炼-连铸-坯料缓冷-铸坯加热-除磷-轧制-冷却-探伤-抛丸-回火-矫直-切割-取样-喷印标识-检验-入库。The main production process route is: hot metal desulfurization pretreatment-converter smelting-LF + RH refining-continuous casting-slow cooling of billet-heating of casting billet-dephosphorization-rolling-cooling-flaw detection-shot blasting-tempering-straightening-cutting -Sampling-printing logo-inspection-storage.
钢水经真空脱气处理后进行连铸，连铸的铸坯厚度为260mm，铸坯于1180℃～1240℃加热后在奥氏体再结晶区和未再结晶区分别进行轧制。由于板厚较厚，轧后为保证实现方案要求的返红温度，采用往复式水冷工艺，钢板在超快冷工作段往复通过3次，最终返红温度准确命中方案要求。The molten steel undergoes continuous casting after vacuum degassing. The thickness of the continuous casting slab is 260 mm. After the casting slab is heated at 1180 ° C to 1240 ° C, it is rolled separately in the austenite recrystallization zone and the non-recrystallization zone. Due to the thicker plate thickness, in order to ensure the redness temperature required by the plan after rolling, the reciprocating water cooling process is used. The steel plate passes through three times in the ultra-fast cooling working section, and the final redness temperature accurately hits the program requirements.
再结晶区轧制要求道次压下率在12％以上，终轧温度在980℃以上；未再结晶区轧制要求累积压下率在50％以上，开轧温度865℃，终轧温度850℃。轧后采用超快冷工艺，入水温度810℃，超快冷辊速为0.40m/s,水量为13500㎡/h，摆动往复3次，返红温度200℃。超快冷后进行回火热处理，回火温度为610℃，在炉时间173min。Rolling in the recrystallization zone requires a pass reduction of above 12% and a final rolling temperature of above 980 ° C; rolling in the non-recrystallization zone requires a cumulative reduction of above 50%, an open rolling temperature of 865 ° C and a final rolling temperature of 850 ℃. After rolling, the ultra-fast cooling process is adopted. The water inlet temperature is 810 ° C, the ultra-fast cooling roller speed is 0.40m / s, the water volume is 13500㎡ / h, swinging back and forth 3 times, and the redness temperature is 200 ° C. After ultra-fast cooling, a tempering heat treatment is carried out. The tempering temperature is 610 ° C and the furnace time is 173 min.
实施例2Example 2
本实施例提供的一种超快冷工艺生产规格50mm厚Q690D钢板，其化学成分及质量百分比如下：C:0.08％，Si:0.25％，Mn:1.51％，P:0.014％，S:0.0019％，Cr:0.18％，Mo:0.10％，Ti:0.017％，Nb:0.021％，B:0.0016％，Ceq:0.40％，其余为Fe和不可避免的杂质。This embodiment provides an ultra-fast cooling process to produce 50mm-thick Q690D steel plates. The chemical composition and mass percentage are as follows: C: 0.08%, Si: 0.25%, Mn: 1.51%, P: 0.014%, S: 0.0019% , Cr: 0.18%, Mo: 0.10%, Ti: 0.017%, Nb: 0.021%, B: 0.0016%, Ceq: 0.40%, the balance is Fe and inevitable impurities.
主要生产工艺路线为：铁水脱硫预处理-转炉冶炼-LF+RH精炼-连铸-坯料缓冷-铸坯加热-除磷-轧制-冷却-探伤-抛丸-回火-矫直-切割-取样-喷印标识-检 验-入库。The main production process route is: hot metal desulfurization pretreatment-converter smelting-LF + RH refining-continuous casting-slow cooling of billet-heating of casting billet-dephosphorization-rolling-cooling-flaw detection-shot blasting-tempering-straightening-cutting -Sampling-printing logo-inspection-storage.
钢水经真空脱气处理后进行连铸，连铸的铸坯厚度为260mm，铸坯于1180℃～1240℃加热后在奥氏体再结晶区和未再结晶区分别进行轧制。由于板厚较厚，轧后为保证实现方案要求的返红温度，采用往复式水冷工艺，钢板在超快冷工作段往复通过3次，最终返红温度准确命中方案要求。The molten steel undergoes continuous casting after vacuum degassing. The thickness of the continuous casting slab is 260 mm. After the casting slab is heated at 1180 ° C to 1240 ° C, it is rolled separately in the austenite recrystallization zone and the non-recrystallization zone. Due to the thicker plate thickness, in order to ensure the redness temperature required by the plan after rolling, the reciprocating water cooling process is used. The steel plate passes through three times in the ultra-fast cooling working section, and the final redness temperature accurately hits the program requirements.
