| 马永恒,牛江廷,田英盼,陈春峰,李晓含,侯丽悦,汪会秋,宋振键,赵平.压力筛S30408不锈钢筛鼓法兰环断裂成因分析及制造优化方案[J].中国造纸,2026,45(4):217-223 |
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| 压力筛S30408不锈钢筛鼓法兰环断裂成因分析及制造优化方案 |
| Cause Analysis for Flange Ring Fracture and Manufacturing Optimization Proposal of S30408 Stainless Steel Pressure Screen Drum |
| 收稿日期：2025-10-16 修订日期：2025-11-06 |
| DOI：10.11980/j.issn.0254-508X.2026.04.027 |
| 关键词: 压力筛鼓 法兰环断裂 S30408不锈钢 失效分析 |
| Key Words:pressure screen drum flange ring fracture S30408 stainless steel failure analysis |
| 基金项目: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）。 |
| 作者 | 单位 | 邮编 | | 马永恒* | 1青岛科技大学材料科学与工程学院,山东青岛,266042 | 266042 | | 牛江廷 | 2山东晨钟机械股份有限 公司,山东淄博,256402 | 256402 | | 田英盼 | 2山东晨钟机械股份有限 公司,山东淄博,256402 | 256402 | | 陈春峰 | 3淄博金东机械制造有限公司,山东淄博,256104 | 256104 | | 李晓含 | 1青岛科技大学材料科学与工程学院,山东青岛,266042 | 266042 | | 侯丽悦 | 1青岛科技大学材料科学与工程学院,山东青岛,266042 | 266042 | | 汪会秋 | 2山东晨钟机械股份有限 公司,山东淄博,256402 | 256402 | | 宋振键 | 2山东晨钟机械股份有限 公司,山东淄博,256402 | 256402 | | 赵平* | 1青岛科技大学材料科学与工程学院,山东青岛,266042 | 266042 |
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| 摘要:本课题针对某浆纸厂S30408不锈钢压力筛鼓在运行过程中法兰环突发断裂的问题，开展了系统的失效分析研究。通过金相显微镜和扫描电子显微镜观察，发现母材组织为典型奥氏体等轴晶，整体质量较好，而焊缝区晶粒粗大、组织不均匀，伴随连续析出的Cr₂₃C₆碳化物及气孔、夹杂等缺陷，表现出明显敏化特征；断口形貌显示裂纹多从焊缝缺陷处萌生，在交变载荷作用下逐步扩展，并与纸浆中的Cl-、S2-、K+等离子引发的腐蚀共同作用，最终形成腐蚀疲劳断裂。能谱检测结果证实断口表面存在碳氧富集和贫铬现象，进一步说明环境介质加速了裂纹扩展。在综合分析的基础上，提出了“选用抗敏化不锈钢材料（如S30403/S31603），优化焊接工艺并实施固溶热处理，腐蚀防护与寿命监测相结合”的改进方案，以提升筛鼓的耐蚀性和工作寿命。 |
| 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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