WO2024066997A1 - 290 mpa-grade low-yield-strength steel used in low-temperature harsh environment, and manufacturing method therefor - Google Patents
290 mpa-grade low-yield-strength steel used in low-temperature harsh environment, and manufacturing method therefor Download PDFInfo
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- WO2024066997A1 WO2024066997A1 PCT/CN2023/117363 CN2023117363W WO2024066997A1 WO 2024066997 A1 WO2024066997 A1 WO 2024066997A1 CN 2023117363 W CN2023117363 W CN 2023117363W WO 2024066997 A1 WO2024066997 A1 WO 2024066997A1
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 45
- 239000010959 steel Substances 0.000 title claims abstract description 45
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000005096 rolling process Methods 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000005098 hot rolling Methods 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 2
- 229910001562 pearlite Inorganic materials 0.000 abstract description 3
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 3
- 239000011159 matrix material Substances 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 11
- 229910006639 Si—Mn Inorganic materials 0.000 description 7
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 229910052758 niobium Inorganic materials 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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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
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Provided are 290 Mpa-grade low-yield-strength steel used in a low-temperature harsh environment, and a manufacturing method therefor, relating to the technical field of steel manufacturing. The low-yield-strength steel comprises the following components in percentage by weight: 0.06%≤C≤0.12%, 0.1%≤Si≤0.3%, 0.9%≤Mn≤1.2%, P≤0.026%, S≤0.016%, 0.01%≤Al≤0.06%, and the remainder being Fe and inevitable impurities. The specific steps are: (1) a heating process; (2) a hot rolling process; and (3) a cooling process. A low-yield-strength steel plate can be obtained by low-cost component design, two-stage controlled rolling, and a cooling process, wherein the thickness is less than or equal to 100 mm, the yield strength is 270-310 MPa, the impact at -60°C is larger than or equal to 200 J, and the matrix structure is blocky ferrite plus pearlite.
Description
本发明涉及钢铁制造技术领域，涉及一种低温恶劣环境使用290Mpa级低屈服强度钢及其制造方法。The invention relates to the technical field of steel manufacturing, and relates to a 290Mpa grade low yield strength steel for use in a low temperature and harsh environment and a manufacturing method thereof.
随着建筑抗震技术的发展，消能抗震技术由于其良好的抗震效果成为建筑结构抗震设计的发展方向，用于制作建筑消能阻尼器的低屈服点钢已成为抗震用钢的新钢种。在本发明之前已经多个关于建筑抗震用低屈服点钢的相关专利，如公开号为CN201910431896.1的专利公开了一种290Mpa级抗震用低屈服强度钢及其生产方法，该发明仅采用低C-Si-Mn的成分设计，合金成本低，且冲击韧性只适用于常温环境使用；公开号为“CN101845589”和“JP10324918A”的专利，均公布了一种极低屈服点钢板及其制造方法，其屈服强度在140MPa左右。发明均在低C-Si-Mn的基础上添加N、Ti、Nb中的一种或者多种，并含有B元素，然而B的添加不仅提高了钢板的制造成本、増加了冶炼难度；公开号为CN101775536A的专利公开了一种225MPa级抗震用低屈服强度钢及其制造方法，该发明采用低C，低Si-Mn的成分设计，并选择添加了Ti、Nb或V中的一种或者多种，该设计使用贵重金属元素，成本高；公开号为CN101781736的专利公开了一种屈服强度225MPa级抗震建筑用钢及其生产方法，该发明采用低C，低Si-Mn的成分设计，添加了Re、Mg等金属元素，该设计方案添加的合金冶炼难度较大、工艺难以控制，而且后续热处理时间长，增加了生产周期和成本；公开号为CN101392350的专利公开了一种极低屈服点钢板及其制造方法，该发明采用低C-Si-Mn的成分设计，添加了Nb、V、Ti等微合金元素，其屈服强度在235MPa左右，该成分设计使用贵金属成本高；公开号为CN201410697184.1的专利公开了低温恶劣环境使用的225级低屈服强度钢及其生产方法，该发明采用低C-Si-Mn的成分设计，添加了Nb、Ni、Ti等微合金元素，合金成本高，冶炼难度大，其适用低温环境温度只能达到-40℃；公开号为CN201910431896.1的专利公开了一种290Mpa级抗震用低屈服强度钢及其生产方法，该发明仅采用低C-Si-Mn的成分设计，合金成本低，但其冲击韧性只适用于常温环境使用；以上所列专利中钢的性能要求与本发明的要求不同，所以在成分设计以及制造方式上与本发明存在差异。