Mechanical processing of high aspect ratio metallic tubing and related technology

A method, comprising:

• longitudinally aligning an elongate pushrod, a mandrel, and an elongate metal tube having a longitudinal bore and an annular wall extending around the bore, wherein the mandrel is either separate from the pushrod or part of the pushrod;
• gripping a portion of a side surface of the tube;
• gripping a portion of a side surface of the pushrod;
• and
• decreasing a distance between the portion of the side surface of the tube and the portion of the side surface of the pushrod to advance the mandrel distally within the bore, thereby
• expanding an inner diameter of the bore without expanding an outer diameter of the tube,
• inducing residual longitudinal and tangential compressive stress at an inner portion of the wall, and
• inducing residual longitudinal and tangential tensile stress at an outer portion of the wall.