WO2023245886A1 - 正火热处理生产工艺 - Google Patents

正火热处理生产工艺 Download PDF

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WO2023245886A1
WO2023245886A1 PCT/CN2022/119355 CN2022119355W WO2023245886A1 WO 2023245886 A1 WO2023245886 A1 WO 2023245886A1 CN 2022119355 W CN2022119355 W CN 2022119355W WO 2023245886 A1 WO2023245886 A1 WO 2023245886A1
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steel plate
heat treatment
production process
furnace
temperature
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PCT/CN2022/119355
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English (en)
French (fr)
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赵辉
聂文金
李冉
林涛铸
吴玲
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江苏沙钢集团有限公司
张家港宏昌钢板有限公司
江苏省沙钢钢铁研究院有限公司
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Publication of WO2023245886A1 publication Critical patent/WO2023245886A1/zh

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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
    • 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
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention belongs to the technical field of iron and steel metallurgy, and specifically relates to a normalizing heat treatment production process.
  • Normalizing heat treatment is a heat treatment process in which the steel plate is heated to 30°C to 50°C above the Ac3 temperature, kept for an appropriate time, and then cooled after the steel plate is released from the furnace. In the past, sufficient normalization was required during normalizing heat treatment, and the temperature difference between the tapping temperature of the head and tail normalizing heat treatments needed to be controlled within 10°C to ensure the uniformity of the performance of the entire steel plate.
  • the existing steel plate furnace time reaches 1.6min/mm, and the overall production efficiency is low, which seriously restricts the performance of heat treatment capacity.
  • the delivery contradiction is more prominent.
  • the object of the present invention is to provide a normalizing heat treatment production process to improve production efficiency.
  • the present invention adopts the following technical solutions:
  • a normalizing heat treatment production process includes steps:
  • step S2 the slab is directly rolled to the thickness of the finished steel plate by continuous rolling.
  • step S4 after the steel plate is stacked off the line and slowly cooled to below 80°C, the steel plate is sent to the heat treatment raw material warehouse.
  • step S7) the steel plate is cooled by water cooling.
  • step S7) the steel plate is naturally cooled by air.
  • the maximum heating temperature of the heat treatment furnace is 1000°C.
  • the steel plate is normalized structural steel with strength and quality levels below EH36.
  • step S5 the temperature difference between the head and the tail of the steel plate is controlled within the range of 15°C-20°C.
  • step S4) and step S5) the steel plate is subjected to ultrasonic flaw detection.
  • step S4) the steel plate needs to be shot blasted after ultrasonic flaw detection.
  • the beneficial effect of the normalizing heat treatment production process of the present invention is that the temperature in each zone of the heat treatment furnace is set at 940°C-950°C. After the steel plate enters the heat treatment furnace, it can be quickly heated to the austenitizing temperature range to shorten the time in the heat treatment furnace. time to improve normalizing production efficiency.
  • Figure 1 is a flow chart of the normalizing heat treatment production process according to the embodiment of the present invention.
  • this embodiment discloses a normalizing heat treatment production process.
  • the normalizing heat treatment production process includes steps:
  • the heating furnace heating slab is divided into a preheating section, a heating section, and a soaking section.
  • the temperature of the soaking section is also the final temperature before the slab leaves the heating furnace.
  • the final temperature of the slab before leaving the heating furnace is controlled at 1180-1200°C, and the time of the slab in the heating furnace is greater than or equal to 1.0min/mm to ensure that the slab is heated evenly and fully; for example, the temperature of the soaking section is controlled at 1180°C or 1190 °C or 1200°C.
  • S2 Slab rolling: The slab is rolled into the preset finished steel plate size through the rolling mill, and the final rolling temperature is above 940°C; for example, the final rolling temperature is 948°C or 951°C or 953°C.
  • the cooling temperature is 710°C-750°C, and the cooling rate is controlled at 10 ⁇ 5°C/s; this cooling process is the accelerated cooling stage.
  • the cooling temperature is 710°C or 730°C or 750°C.
  • the steel plate is slowly cooled to below 80°C during the off-line stacking process; for example, the steel plate is slowly cooled to 75°C or 78°C during the off-line stacking process.
  • the set temperature of each zone of the heat treatment furnace is 940°C-950°C.
  • the time of the steel plate in the heat treatment furnace is 1.2min/mm-1.4min/mm; for example, the set temperature of each zone of the heat treatment furnace is It is 940°C or 945°C or 950°C, and the steel plate’s time in the heat treatment furnace is 1.2min/mm or 1.3min/mm or 1.4min/mm.
