WO2019105055A1 - 海洋工程用低温韧性s355g10+m宽厚钢板及其生产方法 - Google Patents

海洋工程用低温韧性s355g10+m宽厚钢板及其生产方法 Download PDF

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WO2019105055A1
WO2019105055A1 PCT/CN2018/098047 CN2018098047W WO2019105055A1 WO 2019105055 A1 WO2019105055 A1 WO 2019105055A1 CN 2018098047 W CN2018098047 W CN 2018098047W WO 2019105055 A1 WO2019105055 A1 WO 2019105055A1
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steel plate
low
rolling
temperature
thickness
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潘中德
吴俊平
霍松波
姜金星
高德平
张动
曹余良
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys 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
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing 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
    • C22C38/42—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
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—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
    • 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 a production process of a steel plate in the metallurgical field, in particular to a low temperature toughness S355G10+M wide and thick steel plate for marine engineering and a production process thereof.
  • Marine engineering steel is suitable for various complicated working conditions and harsh natural environment, and the service period is 50% higher than that of ordinary ship steel. Therefore, marine engineering steel is required to have high strength and high plasticity, good welding performance and seawater resistance. Corrosion performance should also have good toughness to ensure that steel and equipment can adapt to various loads and low temperature environments.
  • S355G10 series steel is a structural steel of the European Union EN10225 standard, which stipulates the chemical composition, mechanical properties and welding performance of offshore structural steel. At present, China has not formulated steel standards for marine engineering. Domestically, low carbon equivalents and microalloying are used. After the control, a reasonable heat treatment process (such as normalizing) is used to develop steel plates such as S355NL and S355J2, which can meet some offshore platforms and structures. Application of the piece.
  • Patent CN 102345055A discloses a weldable fine-grained structural steel S355NL/S355NLZ35 steel plate and a production method thereof, and the thickness of the steel plate can be produced within the range of 20-80 mm according to the method, and the performance indexes can meet the standard requirements after normalizing. However, this method is not suitable for the production of thick gauge steel plates of 80 mm or more.
  • Patent CN 104726769A discloses a S355G10+N steel plate for a large-thickness offshore platform and a production method thereof, wherein the composition design includes V 0.04-0.06%, steelmaking is carried out by ingot casting, subsequent rolling is a steel slab, and the rolled steel plate needs to be positive. Heat treatment by heat, complicated production process and high production cost.
  • the existing low temperature toughness S355G10 steel plate for marine engineering is microalloyed by adding Nb, V or Ni, and is mostly produced by normalizing heat treatment process. Some thick plates are rolled by using steel ingot as raw material, and the production process is complicated and the production cost is high.
  • the invention develops a low temperature toughness S355G10+M for marine engineering under the premise of continuous rolling billet rolling and low compression ratio under the condition of continuous casting billet rolling and low compression ratio, without using the normalizing heat treatment process.
  • Wide and thick steel plate, 80mm and 100mm thick S355G10+M steel plate meets EN10225 standard performance requirements, steel plate full thickness direction (near surface + thickness 1/2) -40°C impact toughness ⁇ 200Akv/J, 5% strain +250°C aging
  • the impact toughness is achieved to reach ⁇ 150Akv/J; in addition, the low carbon component design is adopted, because CEV ⁇ 0.39%, Pcm ⁇ 0.20%, the welding performance is more excellent.
  • the utility model relates to a low temperature toughness S355G10+M wide and thick steel plate for marine engineering, characterized in that the chemical composition of the steel plate is C 0.04-0.08%, Mn 1.30-1.60%, Si 0.10-0.30%, P ⁇ 0.015%, according to the weight percentage.
  • the impact toughness of the full thickness direction of the steel plate is -40 ° C ⁇ 200 Akv / J
  • the impact toughness of the 5% strain + 250 ° C aging is achieved ⁇ 150Akv / J
  • the thickness of the steel plate Z35 performance ⁇ 50%
  • tensile strength in the thickness direction ⁇ 490 MPa.
  • the steel sheet has a surface scale structure mainly composed of FeO+Fe3O4 having a thickness of less than 15 ⁇ m and a uniform density.