再结晶区轧制要求道次压下率在12％以上，终轧温度在980℃以上；未再结晶区轧制要求累积压下率在50％以上，开轧温度在872℃，终轧温度855℃。轧后采用超快冷工艺，入水温度808℃，超快冷辊速为0.40m/s,水量为14100㎡/h，摆动往复3次，返红温度180℃。超快冷后进行回火热处理，回火温度为615℃，在炉时间175min。Rolling in the recrystallization zone requires a pass reduction of above 12% and a final rolling temperature of above 980 ° C; rolling in the non-recrystallization zone requires a cumulative reduction of above 50%, an open rolling temperature of 872 ° C and a final rolling temperature 855 ℃. After rolling, the ultra-fast cooling process is adopted, the water inlet temperature is 808 ℃, the ultra-fast cooling roller speed is 0.40m / s, the water volume is 14100㎡ / h, the swing is reciprocated 3 times, and the redness temperature is 180 ℃. After ultra-fast cooling, tempering heat treatment is carried out. The tempering temperature is 615 ℃, and the furnace time is 175min.
对实施例1、实施例2所得钢板进行力学性能测试，其中强度按照GB/T228-2002金属材料室温拉伸试验方法进行，低温冲击韧性按GB/T 229-2007金属夏比V型缺口冲击试验方法测定，得到的结果如下表所示：The mechanical properties of the steel plates obtained in Example 1 and Example 2 were tested, in which the strength was tested in accordance with GB / T228-2002 metal material room temperature tensile test method, and the low temperature impact toughness was tested in accordance with GB / T229-2007 Metal Charpy V-notch impact test Method determination, the results obtained are shown in the following table:
Figure PCTCN2019093665-appb-000001
Figure PCTCN2019093665-appb-000001
由表可知，本发明所得的高强钢的性能指标屈服强度大于690Mpa，抗拉强度为770MPa～930MPa，断后延伸率大于35％，-20℃冲击韧性在150J以上。可见本发明设计的Q690D钢板具有较高的强度和良好的延伸性，同时具有较好的低温冲击韧性，工艺简单，可以应用到煤矿机械液压支架上。It can be seen from the table that the performance index of the high-strength steel obtained by the present invention is greater than 690Mpa, the tensile strength is 770MPa-930MPa, the elongation after break is greater than 35%, and the impact toughness at -20 ° C is above 150J. It can be seen that the Q690D steel plate designed by the invention has high strength and good extensibility, and at the same time has good low temperature impact toughness, a simple process, and can be applied to coal mine machinery hydraulic supports.
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 embodiments, the present invention may have other embodiments. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims (9)

  1. 一种超快冷工艺生产Q690D厚板，其特征在于，其化学成分及质量百分比如下：C:0.05％～0.10％，Si:0.20％～0.50％，Mn:1.40％～1.80％，P≤0.020％，S≤0.003％，Cr:0.10％～0.50％，Mo:0.08％～0.30％，Ti:0.008％～0.030％，Nb:0.015％～0.050％，B:0.0008％～0.0025％，Ceq≤0.43，其余为Fe和不可避免的杂质。An ultra-fast cooling process for producing Q690D thick plate is characterized by its chemical composition and mass percentage as follows: C: 0.05% ～ 0.10%, Si: 0.20% ～ 0.50%, Mn: 1.40% ～ 1.80%, P≤0.020 %, S ≤ 0.003%, Cr: 0.10% to 0.50%, Mo: 0.08% to 0.30%, Ti: 0.008% to 0.030%, Nb: 0.015% to 0.050%, B: 0.0008% to 0.0025%, Ceq ≤ 0.43 , The rest is Fe and inevitable impurities.
  2. 根据权利要求1所述的一种超快冷工艺生产Q690D厚板，其特征在于，其化学成分及质量百分比如下：C:0.07％，Si:0.27％，Mn:1.55％，P:0.017％，S:0.0015％，Cr:0.20％，Mo:0.11％，Ti:0.015％，Nb:0.028％，B:0.0015％，Ceq:0.39％，其余为Fe和不可避免的杂质。The Q690D thick plate produced by an ultra-fast cooling process according to claim 1, characterized in that its chemical composition and mass percentage are as follows: C: 0.07%, Si: 0.27%, Mn: 1.55%, P: 0.017%, S: 0.0015%, Cr: 0.20%, Mo: 0.11%, Ti: 0.015%, Nb: 0.028%, B: 0.0015%, Ceq: 0.39%, and the rest are Fe and inevitable impurities.
