技术领域Technical field
本发明涉及金属材料领域，特别涉及一种易焊接耐腐蚀风电用钢及其制备方法。The invention relates to the field of metal materials, and in particular to an easily weldable and corrosion-resistant wind power steel and a preparation method thereof.
背景技术Background technique
风能是一种清洁、安全、可再生、无污染的绿色清洁能源，并且储量丰富，地球上约有2％的太阳能转化为风能，，利用风能发电对环境无污染，生态无破坏，环保效益和生态效益良好，我国有丰富的风能资源，位居世界首位，以风电为代表的清洁能源，发展空间巨大，风电产业的发展对于国家能源结构的调整意义重大。Wind energy is a clean, safe, renewable, pollution-free green clean energy with abundant reserves. About 2% of the solar energy on the earth is converted into wind energy. The use of wind energy to generate electricity has no pollution to the environment, no damage to the ecology, and environmental protection benefits. The ecological benefits are good. my country has abundant wind energy resources, ranking first in the world. Clean energy represented by wind power has huge room for development. The development of the wind power industry is of great significance to the adjustment of the national energy structure.
现有技术中已有有关易焊接的风电用钢的报道，尤其是，国内风电产业技术逐步成熟，风电塔筒广泛应用在沿海、高山、平原等各个风能充足的地方，但是由于地质、环境的限制，以及四季的交替变化，导致风电塔筒的使用环境较为恶劣，因此要求风电塔筒所用钢板，要有较高的耐腐蚀性能，能够长时间在恶劣的环境下正常工作，风电塔筒用钢绝大数都是采用分节连接，每节都是利用钢板焊接卷制成筒状，然后将每个筒节焊接在一起，由于风电塔筒的使用环境决定了风电塔筒用钢板必须有良好的焊接性能和耐腐蚀性能。每个风电塔筒需要近上百吨钢板，为了降低生产成本，同时又保证钢板具有良好的焊接性能、耐腐蚀性能以及其它工艺性能。中国专利公开号为CN104862589A中公开了一种低温焊接性能优良的风电塔筒用钢及其生产方法。其组分及wt％为：C：0.10～0.15％，Si：0.25～0.35％，Mn：0.85～1.20％，P：≤0.015％，S：≤0.008％，Nb：0.013～0.032％，Als：0.025～0.045％，Pr：0.03～0.07％；生产步骤：经冶炼并连铸成坯后对铸坯加热并常规保温；分段热轧；层流冷却；自然冷却至室温；正火；再次自然冷却至室温。该发明采用控轧控冷+正火工艺，生产出钢板屈服强度在355MPa以上，抗拉强度在490～630MPa，延伸率A≥30％，碳当量<0.32，-50℃KV2≥260J，-60℃KV2≥220J。该发明钢板屈服强度级别为355MPa，强度级别偏低，而且碳当量较高，焊接性能仍然不够优异，也没有较好地耐腐蚀性能。中国专利公开号为CN109266926A中公开了公开了一种耐腐蚀性风电塔筒用钢板及其生产方法，所述钢板化学成分组成及其质量百分含量为：C：0.0 7～0.1 4％，S i：0.2 5～0.50％，Mn：1.10～1.60％，P≤0.015％，S≤0.005％，Nb：0.020～0.040％，V：0.030～0.080％，Cu：0.40～0.80％，Al：0.020～0.040％，其余为Fe及不可避免的杂质；所述生产方法包括连铸、加热、轧制、冷却工序。所述连铸工序，二冷区的比水量控制在0.8～0.9L/kg，浇铸过程过热度控制在15～25℃；所述轧制工序，采用Ⅱ型控轧轧制工艺，Ⅰ阶段大压下轧制，开轧首道次压下率为10～12％，Ⅱ阶段开轧温度850～870℃、终轧温度810～830℃。该钢添加了大量Cu，会严重影响钢板的焊接性能，同时该钢种碳当量较高，所以该钢没有较好地焊接性能。There have been reports on wind power steel that is easy to weld in the existing technology. In particular, the domestic wind power industry technology has gradually matured, and wind power towers are widely used in coastal areas, mountains, plains and other places with sufficient wind energy. However, due to geological and environmental factors, Restrictions and the alternation of the four seasons have resulted in a harsh environment for the use of wind power towers. Therefore, the steel plates used in wind power towers are required to have high corrosion resistance and be able to work normally in harsh environments for a long time. Wind power towers are used in Most of the steel is connected in sections. Each section is welded and rolled into a cylinder using steel plates, and then each tube section is welded together. Due to the use environment of wind power towers, the steel plates used in wind power towers must have Good welding performance and corrosion resistance. Each wind power tower requires nearly hundreds of tons of steel plates. In order to reduce production costs, it also ensures that the steel plates have good welding performance, corrosion resistance and other process properties. Chinese patent publication number CN104862589A