  • the above-mentioned method for producing a low-temperature toughness S355G10+M wide and thick steel plate for marine engineering is characterized in that a low carbon, Nb, Ti, Ni, and Cr compound composition is used, and a 320 mm large-section continuous casting billet is used, which is coarse under a low shrinkage ratio condition.
  • Rolling large reduction technology, TMCP process technology for production, production processes include:
  • Heating process the slab is heated in a heating furnace, the heating coefficient is ⁇ 10.0 min/cm, and the heating temperature is 1180-1220 °C to ensure the heating uniformity of the slab, especially the uniformity of the temperature at the thickness 1/2;
  • Cooling process The steel plate after rolling is rapidly cooled by an ultra-rapid cooling system, and the red return temperature is 560 ° C to 620 ° C; then, the stacking is slowly cooled, and the stacking time is 72 hours or more.
  • the invention adopts the composition design of low carbon, Nb, Ti, Ni and Cr compound addition, does not add V alloy (the V element contained is residual in the molten iron, non-added alloy), the raw material cost is low; the use of 320mm large section connection
  • the slab blank fully utilizes the rough rolling and large reduction technology under the condition of low shrinkage ratio, reasonably distributes the rolling pass and the pass reduction ratio, and the TMCP process technology produces the S355G10+M product with excellent low temperature toughness performance.
  • the EN10225 standard S355G10 is a steel plate specially designed for offshore structures. The market demand is large and the economic benefits are good. It is estimated that the gross profit per ton of steel is more than 1000 yuan/ton.
  • Figure 1 shows the microstructure of the 80 mm thick S355G10+M steel plate at a thickness of 1/2.
  • Figure 2 shows the microstructure at a thickness of 1/2 of a 100 mm thick S355G10+M steel plate.
  • the low temperature toughness S355G10+M wide and thick steel plate for marine engineering of the present invention adopts the following distribution ratio and production method:
  • the maximum thickness of the steel plate produced by the invention is 100mm, the steel plate grade is S355G10+M, and the quality meets the S355G7+M, S355G8+M, S355G9+M series grades at the same time.
  • the thickness of the S355G10+M steel plate is 80 mm, and the following distribution ratio and production method are employed.
  • the ingredient content (wt) is:
  • the production method of the steel plate is as follows:
  • the heating process is: the heating coefficient of the steel billet is 10.5 min/cm, the heating temperature is 1199 ° C, and the soaking time of the soaking section is 62 min.
  • Cooling process The rolled steel plate is cooled on-line in an ultra-rapid cooling device, and the reddening temperature is 608 ° C; after rolling, the stacking is slowly cooled, the stacking temperature is 580 ° C, and the stacking time is 78 hours. When the steel is removed, the temperature is detected at 37 °C.
  • the S355G10+M steel billet is rolled into an 80mm steel plate, and the photomicrograph of the thickness of 1/2 is shown in Fig. 1.
  • the steel sheet is uniform and fine, the grain size of the microstructure is 9.0, and the tissue type is: ferrite + pearlite. And a small amount of bainite, banded tissue grade 0.5.
  • the mechanical properties are: yield strength 431 MPa, tensile strength 527 MPa, flexion ratio 82%, -40 °C impact energy Akv at various positions along the thickness direction (upper surface, 1/4T, 1/2T, 3/4T and lower surface, T Indicates thickness): 254, 222, 205, 299, 245J, 5% strain + 250 ° C after aging - 40 ° C impact work: 263 J, Z direction: 77, 76, 73%.
  • the thickness of the S355G10+M steel plate is 100 mm, and the following distribution ratio and production method are employed.
  • the content of ingredients is (wt):
  • the production method of the steel plate is as follows:
  • Heating process is as follows: the heating coefficient of the steel slab is 11 min/cm, the highest heating temperature is 1207 ° C, and the soaking time of the soaking section is 58 min.
  • the S355G10+M steel plate is rolled into a 100mm steel plate, and the photomicrograph of the thickness of 1/2 is shown in Fig. 2.
  • the steel plate is uniform and fine, the grain size of the microstructure is 9.5, and the tissue type is: ferrite + pearlite. And a small amount of bainite, banded tissue grade 1.0.
