Residual stress is a critical factor in seamless pipe performance, especially in high-pressure and high-temperature environments. Improper stress management can lead to cracking, warping, or reduced fatigue life.

Causes of Residual Stress in Seamless Pipes:

Non-uniform cooling rates during heat treatment.
Cold deformation in pilgering or drawing processes.
Phase transformation stress in alloyed steels.

Methods for Residual Stress Reduction:

Post-manufacturing annealing: Relieves stress via slow cooling.
Shot peening: Introduces compressive stress to counteract residual tensile stress.
Cryogenic treatment: Enhances dimensional stability in precision applications.

Applications Where Stress Control Is Critical:

Aerospace hydraulic tubing.
Deepwater oil and gas pipelines.