WO2020113951A1 - 一种tmcp态船舶voc储罐用低温钢板及制造方法 - Google Patents

一种tmcp态船舶voc储罐用低温钢板及制造方法 Download PDF

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WO2020113951A1
WO2020113951A1 PCT/CN2019/093667 CN2019093667W WO2020113951A1 WO 2020113951 A1 WO2020113951 A1 WO 2020113951A1 CN 2019093667 W CN2019093667 W CN 2019093667W WO 2020113951 A1 WO2020113951 A1 WO 2020113951A1
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rolling
temperature
steel plate
low
tmcp
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PCT/CN2019/093667
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English (en)
French (fr)
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张晓雪
赵晋斌
车马俊
邱保文
崔强
陈林恒
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南京钢铁股份有限公司
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Priority to KR1020217017767A priority Critical patent/KR20210092244A/ko
Publication of WO2020113951A1 publication Critical patent/WO2020113951A1/zh

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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
    • C22C38/04—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
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/06—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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • C21D2211/002—Bainite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite

Definitions

  • the invention relates to the technical field of metallurgy, in particular to a low-temperature steel plate for TMCP state ship VOC storage tanks and a manufacturing method.
  • VOC flue gas recovery system The ship's VOC system is called "Volatile Organic Compound Recovery System". It is a pioneering technology for the manufacture of liquefied natural gas and the recovery of volatile organic compound mixed fuel. The system recovers the gas evaporated from the oil tank, and LNG ( Liquefied natural gas) is used as a fuel for ships, thereby reducing the need for fueling ships. The system not only effectively reduces CO 2 emissions, but also greatly reduces fuel demand, with significant energy saving and environmental protection benefits. VOC flue gas recovery system adopts low temperature pressure design, which requires that the steel plate not only has high strength, excellent low temperature toughness, good strength and toughness to match the comprehensive mechanical properties, but also be easy to weld, form, and low stress.
  • the steel plate for storage tank has low welding crack sensitivity, excellent welding performance, high strength, good low temperature toughness and impact load resistance, but it is produced by quenching and tempering process.
  • Ni In order to improve low temperature toughness, Ni, The composition design of Cr and Mo increases the process cost and alloy cost of the steel plate.
  • the present invention provides a low temperature steel plate for TMCP ship VOC storage tanks, the chemical composition and mass percentage are as follows: C: 0.04% to 0.09%, Si: 0.15% to 0.50%, Mn: 1.20% to 1.60%, P ⁇ 0.010%, S ⁇ 0.002%, Alt: 0.025% ⁇ 0.070%, N ⁇ 0.0040%, Ni ⁇ 0.40%, Nb+V+Ti ⁇ 0.050%, the balance is Fe and inevitable impurities.
  • the present invention uses the TMCP process to produce low-temperature toughness and excellent welding performance of low-temperature steel plates for VOC storage tanks, without adding Ni, Mo, Cr and other alloying elements, the resulting product has good overall performance.
  • the low temperature steel plate for VOC storage tanks of TMCP ships mentioned above has the following chemical composition and mass percentage: C: 0.082%, Si: 0.30%, Mn: 1.52%, P: 0.008%, S: 0.0010%, Alt : 0.058%, N: 0.0033%, Ni ⁇ 0.40%, Nb: 0.012%, Ti: 0.014%, the balance is Fe and inevitable impurities.
  • the low temperature steel plate for VOC storage tanks of TMCP ship mentioned above has the following chemical composition and mass percentage: C: 0.065%, Si: 0.21%, Mn: 1.60%, P: 0.006%, S: 0.0019%, Alt : 0.055%, N: 0.0037%, Ni ⁇ 0.40%, Nb: 0.025%, Ti: 0.011%, the balance is Fe and inevitable impurities.
  • the aforementioned low temperature steel plate for TMCP ship VOC storage tank has the following chemical composition and mass percentage: C: 0.090%, Si: 0.24%, Mn: 1.35%, P: 0.005%, S: 0.0015%, Alt : 0.035%, N: 0.0038%, Ni ⁇ 0.40%, Nb: 0.015%, Ti: 0.018%, the balance is Fe and inevitable impurities.
  • the present invention provides a method for manufacturing low-temperature steel plates for TMCP ship VOC storage tanks, including hot metal desulfurization pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, casting billet heating, controlled rolling, and controlled cooling after rolling.
  • the heating temperature of the billet is 1120 ⁇ 1150°C, and the heating time of the billet is 25 ⁇ 45min;
  • Controlled rolling adopts two-stage controlled rolling, including rolling in the recrystallization zone and rolling in the non-recrystallization zone.
  • the cumulative reduction rate of rough rolling is ⁇ 50%, and the single pass reduction rate of finishing rolling is ⁇ 10%.
  • the final rolling temperature is 760 ⁇ 820°C;
  • ACC is used to accelerate cooling, the water inlet temperature is 730 ⁇ 770°C, and the redness temperature is 540 ⁇ 580°C;
  • the steel plate After accelerated cooling, the steel plate is straightened by a pre-straightener for 1 to 5 passes, and then air-cooled to room temperature.
