WO2022033128A1 - Normalized-condition delivered 100-120mm thick fh36 steel plate for offshore wind power pipe piles and preparation method therefor - Google Patents
Normalized-condition delivered 100-120mm thick fh36 steel plate for offshore wind power pipe piles and preparation method therefor Download PDFInfo
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- WO2022033128A1 WO2022033128A1 PCT/CN2021/097058 CN2021097058W WO2022033128A1 WO 2022033128 A1 WO2022033128 A1 WO 2022033128A1 CN 2021097058 W CN2021097058 W CN 2021097058W WO 2022033128 A1 WO2022033128 A1 WO 2022033128A1
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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
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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- 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
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- 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
- C21D8/0242—Flattening; Dressing; Flexing
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- 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
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- 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
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
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- 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
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- 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
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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
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- 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
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- 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
- High-strength and high-quality steel plates such as FH36 are used as pipe piles for offshore wind turbines, which need to be rolled and welded, and can carry wind turbines with a single pile exceeding 1,000 tons.
- FH36 steel produced in China is mainly used in LPG and LEG ships, and the thickness specification is generally less than 40mm.
- the FH36 steel with a thickness of more than 100mm there is little development in China.
- offshore engineering companies still mainly import FH36 steel plates with extra-thick specifications for use in offshore wind power pipe piles.
- CEV(%) C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 (1).
- the chemical composition of the steel sheet is C: 0.13%, Si: 0.25%, Mn: 1.50%, P: ⁇ 0.0060%, S: ⁇ 0.0020%, Nb: 0.045%, Al: 0.035%, Ti: 0.015%, Ni: 0.65%, Cr: 0.15%, Cu: 0.25%, Ca: 0.0015%, CEV: 0.47%, and the balance is Fe and inevitable impurity elements.
- Si is mainly used for deoxidation.
- the addition amount should be determined according to different smelting methods, it must be more than 0.15% to obtain good performance of the steel plate, but if it exceeds 0.50%, it will cause segregation in the core and damage the welding performance. Therefore, the upper limit is set to 0.50%.
- Mn has the effect of delaying the transformation of austenite to ferrite in the steel, which is beneficial for refining ferrite and improving strength and toughness.
- the content of manganese is low, the above effects are not significant, and the strength and toughness of the steel plate are low. If it is too high, it will cause segregation of the continuous casting billet, poor toughness and reduced weldability.
- the upper limit of manganese content is required by the classification society specification to be 1.60%, etc. Therefore, in the present invention, considering the comprehensive addition of alloys, the addition amount of manganese content is specified in the range of in the range of 1.20 to 1.60%.
- Nb is added in the composition design, the non-recrystallization temperature can be increased by Nb, and the lower limit temperature of finishing rolling and rolling temperature can be increased to 860 °C.
- High temperature is beneficial to reduce rolling passes and shorten the time between rough rolling and finishing rolling temperature, and the effective precipitation of Nb in the process of cooling after rolling and air cooling after normalizing, pinning the triangular grain boundary, grain boundary and intragranular of ferrite grains to limit the rapid growth of ferrite and refine iron Body tissue.
- composition control of carbon equivalent CEV ⁇ 0.49% increases the difficulty of rolling, it ensures the weldability of the steel plate, so that even if the impact temperature of the welded joint is as low as -60°C, it still meets the weldability requirements of the classification society.
- Fig. 2 is the metallographic structure at 1/2 thickness of steel plate in Example 1 of the present invention.
- step (5) Normalizing: the steel plate obtained in step (5) is sent to a continuous furnace, the normalizing temperature is 880-920° C., and the time from the steel plate entering the furnace to being released is 1.6-2.2 min/mm.
- FIGS 1 and 2 show typical microstructure photographs of the examples.
- the microstructure of the finished steel plate is a mixed structure of pro-eutectic ferrite + iron-like ferrite, and the ferrite grain size is between 6-15um; the structure at 1/2 thickness of the steel plate is pro-eutectic ferrite + iron-like A mixed structure of ferrite, and a small amount of banded pearlite.
- the pearlite structure is caused by the central segregation in the continuous casting process. It can be seen that normalizing heat treatment through reasonable composition design, such a large thickness of the steel plate, excellent structure control, the grain is not coarsened in the air cooling after normalizing. While meeting the high strength of the steel plate, it also ensures the low temperature impact toughness of the steel plate at -60°C.
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Abstract
The present invention relates to a normalized-condition delivered 100-120mm thick FH36 steel plate for offshore wind power pipe piles. The steel plate comprises the following chemical components based on National Standard GB712 and classification society rule, in percentages by weight: 0.11-0.13% of C, 0.15-0.50% of Si, 1.20-1.60% of Mn, P ≤0.0070%, S ≤0.0030%, 0.030-0.060% of Nb, 0.020-0.050% of Al, 0.008-0.030% of Ti, 0.40-0.80% of Ni, 0.10-0.20% of Cr, 0.10-0.35% of Cu, 0.0005-0050% of Ca, and the balance being Fe. The carbon equivalent CEV is ≤0.49%, the matrix structure is composed of a proeutectoid ferrite + acicular ferrite, and the average grain size is 6-15μm. Due to the center segregation of a continuous cast blank, a small amount of strip pearlites are possibly generated in the center portion of the steel plate. The preparation process of the steel plate comprises: converter -> LF refining -> RH vacuum degassing -> Ca treatment -> continuous casting -> cast blank dehydrogenation treatment -> heating -> rolling -> normalizing.
Description
本发明属于合金钢铁冶金领域，具体涉及一种正火态交货的特厚海上风电管桩用FH36钢板及其生产方法。The invention belongs to the field of alloy steel metallurgy, and in particular relates to an FH36 steel plate for extra-thick offshore wind power pipe piles delivered in a normalized state and a production method thereof.