discloses a wind power tower steel with excellent low-temperature welding performance and a production method thereof. Its components and wt% are: C: 0.10~0.15%, Si: 0.25~0.35%, Mn: 0.85~1.20%, P: ≤0.015%, S: ≤0.008%, Nb: 0.013~0.032%, Als: 0.025～0.045%, Pr: 0.03～0.07%; production steps: after smelting and continuous casting, the billet is heated and conventionally kept warm; segmented hot rolling; laminar cooling; natural cooling to room temperature; normalizing; natural again Cool to room temperature. This invention adopts controlled rolling and controlled cooling + normalizing process to produce steel plates with a yield strength of more than 355MPa, a tensile strength of 490-630MPa, elongation A≥30%, carbon equivalent <0.32, -50℃ KV2≥260J, -60 ℃KV2≥220J. The yield strength level of the steel plate of the invention is 355MPa, which is low in strength level and has a high carbon equivalent. The welding performance is still not excellent enough, and it does not have good corrosion resistance. Chinese Patent Publication No. CN109266926A discloses a corrosion-resistant steel plate for wind power towers and a production method thereof. The chemical composition and mass percentage of the steel plate are: C: 0.0 7 to 0.1 4%, S i: 0.2 5～0.50%, Mn: 1.10～1.60%, P≤0.015%, S≤0.005%, Nb: 0.020～0.040%, V: 0.030～0.080%, Cu: 0.40～0.80%, Al: 0.020～ 0.040%, the rest is Fe and inevitable impurities; the production method includes continuous casting, heating, rolling and cooling processes. In the continuous casting process, the specific water volume in the secondary cooling zone is controlled at 0.8-0.9L/kg, and the superheat degree during the casting process is controlled at 15-25°C; in the rolling process, the Type II controlled rolling process is adopted, and the Stage I large Reduction rolling, the reduction rate of the first pass of opening rolling is 10~12%, the opening rolling temperature in the second stage is 850~870℃, and the final rolling temperature is 810~830℃. A large amount of Cu is added to this steel, which will seriously affect the welding performance of the steel plate. At the same time, this steel type has a high carbon equivalent, so this steel does not have good welding performance.
因此亟待开发一种生产成本低，内部组织均匀，焊接及耐腐蚀性能优良，综合性能稳定的易焊接耐腐蚀性高强韧风电塔筒用钢板具有重要的经济效益和社会效益。Therefore, it is urgent to develop a steel plate for wind power towers with low production cost, uniform internal structure, excellent welding and corrosion resistance, and stable comprehensive performance that is easy to weld, corrosion-resistant, high-strength, and has important economic and social benefits.
发明内容Contents of the invention
本发明针对现有技术存在的不足，提供一种易焊接耐腐蚀风电用钢及其制备方法，该易焊接耐腐蚀风电用钢在回火后屈服强度≥420MPa，抗拉强度≥520MPa，延伸率A≥20％，碳当量0.27～0.4，40kJ/cm的热输入下-40℃冲击吸收能量高于100J。相对于传统Q345钢具有更高的强度和良好的耐蚀性。In view of the shortcomings of the existing technology, the present invention provides an easily weldable and corrosion-resistant wind power steel and a preparation method thereof. The easily weldable and corrosion-resistant wind power steel has a yield strength of ≥420MPa, a tensile strength of ≥520MPa, and an elongation after tempering. A≥20%, carbon equivalent 0.27~0.4, -40°C impact absorption energy higher than 100J under heat input of 40kJ/cm. Compared with traditional Q345 steel, it has higher strength and good corrosion resistance.