With the development of building seismic technology, energy dissipation seismic technology has become the development direction of building structure seismic design due to its good seismic effect. Low yield point steel used to make building energy dissipation dampers has become a new type of seismic steel. Before the present invention, there have been many related patents on low yield point steel for building seismic resistance, such as the patent with publication number CN201910431896.1, which discloses a 290Mpa grade seismic low yield strength steel and its production method. The invention only adopts low C-Si-Mn composition design, low alloy cost, and impact toughness is only suitable for use in normal temperature environment; the patents with publication numbers "CN101845589" and "JP10324918A" both disclose an extremely low yield point steel plate and its manufacturing method, and its yield strength is about 140MPa. The inventions all add one or more of N, Ti, and Nb on the basis of low C-Si-Mn, and contain B element. However, the addition of B not only increases the manufacturing cost of the steel plate, but also increases the difficulty of smelting; the patent with publication number CN101775536A discloses a 225MPa grade seismic low yield strength steel and a manufacturing method thereof. The invention adopts a low C, low Si-Mn composition design, and selectively adds one or more of Ti, Nb or V. The design uses precious metal elements and has high cost; the patent with publication number CN101781736 discloses a 225MPa grade seismic resistant building steel and a production method thereof. The invention adopts a low C, low Si-Mn composition design, and adds metal elements such as Re and Mg. The alloy added by the design scheme is difficult to smelt, the process is difficult to control, and the subsequent heat treatment time is long, which increases the production cycle and cost; the patent with publication number CN101392350 discloses an extremely low yield point steel plate and its manufacturing method. The invention adopts a low C-Si-Mn composition design and adds micro-alloy elements such as Nb, V, and Ti. Its yield strength is about 235MPa. The cost of using precious metals in this composition design is high; the patent with publication number CN201410697184.1 discloses a 225-grade low-yield strength steel for use in low-temperature harsh environments and its production method. The invention adopts a low C-Si-Mn composition design and adds micro-alloy elements such as Nb, Ni, and Ti. The alloy cost is high and the smelting difficulty is large. The applicable low-temperature environment temperature can only reach -40°C; the patent with publication number CN201910431896.1 discloses a 290Mpa-grade seismic low-yield strength steel and its production method. The invention only adopts a low C-Si-Mn composition design, and the alloy cost is low, but its impact toughness is only suitable for use in normal temperature environments; the performance requirements of steel in the above-listed patents are different from those of the present invention, so there are differences in composition design and manufacturing methods from the present invention.
发明内容Summary of the invention
发明目的：本发明的目的是提供了一种低温恶劣环境使用290Mpa级低屈服
强度钢及其制造方法。Purpose of the invention: The purpose of the present invention is to provide a 290Mpa grade low yield High strength steel and method of making the same.
技术方案：本发明所述的一种低温恶劣环境使用290Mpa级低屈服强度钢，其成分重量百分比为：0.06％≤C≤0.12％、0.1％≤Si≤0.3％、0.9％≤Mn≤1.2％、P≤0.026％、S≤0.016％、0.01％≤Al≤0.06％，余量为Fe和不可避免杂质。Technical solution: The present invention discloses a 290Mpa grade low yield strength steel for use in a low temperature and harsh environment, wherein the weight percentage of the components is: 0.06%≤C≤0.12%, 0.1%≤Si≤0.3%, 0.9%≤Mn≤1.2%, P≤0.026%, S≤0.016%, 0.01%≤Al≤0.06%, and the remainder is Fe and unavoidable impurities.
