What are the main differences between S355JR and S235JR materials?
The main difference lies in their strength. S355JR has a higher strength than S235JR, with a minimum yield strength of 355 MPa, while S235JR has 235 MPa. This makes S355JR more suitable for heavy-duty applications, while S235JR is more economical and better suited for lightweight structures.
What are the commonly used welding processes for S355JR welded structural steel pipes?
Common welding processes for S355JR steel pipes include submerged arc welding (SAW), flux-cored wire arc welding (FCAW), and manual arc welding (SMAW). Submerged arc welding is often used for welding long seams in large pipelines.
What are the typical application areas of S355JR welded structural steel pipe?
S355JR welded Structural unalloyed steel has a wide range of applications in construction, metallurgy, heavy and transport engineering, machine tool, power engineering and bridge building industries. Various profiles and metal structures, parts and elements of ground and underground equipment are made from steel S355JR.
What are the main mechanical properties of S355JR welded structural steel pipe?
The main mechanical properties of S355JR welded structural steel pipe include: minimum yield strength of 355 MPa (wall thickness not exceeding 16 mm), tensile strength between 470 MPa and 630 MPa, and minimum elongation of 22%.
What is the dimensional tolerance range for S355JR welded structural steel pipes?
The dimensional tolerances of S355JR welded structural steel pipes are not defined by a single numerical value, but depend on the specific standards and dimensions. For example, for hollow profiles such as S355JRH (similar grades), common standards specify a wall thickness tolerance of ±10% or conform to EN 10210-2, with dimensional tolerances of ±1% or as required by the Steel Union Group. For flat materials (steel plates), the thickness tolerance will also vary with the nominal thickness.