  • the steel plate in this embodiment can be quickly heated to the austenitizing temperature range after entering the heat treatment furnace, thereby shortening the time in the furnace and improving normalizing production efficiency.
  • the normalizing process has the effect of refining and homogenizing the structure.
  • Step S5) shortens the furnace time of the steel plate to 1.2-1.4min/mm, which can increase the heat treatment efficiency by more than 20% compared with the previous furnace time of 1.6min/mm.
  • the temperature at the end of the steel plate should not be lower than 880°C to ensure that the steel plate is fully normalized and completely austenitized.
  • the temperature difference between the head and tail of the steel plate at this time is larger than that of the conventional normalizing process and is controlled within the range of 15-20°C, the performance uniformity of the steel plate is equivalent to that of the conventional normalizing process and has greater applicability.
  • the temperature difference between the head and tail of the steel plate is controlled within the range of 15°C, 18°C, or 20°C, the performance uniformity of the steel plate can still be ensured.
  • step S7) After the steel plate comes out of the heat treatment furnace, cool the steel plate. Specifically, the cooling method is selected according to the strength and quality grade requirements of the steel plate. As a preferred solution, in step S7), the steel plate is accelerated cooled by water cooling. Or as a preferred solution, in step S7), the steel plate is naturally cooled by air.
  • the time in the heating furnace or heat treatment furnace refers to the time from entering the furnace body to leaving the furnace body.
  • this embodiment also includes the following steps: configuring steel grade components, hot metal KR mechanical stirring desulfurization, converter oxygen blowing smelting, LF refining, RH vacuum treatment, wire feeding, soft stirring, slab continuous casting, and slab cutting. .
  • step S2 the slab is rolled directly to the thickness of the finished steel plate by continuous rolling. Specifically, during the continuous rolling process, there is no need to wait for temperature, and there is no need for controlled rolling.
  • the steel plate is directly rolled to the thickness of the finished steel plate with the minimum number of rolling passes.
  • the hourly rolling output of this embodiment can be increased by 30% compared with the conventional controlled rolling process, thus reducing rolling costs.
  • the rolling process control parameters of this embodiment are shown in Table 1.
  • Table 4 Comparison of rolling efficiency and production cost between the process of this embodiment and the conventional controlled rolling process
  • step S4) after the steel plate is stacked off the line and slowly cooled to below 80°C, the steel plate is finished and sent to the heat treatment raw material warehouse.
  • the finishing process is: trimming, sizing, sampling, defect grinding, plate straightening, logo printing, etc. on the steel plate.
  • the maximum heating temperature of the heat treatment furnace is 1000°C to ensure a stable output temperature of 940°C-950°C to ensure production efficiency and quality.
  • the steel plate is normalized structural steel with strength and quality levels below EH36. That is to say, the normalizing heat treatment production process of this embodiment is suitable for normalizing structural steel with strength and quality levels below EH36, and has obvious excellent effects at this time.
  • step S4) and step S5) ultrasonic flaw detection is performed on the steel plate.
  • step S5) the steel plate needs to be shot blasted after ultrasonic flaw detection.
  • the production process is as follows: slab reheating, rolling, steel plate rapid cooling, off-line stack cooling, ultrasonic flaw detection, shot blasting, normalizing, and steel plate cooling.
  • This embodiment has two heat treatment furnaces, namely No. 1 heat treatment furnace and No. 2 heat treatment furnace.
  • the No. 1 heat treatment furnace has a total of 20 zones
  • the No. 2 heat treatment furnace has a total of 24 zones.
  • the upper and lower zones are symmetrically distributed.
  • the odd-numbered zones are the upper zones and the even-numbered zones are the lower zones.
  • the furnace temperature in each zone of the heat treatment furnace is set at 940-950°C.
  • control parameters of the normalizing heat treatment process of the steel plate in this example are shown in Table 2:
  • the normalizing heat treatment production process of this embodiment can reduce production costs and improve production efficiency.
  • the strength level of the steel plate produced by the normalizing heat treatment production process of this embodiment can be up to 36Kg level, the highest quality level can ensure -40°C temperature impact energy ⁇ 150J, the steel plate thickness specification can be up to 120mm, and the internal quality of the steel plate can ensure flaw detection of 120mm specification. Meets the T1 level in NB/T47013.3-2015.
  • the steel plate produced by the normalizing heat treatment production process of this embodiment has the advantages of good performance, excellent internal quality, high production efficiency, low overall manufacturing cost, thick applicable thickness, etc., and has good promotion and application value.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Control Of Heat Treatment Processes (AREA)

