压力容器2024，Vol.41Issue(12)：1-7,7.DOI:10.3969/j.issn.1001-4837.2024.12.001
核电主管道316LN不锈钢的组织和性能
Microstructure and mechanical properties of 316LN stainless steel for nuclear power main pipeline
摘要
Abstract
To investigate the performance of 316LN stainless steel for CAP1400 nuclear main pipelines manufactured by solid forging combined with deep-hole trepanning technology,this study conducted comprehensive tests on two pipeline materials,including microstructure analysis,tensile properties,impact toughness,and low-cycle fatigue behavior.The effects of solution treatment on grain size were systematically analyzed.Tensile properties at different orientations and temperatures were compared,revealing a correlation between strength variations and grain size.The influence of thermal aging at 350℃on tensile and impact properties was evaluated.Fatigue performance was further assessed using ASME best-fit fatigue curves and design fatigue curves.Results indicate that the grain size of 316LN steel varies with solution treatment parameters,yet all tensile properties at room temperature and 350℃comply with NB/T 20007.33-2015 requirements.Thermal aging at 350℃(for 1 000,3 000,5 000 h,and simulated 20 000 h)caused no significant degradation in microstructure,tensile strength,or impact toughness compared to the as-fabricated state.Both materials meet ASME code requirements for low-cycle fatigue performance.These findings provide critical references for the design,in-service inspection,and lifetime management of third-generation nuclear main pipelines.关键词
316LN钢/主管道/拉伸性能/热老化/低周疲劳Key words
316LN stainless steel/main pipeline/tensile properties/thermal aging/low-cycle fatigue分类
机械制造引用本文复制引用
侍克献,王延峰,张作贵,王苗苗,田根起..核电主管道316LN不锈钢的组织和性能[J].压力容器,2024,41(12):1-7,7.基金项目
国家科技重大专项项目(2015ZX06002004-001) （2015ZX06002004-001）