  • the mechanical properties are: yield strength 402MPa, tensile strength 516MPa, yield ratio 78%, -40°C impact energy Akv at various positions along the thickness direction (upper surface, 1/4T, 1/2T, 3/4T and lower surface, T Indicates thickness): 271, 204, 206, 283, 204J, 5% strain + 250 °C After aging, -40 °C impact work: 171 J, Z direction: 75, 75, 75%.

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Abstract

一种海洋工程用低温韧性S255G10+M宽厚钢板，其化学成分质量百分比为：C 0.04-0.08%，Mn 1.30-1.60%，Si 0.10-0.30%，P ≤0.015%，S ≤0.003%，Nb0.010-0.030%，V ≤0.01%，Ti 0.010-0.020%，Alt 0.020-0.055%，Cr ≤0.20%，Ni 0.10-0.50%，Mo ≤0.05%，Cu ≤0.30%，N ≤0.006%，B ≤0.0005%, As ≤0.03%，Sb≤0.010%，Sn≤0.020%，Pb ≤0.010%，Bi ≤0.010%，CEV ≤0.39%，Pcm ≤0.20%，其余部分为Fe和杂质。该钢板不添加V合金，原料成本低；使用320mm大断面连铸坯，在低圧缩比条件下充分发挥粗轧大压下技术，合理分配轧制道次和道次压下率，TMCP工艺技术生产出低温韧性性能优良的S355G10+M产品，轧后钢板不需要后续正火等热处理，工序成本低。

Description

海洋工程用低温韧性S355G10+M宽厚钢板及其生产方法 技术领域
本发明涉及冶金领域一种钢板的生产工艺，具体的说是一种海洋工程用低温韧性S355G10+M宽厚钢板及其生产工艺。
背景技术
海洋工程用钢适用于各种复杂工况条件和恶劣自然环境，且服役周期较普通船舶用钢高50％，因此要求海洋工程用钢不但具有高强度和高塑性，良好的焊接性能及耐海水侵蚀性能，还应具备良好的韧性，以保证钢材和设备能适应各种载荷和低温环境。
S355G10系列钢属欧盟EN10225标准的结构钢，规定了海上结构钢的化学成分、力学性能、焊接性能等。目前我国尚未制定海洋工程用钢标准，国内多采用低碳当量、微合金化，控扎后选择合理的热处理工艺(如正火)开发出S355NL和S355J2等钢板，均能满足部分海上平台及结构件的应用。
专利CN 102345055A公开了一种可焊接细晶粒结构钢S355NL/S355NLZ35钢板及其生产方法，按照其方法可生产钢板的厚度在20-80mm内，正火后各项性能指标均能达到标准要求，但该方法不适用于80mm以上厚规格钢板的生产。
专利CN 104726769A公开了大厚度海洋平台用S355G10+N钢板及其生产方法，其成分设计中包含V 0.04-0.06％，炼钢采用锭模浇注、后续轧制为钢坯，且轧制钢板需进行正火热处理，生产工序复杂，生产成本高。
发明内容
现有的海洋工程用低温韧性S355G10钢板，添加Nb、V或Ni进行微合金化，多采用正火热处理工艺生产，部分厚板采用钢锭作为原材料进行轧制，生产工序复杂，生产成本高。
本发明通过专有成分设计，在连铸坯轧制、低压缩比条件下，采用控轧控冷技术，不采用正火热处理工艺的前提下，开发出一种海洋工程用低温韧性S355G10+M宽厚钢板，保证80mm和100mm厚S355G10+M钢板达到EN10225标准性能要求，钢板全厚度方向(近表面+厚度1/2处)-40℃冲击韧性≥200Akv/J，5％应变+250℃时效后其冲击韧性均实现达到≥150Akv/J；另外采用低碳成分设计，因CEV≤0.39％，Pcm≤0.20％，焊接性能更加优异。
