Study on Heat Treatment Process for Quenched-tempered 30Mn P110 Oil Tubing

Based on A_c1, A_c3and M_stemperatures as determined with the CCT curve of the 30Mn steel, and the heat treatment process for the quenched-tempered 27MnCr P110 pipes, the effects by the alloy elements of the 30Mn steel and the 27MnCr steel as well as the steel pipe sizes on performance of the heat treatment process are analyzed. Furthermore the comparative analysis method is used to set up the industrialized heat treatment process for the said P110 oiltubing, involving such aspects as quenching temperature, tempering temperature, holding time and cooling speed.The process parameters include quenching temperature:925℃, and walking beam cycle:32 s;tempering temperature:530℃and walking beam cycle:32 s;external spray water volume:1 300 m³/h and spraying time:12 s;and internal spray water volume:350 m³/h, and internal water spraying time:11 s.