Abstract

本发明涉及正火热处理生产工艺。包括步骤：将钢板的板坯送入加热炉进行加热：板坯出炉前的最终温度控制在1180—1200℃，板坯在炉的时间大于等于1.0min/mm；通过轧机将板坯轧制成预设的成品钢板尺寸，终轧温度为940℃以上；钢板冷却温度为710℃—750℃，冷却速率控制在10±5℃/s；钢板下线堆跺缓冷到80℃以下；将钢板送入热处理炉，热处理炉各区温均设定温度为940℃—950℃，钢板在热处理炉的时间为1.2min/mm—1.4min/mm；钢板出热处理炉时，钢板尾部的温度不低于880℃；对钢板进行冷却。本发明能缩短在热处理炉的时间，以提高正火生产效率的目的。

Description

正火热处理生产工艺 技术领域
本发明属于钢铁冶金技术领域，具体涉及一种正火热处理生产工艺。
背景技术
正火热处理是将钢板加热到Ac3温度以上30℃～50℃，保温适当的时间，钢板出炉后进行冷却的热处理工艺。以往正火热处理时要求充分正火，头尾正火热处理出钢温度差需控制在10℃以内，以此保证钢板整板性能的均匀性。
现有的钢板在炉时间达到1.6min/mm，整体生产效率较低，严重制约热处理产能发挥。当热处理正火订单较为充足，交货矛盾比较突出。
基于上述的原因，需要进一步提高正火热处理效率，以扩大产能。
发明内容
本发明的目的在于提供一种正火热处理生产工艺，以提高生产效率。
为达此目的，本发明采用以下技术方案：
一种正火热处理生产工艺，包括步骤：
S1)将钢板的板坯送入加热炉进行加热：所述板坯出所述加热炉前的最终温度控制在1180—1200℃，所述板坯在所述加热炉的时间大于等于1.0min/mm；
S2)板坯轧制：通过轧机将所述板坯轧制成预设的成品钢板尺寸，终轧温度为940℃以上；
S3)钢板冷却：冷却温度为710℃—750℃，冷却速率控制在10±5℃/s；
S4)所述钢板下线堆跺缓冷到80℃以下；
S5)将所述钢板送入热处理炉，所述热处理炉各区温均设定温度为940℃—950℃，所述钢板在所述热处理炉的时间为1.2min/mm—1.4min/mm；
S6)所述钢板出所述热处理炉时，所述钢板尾部的温度不低于880℃；
S7)所述钢板出所述热处理炉后，对所述钢板进行冷却。
优选地，在上述的正火热处理生产工艺中，步骤S2)中，所述板坯采用连续轧制的方式，直接轧至所述钢板成品的厚度。
优选地，在上述的正火热处理生产工艺中，步骤S4)中，所述钢板下线堆跺缓冷到80℃以下后，将所述钢板送热处理原料库。
优选地，在上述的正火热处理生产工艺中，步骤S7)中，所述钢板通过水冷的方式冷却。
优选地，在上述的正火热处理生产工艺中，步骤S7)中，所述钢板通过空气自然冷却。
优选地，在上述的正火热处理生产工艺中，所述热处理炉最高加热温度为1000℃。
优选地，在上述的正火热处理生产工艺中，所述钢板为EH36强度及质量等级以下正火结构钢。
优选地，在上述的正火热处理生产工艺中，步骤S5)中，所述钢板头尾温差控制在15℃-20℃范围内。
优选地，在上述的正火热处理生产工艺中，在步骤S4)与步骤S5)之间，对所述钢板进行超声探伤。
优选地，在上述的正火热处理生产工艺中，在步骤S4)与步骤S5)之间，所述钢板超声探伤后还需要进行抛丸。
本发明的正火热处理生产工艺的有益效果在于：热处理炉各区温均设定温度为940℃—950℃，钢板入热处理炉后可迅速加热至奥氏体化温度范围内，达到缩短在热处理炉的时间，以提高正火生产效率的目的。
附图说明
图1是本发明实施例正火热处理生产工艺的流程图。
具体实施方式
下面结合附图和实施例对本发明作进一步的详细说明。可以理解的是，此处所描述的具体实施例仅仅用于解释本发明，而非对本发明的限定。另外还需要说明的是，为了便于描述，附图中仅示出了与本发明相关的部分而非全部结构。
如图1所示，本实施例公开了一种正火热处理生产工艺。该正火热处理生产工艺包括步骤：
S1)将钢板的板坯送入加热炉进行加热：加热炉加热板坯分为预热段、加热段、均热保温段，均热保温段的温度也是板坯出加热炉前的最终温度，板坯出加热炉前的最终温度控制在1180—1200℃，板坯在加热炉的时间大于等于1.0min/mm，以保证板坯加热均匀充分；例如，均热段温度控制在1180℃或者1190℃或者1200℃。
S2)板坯轧制：通过轧机将板坯轧制成预设的成品钢板尺寸，终轧温度为940℃以上；例如，终轧温度为948℃或者951℃或者953℃。
S3)钢板冷却：冷却温度为710℃—750℃，冷却速率控制在10±5℃/s；这个冷却的过程为加速冷却阶段。例如，冷却温度为710℃或者730℃或者750℃。
S4)钢板下线堆跺缓冷到80℃以下；例如，钢板下线堆跺缓冷到75℃或者78℃。
