S355NL is the normalized steel in EN10025-3:2004 standard (fine grain steel). The yield strength and tensile strength and low alloy steel in China Q345.NL is required to do the corresponding impact in low temperature environment of 50 degrees below zero in the absorbed energy test. And the impact value of not less than 27J.
Z25 refers to the thickness of the steel plate to do the direction of lamellar tearing performance test, the main consideration is the seismic requirements.
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