In the European standard EN10025-2 standard, many people will confuse that 2 kinds of grade, and there is no difference. These two grades are S355J2 and S355K2.

The components of S355J2 and S355K2 are exactly the same, the yield is 355MPa, and other properties are also the same. However, it should be noted that the S355J2 requires 27J for impact energy at -20 degrees Celsius, while the S355K2 requires 40J. The standard stipulates that when the thickness of the steel product exceeds 150mm, the requirement of S355J2 is still 27J, while the requirement of S355K2 is 33J, but the rolling material with a thickness of more than 150mm in our common products is too rare, so the requirement of S355K2 is 40J.