海上风电异军突起，装机规模连年快速增长，尤其在我国江苏、福建、广东、山东等多个省份的海岸线。海上风电产业的发展带动了海上风机及其配套材料的技术迅速发展，风机安装从近海逐渐向浅海、向寒冷地带延伸，目前，处于中国最北的海上风机已安装到辽宁大连庄河，风机也向着更大容量发展，海上风电用钢也从常用的DH36钢向高质量等级的EH36、及更高质量等级的FH36钢发展，厚度规格也从35-80mm向更大厚度发展，目前，厚度规格已拓展到110mm。Offshore wind power is on the rise, and the installed capacity has grown rapidly year after year, especially in the coastlines of Jiangsu, Fujian, Guangdong, Shandong and other provinces in my country. The development of the offshore wind power industry has led to the rapid development of the technology of offshore wind turbines and their supporting materials. The installation of wind turbines has gradually extended from offshore to shallow seas and to cold regions. At present, the offshore wind turbine in the northernmost part of China has been installed in Zhuanghe, Dalian, Liaoning Province. Towards the development of larger capacity, the steel for offshore wind power has also developed from the commonly used DH36 steel to the high-quality EH36 and higher-quality FH36 steel, and the thickness specification has also developed from 35-80mm to a larger thickness. At present, the thickness specification Has been extended to 110mm.
高强度高质量等级的如FH36钢板因其应用为海上风机的管桩，需要卷制、焊接，承载单桩超1000吨以上的风机，使用潮汐、日照、极寒恶劣环境下，除需具备高强度外、还需具备良好的低温韧性、应变时效性能、焊接性能、耐腐蚀性、抗层状撕裂性等综合性能。国内生产的FH36钢主要应用在LPG、LEG船上，厚度规格一般在40mm以内，对于100mm以上厚度规格的FH36钢，国内还鲜有开发。考虑到海上风机运行的安全性，海工企业对于应用于海上风电管桩的特厚规格FH36钢板目前仍以国外进口为主。High-strength and high-quality steel plates such as FH36 are used as pipe piles for offshore wind turbines, which need to be rolled and welded, and can carry wind turbines with a single pile exceeding 1,000 tons. When used in tidal, sunshine, and extremely cold harsh environments, in addition to having high In addition to strength, it also needs to have good low temperature toughness, strain aging performance, welding performance, corrosion resistance, laminar tear resistance and other comprehensive properties. The FH36 steel produced in China is mainly used in LPG and LEG ships, and the thickness specification is generally less than 40mm. For the FH36 steel with a thickness of more than 100mm, there is little development in China. Considering the safety of the operation of offshore wind turbines, offshore engineering companies still mainly import FH36 steel plates with extra-thick specifications for use in offshore wind power pipe piles.
针对高标准的正火态交货的FH36海洋工程用钢板，国内生产技术储备不足，本案发明人检索到的专利文献仅涉及FH36钢应用于LPG、LEG船上，厚度在40mm以下，尚未有公开针对海上风电管桩应用的特厚FH36钢板的生产介绍。In view of the high standard of FH36 steel plate for marine engineering delivered in normalized state, the domestic production technology reserve is insufficient. The patent documents retrieved by the inventor of this case only involve the application of FH36 steel to LPG and LEG ships, and the thickness is below 40mm. Production introduction of extra-thick FH36 steel plate for offshore wind power pipe pile application.
发明内容SUMMARY OF THE INVENTION
本发明的目的是提供一种正火态交货的100～120mm特厚FH36钢板及其生产方法，该钢板是基于GB712和九国船级社的成分体系，钢板能够满足海上风电管桩的高强度、高冲击韧性、易卷制、易焊接的高标准要求。The purpose of the present invention is to provide a 100-120mm extra-thick FH36 steel plate delivered in a normalized state and a production method thereof, the steel plate is based on the composition system of GB712 and the Kyukoku Classification Society, and the steel plate can meet the high requirements of offshore wind power pipe piles. High standard requirements for strength, high impact toughness, easy rolling and easy welding.
本发明的技术方案为：一种正火态交货的100～120mm厚海上风电管桩用FH36钢板，钢板的化学成分是基于国家标准GB712和船级社规范，利用Al、Nb、Ti晶粒细化元素，并添加Cr、Ni、Cu等合金元素，以达到提高钢板强度及韧性，控制P、S、O、N、H的含量，提升材料的洁净度。化学成分按重量百分比计为：C：0.11～0.13％，Si：0.15～0.50％，Mn：1.20～1.60％，P：≤0.0070％，S：≤0.0030％，Nb：0.030～0.060％，Al：0.020～0.050％，Ti：0.008～0.030％，Ni：0.40～0.80％，Cr：0.10～0.20％，Cu：0.10～0.35％，Ca:0.0005～0050％，余量为Fe及不可避免的杂质元素。The technical scheme of the present invention is: a 100-120mm thick FH36 steel plate for offshore wind power pipe piles delivered in a normalized state. Refine the elements, and add alloying elements such as Cr, Ni, and Cu to improve the strength and toughness of the steel plate, control the content of P, S, O, N, and H, and improve the cleanliness of the material. Chemical composition by weight percentage: C: 0.11-0.13%, Si: 0.15-0.50%, Mn: 1.20-1.60%, P: ≤ 0.0070%, S: ≤ 0.0030%, Nb: 0.030-0.060%, Al: 0.020-0.050%, Ti: 0.008-0.030%, Ni: 0.40-0.80%, Cr: 0.10-0.20%, Cu: 0.10-0.35%, Ca: 0.0005-0050%, the balance is Fe and inevitable impurity elements .
钢板的碳当量CEV≤0.49％，其中碳当量CEV由熔炼分析成分采用公式(1)计算The carbon equivalent CEV of the steel plate is less than or equal to 0.49%, wherein the carbon equivalent CEV is calculated from the smelting analysis components using formula (1)
CEV(％)＝C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 (1)。CEV(%)=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 (1).
优选地，钢板的化学成分按重量百分比为C：0.13％，Si：0.25％，Mn：1.50％，P：≤0.0060％，S：≤0.0020％，Nb：0.045％，Al：0.035％，Ti：0.015％，Ni：0.65％，Cr：0.15％，Cu：0.25％，Ca:0.0015％，CEV：0.47％，余量为Fe及不可避免的杂质元素。Preferably, the chemical composition of the steel sheet is C: 0.13%, Si: 0.25%, Mn: 1.50%, P: ≤ 0.0060%, S: ≤ 0.0020%, Nb: 0.045%, Al: 0.035%, Ti: 0.015%, Ni: 0.65%, Cr: 0.15%, Cu: 0.25%, Ca: 0.0015%, CEV: 0.47%, and the balance is Fe and inevitable impurity elements.
