Seamless steel pipe for oil-gas well perforating gun and manufacturing method thereof

• Main Authors: DANG GANG, MENG FANLEI, SHAO HUIYONG, LI YINGXIONG, CAI ZHIBO, ZHANG WEIDONG, HU BIN
• Format: Patent
• Language: Chinese; English
• Published: 28.07.2020
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to a seamless steel pipe for an oil-gas well perforating gun and a manufacturing method thereof. The seamless steel pipe comprises the following chemical components in percentageby mass of 0.30%-0.34% of C, 0.17%-0.37% of Si, 0.60%-0.75% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 1.00%-1.20% of Cr, 0.20%-0.30% of Mo, 0.020%-0.045% of Als, less than or equal to 0.30% of Ni, less than or equal to 0.20% of Cu and the balance Fe and other unavoidable elements. According to the seamless steel pipe and the manufacturing method, a ''turning-onsteelmaking + LF refining + VD vacuum refining + continuous rolling unit rolling + heat treatment'' process is adopted, the steelmaking process is reasonable, steel is pure, inclusion is few, the component control is accurate, the pipe making process is advanced, the steel pipe geometry is good, and the performance is stable. 本发明涉及一种油气井射孔枪用无缝钢管及其制造方法，所述无缝钢管的化学成分按质量百分比计为：C 0.30％～0.34％，Si 0.17％～0.37％，Mn 0.60％～0.75％，P≤0.015％；