  • the present invention uses the TMCP process, the process cost is significantly lower than the steel plate produced by the traditional normalizing and tempering process;
  • the present invention adopts two-stage controlled rolling, and ACC controlled cooling after rolling.
  • the structure is refined ferrite + pearlite + a small amount of low-carbon bainite, in which bainite content ⁇ 10%, ferrite
  • the grain size is 10.0 ⁇ 13.5, the steel plate has excellent low temperature toughness, low yield ratio, and good overall performance;
  • the steel plate of the present invention has excellent low temperature toughness, and after stress relief heat treatment, it still maintains a good strength-toughness match;
  • the present invention is conducive to simplifying the process, reducing costs, and mass production.
  • FIG. 1 is a metallographic structure diagram of Example 1.
  • FIG. 1 is a metallographic structure diagram of Example 1.
  • This embodiment provides a low-temperature steel plate for a VCP storage tank of a TMCP ship and its manufacturing method. Its chemical composition and mass percentage are as follows: C: 0.082%, Si: 0.30%, Mn: 1.52%, P: 0.008%, S: 0.0010%, Alt: 0.058%, N: 0.0033%, Ni ⁇ 0.40%, Nb: 0.012%, Ti: 0.014%, the balance is Fe and inevitable impurities.
  • Its manufacturing methods include hot metal desulfurization pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, billet heating, controlled rolling, and controlled cooling after rolling:
  • the heating temperature of the slab is 1130°C, and the heating time of the slab is 25 ⁇ 45min;
  • Controlled rolling adopts two-stage controlled rolling, including rolling in the recrystallization zone and rolling in the non-recrystallization zone, the cumulative reduction rate of rough rolling is ⁇ 50%, the rolling temperature of finishing rolling is 876°C, single pass rolling Lower rate ⁇ 10%, final rolling temperature is 806°C;
  • ACC is used to accelerate cooling, the water inlet temperature is 753°C, and the redness temperature is 550°C;
  • the steel plate After accelerated cooling, the steel plate is straightened by a pre-straightener for 1 to 5 passes, and then air-cooled to room temperature.
  • This embodiment provides a low-temperature steel plate for TMCP ship VOC storage tank and its manufacturing method. Its chemical composition and mass percentage are as follows: C: 0.065%, Si: 0.21%, Mn: 1.60%, P: 0.006%, S: 0.0019%, Alt: 0.055%, N: 0.0037%, Ni ⁇ 0.40%, Nb: 0.025%, Ti: 0.011%, the balance is Fe and inevitable impurities.
  • Its manufacturing methods include hot metal desulfurization pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, billet heating, controlled rolling, and controlled cooling after rolling:
  • the heating temperature of the slab is 1150°C, and the heating time of the slab is 25 ⁇ 45min;
  • Controlled rolling adopts two-stage controlled rolling, including rolling in the recrystallization zone and rolling in the non-recrystallization zone, the cumulative reduction rate of rough rolling is ⁇ 50%, the rolling temperature of finishing rolling is 842°C, single pass rolling Lower rate ⁇ 10%, final rolling temperature is 815°C;
  • ACC is used to accelerate cooling, the water inlet temperature is 768°C, and the redness temperature is 580°C;
  • the steel plate After accelerated cooling, the steel plate is straightened by a pre-straightener for 1 to 5 passes, and then air-cooled to room temperature.
  • This embodiment provides a low-temperature steel plate for TMCP ship VOC storage tank and its manufacturing method, the chemical composition and mass percentage are as follows: C: 0.090%, Si: 0.24%, Mn: 1.35%, P: 0.005%, S: 0.0015%, Alt: 0.035%, N: 0.0038%, Ni ⁇ 0.40%, Nb: 0.015%, Ti: 0.018%, the balance is Fe and inevitable impurities.
  • Its manufacturing methods include hot metal desulfurization pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, billet heating, controlled rolling, and controlled cooling after rolling:
  • the heating temperature of the slab is 1120°C, and the heating time of the slab is 25 ⁇ 45min;
  • Controlled rolling adopts two-stage controlled rolling, including rolling in the recrystallization zone and rolling in the non-recrystallization zone, the cumulative reduction rate of rough rolling is ⁇ 50%, the rolling temperature of finishing rolling is 847°C, and the single pass Lower rate ⁇ 10%, final rolling temperature is 793°C;
  • ACC is used to accelerate cooling, the water inlet temperature is 759°C, and the redness temperature is 540°C;
  • the steel plate After accelerated cooling, the steel plate is straightened by a pre-straightener for 1 to 5 passes, and then air-cooled to room temperature.
  • Example 2 In order to eliminate the internal stress of the steel plate, tempering heat treatment is carried out in Example 1, and the performance of the steel plate after stress relief treatment is shown in Table 2:
  • the structure of the steel sheet obtained by the present invention is refined ferrite + pearlite + a small amount of low-carbon bainite, in which the bainite content is ⁇ 10%, and the ferrite grain size is 10.0 to 13.5
  • the steel plate has excellent low temperature toughness, low yield ratio, and good overall performance.
  • 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.