本发明为了实现上述目的，提供了一种易焊接耐腐蚀风电用钢，所述风电用钢包括以下按质量百分数计的化学成分：C：0.05-0.10％，Si：0.05-0.15％，Mn：1.0-1.2％，Mo：0.15-0.25％，Nb：0.01-0.03％，Re：0.02-0.04％，Zr：0.015-0.025％，Alt：0.02-0.04％，P<0.01％，S<0.006％，Re+Zr：0.03-0.05％，其余为Fe及不可避免的杂质；显微组织以中温转变组织为主。In order to achieve the above object, the present invention provides an easily weldable and corrosion-resistant steel for wind power. The steel for wind power includes the following chemical components in mass percentage: C: 0.05-0.10%, Si: 0.05-0.15%, Mn: 1.0-1.2%, Mo: 0.15-0.25%, Nb: 0.01-0.03%, Re: 0.02-0.04%, Zr: 0.015-0.025%, Alt: 0.02-0.04%, P<0.01%, S<0.006%, Re+Zr: 0.03-0.05%, the rest is Fe and inevitable impurities; the microstructure is mainly medium-temperature transformation structure.
作为优选，所述风电用钢的厚度≤40mm，进一步优选为≤20mm。Preferably, the thickness of the wind power steel is ≤40 mm, and further preferably is ≤20 mm.
本发明采用TMCP工艺进行生产，获得室温组织以中温转变组织为主的风电用钢；提供一种易焊接耐腐蚀风电用钢的制备方法，包括以下步骤：The present invention adopts the TMCP process for production to obtain wind power steel whose room temperature structure is mainly medium-temperature transformation structure; and provides a preparation method of easily weldable and corrosion-resistant wind power steel, which includes the following steps:
(1)冶炼及成分控制：采用RD+LF+RH的冶炼方式，过程中精确控制合金成分，严格控制P、S、N、O元素的含量；(1) Smelting and composition control: The smelting method of RD+LF+RH is adopted, the alloy composition is precisely controlled during the process, and the contents of P, S, N, and O elements are strictly controlled;
(2)加热：采用明火加热炉进行加热，加热温度为1070-1250℃，加热时间为(9-10)t分钟(t为板坯厚度，单位mm)；(2) Heating: Use an open flame heating furnace for heating, the heating temperature is 1070-1250°C, and the heating time is (9-10)t minutes (t is the thickness of the slab, in mm);
(3)轧制：将加热后的坯料进行轧制，开轧温度为1020-1100℃，轧制5道次后，待温，第二阶段开轧温度为900-920℃，终轧温度为800-900℃；(3) Rolling: Roll the heated billet. The starting rolling temperature is 1020-1100°C. After 5 passes of rolling, wait until it warms up. In the second stage, the starting rolling temperature is 900-920°C and the final rolling temperature is 800-900℃;
(4)冷却：对步骤(3)获得的轧后钢板进行水冷处理，终冷温度550-650℃；得到以中温转变组织的易焊接耐腐蚀风电用钢。(4) Cooling: The rolled steel plate obtained in step (3) is subjected to water cooling treatment with a final cooling temperature of 550-650°C; an easily weldable and corrosion-resistant wind power steel with a medium-temperature transformation structure is obtained.
本发明中各元素的作用：The functions of each element in the present invention:
C是提高钢材强度最有效的元素，随着碳含量的增加，钢的抗拉强度和屈服强度随之提高，但延伸率和冲击韧性下降，而且钢材的焊接热影响区还会出现淬硬现象，导致焊接冷裂纹的产生。本发明中C元素含量控制在0.05-0.10％。C is the most effective element in improving the strength of steel. As the carbon content increases, the tensile strength and yield strength of the steel increase, but the elongation and impact toughness decrease, and the welding heat-affected zone of the steel also undergoes hardening. , leading to the occurrence of welding cold cracks. In the present invention, the C element content is controlled at 0.05-0.10%.
