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Manufacturers of straight seam steel pipes typically enhance their performance by adding alloys to the material. After cold drawing, stress annealing is necessary to eliminate residual stress and prevent fractures. In China, manufacturers increase metal strength through cold drawing, which compromises the metal鈥檚 shape and toughness.

Cold-drawn straight seam steel pipes are valued for their high dimensional accuracy and strength. To maximize performance and minimize adverse effects, deformation must be kept within a specific range. The axial direction of cold-drawn pipes aligns with the elongation direction of the grains, while the strength is perpendicular to the grain elongation direction. However, the maximum stress in hydraulic cylinders is in the radial direction of the pipe, meaning excessive deformation can reduce performance.

Excessive deformation reduces the plasticity and toughness of the pipes, elongates the grains too much to form a fibrous structure, and introduces noticeable anisotropy. Insufficient deformation fails to meet the flatness, dimensional accuracy, and strength requirements of the components.