本发明钢板元素成分中各元素的设计原理如下：The design principle of each element in the element composition of the steel plate of the present invention is as follows:
C的加入可以增加钢的淬透性，特别是中厚板生产，可以显著提高正火钢的强度，但是C含量过多不利于钢的低温冲击性能、低温应变时效性能、焊接性能以及耐蚀性能，所以本发明中碳含量控制为低碳控制，介于0.11～0.13％。The addition of C can increase the hardenability of steel, especially in the production of medium and heavy plates, and can significantly improve the strength of normalized steel, but too much C content is not conducive to the low-temperature impact performance, low-temperature strain aging performance, weldability and corrosion resistance of steel. Therefore, in the present invention, the carbon content is controlled to be low carbon, ranging from 0.11 to 0.13%.
Si主要用于脱氧，虽要依据不同的冶炼方式来确定其加入量，但要获得良好的钢板性能，必须在0.15％以上，但若超过0.50％以上又会造成心部偏析以及破坏焊接性能，所以规定其上限为0.50％。Si is mainly used for deoxidation. Although the addition amount should be determined according to different smelting methods, it must be more than 0.15% to obtain good performance of the steel plate, but if it exceeds 0.50%, it will cause segregation in the core and damage the welding performance. Therefore, the upper limit is set to 0.50%.
Mn在所述钢中具有推迟奥氏体向铁素体转变的作用，对细化铁素体，提高强度和韧性有利。当锰的含量较低，上述作用不显著，钢板强度和韧性偏低等。过高则又会引起连铸坯偏析、韧性差和可焊性降低，同时船级社规范要求锰含量上限为1.60％等，故本发明中考虑到合金的综合加入，规定锰含量加入量介于1.20～1.60％的范围内。Mn has the effect of delaying the transformation of austenite to ferrite in the steel, which is beneficial for refining ferrite and improving strength and toughness. When the content of manganese is low, the above effects are not significant, and the strength and toughness of the steel plate are low. If it is too high, it will cause segregation of the continuous casting billet, poor toughness and reduced weldability. At the same time, the upper limit of manganese content is required by the classification society specification to be 1.60%, etc. Therefore, in the present invention, considering the comprehensive addition of alloys, the addition amount of manganese content is specified in the range of in the range of 1.20 to 1.60%.
Nb的溶质拖曳作用和Nb(C,N)对奥氏体晶界的钉扎作用，均抑制形变奥氏体的再结晶，扩大奥氏体非再结晶区间，减少特厚板生产待温时间。并在冷却时形成析出物，从而使强度和韧性均得到提高，还可以提高钢的耐蚀性能，一定量的Nb含量配合其它成分设计可以形成针状铁素体，达到改善钢组织的目的。添加量小于0.030％时效果不明显，大于0.060％时韧性降低，导致连铸坯产生表面裂纹。因此，本发明规定铌含量应介于0.030～0.060％的范围内。The solute dragging effect of Nb and the pinning effect of Nb(C,N) on austenite grain boundaries both inhibit the recrystallization of deformed austenite, expand the non-recrystallization range of austenite, and reduce the waiting time for extra-thick plate production. . Precipitates are formed during cooling, so that the strength and toughness are improved, and the corrosion resistance of the steel can also be improved. A certain amount of Nb content and other components can be designed to form acicular ferrite to achieve the purpose of improving the steel structure. When the addition amount is less than 0.030%, the effect is not obvious, and when it is more than 0.060%, the toughness decreases, resulting in surface cracks in the continuous casting slab. Therefore, the present invention stipulates that the niobium content should be in the range of 0.030-0.060%.
Al是炼钢过程中一个重要的脱氧元素，在钢中加入微量的Al，也可以有效的减少钢中的夹杂物含量，细化晶粒。但过多的Al，会促进连铸坯产生表面裂纹，产生内部铝系夹杂物，降低板坯质量，因此，全Al含量应控制在0.020～0.050％。Al is an important deoxidizing element in the steelmaking process. Adding a small amount of Al to the steel can also effectively reduce the inclusion content in the steel and refine the grains. However, too much Al will promote the continuous casting slab to produce surface cracks, generate internal aluminum inclusions, and reduce the quality of the slab. Therefore, the total Al content should be controlled at 0.020-0.050%.
Ca：微量Ca处理是本发明钢种的必要处理环节。0.0005～0.0050％的Ca不仅可以降低硫化物带来的性能危害，还可以是尖锐的Al
2O
3夹杂变性为球性低熔点夹杂，从而减少钢板轧制过程中硬质夹杂物尖角处微裂纹的产生，提高钢板冲击韧性。
Ca: Trace Ca treatment is a necessary treatment link for the steel grade of the present invention. 0.0005-0.0050% Ca can not only reduce the performance hazards caused by sulfides, but also can transform sharp Al 2 O 3 inclusions into spherical low-melting inclusions, thereby reducing the amount of microscopic hard inclusions at the sharp corners of the steel plate during rolling. The generation of cracks improves the impact toughness of the steel plate.
Ni是提高钢淬透性的元素，也是有效提高钢的低温韧性的最常用元素。此外，与钢中残余Cr、P复合作用，将有助于提高钢的耐腐蚀性，但是船级社规范规定上限0.80％，为了不超出船级社规范规定。故在本发明中，规定镍含量介于0.40～0.80％。Ni is an element that improves the hardenability of steel, and is also the most commonly used element to effectively improve the low-temperature toughness of steel. In addition, compounding with the residual Cr and P in the steel will help to improve the corrosion resistance of the steel, but the upper limit of the classification society regulations is 0.80%, in order not to exceed the classification society regulations. Therefore, in the present invention, the nickel content is specified to be between 0.40% and 0.80%.
