... frequency heat treatment, numerical control lathe and compete set of ultrasonic inspection and magnetic particle inspection. The whole process includes ... hot upset forging, heat treatment, hot straightening, could straightening, ultrasonic inspection on pipe body and pipe end, magnetic particle inspection ... 2” of label 1 or 60.32mm to 139.7mm3) Wall thickness:6.45 to 12.7mm4) Grade:E75,X95,G105,S1355 ...