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为解决石油用钢管内衬玻璃后连接螺纹强度降低导致的螺纹磨损和变形的‘乱扣’问题,对钢管螺纹进行了高频淬火+回火热处理试验。结果表明,钢管内衬玻璃在710℃长时间保温,使其发生去应力退火、碳化物球化和晶粒的轻微长大。对螺纹进行高频淬火+回火处理,恢复并提高了螺纹强度,解决了螺纹不耐磨,易变形和“乱扣”的问题。优化的高频淬火工艺参数为:输出功率50 kW;频率350 kHz,光管壁厚6 mm,螺纹齿高1.5 mm。感应圈电流30 A,相对行走速度4～5 mm/s,介质喷出压力0.1 MPa。回火采用管式电阻炉,300℃×20 min。
In order to solve the problem of “chaotic buckling” of thread wear and deformation caused by the reduction of the thread strength after connection of oil-filled steel pipe lining glass, the high-frequency quenching and tempering heat-treatment test of the steel pipe thread was carried out. The results show that the glass-lined glass is maintained at 710 ℃ for a long time, which causes stress-relief annealing, carbide spheroidization and grain growth. High-frequency quenching of the thread + tempering, recovery and improve the thread strength, to solve the thread is not wear-resistant, easy to deform and “chaos buckle” problem. Optimized induction hardening process parameters: output power 50 kW; frequency 350 kHz, light pipe wall thickness 6 mm, thread height 1.5 mm. Induction coil current 30 A, relative to the walking speed of 4 ~ 5 mm / s, media ejection pressure of 0.1 MPa. Tempering tube resistance furnace, 300 ℃ × 20 min.