Cr、Cu：是提高钢淬透性的元素，能够抑制多边形铁素体和珠光体的形成，促进低温组织如贝氏体的转变，提高正火钢的强度。但Cr与Cu含量过高将增加碳当量CEV，影响钢的焊接性，还会影响表面质量。船级社规范要求Cr不超过0.20％，Cu不超过0.35％。故本发明中铬含量控制在0.10～0.20％、铜含量控制在0.10～0.35％。Cr and Cu: are elements that improve the hardenability of steel, which can inhibit the formation of polygonal ferrite and pearlite, promote the transformation of low-temperature structures such as bainite, and improve the strength of normalized steel. However, too high content of Cr and Cu will increase the carbon equivalent CEV, affect the weldability of the steel, and also affect the surface quality. Classification society regulations require that Cr should not exceed 0.20% and Cu should not exceed 0.35%. Therefore, in the present invention, the chromium content is controlled at 0.10-0.20%, and the copper content is controlled at 0.10-0.35%.
P虽能提高耐蚀性，但会降低低温韧性和妨碍可焊性，对结构钢是不适当的，本发明因为是钢锭冶炼，规定其控制在0.0070％以下。Although P can improve corrosion resistance, it will reduce low temperature toughness and hinder weldability, which is not suitable for structural steel. Because the present invention is steel ingot smelting, it is stipulated that it should be controlled below 0.0070%.
S形成MnS夹杂物，也会导致中心偏析，对耐蚀性也有不良影响，本发明规定在其控制在0.0030％以下。S forms MnS inclusions, which can also lead to center segregation, and also have an adverse effect on corrosion resistance. The present invention stipulates that it should be controlled at 0.0030% or less.
本申请海上风电管桩用FH36钢板的制备方法，包括如下主要步骤The preparation method of FH36 steel plate for offshore wind power pipe piles of the present application includes the following main steps
(1)钢水冶炼：(1) molten steel smelting:
选用优质生铁和废钢作为冶炼原料，选择优质炼钢原辅料，原料依次经转炉冶炼、LF精炼、RH真空脱气、连铸，五大有害残余元素控制：S≤0.0030％，P≤0.0070％，H≤0.00015％，O≤0.0015％，N≤0.0050％；确保钢板成品中的夹杂物A、B、C、D类总级别在3.0级以下；High-quality pig iron and scrap steel are selected as smelting raw materials, and high-quality steel-making raw materials and auxiliary materials are selected. The raw materials are sequentially subjected to converter smelting, LF refining, RH vacuum degassing, and continuous casting. Five harmful residual elements are controlled: S≤0.0030%, P≤0.0070%, H ≤0.00015%, O≤0.0015%, N≤0.0050%; ensure that the total grade of inclusions A, B, C, and D in the finished steel plate is below grade 3.0;
为了抑制铸坯内部疏松、偏析，钢水浇铸过热度为10～20℃，浇铸过程采用全程氩气保护，浇铸成≥360mm厚的连铸坯；入缓冷坑进行48～72小时的缓冷扩氢；缓冷后进行表面清理。In order to suppress the internal loosening and segregation of the slab, the superheat degree of molten steel casting is 10-20 °C, and the whole casting process is protected by argon gas to cast a continuous casting slab with a thickness of ≥ 360 mm; enter the slow cooling pit for 48-72 hours of slow cooling expansion Hydrogen; surface cleaning after slow cooling.
(2)轧制：(2) Rolling:
将连铸坯加热至1180～1220℃，加热时间为11～14min/cm，使钢中的合金元素充分固溶以保证最终产品的成份及性能的均匀性。钢坯出加热炉炉后经高压水除鳞，而后进行粗轧+精轧两阶段控制轧制，在轧制过程中的第1、3、5道次后仍使用高压水除鳞， 粗轧的开轧温度为1050～1100℃，采用大压下量轧制，粗轧后三道单道次压下率为≥12％；精轧开轧温度860～900℃，减少轧制道次量，总轧制道次为8～16道次，精轧完成后进行ACC加速冷却，冷却返红温度为630～680。The continuous casting billet is heated to 1180～1220℃, and the heating time is 11～14min/cm, so that the alloying elements in the steel are fully dissolved to ensure the uniformity of the composition and properties of the final product. After the billet leaves the heating furnace, it is descaled by high-pressure water, and then subjected to two-stage controlled rolling of rough rolling and finishing rolling. The rolling temperature is 1050～1100℃, and the rolling with large reduction is adopted. The rolling reduction rate of three single passes after rough rolling is ≥12%; The total rolling passes are 8 to 16 passes. After finishing rolling, ACC accelerated cooling is carried out, and the cooling and reddening temperature is 630-680.
(3)热矫：(3) Hot correction:
将上述钢板在600-680℃高温下进行温矫，温矫主要对钢板头部、尾部矫直。The above-mentioned steel plate is subjected to warm straightening at a high temperature of 600-680 °C, and the warm straightening mainly straightens the head and tail of the steel plate.
(4)正火热处理：(4) Normalizing heat treatment:
轧制后采用连续炉对钢板正火热处理，连续炉的正火温度为880～920℃，进炉至出炉时间为1.6～2.2min/mm。After rolling, the steel plate is normalized and heat treated in a continuous furnace. The normalizing temperature of the continuous furnace is 880-920°C, and the time from entering the furnace to the furnace is 1.6-2.2 min/mm.
本申请所涉及的钢板在厚度方向不存在明显的梯度组织，钢板基体组织为先共析铁素体+针状铁素体，平均晶粒尺寸为6～15μm，在厚度1/2处，因连铸坯中心偏析的影响，组织主要为基体组织+少量带状珠光体。钢板的屈服强度：364-394MPa，抗拉强度：510-532MPa的范围，延伸率≥27％，-60℃下厚度1/4处、1/2处夏比纵向冲击功≥113J。具备高强度、低温韧性、易卷制。由于碳当量低于CEV≤0.49％，可达到0.47％，所以，钢板具备良好的焊接性。The steel sheet involved in this application has no obvious gradient structure in the thickness direction, the matrix structure of the steel sheet is proeutectoid ferrite + acicular ferrite, and the average grain size is 6-15 μm. The influence of the segregation in the center of the continuous casting billet is mainly matrix structure + a small amount of banded pearlite. Yield strength of steel plate: 364-394MPa, tensile strength: range of 510-532MPa, elongation ≥27%, Charpy longitudinal impact energy ≥113J at 1/4 thickness and 1/2 thickness at -60°C. With high strength, low temperature toughness, easy to roll. Since the carbon equivalent is lower than CEV≤0.49% and can reach 0.47%, the steel sheet has good weldability.
