What is different for S355J2 steel plate and S355NL steel plate

What is different for S355J2 steel plate and S355NL steel plate ?

Firstly S355J2 steel plate rolling from steel specification EN 10025-2,and S355NL steel plate rolling from steel specification EN 10025-3 hot rolled structural steels with Normalized or Normalized rolled technical delivery conditions.This means S355J2 can be offered without Normalized heat treatment,but S355NL have to be offered with Normalized heat treatment or Normalized rolled condition.

In the second,S355J2 steel plate shall be done charpy impacting test at low temperature minus 20 Degree Celsius,but S355NL steel plate shall be done this test at low temperature minus 50 Degree Celsius with minimum impact energy value 27J on longitudinal.

As for chemical composition and mechanical properties for S355J2 steel plate and S355NL steel plate,you can check from the below table:
 

S355NL vs S355J2		Chemical composition: Heat Analysis  Max%
Standard	Grade	C	Mn	P	S	Si	V	Alt min.	Ti	Cr	Ni	Mo	Cu	N
EN 10025-3	S355NL	0.18	0.90-1.65	0.025	0.020	0.50	0.12	0.02	0.05	0.30	0.30	0.10	0.55	0.015
EN 10025-2	S355J2	0.20	1.60	0.025	0.025	0.55							0.55
Mechanical Properties:		Thickness		Yield strength				Tensile strength
				Mpa  Min.				Mpa
EN 10025-3	S355NL	T≤16		355				470-630
EN 10025-2	S355J2	T≤16		355				470-630