Si是炼钢脱氧的必要元素，以固溶强化形式提高钢的强度，但过高会对表面质量有不利影响本发明中Si元素含量控制在0.05-0.15％。Si is a necessary element for deoxidation in steelmaking and improves the strength of steel in the form of solid solution strengthening. However, if it is too high, it will adversely affect the surface quality. In the present invention, the Si element content is controlled at 0.05-0.15%.
Mn是重要的强韧化元素，随着Mn含量的增加，钢的强度明显增加，改善钢的加工性能，而冲击转变温度几乎不发生变化，含1％的Mn大约可提高抗拉强度100MPa。本发明中Mn元素含量控制在1.0-1.2％。Mn is an important strengthening and toughening element. As the Mn content increases, the strength of the steel increases significantly, improving the processing properties of the steel, while the impact transition temperature hardly changes. Containing 1% Mn can increase the tensile strength by approximately 100MPa. In the present invention, the Mn element content is controlled at 1.0-1.2%.
P、S是钢中难以避免的有害杂质元素。高P会导致偏析，影响钢组织均匀性，降低钢的塑性；S易形成硫化物夹杂对低温韧性不利，且会造成性能的各向异性，同时严重影响钢的应变时效。因此，应严格限制钢中的P、S含量，P<0.01％，S<0.006％。进一步，对钢种P、S含量进行严格控制，P<0.01％，S<0.006％，P+S≤0.012％。P and S are harmful impurity elements that are unavoidable in steel. High P will cause segregation, affect the uniformity of the steel structure, and reduce the plasticity of the steel; S easily forms sulfide inclusions, which is detrimental to low-temperature toughness, and will cause anisotropy of properties and seriously affect the strain aging of the steel. Therefore, the P and S content in steel should be strictly limited, P<0.01%, S<0.006%. Furthermore, the P and S content of steel types are strictly controlled, P<0.01%, S<0.006%, P+S≤0.012%.
Nb可延迟奥氏体再结晶，降低相变温度，晶粒细化作用明显，并可改善低温韧性。Nb通过固溶强化、相变强化、析出强化等机制来获得要求的强度。本发明中Nb元素含量控制在0.01-0.03％。Nb can delay the recrystallization of austenite, reduce the phase transformation temperature, have obvious grain refinement effect, and improve low-temperature toughness. Nb obtains the required strength through mechanisms such as solid solution strengthening, phase change strengthening, and precipitation strengthening. In the present invention, the Nb element content is controlled at 0.01-0.03%.
Alt通常作为钢中的脱氧剂。但Alt含量低于0.02％时，脱氧不充分，当Alt含量高于0.04％时，氧化铝夹杂物增加，降低钢的洁净度。本发明中Alt元素含量控制在0.02-0.04％。Alt is commonly used as a deoxidizer in steel. However, when the Alt content is less than 0.02%, deoxidation is insufficient. When the Alt content is higher than 0.04%, alumina inclusions increase, reducing the cleanliness of the steel. In the present invention, the Alt element content is controlled at 0.02-0.04%.
Mo存在于钢的固溶体和碳化物中，有固溶强化作用，并可提高钢的淬透性。Mo减缓C化物在奥氏体中的溶解速度，对钢由奥氏体分解为珠光体转变有强烈的抑制作用，同时有利于提升盐雾环境的耐蚀性能。本发明中Mo含量控制在0.15-0.25％。Mo exists in the solid solution and carbides of steel, has solid solution strengthening effect, and can improve the hardenability of steel. Mo slows down the dissolution rate of carbide in austenite, has a strong inhibitory effect on the decomposition of steel from austenite to pearlite, and is conducive to improving the corrosion resistance in salt spray environments. In the present invention, the Mo content is controlled at 0.15-0.25%.
Re能改善夹杂物，提高钢的低温韧性和耐蚀性能，本发明中Re元素含量控制在0.02-0.04％。Re can improve inclusions and improve the low-temperature toughness and corrosion resistance of steel. In the present invention, the Re element content is controlled at 0.02-0.04%.