与现有技术相比，本发明的特点在于：Compared with the prior art, the characteristics of the present invention are:
1)基于船级社规范或者GB712的碳锰钢成分体系，主要以C-Mn-Cr-Ni-Cu等淬透性元素为合金体系，增加钢板的淬透性，结合微合金元素Nb、Ti等有效析出，细化晶粒，使得钢板即使达到了100-120mm的生产厚度仍然达到FH36钢板高强度，-60℃低温韧性的要求。1) Based on the composition system of carbon-manganese steel based on classification society specifications or GB712, mainly use hardenability elements such as C-Mn-Cr-Ni-Cu as the alloy system to increase the hardenability of the steel plate, combined with micro-alloying elements Nb, Ti It can effectively precipitate and refine the grains, so that even if the steel plate reaches the production thickness of 100-120mm, it still meets the high strength and -60 ℃ low temperature toughness requirements of the FH36 steel plate.
2)在成分设计中添加Nb，通过Nb可以提高非再结晶温度，将精轧开轧温度下限温度提高到860℃，高温有利于减少轧制道次，缩短粗轧和精轧之间的待温时间，并利用Nb在钢板轧后冷却和正火后的空冷过程中有效析出，钉轧铁素体晶粒三角晶界、晶界、晶内来限制铁素体的快速长大，细化铁素体组织。同时，一定量的Nb提高了控轧阶段的温度区间，并促进了针状铁素体的形成，使得本钢板最终获得的基体组织为先共析铁素体+针状铁素体，达到了强韧化的目的。2) Nb is added in the composition design, the non-recrystallization temperature can be increased by Nb, and the lower limit temperature of finishing rolling and rolling temperature can be increased to 860 ℃. High temperature is beneficial to reduce rolling passes and shorten the time between rough rolling and finishing rolling temperature, and the effective precipitation of Nb in the process of cooling after rolling and air cooling after normalizing, pinning the triangular grain boundary, grain boundary and intragranular of ferrite grains to limit the rapid growth of ferrite and refine iron Body tissue. At the same time, a certain amount of Nb increases the temperature range in the controlled rolling stage, and promotes the formation of acicular ferrite, so that the final matrix structure of this steel sheet is proeutectoid ferrite + acicular ferrite, which achieves the purpose of strengthening.
3)提高Ni含量，有效地保证了钢板在-60℃的冲击性能，配合高压(≥21MPa)除磷水的使用，克服了高Ni、相对高Nb含量给低碳钢板带来的表面质量的不利作用，通过轧前除鳞、轧制前1、3、5道次除鳞，除去表面氧化皮，提高表面质量。3) Increasing the Ni content effectively ensures the impact performance of the steel plate at -60 °C, and with the use of high-pressure (≥21MPa) dephosphorization water, it overcomes the surface quality of the low-carbon steel plate caused by high Ni and relatively high Nb content. Unfavorable effects, by descaling before rolling, 1, 3, and 5 times before rolling, the surface oxide scale is removed, and the surface quality is improved.
4)碳当量CEV≤0.49％的成分控制虽然加大了轧制难度，但是保证了钢板焊接性，使得焊接接头即使冲击温度低至-60℃，仍然达到船级社可焊性要求。4) Although the composition control of carbon equivalent CEV≤0.49% increases the difficulty of rolling, it ensures the weldability of the steel plate, so that even if the impact temperature of the welded joint is as low as -60℃, it still meets the weldability requirements of the classification society.
5)钢水冶炼方法具有残余元素低、钢水洁净度高的优点，特别控制钢中的氧含量，可适用于其它高标准特厚钢种的生产。5) The molten steel smelting method has the advantages of low residual elements and high cleanliness of molten steel, and the oxygen content in the steel is specially controlled, which can be applied to the production of other high-standard and extra-thick steel grades.
6)本发明限定了冷却返红温度为630～680℃，目的是得到钢板厚度方向上均匀细小的先共析铁素体、珠光体组织以及少量的贝氏体组织。若返红温度过低，钢板表层易形成贝氏体、马氏体等组织的激冷层，在后续正火处理后会形成上贝氏体等表层强度高、韧性差的组织。若返红温度过高或不进行ACC处理，钢板厚度1/2处及其附近先共析铁素体晶粒粗大、珠光体组织形成片层状，受组织遗传性影响，在后续正火处理后，钢板厚度1/2处及其附近铁素体晶粒依旧粗大，强度较低，韧性差。6) The present invention limits the cooling reddening temperature to 630-680°C, in order to obtain uniform and fine proeutectoid ferrite, pearlite structure and a small amount of bainite structure in the thickness direction of the steel plate. If the reddening temperature is too low, the surface layer of the steel plate is likely to form a chilled layer of bainite, martensite and other structures, and after the subsequent normalizing treatment, a structure with high surface strength and poor toughness such as upper bainite will be formed. If the reddening temperature is too high or the ACC treatment is not carried out, the proeutectoid ferrite grains will be coarse at 1/2 of the thickness of the steel plate and the pearlite structure will form a lamellar structure. , the ferrite grains at 1/2 of the thickness of the steel plate and its vicinity are still coarse, the strength is low, and the toughness is poor.
7)钢板屈服强度、抗拉强度性能偏标准下限，窄区间控制，有利于海工制造企业钢板卷制。7) The yield strength and tensile strength of the steel plate are on the lower limit of the standard, and the narrow interval control is beneficial to the steel plate coiling of offshore manufacturing enterprises.
图1为本发明实施例1中钢板1/4厚度处的金相组织；Fig. 1 is the metallographic structure at 1/4 thickness of steel plate in Example 1 of the present invention;
图2为本发明实施例1中钢板1/2厚度处的金相组织；Fig. 2 is the metallographic structure at 1/2 thickness of steel plate in Example 1 of the present invention;
图1显示为先共析铁素体+铁状铁素体的混合组织；图2显示为先共析铁素体+铁状铁素体+少量带状珠光体组织，珠光体组织是因为连铸过程中出现的中心偏析导致。Figure 1 shows the mixed structure of pro-eutectoid ferrite + iron-like ferrite; Figure 2 shows the structure of pro-eutectoid ferrite + iron-like ferrite + a small amount of banded pearlite, the pearlite structure is because of the continuous It is caused by the central segregation that occurs during casting.