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Abstract

本发明公开了一种TMCP态船舶VOC储罐用低温钢板，涉及冶金技术领域，其化学成分及质量百分比如下：C：0.04％～0.09％，Si：0.15％～0.50％，Mn：1.20％～1.60％，P≤0.010％，S≤0.002％，Alt：0.025％～0.070％，N≤0.0040％，Ni≤0.40％，Nb+V+Ti≤0.050％，余量为Fe和不可避免的杂质。本发明成分设计和生产工艺简单，组织均匀，综合性能优异，满足船舶VOC储罐用钢的要求，有利于简化工艺，降低成本，有利于批量生产。

Description

一种TMCP态船舶VOC储罐用低温钢板及制造方法 技术领域
本发明涉及冶金技术领域，特别是涉及一种TMCP态船舶VOC储罐用低温钢板及制造方法。
背景技术
船舶VOC系统全称为“挥发性有机化合物回收系统”，是一项用于制造液化天然气和回收挥发性有机化合物混合燃料的开拓性技术，该系统将从油仓蒸发出来的气体回收，与LNG(液化天然气)混合作为船舶燃料使用，从而降低船舶的燃料加注需求。该系统不但有效减少CO 2排放，而且大幅降低燃料需求，具有显著的节能和环保效益。VOC烟气回收系统采用低温压力设计，要求钢板不但具有高强度、优异的低温韧性、良好的强韧性匹配综合力学性能，而且要易焊接、易成形、低应力等。
对于低温韧性要求较高的压力容器用钢，一般采用淬火加回火工艺生产，为提高低温韧性需要添加Ni、Cr、Mo的方法，这样一来会使合金成本大幅度提高，不利于大批量低成本制造。如：
现有专利CN104831181A号“一种LPG船用储罐用钢板及其制造方法”，该钢板化学成分及质量百分比为：C:0.05～0.095％，Si≤0.30％，Mn:0.70～1.35％，P≤0.015％，S≤0.008％，Alt:0.020～0.060％，Cu:0.15～0.30％，Ni:0.15～0.80％，Cr:0.05～0.35％，Mo:0.15～0.35％，Ti:0.008～0.020％，以及元素Nb、V、B三种中的一种或多种，Nb:0.015～0.065％或V：0.030～0.060％或B：0.0005～0.0020％，其余为Fe及不可避免的杂质。其储罐用钢板具备低焊接裂纹敏感性，焊接性能优异，且具有高强度、很好的低温韧性和抗冲击载荷能力，但是其采用淬火加回火工艺生产，为了提高低温韧性采用添加Ni、Cr、Mo的成份设计，增加了钢板的工序成本和合金成本。
现有专利CN104674110号“一种压力容器用低温钢板”，该钢板化学成分及 质量百分比为：C：0.03～0.07％，Si：0.15～0.3％，Ni：6.8～8.0％，Mn：0.6～0.9％，P≤0.005％，S≤0.005％，Al：0.02％～0.04％，Mo：0.01～0.2％，Nb：0.01％～0.09％，其余为Fe和不可避免的杂质，该钢板为提高强韧性添加了高含量的Ni元素，造成合金成本的升高。
发明内容
为了解决以上技术问题，本发明提供一种TMCP态船舶VOC储罐用低温钢板，其化学成分及质量百分比如下：C：0.04％～0.09％，Si：0.15％～0.50％，Mn：1.20％～1.60％，P≤0.010％，S≤0.002％，Alt：0.025％～0.070％，N≤0.0040％，Ni≤0.40％，Nb+V+Ti≤0.050％，余量为Fe和不可避免的杂质。
技术效果：本发明采用TMCP工艺生产低温韧性、焊接性能优异的VOC储罐用低温钢板，在不添加Ni、Mo、Cr等合金元素的情况下，得到的产品综合性能良好。
本发明进一步限定的技术方案是：
前所述的一种TMCP态船舶VOC储罐用低温钢板，其化学成分及质量百分比如下：C：0.082％，Si：0.30％，Mn：1.52％，P:0.008％，S:0.0010％，Alt：0.058％，N：0.0033％，Ni≤0.40％，Nb:0.012％，Ti：0.014％，余量为Fe和不可避免的杂质。
前所述的一种TMCP态船舶VOC储罐用低温钢板，其化学成分及质量百分比如下：C：0.065％，Si：0.21％，Mn：1.60％，P:0.006％，S:0.0019％，Alt：0.055％，N：0.0037％，Ni≤0.40％，Nb:0.025％，Ti：0.011％，余量为Fe和不可避免的杂质。
前所述的一种TMCP态船舶VOC储罐用低温钢板，其化学成分及质量百分比如下：C：0.090％，Si：0.24％，Mn：1.35％，P:0.005％，S:0.0015％，Alt：0.035％，N：0.0038％，Ni≤0.40％，Nb:0.015％，Ti：0.018％，余量为Fe和不可避免的杂 质。
