What are the main production processes for S355J2H longitudinally welded steel pipe?
The main production processes for S355J2H longitudinally welded steel pipe are resistance welding (ERW) and submerged arc welding (SAW), typically using steel plates or strips rolled into cylindrical shapes as raw materials.
Which welding methods are suitable for S355J2H longitudinally welded steel pipe?
Welding methods suitable for S355J2H longitudinally welded steel pipe include resistance welding (ERW), high-frequency induction welding (HFIW), and submerged arc welding (SAW).
In which engineering fields is S355J2H longitudinally welded steel pipe mainly used?
Longitudinally welded steel pipe has excellent pressure resistance, deformation resistance, and long service life, making it the preferred material for high-requirement engineering projects. Its main application areas include: onshore and offshore oil and gas pipelines; mining and industrial transportation; high-wear-resistant slurry pipelines; process piping systems; large-scale infrastructure marine engineering; building structures; and trunk water supply networks.
What are the heat treatment processes for S355J2H longitudinally welded steel pipe?
The commonly used heat treatment processes for S355J2H longitudinally welded steel pipes are normalizing and stress-relief annealing. Normalizing involves heating the steel pipe above its critical temperature and then cooling it in air. Stress-relief annealing involves heating the steel pipe to a temperature of approximately 580-630℃ to reduce internal stress.
What are the advantages of S355J2H longitudinally welded steel pipes compared to spiral welded steel pipes?
S355J2H longitudinally welded steel pipes have higher burst strength, making them the preferred choice for high-pressure applications such as oil and gas pipelines; while spiral welded steel pipes are more cost-effective in large-diameter applications and are more suitable for low-pressure applications such as pile foundations. The straight weld seam of the longitudinal pipe has higher burst strength, while the spiral weld seam of the spiral pipe can more evenly bear and disperse stress, making it an ideal choice for certain structural applications.