以下结合附图实施例对本发明作进一步详细描述，所述实施例是示例性的，旨在用于解释本发明，而不能理解为对本发明的限制。The present invention will be further described in detail below with reference to the embodiments of the accompanying drawings. The embodiments are exemplary and are intended to be used to explain the present invention, but should not be construed as a limitation of the present invention.
本发明一种正火态交货的特厚100～120mm海上风电管桩用FH36钢板的生产工艺流程为：转炉->LF精炼->RH真空脱气->Ca处理->连铸->铸坯脱氢处理->加热->轧制->正火。The production process flow of the FH36 steel sheet for the extra-thick 100-120mm offshore wind power pipe pile delivered in the normalized state of the present invention is: converter->LF refining->RH vacuum degassing->Ca treatment->continuous casting->casting Billet dehydrogenation -> heating -> rolling -> normalizing.
本发明实施例1-6的一种正火态交货的特厚100～120mm海上风电管桩用FH36钢板及其制备方法，包括如下步骤：A kind of FH36 steel plate with extra thickness 100-120mm for offshore wind power pipe piles delivered in a normalized state and a preparation method thereof according to Embodiments 1-6 of the present invention, including the following steps:
(1)冶炼：采用150吨转炉冶炼，然后送入LF炉进行精炼并经过RH真空脱气处理，破空进行Ca处理。(1) Smelting: 150-ton converter is used for smelting, and then sent to LF furnace for refining and RH vacuum degassing treatment, and Ca treatment is carried out by breaking the air.
(2)连铸：将冶炼的钢水浇铸成360mm～450mm厚的连铸坯。浇铸温度控制在液相线以上10-20℃。浇铸过程中实施动态轻压下。(2) Continuous casting: Cast the smelted molten steel into a continuous casting slab with a thickness of 360 mm to 450 mm. The casting temperature is controlled at 10-20°C above the liquidus line. Dynamic light reduction is implemented during casting.
(3)铸坯扩氢处理：连铸板坯入坑缓冷扩氢，在坑时间为48-72小时。(3) Hydrogen diffusion treatment of cast slab: The continuous casting slab enters the pit for slow cooling and hydrogen diffusion, and the time in the pit is 48-72 hours.
(4)轧制：将步骤(3)所得连铸坯放入步进式加热炉，将连铸坯加热至1180～1220℃，加热时间为11～14min/cm，使钢中的合金元素充分固溶以保证最终产品的成份及性能的均匀性。钢坯出加热炉炉后经高压(≥21MPa)水除鳞，而后进行粗轧+精轧两阶段控制轧制，在轧制过程中的第1、3、5道次后仍使用高压(≥21MPa)水除鳞，粗轧的开轧温度为1050～1100℃，采用大压下量轧制，粗轧后三道单道次压下率为≥12％，待温厚度1.4～2.0倍于成品厚度；精轧开轧温度860～900℃，减少轧制道次量，总轧制道次为8～16道次，精轧完成后进行ACC加速冷却，冷却返红温度为630～680℃。(4) Rolling: put the continuous casting billet obtained in step (3) into a walking heating furnace, and heat the continuous casting billet to 1180-1220 °C for a heating time of 11-14 min/cm, so that the alloying elements in the steel are sufficiently Solid solution to ensure the uniformity of composition and properties of the final product. After the billet leaves the heating furnace, it is descaled by high-pressure (≥21MPa) water, and then subjected to two-stage controlled rolling of rough rolling and finishing rolling. After the 1st, 3rd, and 5th passes in the rolling process, high pressure (≥21MPa) is still used. ) water descaling, the starting rolling temperature of rough rolling is 1050-1100 ℃, and large reduction is used for rolling. After rough rolling, the three-pass single-pass reduction rate is ≥12%, and the thickness to be warmed is 1.4 to 2.0 times that of the finished product. Thickness; the finishing rolling opening temperature is 860~900℃, reducing the number of rolling passes, the total rolling passes are 8~16 passes, and ACC accelerated cooling is carried out after finishing rolling, and the cooling and reddening temperature is 630~680℃.
(5)热矫：将步骤(4)所得钢板在600-680℃高温下进行温矫，温矫主要对钢板头部、尾部矫直。(5) Hot straightening: the steel plate obtained in step (4) is subjected to warm straightening at a high temperature of 600-680° C. The warm straightening mainly straightens the head and tail of the steel plate.
(6)正火：将步骤(5)所得钢板送入连续炉，正火温度为880-920℃，钢板进炉至出炉时间为1.6-2.2min/mm。(6) Normalizing: the steel plate obtained in step (5) is sent to a continuous furnace, the normalizing temperature is 880-920° C., and the time from the steel plate entering the furnace to being released is 1.6-2.2 min/mm.
(7)对正火后的钢板进行横向拉伸、纵向冲击及金相的检测。(7) The transverse tensile, longitudinal impact and metallographic detection of the normalized steel plate are carried out.
实施例1-6的具体成分、工艺参数见表1、表2。The specific components and process parameters of Examples 1-6 are shown in Table 1 and Table 2.
各实例钢板对应的性能见表3。其中横向拉伸性能中屈服强度介于364-394MPa，抗拉强度介于510-532MPa的范围，延伸率≥27％，-60℃下厚度1/4处、1/2处夏比纵向冲击功≥113J。The properties corresponding to the steel plates of each example are shown in Table 3. Among them, in the transverse tensile properties, the yield strength is in the range of 364-394MPa, the tensile strength is in the range of 510-532MPa, the elongation is ≥27%, and the Charpy longitudinal impact energy is 1/4 and 1/2 of the thickness at -60°C. ≥113J.