进一步的，所述低屈服强度钢的厚度≤100mm，屈服强度YP＝270～310Mpa，屈强比≤80％，A50≥40％，-60℃冲击≥200J。Furthermore, the thickness of the low yield strength steel is ≤100 mm, the yield strength YP=270-310 MPa, the yield strength ratio is ≤80%, A 50 ≥40%, and the -60°C impact is ≥200 J.
进一步的，一种低温恶劣环境使用290Mpa级低屈服强度钢的制造方法，其具体制备步骤如下：Furthermore, a method for manufacturing 290Mpa grade low yield strength steel for use in a low temperature harsh environment is provided, wherein the specific preparation steps are as follows:
(1)、加热工序；(1) Heating process;
(2)、热轧工序；(2) Hot rolling process;
(3)、冷却工序。(3) Cooling process.
进一步的，在步骤(1)的加热工序中，钢坯的加热温度在1200℃～1230℃。Furthermore, in the heating process of step (1), the heating temperature of the steel billet is between 1200°C and 1230°C.
进一步的，在步骤(2)的热轧工序中，采用两阶段控制轧制，确保精轧阶段轧制温度控制在800℃～870℃。Furthermore, in the hot rolling process of step (2), two-stage controlled rolling is adopted to ensure that the rolling temperature in the finishing rolling stage is controlled at 800°C to 870°C.
进一步的，在步骤(3)的冷却工序中，是采用水冷或空冷至室温。Furthermore, in the cooling process of step (3), water cooling or air cooling is used to cool to room temperature.
有益效果：本发明与现有技术相比，通过低成本的成分设计，配合以两阶段的控制轧制和冷却工艺便可获得低屈服强度钢板厚度≤100mm，屈服强度YP为270～310Mpa，-60℃冲击≥200J，基体组织为块状铁素体+珠光体。Beneficial effects: Compared with the prior art, the present invention, through low-cost component design, combined with a two-stage controlled rolling and cooling process, can obtain a low yield strength steel plate with a thickness of ≤100mm, a yield strength YP of 270-310Mpa, an impact of -60℃ ≥200J, and a matrix structure of blocky ferrite + pearlite.
图1是本发明实施例1所得钢板1/4处金相组织形图，其为铁素体+珠光体组织，晶粒尺寸约10～30um。FIG. 1 is a metallographic structure diagram of the steel plate at 1/4 obtained in Example 1 of the present invention, which is a ferrite + pearlite structure with a grain size of about 10 to 30 um.
下面结合实施例对本发明作进一步的说明。The present invention will be further described below in conjunction with the embodiments.
本发明所述的一种低温恶劣环境使用290Mpa级低屈服强度钢及其制造方法，其成分重量百分比为：0.06％≤C≤0.12％、0.1％≤Si≤0.3％、0.9％≤Mn≤1.2％、P≤0.026％、S≤0.016％、0.01％≤Al≤0.06％，余量为Fe和不可避免杂质。The present invention discloses a 290Mpa grade low yield strength steel for use in a low temperature and harsh environment and a manufacturing method thereof, wherein the weight percentage of the components is: 0.06%≤C≤0.12%, 0.1%≤Si≤0.3%, 0.9%≤Mn≤1.2%, P≤0.026%, S≤0.016%, 0.01%≤Al≤0.06%, and the balance is Fe and unavoidable impurities.
进一步的，所述一种低温恶劣环境使用290Mpa级低屈服强度钢板厚度≤100mm，屈服强度YP为270～310Mpa，屈强比≤80％，A50≥40％，-60℃冲击≥200J。Furthermore, the low-temperature harsh environment uses a 290Mpa-grade low-yield strength steel plate with a thickness of ≤100mm, a yield strength YP of 270-310Mpa, a yield strength ratio of ≤80%, A 50 ≥40%, and an impact of ≥200J at -60°C.
