What does s355j2 plus n stand for?

S355J2+N is a designation for a structural steel grade that falls under the European standard EN 10025. The "S" indicates that it is a structural steel, "355" refers to the minimum yield strength of 355 MPa, "J2" signifies that the steel has good impact resistance at low temperatures, and "+N" indicates that the steel is normalized, which enhances its mechanical properties. This grade is commonly used in construction and engineering applications due to its strength and toughness.