S5)将钢板送入热处理炉，热处理炉各区温均设定温度为940℃—950℃，钢板在热处理炉时间为1.2min/mm—1.4min/mm；例如，热处理炉各区温均设定温度为940℃或者945℃或者950℃，钢板在热处理炉时间为1.2min/mm或者1.3min/mm或者1.4min/mm。
本实施例钢板入热处理炉后可迅速加热至奥氏体化温度范围内，达到缩短在炉时间，以提高正火生产效率的目的。同时正火工艺对组织有细化及均匀化作用。
步骤S5)使得钢板在炉时间缩短至1.2-1.4min/mm，与前期1.6min/mm在炉时间比热处理效率可提升20％以上。
S6)钢板出热处理炉时，钢板尾部的温度不低于880℃，确保钢板正火充分，完全奥氏体化。虽然此时钢板头尾温差比常规正火工艺要大，控制在15-20℃范围内，但钢板性能均匀性与常规正火工艺相当，具有较大适用性。例如，钢板头尾温差控制在15℃或者18℃或者20℃范围内，仍然能保证钢板性能均匀性。
S7)钢板出热处理炉后，对钢板进行冷却。具体地，根据钢板强度及质量等级要求，选择冷却的方式。作为优选方案，步骤S7)中，钢板通过水冷的方式加速冷却。或者作为优选方案，步骤S7)中，钢板通过空气自然冷却。
本实施例在加热炉或者热处理炉时间指的是进入炉体到离开炉体的时间。
本实施例在步骤S1)之前，还包括步骤：配置钢种成分、铁水KR机械搅拌脱硫、转炉吹氧冶炼、LF精炼、RH真空处理、喂线、软搅拌、板坯连铸、板坯切割。
作为优选方案，步骤S2)中，板坯采用连续轧制的方式，直接轧至钢板成品的厚度。具体地，在连续轧制的过程中不进行待温，也不需要控轧，以最少轧制道次直接轧至钢板成品的厚度。本实施例轧制小时产量比常规控轧工艺可提升30％，降低了轧制成本。本实施例的轧制工艺过程控制参数如表1所示。
表1：轧制工艺过程控制参数：
Figure PCTCN2022119355-appb-000001
针对厚度规格为60-80mm的钢板，本实施例工艺与常规控轧工艺的轧制效率及生产成本对比如表4所示：
表4：本实施例工艺与常规控轧工艺的轧制效率及生产成本对比
Figure PCTCN2022119355-appb-000002
作为优选方案，步骤S4)中，钢板下线堆跺缓冷到80℃以下后，将钢板精整后送热处理原料库。具体地，精整的过程为：对钢板进行切边、定尺、取样、缺陷修磨、板型矫直、标识喷印等。
作为优选方案，热处理炉最高加热温度为1000℃，以保证稳定输出温度为940℃—950℃，保证生产效率和质量。
作为优选方案，钢板为EH36强度及质量等级以下正火结构钢。也即本实施例的正火热处理生产工艺适用于EH36强度及质量等级以下正火结构钢，此时具有明显的优良效果。
作为优选方案，在步骤S4)与步骤S5)之间，对钢板进行超声探伤。作为优选方案，在步骤S4)与步骤S5)之间，钢板超声探伤后还需要进行抛丸。整体而言，生产过程依次为：板坯再加热、轧制、钢板快速冷却、下线堆冷、超声探伤、抛丸、正火、钢板冷却。
本实施例具有两个热处理炉，分别为1号热处理炉和2号热处理炉。1号热处理炉共有20个区，2号热处理炉共有24个区，上下各区呈对称分布，奇数区为上区，偶数区为下区。热处理炉各区炉温均设定940-950℃。
本实施例钢板的正火热处理工艺过程控制参数如表2所示：
表2：钢板的正火热处理工艺过程控制参数
Figure PCTCN2022119355-appb-000003
本实施例正火热处理后钢板的力学性能如表3所示：
表3：正火热处理后钢板的力学性能
Figure PCTCN2022119355-appb-000004
Figure PCTCN2022119355-appb-000005
本实施例针对厚度规格为60-100mm的钢板，得到本实施例热处理工艺与常规热处理工艺生产效率对比，如表5所示：
表5：本实施例热处理工艺与常规热处理工艺生产效率对比
Figure PCTCN2022119355-appb-000006
本实施例的正火热处理生产工艺能够降低生产成本以及提高生产效率。本实施例的正火热处理生产工艺生产的钢板强度级别最高可到36Kg级别，最高质量等级可保证-40℃温度冲击功≥150J，钢板厚度规格最高可至120mm，钢板内部质量可保证120mm规格探伤满足NB/T47013.3-2015中T1级别。
采用本实施例的正火热处理生产工艺生产的钢板具备性能良好、内部质量优良、生产效率高、综合制造成本低、适用厚度厚等优点，具备良好的推广应用价值。
显然，本发明的上述实施例仅仅是为了清楚说明本发明所作的举例，而并非是对本发明的实施方式的限定。对于所属领域的普通技术人员来说，能够进行各种明显的变化、重新调整和替代而不会脱离本发明的保护范围。这里无需也无法对所有的实施方式予以穷举。凡在 本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明权利要求的保护范围之内。