进一步的，本发明所述的一种290Mpa级抗震用低屈服强度钢及其制造方法，包括以下步骤：(1)、加热工序，(2)、热轧工序，(3)、冷却工序。Furthermore, the 290 MPa grade earthquake-resistant low yield strength steel and its manufacturing method described in the present invention include the following steps: (1) a heating process, (2) a hot rolling process, and (3) a cooling process.
进一步的，在步骤(1)中，钢坯采用加热炉加热，加热段温度控制1230±20℃，总在炉时间(0.9～1.5)H(H-钢板厚度)。Furthermore, in step (1), the steel billet is heated in a heating furnace, the temperature of the heating section is controlled at 1230±20°C, and the total time in the furnace is (0.9-1.5)H (H-steel plate thickness).
进一步的，步骤(2)中，采用两阶段控制轧制，钢板从加热炉出来后，抛
钢至轧钢台，确保粗轧终轧温度控制在900℃～980℃，精轧阶段轧制温度控制在800℃～870℃。Furthermore, in step (2), two-stage controlled rolling is adopted, and after the steel plate comes out of the heating furnace, it is polished. The steel is transported to the rolling table to ensure that the rough rolling and final rolling temperatures are controlled at 900℃ ~ 980℃, and the finishing rolling temperature is controlled at 800℃ ~ 870℃.
进一步的，步骤(3)中，采用水冷或空冷至室温，返红温度为600～650℃。Furthermore, in step (3), water cooling or air cooling is used to cool the mixture to room temperature, and the red-returning temperature is 600-650°C.
实施例1到实施例5Embodiment 1 to Embodiment 5
一种低温恶劣环境使用290Mpa级低屈服强度钢及其制造方法，厚度16～50mm，成分重量百分比如表1所示，余量为Fe和不可避免杂质。A 290 MPa grade low yield strength steel for use in low temperature and harsh environment and a manufacturing method thereof, with a thickness of 16 to 50 mm and composition weight percentages as shown in Table 1, with the remainder being Fe and unavoidable impurities.
表1化学成分％
Table 1 Chemical composition %
Table 1 Chemical composition %
制造方法包括以下步骤：The manufacturing method comprises the following steps:
(1)、加热工序：钢坯采用加热炉加热，加热段温度控制1230±20℃，总在炉时间(0.9～1.5)H；(1) Heating process: The steel billet is heated in a heating furnace, the temperature of the heating section is controlled at 1230±20℃, and the total time in the furnace is (0.9～1.5)H;
(2)、热轧工序：轧前连铸坯加热出炉后，以1.5m/s的速度抛钢至轧钢台，两阶段控制轧制，确保粗轧终轧温度控制在900℃～980℃，精轧阶段轧制温度控制在800℃～870℃。(2) Hot rolling process: After the continuous casting billet is heated and taken out of the furnace before rolling, it is thrown to the rolling table at a speed of 1.5m/s and rolled in two stages to ensure that the rough rolling and final rolling temperatures are controlled at 900℃~980℃, and the finishing rolling temperature is controlled at 800℃~870℃.
(3)、冷却工序：采用水冷或空冷至室温，返红温度为600～650℃。(3) Cooling process: Use water cooling or air cooling to room temperature, and the red-return temperature is 600-650℃.
实施例1-5具体轧制工艺参数如表2所示。The specific rolling process parameters of Examples 1-5 are shown in Table 2.
表2实施例1-5轧制及冷却工艺参数
Table 2 Rolling and cooling process parameters of Examples 1-5
Table 2 Rolling and cooling process parameters of Examples 1-5
实施例1-5获得的产品性能如表3。The product properties obtained in Examples 1-5 are shown in Table 3.