Zr是一种重要的微合金元素，强的固O元素，这种细小的ZrO粒子可有效地阻碍板坯再加热时的奥氏体晶粒长大，细化晶粒，时对改善热影响区的冲击韧性有明显作用。本发明中Zr元素含量控制在0.015-0.025％。Zr is an important micro-alloying element and a strong solid O element. This small ZrO particle can effectively hinder the growth of austenite grains when the slab is reheated, refine the grains, and improve the thermal impact. The impact toughness of the area has a significant effect. In the present invention, the Zr element content is controlled at 0.015-0.025%.
本发明将Re+Zr进行复合添加，细化微观粒子，更进一步得提高了钢的耐腐蚀性能，因此，Re+Zr的含量控制在0.03-0.05％。The present invention adds Re+Zr in a composite manner to refine the microscopic particles and further improve the corrosion resistance of steel. Therefore, the content of Re+Zr is controlled at 0.03-0.05%.
与现有技术相比，本发明的优势在于：Compared with the existing technology, the advantages of the present invention are:
本发明保证焊接厚度不大于40mm的钢板时，在零度环境下无需预热，同时低的CEV使钢板的冷裂倾向更低，有优良的焊接性能。同时具有良好的耐腐蚀性能。The invention ensures that when welding steel plates with a thickness of no more than 40 mm, no preheating is required in a zero-degree environment. At the same time, the low CEV makes the cold cracking tendency of the steel plates lower and has excellent welding performance. It also has good corrosion resistance.
附图说明Description of the drawings
图1为实施例和对比例盐雾试验试样增重结果；Figure 1 shows the weight gain results of the salt spray test samples of the Examples and Comparative Examples;
图2为实施例和对比例盐雾试验腐蚀速率对比结果；Figure 2 is a comparison of the corrosion rate results of the salt spray test of the embodiment and the comparative example;
图3(a)为S420钢板组织形貌图，图3(b)为S420钢板微区电势图。Figure 3(a) is the microstructure morphology of the S420 steel plate, and Figure 3(b) is the micro-area potential map of the S420 steel plate.
具体实施方式Detailed ways
下面结合附图和实施例对本发明的技术方案进行详细的说明，但不局限于以下实施例。对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and examples, but is not limited to the following examples. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.
本实施例为一种高韧性易焊接耐腐蚀风电用钢，其成品板厚为≤40mm，其化学成分及合金元素质量百分比(wt.％)为：C：0.05～0.10％，Si：0.05～0.15％，Mn：1.0～1.2％，Mo：0.15～0.25％，Nb：0.01～0.03％，Re：0.02～0.04％，Zr：0.015～0.025％，Alt：0.02～0.04％，P<0.01％，S<0.006％，其余为Fe及不可避免的杂质。具体化学成分及合金元素百分含量(wt.％)见表1、表2和表3。This embodiment is a high-toughness, easy-to-weld, corrosion-resistant wind power steel. The finished plate thickness is ≤40mm, and its chemical composition and alloy element mass percentage (wt.%) are: C: 0.05~0.10%, Si: 0.05~ 0.15%, Mn: 1.0～1.2%, Mo: 0.15～0.25%, Nb: 0.01～0.03%, Re: 0.02～0.04%, Zr: 0.015～0.025%, Alt: 0.02～0.04%, P<0.01%, S<0.006%, the rest is Fe and inevitable impurities. The specific chemical composition and alloy element percentage (wt.%) are shown in Table 1, Table 2 and Table 3.