本发明具体采用以下技术方案：
一种海洋工程用低温韧性S355G10+M宽厚钢板，其特征在于，钢板的化学成分按重量百分比计为：C 0.04-0.08％，Mn 1.30-1.60％，Si 0.10-0.30％，P≤0.015％，S≤0.003％，Nb0.010-0.030％，V≤0.01％，Ti 0.010-0.020％，Alt 0.020-0.055％，Cr≤0.20％，Ni 0.10-0.50％，Mo≤0.05％，Cu≤0.30％，N≤0.006％，B≤0.0005％,As≤0.03％，Sb≤0.010％，Sn≤0.020％，Pb≤0.010％，Bi≤0.010％，CEV≤0.39％，Pcm≤0.20％，其余部分为Fe和杂质。
优选地，钢板全厚度方向-40℃冲击韧性≥200Akv/J，5％应变+250℃时效后其冲击韧性均实现达到≥150Akv/J，钢板厚度方向Z35性能≥50％，厚度方向拉伸强度≥490MPa。
优选地，钢板具有厚度小于15μm，且致密均匀的以FeO+Fe3O4为主的表面氧化皮结构。
上述海洋工程用低温韧性S355G10+M宽厚钢板的生产方法，其特征在于采用低碳、Nb、Ti、Ni、Cr复合添加的成分设计，使用320mm大断面连铸坯，采用低圧缩比条件下粗轧大压下技术、TMCP工艺技术进行生产，生产工序包括：
(1)、炼钢工序：铁水预处理脱S、转炉深脱P、LF深脱S，超低As、Sb、Sn、Pb、Bi、B残余元素控制；采用动态轻压下、电磁搅拌技术，获得中心偏析C0.5、C1.0级的S355G系列海工钢铸坯；
(2)、加热工序：铸坯入加热炉加热，加热系数≥10.0min/cm，加热温度1180-1220℃，保证铸坯加热均匀性，特别是厚度1/2处温度的均匀性；
(3)、轧制工序：采用320mm大断面连铸坯，在低圧缩比条件下，采用2阶段控轧工艺，第一阶段轧制温度在980～1150℃之间，合理分配轧制道次和道次压下率，采用粗轧最后2道次压下量≥35mm、压下率≥20％的粗轧大压下技术；第二阶段的开轧温度≤840℃，获得80、100mm厚度S355G钢；
(4)、冷却工序：轧制后的钢板入超快冷系统进行快速冷却，返红温度560℃～620℃；然后进行堆垛缓冷，堆垛时间72小时及以上。
采用上述技术方案所产生的有益效果在于：
本发明采用低碳、Nb、Ti、Ni、Cr复合添加的成分设计，不添加V合金(所含V元素是铁水中残余下来的，非添加的合金)，原料成本低；使用320mm大断面连铸坯，在低圧缩比条件下充分发挥粗轧大压下技术，合理分配轧制道次和道次压下率，TMCP工艺技术生产出低温韧性性能优良的S355G10+M产品，轧后钢板不需要后续正火等热处理，工序成本低；钢板及试样PWHT(580±20℃、保温4小时，模拟焊后热处理)后检验，钢板全厚度方向(近表面+厚度1/2处)-40℃冲击韧性≥200Akv/J，5％应变+250℃时效后其冲击韧性≥150Akv/J 的优异低温韧性，钢板厚度方向Z35性能≥50％，厚度方向拉伸强度≥490MPa，综合力学性能指标达到国外同类水平，适用于深海远洋开发或者海洋风塔用钢等海洋工程用大厚度钢板。
在全流程表面氧化皮演变研究基础上，通过优化加热、轧制、冷却工艺技术，获得了厚度小于15μm，且致密均匀的以FeO+Fe3O4为主的表面氧化皮结构，较传统海洋用钢(如S355NL)耐蚀性提高15％以上。
随着对海洋资源的开发不断向深海迈进，对海洋工程用钢的需求量不断扩大，目前仅海洋风塔用钢年需求量达到300吨以上。而EN10225标准S355G10为专为海上结构设计的钢板，市场需求量很大，经济效益好，预计吨钢毛利1000元/吨以上。
附图说明
图1为80mm厚S355G10+M钢板厚度1/2处显微组织。
图2为100mm厚S355G10+M钢板厚度1/2处显微组织。
