Static CCT curve measurement and annealing processof drilling steel 23CrNi3MoA

doi:10.13251/j.issn.0254-6051.2025.03.037

Abstract

Abstract: Continuous cooling dilatometric curve of drilling steel 23CrNi3MoA was tested by using a Gleeble-3800 thermal simulator at cooling rate of 0.05-20 ℃/s, then the static continuous cooling transformation(CCT) curve of the 23CrNi3MoA was plotted. The microstructure transformation law of the drilling steel 23CrNi3MoA under different cooling rate conditions was analyzed. The results show that the Ac₁ phase transformation temperature of the 23CrNi3MoA is 713 ℃, and the Ac₃ is 774 ℃. When the cooling rate is 0.05-0.5 ℃/s, the microstructure of the tested steel is all bainite. When the cooling rate is 0.5 ℃/s, martensite appears. Starting from 1 ℃/s and over, the microstructure is all martensite. According to the phase transformation temperature of the drilling steel 23CrNi3MoA, the annealing process ranged at (Ac₁±30) ℃ can be formulated to guide the production, and a good as-annealed state structure can be obtained, so as to achieve a good hardness value range of the product.

Key words: drilling steel 23CrNi3MoA, CCT curve, annealing, hardness

CLC Number:

TG142.1

Zhang Zhixing, Wang Hailong, Wen Hui, Liu Jian, Tian Binhua, Hu Linquan. Static CCT curve measurement and annealing processof drilling steel 23CrNi3MoA[J]. Heat Treatment of Metals, 2025, 50(3): 232-236.

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