S355J2+AR and S355J2+N are both different delivery states of S355J2 steel, the main difference between the two is the heat treatment method, which directly affects the performance of the steel and applications.
1. S355J2+AR (As Rolled)
Heat treatment: "AR" stands for "as rolled", meaning that the steel is hot rolled without further heat treatment.
Characteristics: The steel retains its original strength as rolled, but its toughness and ductility may be slightly lower, especially at low temperatures.
Application: Suitable for the steel toughness requirements are not high occasions, such as general structural components, building components, simple mechanical components.
2. S355J2+N (Normalized)
Heat treatment state: "N" stands for "Normalized", which is the process of heating the steel to a high temperature and then cooling it in air.
Characteristics: Normalizing makes the steel grain finer and improves its toughness, ductility and impact resistance. the mechanical properties of S355J2+N are more uniform and stable.
Application: It is more suitable for structural parts with high requirements on mechanical properties, such as bridges, heavy buildings, mechanical equipment and welded components.
3. Performance Comparison
Strength: The strength of both products belongs to S355J2 standard and is usually similar.
Toughness and ductility: S355J2+N has better toughness and ductility as a result of normalizing, especially at low temperatures.
Weldability: Both have good weldability, but S355J2+N is more stable when welding thick plates.
4. Suggestions for selection
S355J2+AR: S355J2+AR is the choice for projects with tight cost control and low toughness requirements.
S355J2+N: S355J2+N is recommended for projects with high steel properties, especially toughness and impact properties, especially where welding or fabrication of critical structural components is required.
Summarization
S355J2+AR: Suitable for general construction and mechanical applications, emphasizing cost-effectiveness.
S355J2+N: Suitable for critical structures requiring high performance, durability and safety.
The choice of steel condition depends on the needs and performance requirements of the specific project.
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