Claims (10)

  1. 一种正火热处理生产工艺，其特征在于，包括步骤：
    S1)将钢板的板坯送入加热炉进行加热：所述板坯出所述加热炉前的最终温度控制在1180—1200℃，所述板坯在所述加热炉的时间大于等于1.0min/mm；
    S2)板坯轧制：通过轧机将所述板坯轧制成预设的成品钢板尺寸，终轧温度为940℃以上；
    S3)钢板冷却：冷却温度为710℃—750℃，冷却速率控制在10±5℃/s；
    S4)所述钢板下线堆跺缓冷到80℃以下；
    S5)将所述钢板送入热处理炉，所述热处理炉各区温均设定温度为940℃—950℃，所述钢板在所述热处理炉的时间为1.2min/mm—1.4min/mm；
    S6)所述钢板出所述热处理炉时，所述钢板尾部的温度不低于880℃；
    S7)所述钢板出所述热处理炉后，对所述钢板进行冷却。
  2. 根据权利要求1所述的正火热处理生产工艺，其特征在于：步骤S2)中，所述板坯采用连续轧制的方式，直接轧至所述钢板成品的厚度。
  3. 根据权利要求1所述的正火热处理生产工艺，其特征在于：步骤S4)中，所述钢板下线堆跺缓冷到80℃以下后，将所述钢板送热处理原料库。
  4. 根据权利要求1所述的正火热处理生产工艺，其特征在于：步骤S7)中，所述钢板通过水冷的方式冷却。
  5. 根据权利要求1所述的正火热处理生产工艺，其特征在于：步骤S7)中，所述钢板通过空气自然冷却。
  6. 根据权利要求1所述的正火热处理生产工艺，其特征在于：所述热处理炉最高加热温度为1000℃。
  7. 根据权利要求1所述的正火热处理生产工艺，其特征在于：所述钢板为EH36强度及质量等级以下正火结构钢。
  8. 根据权利要求1所述的正火热处理生产工艺，其特征在于：步骤S5)中，所述钢板头尾温差控制在15℃-20℃范围内。
  9. 根据权利要求1所述的正火热处理生产工艺，其特征在于：在步骤S4)与步骤S5)之间，对所述钢板进行超声探伤。
  10. 根据权利要求9所述的正火热处理生产工艺，其特征在于：在步骤S4)与步骤S5)之间，所述钢板超声探伤后还需要进行抛丸。
PCT/CN2022/119355 2022-06-23 2022-09-16 正火热处理生产工艺 WO2023245886A1 (zh)

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