具体实施方式
本发明海洋工程用低温韧性S355G10+M宽厚钢板采用下述成分配比以及生产方法:
C 0.04-0.08％，Mn 1.30-1.60％，Si 0.10-0.30％，P≤0.015％，S≤0.003％，Nb0.010-0.030％，V≤0.01％，Ti 0.010-0.020％，Alt 0.020-0.055％，Cr≤0.20％，Ni 0.10-0.50％，Mo≤0.05％，Cu≤0.30％，N≤0.006％，B≤0.0005％,As≤0.03％，Sb≤0.010％，Sn≤0.020％，Pb≤0.010％，Bi≤0.010％，CEV≤0.39％，Pcm≤0.20％，其余部分为Fe和杂质，生产钢板厚度为80mm和100mm。
本发明生产钢板最大厚度为100mm，钢板牌号S355G10+M，质量同时满足S355G7+M、S355G8+M、S355G9+M系列牌号。
实施例1:
此S355G10+M钢板厚度为80mm，采用下述成分配比以及生产方法。成分含量(wt)为:
C 0.048％、Mn 1.47％、P 0.011％、S 0.001％、Si 0.23％、Alt 0.03％、Nb 0.022％、V 0.003％、Ti 0.014％、Ni 0.44％、Cr 0.13％、Cu 0.01％、Mo 0.004％、N 0.0033％、CEV 0.362％、Pcm 0.16％、Pb 0.001％、Sb 0.001％、Sn 0.001％、As 0.004％、B 0.0004％，其余为Fe和杂质。
本钢板的生产方法如下:
(1)、炼钢工序：铁水预处理后S≤0.005％，转炉深脱P≤0.010％，LF深脱硫后S≤0.002％,超低As、Sb、Sn、Pb、Bi、B残余元素控制，冶炼采用成分合格铁水作为原材料，钢水冶炼过程添加合金避免残余元素增加。RH结束后钢液温度1548℃，至连铸中间包，钢液过热度控制在11-17℃,连铸采用动态轻压下、电磁搅拌技术，320mm厚铸坯中心偏析C0.5级。
(2)、加热工序：加热工艺为：钢坯的加热系数10.5min/cm，加热温度1199℃，均热段保温时间62min。
(3)、轧制工序：采用2阶段控轧工艺，第一阶段轧制终了温度1008℃，此阶段最后2道次压下量为38、38mm，道次压下率为24、21％；第二阶段开轧温度为828℃，终轧温度为805℃。
(4)、冷却工艺：经轧制后的钢板在超快速冷却装置进行在线冷却，返红温度为608℃；轧后及时堆垛缓冷，堆垛温度580℃，堆垛时间78小时。拆垛钢温37℃时探伤。
本S355G10+M钢坯轧成80mm钢板，其厚度1/2处显微组织照片如图1所示，钢板组织均匀细小，组织晶粒度在9.0级，组织类型为：铁素体+珠光体，以及少量的贝氏体，带状组织等级0.5级。力学性能为：屈服强度431MPa，抗拉强度527MPa，屈强比82％，-40℃沿厚度方向各位置冲击功Akv(上表面、1/4T、1/2T、3/4T和下表面,T表示厚度)：254、222、205、299、245J，5％应变+250℃时效后-40℃冲击功：263J，Z向:77、76、73％。
实施例2:
本S355G10+M钢板厚度为100mm，采用下述成分配比以及生产方法。成分含量为(wt):
C 0.06％、Mn 1.50％、P 0.013％、S 0.001％、Si 0.24％、Alt 0.035％、Nb 0.023％、V 0.003％、Ti 0.016％、Ni 0.47％、Cr 0.13％、Cu 0.01％、Mo 0.004％、N 0.0033％、CEV 0.36％、Pcm 0.15％、Pb 0.001％、Sb 0.001％、Sn 0.002％、As 0.004％、B 0.0004％，其余为Fe和杂质。
本钢板的生产方法如下:
(1)、炼钢工序：铁水预处理后S≤0.005％，转炉深脱P≤0.010％，LF深脱硫后S≤0.002％,超低As、Sb、Sn、Pb、Bi、B残余元素控制，冶炼采用成分合格铁水作为原材料，钢水冶炼过程添加合金避免残余元素增加。RH结束后钢液温度1543℃，至连铸中间包，钢液过热度控制在9-15℃,连铸采用动态轻压下、电磁搅拌技术，320mm厚铸坯中心偏析C0.5级。
