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Effect of short‑term overtemperature service on microstructure and properties of 30CrNiMo8 steel
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Ruomeng YAN1, Qifei HUANG2, Ying ZHANG3, Shouguang JI4, Tianxue YANG5, Kanglin LIU2
Pressure Vessel Technology | 2026, 43(1) : 9 - 16
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Pressure Vessel Technology | 2026, 43(1): 9-16
• Experimental Researches •
Effect of short‑term overtemperature service on microstructure and properties of 30CrNiMo8 steel
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Ruomeng YAN1, Qifei HUANG2, Ying ZHANG3, Shouguang JI4, Tianxue YANG5, Kanglin LIU2
Affiliations
  • 1The Fourth Research and Design Engineering Corporation of CNNC，Shijiazhuang 050021，China
  • 2College of Chemical Engineering，Fuzhou University，Fuzhou 350116，China
  • 3Changzhou University，Changzhou 213164，China
  • 4PetroChina Daqing Petrochemical Company，Daqing 163714，China
  • 5Fujian Special Equipment Inspection and Research Institute，Fuzhou 350008，China
Published: 2026-01-30 doi: 10.3969/j.issn.1001-4837.2026.01.002
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To address the short‑term overtemperature issues during service of ultra‑high‑pressure polyethylene tubular reactors，optical microscopy （OM），scanning electron microscopy （SEM），energy‑dispersive X‑ray spectroscopy （EDS），Vickers hardness testing，and nanoindentation were employed to systematically investigate the effects of overtemperature temperature，duration，and overtemperature cycles on the microstructure and mechanical properties of key material 30CrNiMo8 steel.Results show that during overtemperature for approximately 30 s，the primary effect on 30CrNiMo8 steel shifts from phase transformation to changes in grain size and morphology，manifested as enhanced brittleness and reduced hardness.When overtemperature exceeds the complete austenitization temperature Ac3 to 860 ℃，material hardness first sharply increases then decreases due to massive martensite precipitation，carbide formation，and segregation of C，Cr，and Mo elements at grain boundaries.After 6 overtemperature cycles，martensite laths significantly widen with altered bundle orientations，causing grain structure coarsening and mechanical property degradation.This study provides data support and design references for safe operation of ultra‑high‑pressure polyethylene tubular reactors.

30CrNiMo8  /  short‑term overtemperature  /  microstructure  /  mechanical properties  /  phase transformation  /  grain boundary segregation
严若梦, 黄齐飞, 张颖, 汲寿广, 杨天雪, 刘康林. 30CrNiMo8钢短时超温服役对组织和性能的影响. 压力容器, 2026 , 43 (1) : 9 -16 . DOI: 10.3969/j.issn.1001-4837.2026.01.002
Ruomeng YAN, Qifei HUANG, Ying ZHANG, Shouguang JI, Tianxue YANG, Kanglin LIU. Effect of short‑term overtemperature service on microstructure and properties of 30CrNiMo8 steel[J]. Pressure Vessel Technology, 2026 , 43 (1) : 9 -16 . DOI: 10.3969/j.issn.1001-4837.2026.01.002
Appendix
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Year 2026 volume 43 Issue 1
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Article Info
doi: 10.3969/j.issn.1001-4837.2026.01.002
  • Receive Date：2025-04-03
  • Online Date：2026-10-23
  • Published：2026-01-30
Article Data
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History
  • Received：2025-04-03
  • Revised：2025-11-13
Affiliations
    1The Fourth Research and Design Engineering Corporation of CNNC，Shijiazhuang 050021，China
    2College of Chemical Engineering，Fuzhou University，Fuzhou 350116，China
    3Changzhou University，Changzhou 213164，China
    4PetroChina Daqing Petrochemical Company，Daqing 163714，China
    5Fujian Special Equipment Inspection and Research Institute，Fuzhou 350008，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
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
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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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