S235JR, S275JR, S355JR and S355JO are all structural steel grades in the European standard (EN10025). Their main differences are strength grade and impact toughness. The following are the general uses of these steels:
S235JR: With a strength grade of 235MPa, it has good bearing capacity and earthquake resistance, and is suitable for general building structures and bridges, etc., which can effectively improve the structural safety and stability of buildings.
S275JR: It is a low-alloy high-strength structural steel with moderate strength and good processing performance. It is widely used in a variety of construction and structural engineering, such as heavy machinery.
S355JR: It has high strength, good toughness and weldability, and is often used in buildings, bridges, ships, vehicles and other fields.
S355JO: Similar to S355JR, but may have different impact toughness and chemical composition requirements, and the specific uses may be slightly different.
It should be noted that these uses are based on their general characteristics, and the specific applications may vary according to design requirements and engineering needs. When selecting steel, the most suitable material should be determined based on specific usage conditions and technical requirements.
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