Residual Stress Control in Seamless Pipe Manufacturing

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.

• Aerospace hydraulic tubing.
• Deepwater oil and gas pipelines.