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| Cause Analysis for Flange Ring Fracture and Manufacturing Optimization Proposal of S30408 Stainless Steel Pressure Screen Drum |
| Received:October 16, 2025 Revised:November 06, 2025 |
| DOI：10.11980/j.issn.0254-508X.2026.04.027 |
| Key Words:pressure screen drum flange ring fracture S30408 stainless steel failure analysis |
| Fund Project:山东省科技型中小企业创新能力提升项目（2025TSGCCZZB0331）；山东省科技型中小企业创新能力提升项目（2024TSGC0319）。 |
| Author Name | Affiliation | Postcode | | MA Yongheng* | 1College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, Shandong Province, 266042 | 266042 | | NIU Jiangting | 2Shandong Chenzhong Machinery Co., Ltd., Zibo, Shandong Province, 256402 | 256402 | | TIAN Yingpan | 2Shandong Chenzhong Machinery Co., Ltd., Zibo, Shandong Province, 256402 | 256402 | | CHEN Chunfeng | 3Zibo Jindong Machinery Manufacturing Co., Ltd., Zibo, Shandong Province, 256104 | 256104 | | LI Xiaohan | 1College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, Shandong Province, 266042 | 266042 | | HOU Liyue | 1College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, Shandong Province, 266042 | 266042 | | WANG Huiqiu | 2Shandong Chenzhong Machinery Co., Ltd., Zibo, Shandong Province, 256402 | 256402 | | SONG Zhenjian | 2Shandong Chenzhong Machinery Co., Ltd., Zibo, Shandong Province, 256402 | 256402 | | ZHAO Ping* | 1College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, Shandong Province, 266042 | 266042 |
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| Abstract:This paper conducted a systematic failure analysis study on the sudden fracture of the flange ring of an S30408 stainless steel pressure screen drum in a pulp and paper mill during service. Through observations using a metallurgical microscope and a scanning electron microscope, it was found that the base material exhibited a typical austenitic equiaxed grain structure with good overall quality, while the weld zone displayed coarse grains, inhomogeneous microstructure, continuous precipitation of Cr₂₃C₆ carbides, and defects such as pores and inclusions, showing obvious sensitization characteristics. The fracture morphology revealed that cracks mostly initiated from weld defects and gradually propagated under alternating loads, in conjunction with corrosion induced by Cl⁻, S²⁻, K⁺, and other ions in the pulp, ultimately resulting in corrosion fatigue fracture. Energy dispersive spectrometer analysis results confirmed the presence of carbon-oxygen enrichment and chromium depletion on the fracture surface, further indicating that the environmental medium accelerated crack propagation. Based on a comprehensive analysis, an improvement plan was proposed, which included “selecting sensitization-resistant stainless steel materials (such as S30403/S31603), optimizing the welding process and implementing solution heat treatment, and combining corrosion protection with lifespan monitoring” to enhance the corrosion resistance and service life of the screen drum. |
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