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顶驱旋塞阀阀体是顶部驱动装置的重要部件,需适应低温工作环境,主要承受大扭矩冲击载荷。API spec7规范对顶驱旋塞阀阀体-20℃低温冲击吸收功AKV要求:3个纵向的-20℃冲击吸收功AKV平均值≥42 J,AKV单个值≥32 J(试件取自阀体最厚截面1/2壁厚处),对其它力学性能的要求如表1所示。普通调质钢采用油淬调质工艺很难满足API spec7规范
Top-drive cock valve body is an important part of the top drive, to adapt to low-temperature work environment, mainly to withstand large torque impact load. API spec7 Specification Top Drive Plug Valve Body -20 ℃ Low Temperature Impact Absorption AKV Requirements: 3 Longitudinal -20 ℃ Impact Absorption AKV Average ≥42 J, AKV Individual Value ≥32 J (Specimen taken from body The thickest section 1/2 wall thickness), the requirements of other mechanical properties are shown in Table 1. Ordinary quenched and tempered steel quenching process with oil hard to meet API spec7 specifications