表1本发明实施例1的化学成分(wt.％)Table 1 Chemical composition (wt.%) of Example 1 of the present invention
表2本发明实施例2的化学成分(wt.％)Table 2 Chemical composition (wt.%) of Example 2 of the present invention
表3本发明实施例3的化学成分(wt.％)Table 3 Chemical composition (wt.%) of Example 3 of the present invention
本发明提供一种易焊接耐腐蚀风电用钢的制备方法，包括以下步骤：The invention provides a method for preparing easily weldable and corrosion-resistant wind power steel, which includes the following steps:
(1)冶炼及成分控制：采用RD+LF+RH的冶炼方式，过程中精确控制合金成分，严格控制P、S、N、O元素的含量；(1) Smelting and composition control: The smelting method of RD+LF+RH is adopted, the alloy composition is precisely controlled during the process, and the contents of P, S, N, and O elements are strictly controlled;
(2)加热：采用明火加热炉进行加热，加热温度为1070-1250℃，加热时间为(9-10)t分钟(t为板坯厚度，单位mm)；(2) Heating: Use an open flame heating furnace for heating, the heating temperature is 1070-1250°C, and the heating time is (9-10)t minutes (t is the thickness of the slab, in mm);
(3)轧制：将加热后的坯料进行轧制，开轧温度为1020-1100℃，轧制5道次后，待温，第二阶段开轧温度为900-920℃，终轧温度为800-900℃；(3) Rolling: Roll the heated billet. The starting rolling temperature is 1020-1100°C. After 5 passes of rolling, wait until it warms up. In the second stage, the starting rolling temperature is 900-920°C and the final rolling temperature is 800-900℃;
(4)冷却：对步骤(3)获得的轧后钢板进行水冷处理，终冷温度550-650℃；得到以中温转变组织的易焊接耐腐蚀风电用钢。(4) Cooling: The rolled steel plate obtained in step (3) is subjected to water cooling treatment with a final cooling temperature of 550-650°C; an easily weldable and corrosion-resistant wind power steel with a medium-temperature transformation structure is obtained.
实施例1Example 1
本实施例采用成分1，生产一种高韧性易焊接耐腐蚀风电用钢，其成品板厚为16mm，该风电用钢具体生产工艺为：采用RD+LF+RH的冶炼方式，过程中精确控制合金成分，严格控制P、S、N、O元素的含量；采用明火加热炉进行加热，将锻坯置于设定温度为1150℃的加热炉中，保温100min，然后将保温后的钢坯取出去除氧化铁皮，将加热后的坯料进行轧制，经过多道次的轧制，轧成16mm的钢板，轧制过程中第二阶段开轧温度为1050℃，终轧温度为800℃，对获得的轧后钢板进行水冷处理，水冷到620℃，即可得到以中温转变组织的易焊接耐腐蚀风电用钢，50kJ/cm热输入下的-40℃冲击吸收能量为138J。This example uses ingredient 1 to produce a high-toughness, easy-to-weld, corrosion-resistant wind power steel. The finished plate thickness is 16mm. The specific production process of the wind power steel is: using the RD+LF+RH smelting method, with precise control during the process. For the alloy composition, strictly control the content of P, S, N, and O elements; use an open flame heating furnace for heating, place the forging billet in a heating furnace with a set temperature of 1150°C, and keep it warm for 100 minutes, and then take out the heat-insulated steel billet and remove it. Oxide iron scale, the heated billet is rolled, and after multiple passes of rolling, it is rolled into a 16mm steel plate. In the second stage of the rolling process, the starting rolling temperature is 1050°C and the final rolling temperature is 800°C. For the obtained The rolled steel plate is water-cooled to 620°C to obtain an easily weldable and corrosion-resistant wind power steel with a medium-temperature transformation structure. The -40°C impact absorption energy under a heat input of 50kJ/cm is 138J.
实施例2Example 2
本实施例采用成分2，生产一种高韧性易焊接耐腐蚀风电用钢，其成品板厚为20mm，该风电用钢具体生产工艺为：采用RD+LF+RH的冶炼方式，过程中精确控制合金成分，严格控制P、S、N、O元素的含量；采用明火加热炉进行加热，将锻坯置于设定温度为1150℃的加热炉中，保温110min，然后将保温后的钢坯取出去除氧化铁皮，将加热后的坯料进行轧制，经过多道次的轧制，轧成20mm的钢板，轧制过程中第二阶段开轧温度为1050℃，终轧温度为820℃，对获得的轧后钢板进行水冷处理，水冷到580℃，即可得到以中温转变组织的易焊接耐腐蚀风电用钢，50kJ/cm热输入下的-40℃冲击吸收能量为117J。This example uses ingredient 2 to produce a high-toughness, easy-to-weld, corrosion-resistant wind power steel. The finished plate thickness is 20mm. The specific production process of the wind power steel is: using the RD+LF+RH smelting method, with precise control during the process. For the alloy composition, strictly control the content of P, S, N, and O elements; use an open flame heating furnace for heating, place the forging billet in a heating furnace with a set temperature of 1150°C, and keep it warm for 110 minutes, and then take out the heat-insulated steel billet and remove it. Oxide scale, the heated billet is rolled, and after multiple passes of rolling, it is rolled into a 20mm steel plate. In the second stage of the rolling process, the starting rolling temperature is 1050°C, and the final rolling temperature is 820°C. For the obtained The rolled steel plate is water-cooled to 580°C to obtain an easily weldable and corrosion-resistant wind power steel with a medium-temperature transformation structure. The -40°C impact absorption energy under a heat input of 50kJ/cm is 117J.
