Failure analysis of 20CrMnTi steel rotary drilling rig square head

doi:10.13251/j.issn.0254-6051.2024.08.050

Abstract

Abstract: 20CrMnTi steel rotary drilling rig square head was fractured after use for 30 days. Failure analysis was conducted through fracture morphology observation, chemical composition analysis, mechanical properties and microstructure analysis. The results show that both the design criterion and the heat treatment process are not so rational, which leads to decreased strength and hardness of the square head. Overload fracture is easy to occur at the stress concentration area of the square head under the action of torsional stress during the using. When the P element content exceeds the standard requirement, the material has a tendency towards cold brittleness, showing brittle fracture. The quality inspection of raw materials should be strengthened to meet the standard requirements. Quenching and low-temperature tempering should be adopted to ensure that the strength and hardness of the square head material meet the technical requirements.

Key words: rotary drilling rig square head, 20CrMnTi steel, failure analysis

CLC Number:

TG162.7

Zhang Junhua, Zhou Dapeng, Yu Yonghao, Kang Xueqin. Failure analysis of 20CrMnTi steel rotary drilling rig square head[J]. Heat Treatment of Metals, 2024, 49(8): 301-304.

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