Evolution of microstructure and mechanical properties of cold-drawn small-caliber 16MnNiV seamless steel tube

LI Han; LI Zhaodong; CAO Jie; ZHANG Ke; CAO Yanguang; YONG Qilong

doi:10.11868/j.issn.1001-4381.2022.001037

Cailiao gongcheng (Sep 2023)

Evolution of microstructure and mechanical properties of cold-drawn small-caliber 16MnNiV seamless steel tube

LI Han,
LI Zhaodong,
CAO Jie,
ZHANG Ke,
CAO Yanguang,
YONG Qilong

Affiliations

LI Han: School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243032, Anhui, China
LI Zhaodong: Department of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China
CAO Jie: School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243032, Anhui, China
ZHANG Ke: School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243032, Anhui, China
CAO Yanguang: Department of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China
YONG Qilong: Department of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China

DOI: https://doi.org/10.11868/j.issn.1001-4381.2022.001037
Journal volume & issue: Vol. 51, no. 9
pp. 117 – 127

Abstract

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16MnNiV steel is developed from 16Mn and 16MnV steel. After hot-perforated rolling into tube, cold rolling, cold drawing and heat treatment are carried out to prepare high pressure tubes with high caliber. The microstructure and mechanical properties of 16MnNiV seamless steel tube of small diameter were studied by means of optical microscopy (OM), scanning electron microscopy (SEM), electron backscattering diffraction (EBSD), transmission electron microscopy (TEM) and physicochemical phase analysis. The microstructure and the change of the second phase precipitation were revealed, and the strengthening increment was calculated. The relevant results can provide a reference for the material development and performance improvement of high strength high pressure tubes. The results show that the main structure of the experimental steel in the process of drawing the tube is ferrite and pearlite. In the case of precipitation, annealing after one pull increases the total amount of precipitation, and annealing after the second pull does not change the total amount of precipitation. It is known from EDS analysis that the precipitated second phase particle is VC. The tensile strength and yield strength of the experimental steel are gradually increased and the elongation rate decreases after cold drawing and different heat treatment processes. It can be seen that the increase of yield strength of experimental steel mainly comes from the contribution of fine crystal reinforcement due to the large deformation of cold extraction process. After heat treatment, the tensile strength, yield strength and elongation rate of ϕ6.35 mm×3 mm round tubes reach over 960, 864 MPa and 15.5%. Compared with other high pressure tubing products of 16Mn series, the mechanical properties are greatly improved and good strong plastic matching is obtained.

Published in Cailiao gongcheng

ISSN: 1001-4381 (Print)
Publisher: Journal of Materials Engineering
Country of publisher: China
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: http://jme.biam.ac.cn/CN/1001-4381/home.shtml

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