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Study on the high‑temperature irradiation behavior of austenitic stainless steel 316H for pressure vessels
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Zhe LI, Yuerong WANG, Shaoyang JIAO
Pressure Vessel Technology | 2026, 43(3) : 42 - 50
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Pressure Vessel Technology | 2026, 43(3): 42-50
• Experimental Researches •
Study on the high‑temperature irradiation behavior of austenitic stainless steel 316H for pressure vessels
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Zhe LI, Yuerong WANG, Shaoyang JIAO
Affiliations
  • China Nuclear Power Engineering Co.，Ltd.，Beijing 100840，China
Published: 2026-03-30 doi: 10.3969/j.issn.1001-4837.2026.03.004
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To address the lack of high‑temperature irradiation performance data for the austenitic stainless steel 316H，the material used for the reactor pressure vessel of a fourth‑generation high‑temperature gas‑cooled microreactor，at the design operating temperature of 550 ℃，a research plan involving irradiation damage tests and aging tests was proposed.The SRIM software was used to simulate the trajectories and irradiation damage defects of energetic ions （He2+） incident on the material.Combined with high‑temperature irradiation tests under different cumulative irradiation doses （0.005，0.05，0.5 dpa） and an irradiation aging test at 650 ℃ for 100 h，the evolution laws of the material's high‑temperature damage behavior and aging behavior with microstructure were established.The results show that at the design temperature of 550 ℃，316H exhibits good irradiation resistance.The irradiation damage layer is approximately several micrometers thick，and the damage mainly manifests as microvoids and dislocations.After aging at 650 ℃ for 100 h，carbides precipitate along grain boundaries，with C and Mo elements enriching at the grain boundaries and Cr element depleting near the grain boundaries，presenting a certain risk of failure.This study provides a reference for subsequent engineering implementation of in‑reactor irradiation tests.

high‑temperature reactor  /  316H  /  high‑temperature irradiation damage
李哲, 王跃蓉, 焦少阳. 压力容器用奥氏体不锈钢316H的高温辐照行为研究. 压力容器, 2026 , 43 (3) : 42 -50 . DOI: 10.3969/j.issn.1001-4837.2026.03.004
Zhe LI, Yuerong WANG, Shaoyang JIAO. Study on the high‑temperature irradiation behavior of austenitic stainless steel 316H for pressure vessels[J]. Pressure Vessel Technology, 2026 , 43 (3) : 42 -50 . DOI: 10.3969/j.issn.1001-4837.2026.03.004
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Year 2026 volume 43 Issue 3
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doi: 10.3969/j.issn.1001-4837.2026.03.004
  • Receive Date：2025-06-25
  • Online Date：2026-10-23
  • Published：2026-03-30
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  • Received：2025-06-25
  • Revised：2025-11-08
Affiliations
    China Nuclear Power Engineering Co.，Ltd.，Beijing 100840，China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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