实施例3Example 3
本实施例采用成分3，生产一种高韧性易焊接耐腐蚀风电用钢，其成品板厚为40mm，该风电用钢具体生产工艺为：采用RD+LF+RH的冶炼方式，过程中精确控制合金成分，严格控制P、S、N、O元素的含量；采用明火加热炉进行加热，将锻坯置于设定温度为1150℃的加热炉中，保温110min，然后将保温后的钢坯取出去除氧化铁皮，将加热后的坯料进行轧制，经过多道次的轧制，轧成40mm的钢板，轧制过程中第二阶段开轧温度为1050℃，终轧温度为860℃，对获得的轧后钢板进行水冷处理，水冷到530℃，即可得到以中温转变组织的易焊接耐腐蚀风电用钢，50kJ/cm热输入下的-40℃冲击吸收能量为135J。In this example, ingredient 3 is used to produce a high-toughness, easy-to-weld, corrosion-resistant wind power steel. The finished plate thickness is 40mm. The specific production process of the wind power steel is: using the RD+LF+RH smelting method, with precise control during the process. For the alloy composition, strictly control the content of P, S, N, and O elements; use an open flame heating furnace for heating, place the forging billet in a heating furnace with a set temperature of 1150°C, and keep it warm for 110 minutes, and then take out the heat-insulated steel billet and remove it. Oxide scale, the heated billet is rolled, and after multiple passes of rolling, it is rolled into a 40mm steel plate. In the second stage of the rolling process, the starting rolling temperature is 1050°C, and the final rolling temperature is 860°C. For the obtained The rolled steel plate is water-cooled to 530°C to obtain an easily weldable and corrosion-resistant wind power steel with a medium-temperature transformation structure. The -40°C impact absorption energy under a heat input of 50kJ/cm is 135J.
三种成分实施钢的力学性能件表4，从表中数据可以看出，本发明制备的易焊接耐腐蚀风电用钢具有良好的力学性能。从附图1和2中可看出，随着试验时间的延长，试样的重量也按照一定的规律相对应的增加，但420MPa钢的增重和腐蚀速率明显低于对比钢种Q345。附图3中可以看出，420MPa钢板显微组织中铁素体与相邻贝氏体之间电势图，贝氏体与相邻铁素体间的电势差小于100mV，有利于提升耐蚀性。The mechanical properties of the three component steels are shown in Table 4. From the data in the table, it can be seen that the easily weldable and corrosion-resistant wind power steel prepared by the present invention has good mechanical properties. It can be seen from Figures 1 and 2 that as the test time prolongs, the weight of the sample also increases correspondingly according to certain rules, but the weight gain and corrosion rate of 420MPa steel are significantly lower than the comparative steel Q345. As can be seen in Figure 3, the potential difference between ferrite and adjacent bainite in the microstructure of the 420MPa steel plate is less than 100mV, which is beneficial to improving corrosion resistance.
表4为三种实施例对应的力学性能数据。Table 4 shows the mechanical property data corresponding to the three examples.
本发明该易焊接耐腐蚀风电用钢在回火后屈服强度≥420MPa，抗拉强度≥520MPa，延伸率A≥20％，碳当量0.27～0.4，50kJ/cm的热输入下-40℃冲击吸收能量高于100J。相对于传统Q345钢具有更高的强度和良好的耐蚀性。The easily weldable and corrosion-resistant wind power steel of the present invention has a yield strength of ≥420MPa, a tensile strength of ≥520MPa, an elongation of A≥20%, a carbon equivalent of 0.27-0.4, and -40°C impact absorption under a heat input of 50kJ/cm after tempering. The energy is higher than 100J. Compared with traditional Q345 steel, it has higher strength and good corrosion resistance.
