High Temperature Properties of 13Cr14Co3NiMoCuNb Nitrided Steel

HUANG Changyu; HAN Shun; LI Xinyang; LI Leilei; PANG Xuedong; WANG Chunxun; LI Yong

doi:10.3969/j.issn.1674-6457.2026.03.006

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (3) : 53-63. DOI: 10.3969/j.issn.1674-6457.2026.03.006

Iron and Steel Forming

High Temperature Properties of 13Cr14Co3NiMoCuNb Nitrided Steel

HUANG Changyu^1,2, HAN Shun^1,2, LI Xinyang^1,2, LI Leilei^1,2, PANG Xuedong³, WANG Chunxun^1,2, LI Yong^1,2,*

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Abstract

The work aims to investigate the mechanical properties and fracture behavior of corrosion-resistant 13Cr14Co3NiMoCuNb steel at high temperatures to assess its high temperature service reliability. Tensile tests were conducted at various temperatures (ranging from 26-500 ℃) to systematically analyze the fracture morphology and microstructure by means of optical microscopy (OM), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD). As the temperature increased, the tensile strength and yield strength of the steel gradually decreased, while the elongation remained relatively stable. The fracture surfaces exhibited ductile characteristics, with a reduction in the number of dimples but an increase in their size at higher temperatures. Delamination cracks observed on the longitudinal side of the tensile fracture helped alleviate stress concentration and delay failure. EBSD analysis of the region adjacent to the fracture revealed severe grain deformation, a high fraction of low-angle grain boundaries, and intense dislocation activity, suggesting that the steel maintained a good strength-toughness balance at high temperatures. 13Cr14Co3NiMoCuNb steel exhibits a good strength-toughness balance at high temperatures. The decline in strength is primarily governed by thermally activated dislocation motion, while the formation of delamination cracks and substructures contributes to retarding failure. These findings demonstrate that corrosion-resistant 13Cr14Co3NiMoCuNb steel possesses promising potential for medium- to high-temperature service environments.

Key words

13Cr14Co3NiMoCuNb steel / high temperature service environment / high temperature test / tensile properties / fracture analysis / delamination fracture

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HUANG Changyu, HAN Shun, LI Xinyang, LI Leilei, PANG Xuedong, WANG Chunxun, LI Yong. High Temperature Properties of 13Cr14Co3NiMoCuNb Nitrided Steel[J]. Journal of Netshape Forming Engineering. 2026, 18(3): 53-63 https://doi.org/10.3969/j.issn.1674-6457.2026.03.006

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