本发明提供一种TMCP态船舶VOC储罐用低温钢板制造方法，包括铁水脱硫预处理、转炉冶炼、LF精炼、RH真空处理、连铸、铸坯加热、控制轧制以及轧后控制冷却，
铸坯加热温度为1120～1150℃，坯料加热时间为25～45min；
控制轧制采用二阶段控制轧制，包括再结晶区轧制和未再结晶区轧制，粗轧轧制累积压下率≥50％，精轧轧制单道次压下率≥10％，终轧温度在760～820℃；
轧后采用ACC加速冷却，入水温度730～770℃，返红温度540～580℃；
钢板经加速冷却后，经预矫直机矫直1～5道，然后空冷至室温。
本发明的有益效果是：
(1)本发明采用TMCP工艺生产，工序成本明显低于传统正火和调质工艺生产的钢板；
(2)本发明采用二阶段控制轧制，轧后采用ACC控制冷却，组织为细化的铁素体+珠光体+少量低碳贝氏体，其中贝氏体含量≤10％，铁素体晶粒度为10.0～13.5级，钢板低温韧性优异，屈强比低，综合性能良好；
(3)本发明钢板低温韧性优异，经消应力热处理后，依然保持良好的强韧性匹配；
(4)本发明有利于简化工艺、降低成本，有利于批量生产。
附图说明
图1为实施例1的金相组织图。
具体实施方式
实施例1
本实施例提供的一种TMCP态船舶VOC储罐用低温钢板及制造方法，其化学成分及质量百分比如下：C：0.082％，Si：0.30％，Mn：1.52％，P:0.008％，S:0.0010％，Alt：0.058％，N：0.0033％，Ni≤0.40％，Nb:0.012％，Ti：0.014％，余量为Fe和不可避免的杂质。
其制造方法，包括铁水脱硫预处理、转炉冶炼、LF精炼、RH真空处理、连铸、铸坯加热、控制轧制以及轧后控制冷却：
铸坯加热温度为1130℃，坯料加热时间为25～45min；
控制轧制采用二阶段控制轧制，包括再结晶区轧制和未再结晶区轧制，粗轧轧制累积压下率≥50％，精轧轧制开轧温度876℃，单道次压下率≥10％，终轧温度在806℃；
轧后采用ACC加速冷却，入水温度753℃，返红温度550℃；
钢板经加速冷却后，经预矫直机矫直1～5道，然后空冷至室温。
实施例2
本实施例提供的一种TMCP态船舶VOC储罐用低温钢板及制造方法，其化学成分及质量百分比如下：C：0.065％，Si：0.21％，Mn：1.60％，P:0.006％，S:0.0019％，Alt：0.055％，N：0.0037％，Ni≤0.40％，Nb:0.025％，Ti：0.011％，余量为Fe和不可避免的杂质。
其制造方法，包括铁水脱硫预处理、转炉冶炼、LF精炼、RH真空处理、连铸、铸坯加热、控制轧制以及轧后控制冷却：
铸坯加热温度为1150℃，坯料加热时间为25～45min；
控制轧制采用二阶段控制轧制，包括再结晶区轧制和未再结晶区轧制，粗轧轧制累积压下率≥50％，精轧轧制开轧温度842℃，单道次压下率≥10％，终轧温度在815℃；
轧后采用ACC加速冷却，入水温度768℃，返红温度580℃；
钢板经加速冷却后，经预矫直机矫直1～5道，然后空冷至室温。
实施例3
本实施例提供的一种TMCP态船舶VOC储罐用低温钢板及制造方法，其化学成分及质量百分比如下：C：0.090％，Si：0.24％，Mn：1.35％，P:0.005％，S:0.0015％，Alt：0.035％，N：0.0038％，Ni≤0.40％，Nb:0.015％，Ti：0.018％，余量为Fe和不可避免的杂质。
其制造方法，包括铁水脱硫预处理、转炉冶炼、LF精炼、RH真空处理、连铸、铸坯加热、控制轧制以及轧后控制冷却：
铸坯加热温度为1120℃，坯料加热时间为25～45min；
控制轧制采用二阶段控制轧制，包括再结晶区轧制和未再结晶区轧制，粗轧轧制累积压下率≥50％，精轧轧制开轧温度847℃，单道次压下率≥10％，终轧温度在793℃；
轧后采用ACC加速冷却，入水温度759℃，返红温度540℃；
钢板经加速冷却后，经预矫直机矫直1～5道，然后空冷至室温。
实施例1～3所得钢板的力学性能如表1所示：
表1 VOC储罐用低温钢板的力学性能
Figure PCTCN2019093667-appb-000001
为消除钢板内应力，实施例1进行回火热处理，消应力处理后钢板的性能如表2所示：
表2 VOC储罐用低温钢板消应力处理工艺
Figure PCTCN2019093667-appb-000002
如图1所示，本发明所得钢板的组织为细化的铁素体+珠光体+少量低碳贝氏体，其中贝氏体含量≤10％，铁素体晶粒度为10.0～13.5级，钢板低温韧性优异，屈强比低，综合性能良好。
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。