最后所应说明的是，以上实施例仅用以说明本发明的技术方案而非限制。尽管参照实施例对本发明进行了详细说明，本领域的普通技术人员应当理解，对本发明的技术方案进行修改或者等同替换，都不脱离本发明技术方案的精神和范围，其均应涵盖在本发明的权利要求范围当中。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art will understand that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and they shall all be covered by the scope of the present invention. within the scope of the claims.
| Application Number | Priority Date | Filing Date | Title |
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| CN202310829037.4ACN116855842A (en) | 2023-07-07 | 2023-07-07 | An easy-to-weld, corrosion-resistant wind power steel and its preparation method |
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| CN202310829037.4ACN116855842A (en) | 2023-07-07 | 2023-07-07 | An easy-to-weld, corrosion-resistant wind power steel and its preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070284108A1 (en)* | 2006-04-21 | 2007-12-13 | Roes Augustinus W M | Compositions produced using an in situ heat treatment process |
| US20080128134A1 (en)* | 2006-10-20 | 2008-06-05 | Ramesh Raju Mudunuri | Producing drive fluid in situ in tar sands formations |
| CN101787485A (en)* | 2010-03-30 | 2010-07-28 | 武汉钢铁(集团)公司 | Sea water corrosion-resistant steel with low cost |
| CN102650018A (en)* | 2012-05-29 | 2012-08-29 | 江苏省沙钢钢铁研究院有限公司 | Seawater corrosion resistant steel plate and production method thereof |
| CN103526112A (en)* | 2013-10-18 | 2014-01-22 | 武汉钢铁(集团)公司 | Anti-corrosion steel for bridge tubular pile and production method of anti-corrosion steel |
| CN107326279A (en)* | 2017-06-22 | 2017-11-07 | 舞阳钢铁有限责任公司 | Thermo-mechanical rolling type special thick easily welding S460M structural steel and irons and production method |
| CN107557685A (en)* | 2017-08-30 | 2018-01-09 | 武汉钢铁有限公司 | 440MPa levels ship corrosion-resisting steel and its production method under low temperature environment |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070284108A1 (en)* | 2006-04-21 | 2007-12-13 | Roes Augustinus W M | Compositions produced using an in situ heat treatment process |
| US20080128134A1 (en)* | 2006-10-20 | 2008-06-05 | Ramesh Raju Mudunuri | Producing drive fluid in situ in tar sands formations |
| CN101787485A (en)* | 2010-03-30 | 2010-07-28 | 武汉钢铁(集团)公司 | Sea water corrosion-resistant steel with low cost |
| CN102650018A (en)* | 2012-05-29 | 2012-08-29 | 江苏省沙钢钢铁研究院有限公司 | Seawater corrosion resistant steel plate and production method thereof |
| CN103526112A (en)* | 2013-10-18 | 2014-01-22 | 武汉钢铁(集团)公司 | Anti-corrosion steel for bridge tubular pile and production method of anti-corrosion steel |
| CN107326279A (en)* | 2017-06-22 | 2017-11-07 | 舞阳钢铁有限责任公司 | Thermo-mechanical rolling type special thick easily welding S460M structural steel and irons and production method |
| CN107557685A (en)* | 2017-08-30 | 2018-01-09 | 武汉钢铁有限公司 | 440MPa levels ship corrosion-resisting steel and its production method under low temperature environment |
| Publication | Publication Date | Title |
|---|---|---|
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| CB03 | Change of inventor or designer information | Inventor after:Wang Tengfei Inventor after:Ma Heng Inventor after:Wu Huibin Inventor after:Zhang Pei Inventor after:Zhang Qingpu Inventor after:He Kang Inventor after:Wang Yuexiang Inventor after:Chen Aijiao Inventor after:Li Yan Inventor before:Wang Tengfei Inventor before:Ma Heng Inventor before:Wu Huibin Inventor before:Zhang Pei Inventor before:Zhang Qingpu Inventor before:He Kang Inventor before:Wang Yuexiang Inventor before:Chen Aijiao Inventor before:Li Yan |