钢板板形良好，避免因钢板不平度的问题导致焊接应力，使焊缝薄弱区出现裂缝，结合可靠的焊接技术上，保证海洋工程用FH36特厚钢板具有非常好的焊接性能，保证海上风电机的结构的安全，避免灾难性事故发生。钢板材质均匀，无分层，裂纹等缺陷。探伤结果满足En10160S3E4级要求。钢板表面无气泡、结疤、裂纹、拉裂、折叠、夹杂和压入氧化铁皮。The shape of the steel plate is good, avoiding the welding stress caused by the unevenness of the steel plate, and causing cracks in the weak area of the weld. Combined with reliable welding technology, the FH36 extra-thick steel plate for offshore engineering has very good welding performance and ensures the offshore wind turbine. safety of the structure and avoid catastrophic accidents. The material of the steel plate is uniform, without delamination, cracks and other defects. The flaw detection results meet the requirements of En10160S3E4 level. There are no bubbles, scabs, cracks, cracks, folds, inclusions and iron oxide scales on the surface of the steel plate.
图1、2给出了实施例典型的微观组织照片。成品钢板的微观组织为先共铁素体+铁状铁素体的混合组织，铁素体晶粒尺寸介于6-15um；钢板1/2厚度处的组织为先共铁素体+铁状铁素体的混合组织，以及少量带状珠光体组织。珠光体组织是因为连铸过程中出现的中心偏析导致。可见，通过合理的成分设计进行正火热处理，如此大厚度的钢板，组织控制优异，晶粒并没有因正火后在空气冷却中粗化。在满足钢板高强度的同时，保证了钢板-60℃低温冲击韧性。Figures 1 and 2 show typical microstructure photographs of the examples. The microstructure of the finished steel plate is a mixed structure of pro-eutectic ferrite + iron-like ferrite, and the ferrite grain size is between 6-15um; the structure at 1/2 thickness of the steel plate is pro-eutectic ferrite + iron-like A mixed structure of ferrite, and a small amount of banded pearlite. The pearlite structure is caused by the central segregation in the continuous casting process. It can be seen that normalizing heat treatment through reasonable composition design, such a large thickness of the steel plate, excellent structure control, the grain is not coarsened in the air cooling after normalizing. While meeting the high strength of the steel plate, it also ensures the low temperature impact toughness of the steel plate at -60°C.
表1 实施例特厚100～120mm海上风电管桩用FH36钢板的化学成分(wt％)Table 1 Chemical composition (wt%) of FH36 steel sheet for extra-thick 100-120mm offshore wind power pipe piles
| 实施例Example | CC | SiSi | MnMn | PP | SS | NiNi | CrCr | CuCu | AlAl | TiTi | NbNb | CaCa | CEVCEV |
| 1、21, 2 | 0.130.13 | 0.250.25 | 1.501.50 | 0.0060.006 | 0.00190.0019 | 0.650.65 | 0.150.15 | 0.250.25 | 0.0350.035 | 0.0150.015 | 0.0450.045 | 0.00150.0015 | 0.470.47 |
| 3、43, 4 | 0.120.12 | 0.180.18 | 1.481.48 | 0.0070.007 | 0.00080.0008 | 0.700.70 | 0.130.13 | 0.280.28 | 0.0400.040 | 0.0120.012 | 0.0570.057 | 0.00190.0019 | 0.460.46 |
| 5、65, 6 | 0.110.11 | 0.300.30 | 1.521.52 | 0.0050.005 | 0.00070.0007 | 0.670.67 | 0.180.18 | 0.150.15 | 0.0250.025 | 0.0210.021 | 0.0350.035 | 0.00130.0013 | 0.450.45 |
表2 轧制工艺控制Table 2 Rolling process control
表3 本发明实施例拉伸、冲击性能Table 3 Tensile and impact properties of the embodiments of the present invention
除上述实施例外，本发明还包括有其他实施方式，凡采用等同变换或者等效替换方式形成的技术方案，均应落入本发明权利要求的保护范围之内In addition to the above-mentioned embodiments, the present invention also includes other embodiments, and all technical solutions formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the claims of the present invention
Claims (7)
- 一种正火态交货的100～120mm厚海上风电管桩用FH36钢板，其特征在于：钢板的化学成分基于国家标准GB712和船级社规范，按重量百分比计为：C：0.11～0.13％，Si：0.15～0.50％，Mn：1.20～1.60％，P：≤0.0070％，S：≤0.0030％，Nb：0.030～0.060％，Al：0.020～0.050％，Ti：0.008～0.030％，Ni：0.40～0.80％，Cr：0.10～0.20％，Cu：0.10～0.35％，Ca:0.0005～0050％，余量为Fe及不可避免的杂质元素。A FH36 steel sheet for 100-120mm thick offshore wind power pipe piles delivered in a normalized state, characterized in that the chemical composition of the steel sheet is based on the national standard GB712 and classification society specifications, and is calculated as: C: 0.11-0.13% by weight , Si: 0.15～0.50%, Mn: 1.20～1.60%, P: ≤0.0070%, S: ≤0.0030%, Nb: 0.030～0.060%, Al: 0.020～0.050%, Ti: 0.008～0.030%, Ni: 0.40 to 0.80%, Cr: 0.10 to 0.20%, Cu: 0.10 to 0.35%, Ca: 0.0005 to 0050%, and the balance is Fe and inevitable impurity elements.
- 根据权利要求1所述的正火态交货的100～120mm厚海上风电管桩用FH36钢板，其特征在于：所述钢板的碳当量CEV≤0.49％，其中碳当量CEV由熔炼分析成分采用公式(1)计算The FH36 steel sheet for 100-120mm thick offshore wind power pipe piles delivered in a normalized state according to claim 1, characterized in that: the carbon equivalent CEV of the steel sheet is ≤ 0.49%, wherein the carbon equivalent CEV is determined from the melting analysis components using the formula (1) CalculationCEV(％)＝C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 (1)。CEV(%)=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 (1).