Claims (5)

  1. 一种TMCP态船舶VOC储罐用低温钢板，其特征在于，其化学成分及质量百分比如下：C：0.04％～0.09％，Si：0.15％～0.50％，Mn：1.20％～1.60％，P≤0.010％，S≤0.002％，Alt：0.025％～0.070％，N≤0.0040％，Ni≤0.40％，Nb+V+Ti≤0.050％，余量为Fe和不可避免的杂质。
  2. 根据权利要求1所述的一种TMCP态船舶VOC储罐用低温钢板，其特征在于，其化学成分及质量百分比如下：C：0.082％，Si：0.30％，Mn：1.52％，P:0.008％，S:0.0010％，Alt：0.058％，N：0.0033％，Ni≤0.40％，Nb:0.012％，Ti：0.014％，余量为Fe和不可避免的杂质。
  3. 根据权利要求1所述的一种TMCP态船舶VOC储罐用低温钢板，其特征在于，其化学成分及质量百分比如下：C：0.065％，Si：0.21％，Mn：1.60％，P:0.006％，S:0.0019％，Alt：0.055％，N：0.0037％，Ni≤0.40％，Nb:0.025％，Ti：0.011％，余量为Fe和不可避免的杂质。
  4. 根据权利要求1所述的一种TMCP态船舶VOC储罐用低温钢板，其特征在于，其化学成分及质量百分比如下：C：0.090％，Si：0.24％，Mn：1.35％，P:0.005％，S:0.0015％，Alt：0.035％，N：0.0038％，Ni≤0.40％，Nb:0.015％，Ti：0.018％，余量为Fe和不可避免的杂质。
  5. 一种TMCP态船舶VOC储罐用低温钢板制造方法，其特征在于：包括铁水脱硫预处理、转炉冶炼、LF精炼、RH真空处理、连铸、铸坯加热、控制轧制以及轧后控制冷却，
    铸坯加热温度为1120～1150℃，坯料加热时间为25～45min；
    控制轧制采用二阶段控制轧制，包括再结晶区轧制和未再结晶区轧制，粗轧轧制累积压下率≥50％，精轧轧制单道次压下率≥10％，终轧温度在760～820℃；
    轧后采用ACC加速冷却，入水温度730～770℃，返红温度540～580℃；
    钢板经加速冷却后，经预矫直机矫直1～5道，然后空冷至室温。
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