表3实施例1-5所得产品性能
Table 3 Performance of products obtained in Examples 1-5
Table 3 Performance of products obtained in Examples 1-5
根据上述性能结果可见，本发明制备所得钢板具有非常高的延伸率和良好的低温冲击韧性，并且本发明方法可以制备的低屈服强度钢板厚度范围广，应用范围广。According to the above performance results, it can be seen that the steel plate prepared by the present invention has very high elongation and good low-temperature impact toughness, and the low yield strength steel plate that can be prepared by the method of the present invention has a wide thickness range and a wide range of applications.
以上仅是本发明的优选实施方式，本发明的保护范围并不仅局限于上述实施例，凡属于本发明思路下的技术方案均属于本发明的保护范围。应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理前提下的若干改进和润饰，应视为本发明的保护范围。
The above are only preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.
Claims (6)
- 一种低温恶劣环境使用290Mpa级低屈服强度钢，其特征在于，其成分重量百分比为：0.06％≤C≤0.12％、0.1％≤Si≤0.3％、0.9％≤Mn≤1.2％、P≤0.026％、S≤0.016％、0.01％≤Al≤0.06％，余量为Fe和不可避免杂质。A 290 MPa grade low yield strength steel for use in low temperature and harsh environment, characterized in that its components by weight percentage are: 0.06%≤C≤0.12%, 0.1%≤Si≤0.3%, 0.9%≤Mn≤1.2%, P≤0.026%, S≤0.016%, 0.01%≤Al≤0.06%, and the balance is Fe and unavoidable impurities.
- 根据权利要求1所述的一种低温恶劣环境使用290Mpa级低屈服强度钢，其特征在于，According to claim 1, a 290Mpa grade low yield strength steel for use in a low temperature harsh environment is characterized in that:所述低屈服强度钢的厚度≤100mm，屈服强度YP＝270～310Mpa，屈强比≤80％，A50≥40％，-60℃冲击≥200J。The low yield strength steel has a thickness of ≤100 mm, a yield strength YP of 270-310 MPa, a yield strength ratio of ≤80%, A 50 ≥40%, and an impact strength of ≥200 J at -60°C.
- 如权利要求1-2任意所述的一种低温恶劣环境使用290Mpa级低屈服强度钢的制造方法，其特征在于，其具体制备步骤如下：The method for manufacturing a 290 MPa grade low yield strength steel for use in a low temperature and harsh environment as described in any of claims 1-2 is characterized in that the specific preparation steps are as follows:(1)、加热工序；(1) Heating process;(2)、热轧工序；(2) Hot rolling process;(3)、冷却工序。(3) Cooling process.
- 根据权利要求3所述的一种低温恶劣环境使用290Mpa级低屈服强度钢的制造方法，其特征在于，The method for manufacturing 290 MPa grade low yield strength steel for use in low temperature and harsh environment according to claim 3 is characterized in that:在步骤(1)的加热工序中，钢坯的加热温度在1200℃～1230℃。In the heating process of step (1), the heating temperature of the steel billet is between 1200°C and 1230°C.
- 根据权利要求3所述的一种低温恶劣环境使用290Mpa级低屈服强度钢的制造方法，其特征在于，The method for manufacturing 290 MPa grade low yield strength steel for use in low temperature and harsh environment according to claim 3 is characterized in that:在步骤(2)的热轧工序中，采用两阶段控制轧制，确保精轧阶段轧制温度控制在800℃～870℃。In the hot rolling process of step (2), two-stage controlled rolling is adopted to ensure that the rolling temperature in the finishing rolling stage is controlled at 800°C to 870°C.
- 根据权利要求3所述的一种低温恶劣环境使用290Mpa级低屈服强度钢的制造方法，According to the method for manufacturing 290Mpa grade low yield strength steel for use in low temperature and harsh environment according to claim 3,在步骤(3)的冷却工序中，是采用水冷或空冷至室温。 In the cooling process of step (3), water cooling or air cooling is used to cool to room temperature.
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