- 根据权利要求2所述的正火态交货的100～120mm厚海上风电管桩用FH36钢板，其特征在于：钢板的化学成分按重量百分比为C：0.13％，Si：0.25％，Mn：1.50％，P：≤0.0060％，S：≤0.0020％，Nb：0.045％，Al：0.035％，Ti：0.015％，Ni：0.65％，Cr：0.15％，Cu：0.25％，Ca:0.0015％，CEV：0.47％，余量为Fe及不可避免的杂质元素。The FH36 steel sheet for 100-120mm thick offshore wind power pipe piles delivered in a normalized state according to claim 2, wherein the chemical composition of the steel sheet is C: 0.13%, Si: 0.25%, Mn: 1.50% by weight %, P: ≤0.0060%, S: ≤0.0020%, Nb: 0.045%, Al: 0.035%, Ti: 0.015%, Ni: 0.65%, Cr: 0.15%, Cu: 0.25%, Ca: 0.0015%, CEV : 0.47%, the balance being Fe and inevitable impurity elements.
- 根据权利要求1所述的正火态交货的100～120mm厚海上风电管桩用FH36钢板，其特征在于：钢板基体组织为先共析铁素体+针状铁素体，平均晶粒尺寸为6～15μm，在钢板芯部或产生少量带状珠光体。The FH36 steel sheet for 100-120 mm thick offshore wind power pipe piles delivered in normalized state according to claim 1, characterized in that: the matrix structure of the steel sheet is proeutectoid ferrite + acicular ferrite, and the average grain size is It is 6 to 15 μm, and a small amount of band-shaped pearlite is produced in the core of the steel plate.
- 根据权利要求4所述的正火态交货的100～120mm厚海上风电管桩用FH36钢板，其特征在于：钢板的屈服强度：364-394MPa，抗拉强度：510-532MPa，延伸率≥27％，-60℃下厚度1/4处、1/2处夏比纵向冲击功≥113J。The FH36 steel plate for 100-120mm thick offshore wind power pipe piles delivered in a normalized state according to claim 4, characterized in that: the yield strength of the steel plate: 364-394MPa, the tensile strength: 510-532MPa, and the elongation ≥ 27 %, Charpy longitudinal impact energy ≥113J at 1/4 thickness and 1/2 thickness at -60°C.
- 一种制备权利要求1-5中任一权项所述正火态交货的100～120mm厚海上风电管桩用FH36钢板的方法，其特征在于：包括如下步骤A method for preparing FH36 steel sheet for offshore wind power pipe piles with a thickness of 100-120 mm and delivered in a normalized state according to any one of claims 1 to 5, characterized in that: comprising the following steps(1)钢水冶炼：(1) molten steel smelting:选用优质生铁和废钢作为冶炼原料，选择优质炼钢原辅料，原料依次经转炉冶炼、LF精炼、RH真空脱气、连铸获得连铸坯，连铸坯的厚度≥360mm，五大有害残余元素控制：S≤0.0030％，P≤0.0070％，H≤0.00015％，O≤0.0015％，N≤0.0050％；确保钢板成 品中的夹杂物A、B、C、D类总级别在3.0级以下；High-quality pig iron and scrap steel are selected as smelting raw materials, and high-quality steel-making raw materials and auxiliary materials are selected. The raw materials are sequentially smelted by converter, LF refining, RH vacuum degassing, and continuous casting to obtain continuous casting billets. The thickness of continuous casting billets is ≥ 360mm, and five harmful residual elements are controlled. : S≤0.0030%, P≤0.0070%, H≤0.00015%, O≤0.0015%, N≤0.0050%; ensure that the total grade of inclusions A, B, C, and D in the finished steel plate is below grade 3.0;连铸坯入缓冷坑进行缓冷扩氢；缓冷后进行表面清理；The continuous casting billet is put into the slow cooling pit for slow cooling and hydrogen diffusion; the surface is cleaned after slow cooling;(2)轧制工艺：(2) Rolling process:将连铸坯加热至1180～1220℃，加热时间为11～14min/cm，使钢中的合金元素充分固溶，钢坯出炉后除鳞，而后进行粗轧+精轧两阶段控制轧制，粗轧的第1、3、5道次后分别使用高压水除鳞，粗轧的开轧温度为1050～1100℃，采用大压下量轧制，粗轧后三道单道次压下率为≥12％；精轧开轧温度860～900℃，减少轧制道次量，总轧制道次控制在8～16道次，精轧完成后进行ACC加速冷却，冷却返红温度为630～680℃；The continuous casting billet is heated to 1180～1220℃, and the heating time is 11～14min/cm, so that the alloy elements in the steel are fully dissolved, and the billet is descaled after being released from the furnace, and then two-stage controlled rolling of rough rolling and finishing rolling is performed. After the 1st, 3rd, and 5th passes of rolling, high-pressure water is used for descaling respectively. The rolling temperature of rough rolling is 1050-1100 °C, and large reduction is used for rolling. After rough rolling, the reduction rate of three single passes is ≥12%; the finishing rolling opening temperature is 860～900℃, reducing the number of rolling passes, the total rolling pass is controlled at 8～16 passes, and ACC accelerated cooling is carried out after finishing rolling, and the cooling and reddening temperature is 630～ 680℃;(3)热矫：(3) Hot correction:钢板在600-680℃温度区间进行温矫，主要对钢板头部、尾部矫直；The steel plate is temperature straightened in the temperature range of 600-680 °C, mainly for straightening the head and tail of the steel plate;(4)正火热处理：(4) Normalizing heat treatment:轧制完成后采用连续炉对钢板正火热处理，连续炉的正火温度为880～920℃，进炉至出炉时间为1.6～2.2min/mm。After the rolling is completed, the steel plate is normalized and heat treated in a continuous furnace. The normalizing temperature of the continuous furnace is 880-920°C, and the time from entering the furnace to the furnace is 1.6-2.2 min/mm.
- 根据权利要求6所述的制备方法，其特征在于：步骤(1)中，为了抑制铸坯内部疏松、偏析，钢水浇铸时的过热度为10～20℃，浇铸过程采用全程氩气保护；连铸坯在缓冷坑的缓冷时间：48～72小时。The preparation method according to claim 6, characterized in that: in step (1), in order to suppress looseness and segregation inside the slab, the superheat degree during casting of molten steel is 10-20°C, and the whole casting process is protected by argon gas; The slow cooling time of the slab in the slow cooling pit: 48 to 72 hours.
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