Heat Treatment of Metals ›› 2025, Vol. 50 ›› Issue (5): 140-145.DOI: 10.13251/j.issn.0254-6051.2025.05.022

• PROCESS RESEARCH • Previous Articles     Next Articles

Heat treatment and microstructure of super martensitic stainlesssteel 04Cr13Ni5Mo runner wheel forgings

Sun Tonghui1,2,3, Chen Huiqin1, Shi Ruxing2,3, Shi Hongqiang2,3   

  1. 1. School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan Shanxi 030024, China;
    2. Luoyang CITIC Heavy Industries Casting and Forging, Luoyang Henan 471039, China;
    3. CITIC Heavy Industries Co., Ltd., Luoyang Henan 471039, China
  • Received:2024-11-25 Revised:2025-03-17 Published:2025-06-25

Abstract: Using the actual production of punching and stripping materials from 04Cr13Ni5Mo steel runner wheel forgings, and specimens were taken from the surface and the center, respectively. Heat treatments under different processes (960 ℃ primary normalizing+590 ℃ primary tempering, (990 ℃+960 ℃) double normalizing+590 ℃ primary tempering, and (990 ℃+960 ℃) double normalizing+(550 ℃+590 ℃) double tempering) were carried out. And inclusions and grain sizes before and after heat treatment were compared and analyzed to determine the optimal heat treatment process. Finally, actual production verification was carried out. The results show that after three different heat treatments, there are no obvious changes in the grain size and inclusion of the 04Cr13Ni5Mo steel forgings compared with those before heat treatment. The grain size remains at grade 4.0 to 4.5. Increasing the number of tempering times during heat treatment can significantly refine the width of the martensite lath bundles in the 04Cr13Ni5Mo steel forgings, and make the microstructure more uniform. In actual production, after heat-treated by double normalizing (990 ℃+960 ℃) and double tempering (550 ℃+590 ℃), the grain size of the 04Cr13Ni5Mo steel forging products is grade 3.5, the KV2 at 0 ℃ is 235.1 J, which is 195.9% of the standard lower limit value (120 J), far exceeding the design requirements, the inclusion is class D, with a grade of 1.0, and meets the requirements of GB/T 10561—2023 standard, and the tensile properties basically meet the technical requirements.

Key words: martensitic stainless steel 04Cr13Ni5Mo, runner wheel, heat treatment, inclusion, grain size, properties

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