(2)、加热工序：加热工艺为：其钢坯的加热系数11min/cm，最高加热温度1207℃，均热段保温时间58min。
(3)、轧制工序：采用320mm大断面连铸坯，在低圧缩比条件下，采用2阶段控轧工艺，第一阶段轧制终了温度998℃，此阶段最后2道次压下量为41、41mm，道次压下率22、20％；第二 阶段开轧温度为819℃，终轧温度为807℃。
(4)、水冷工序：经轧制后的钢板在超快速冷却装置进行在线冷却，返红温度为591℃；轧后及时堆垛缓冷，堆垛温度580℃，堆垛时间74小时。拆垛钢温48℃时探伤。
本S355G10+M钢板轧成100mm钢板，其厚度1/2处显微组织照片如图2所示，钢板组织均匀细小，组织晶粒度在9.5级，组织类型为:铁素体+珠光体，以及少量的贝氏体，带状组织等级1.0级。力学性能为：屈服强度402MPa，抗拉强度516MPa，屈强比78％，-40℃沿厚度方向各位置冲击功Akv(上表面、1/4T、1/2T、3/4T和下表面,T表示厚度)：271、204、206、283、204J，5％应变+250℃时效后-40℃冲击功：171J，Z向:75、75、75％。

Claims (4)

  1. 一种海洋工程用低温韧性S355G10+M宽厚钢板，其特征在于，钢板的化学成分按重量百分比计为：C 0.04-0.08％，Mn 1.30-1.60％，Si 0.10-0.30％，P≤0.015％，S≤0.003％，Nb 0.010-0.030％，V≤0.01％，Ti 0.010-0.020％，Alt 0.020-0.055％，Cr≤0.20％，Ni0.10-0.50％，Mo≤0.05％，Cu≤0.30％，N≤0.006％，B≤0.0005％,As≤0.03％，Sb≤0.010％，Sn≤0.020％，Pb≤0.010％，Bi≤0.010％，CEV≤0.39％，Pcm≤0.20％，其余部分为Fe和杂质。
  2. 如权利要求1所述的海洋工程用低温韧性S355G10+M宽厚钢板，其特征在于钢板全厚度方向-40℃冲击韧性≥200Akv/J，5％应变+250℃时效后冲击韧性≥150Akv/J，钢板厚度方向Z35性能≥50％，厚度方向拉伸强度≥490MPa。
  3. 如权利要求1所述的海洋工程用低温韧性S355G10+M宽厚钢板，其特征在于具有厚度小于15μm，且致密均匀的以FeO+Fe3O4为主的表面氧化皮结构。
  4. 如权利要求1-3任一所述的海洋工程用低温韧性S355G10+M宽厚钢板的生产方法，其特征在于采用低碳、Nb、Ti、Ni、Cr复合添加的成分设计，使用320mm大断面连铸坯，采用低圧缩比条件下粗轧大压下技术、TMCP工艺技术进行生产，生产工序包括：
    (1)、炼钢工序：铁水预处理脱S、转炉深脱P、LF深脱S，超低As、Sb、Sn、Pb、Bi、B残余元素控制；采用动态轻压下、电磁搅拌技术，获得中心偏析C0.5、C1.0级的S355G系列海工钢铸坯；
    (2)、加热工序：铸坯入加热炉加热，加热系数≥10.0min/cm，加热温度1180-1220℃，保证铸坯加热均匀性，特别是厚度1/2处温度的均匀性；
    (3)、轧制工序：采用320mm大断面连铸坯，在低圧缩比条件下，采用2阶段控轧工艺，第一阶段轧制温度在980～1150℃之间，合理分配轧制道次和道次压下率，采用粗轧最后2道次压下量≥35mm、压下率≥20％的粗轧大压下技术；第二阶段的开轧温度≤840℃，获得80、100mm厚度S355G钢；
    (4)、冷却工序：轧制后的钢板入超快冷系统进行快速冷却，返红温度560℃～620℃；然后进行堆垛缓冷，堆垛时间72小时及以上。
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