ZJ series of crossover joint

Crossover joint is one of the most important part the drill string, which act as connection, conversion and transmission torque in drilling tools with different specifications. It is made of high strength chromium molybdenum steel. Its Joint threaded surface is phosphatized or copper plated. Crossover joints are divided into three types according to appearance and usage: Same-diameter type: a transition joint with only one OD, Different-diameter type: a transition joint with two OD, Levorotatory type: connecting thread of the convert joints with levorotatory form. Mechanical performance OD rangeYield strength MPaTensile strength MPaelongation %brinell hardness HBCharpy impact energy Jmmin79.4 196.431/8 73/4≥760≥965≥13≥285≥54203.2 279.48 11≥690≥930≥13≥277≥54