Mechanical properties of spiral steel pipe and straight seam steel pipe

Spiral steel pipe and straight seam steel pipe are two common forms of welded steel pipe. Their main differences lie in the manufacturing process and weld form, which show different characteristics in terms of mechanical properties.

Mechanical properties of spiral steel pipe

Spiral steel pipe is made by spiral rolling and double-sided submerged arc welding, and has the following mechanical characteristics:

1. Weld distribution: The spiral weld is evenly distributed, which can effectively disperse external forces and enhance the compression and impact resistance.

2. Compression resistance: The weld distribution angle helps to disperse stress and is suitable for large-diameter, high-pressure transmission pipelines.

3. Fatigue resistance: The weld is uniform, the force is dispersed, and it has excellent fatigue resistance, which is suitable for long-term repeated pressure environment.

Mechanical properties of straight seam steel pipe

Straight seam steel pipe is formed by longitudinal welding and has the following characteristics:

1. Weld distribution: The weld is concentrated along the longitudinal direction, which is easy to form a stress concentration point.

2. Compression resistance: The weld is concentrated, and stress concentration is easy to occur when under pressure, and the compression resistance is lower than that of spiral steel pipe.

3. Fatigue resistance: Concentrated welds lead to poor fatigue resistance and are prone to cracks or weld damage.