  3. 根据权利要求1所述的一种超快冷工艺生产Q690D厚板，其特征在于，其化学成分及质量百分比如下：C:0.08％，Si:0.25％，Mn:1.51％，P:0.014％，S:0.0019％，Cr:0.18％，Mo:0.10％，Ti:0.017％，Nb:0.021％，B:0.0016％，Ceq:0.40％，其余为Fe和不可避免的杂质。The Q690D thick plate produced by an ultra-fast cooling process according to claim 1, characterized in that its chemical composition and mass percentage are as follows: C: 0.08%, Si: 0.25%, Mn: 1.51%, P: 0.014%, S: 0.0019%, Cr: 0.18%, Mo: 0.10%, Ti: 0.017%, Nb: 0.021%, B: 0.0016%, Ceq: 0.40%, and the rest are Fe and inevitable impurities.
  4. 根据权利要求1所述的一种超快冷工艺生产Q690D厚板，其特征在于：所得钢板厚度为50mm。The Q690D thick plate is produced by an ultra-fast cooling process according to claim 1, wherein the thickness of the obtained steel plate is 50 mm.
  5. 一种超快冷工艺生产Q690D厚板制造方法，其特征在于：包括铁水脱硫预处理-转炉冶炼-LF+RH精炼-连铸-坯料缓冷-铸坯加热-除磷-轧制-冷却-探伤-抛丸-回火-矫直-切割-取样-喷印标识-检验-入库，其中，钢水经真空脱气处理后进行连铸，连铸坯1180℃～1240℃加热后在奥氏体再结晶区和未再结晶区分别进行轧制。A manufacturing method of Q690D thick plate produced by ultra-fast cooling process, which is characterized by including hot metal desulfurization pretreatment-converter smelting-LF + RH refining-continuous casting-billet slow cooling-casting billet heating-dephosphorization-rolling-cooling- Flaw detection-shot blasting-tempering-straightening-cutting-sampling-spray marking-inspection-storage, in which the molten steel is subjected to continuous casting after vacuum degassing treatment, the continuous casting billet is heated at 1180 ℃ ~ 1240 ℃ and then in Austenitic The bulk recrystallization zone and the non-recrystallization zone are rolled separately.
  6. 根据权利要求5所述的一种超快冷工艺生产Q690D厚板制造方法，其特征在于：连铸的铸坯厚度为260mm。The manufacturing method of Q690D thick plate produced by ultra-fast cooling process according to claim 5, characterized in that the thickness of the continuous casting slab is 260mm.
  7. 根据权利要求5所述的一种超快冷工艺生产Q690D厚板制造方法，其特征在于：再结晶区轧制要求道次压下率在12％以上，终轧温度在980℃以上；未再结晶区轧制要求累积压下率在50％以上，开轧温度在900℃以下， 终轧温度在800℃以上。The manufacturing method of Q690D thick plate produced by ultra-fast cooling process according to claim 5, characterized in that: rolling in the recrystallization zone requires a pass reduction rate of more than 12% and a final rolling temperature of more than 980 ° C; Rolling in the crystallization zone requires that the cumulative reduction ratio be above 50%, the open rolling temperature be below 900 ° C, and the final rolling temperature be above 800 ° C.
  8. 根据权利要求7所述的一种超快冷工艺生产Q690D厚板制造方法，其特征在于：轧后采用超快冷工艺，超快冷辊速为0.40m/s,水量为13000㎡/h～15000㎡/h，摆动往复3次，返红温度200℃以下。The manufacturing method of Q690D thick plate produced by the ultra-fast cooling process according to claim 7, characterized in that: the ultra-fast cooling process is adopted after rolling, the ultra-fast cooling roll speed is 0.40m / s, and the water volume is 13000㎡ / h ～ 15000㎡ / h, swinging back and forth 3 times, the redness temperature is below 200 ℃.
  9. 根据权利要求8所述的一种超快冷工艺生产Q690D厚板制造方法，其特征在于：超快冷后进行回火热处理，回火温度为580℃～630℃。The manufacturing method of Q690D thick plate produced by ultra-fast cooling process according to claim 8, characterized in that tempering heat treatment is performed after ultra-fast cooling, and the tempering temperature is 580 ° C-630 ° C.
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