Q345D steel is EN S355J2 equivalent grade in China

EN S355J2 is a medium tensile, low carbon manganese steel in EN10025-2 with low alloy. EN S355J2 is readily weldable and possess good impact resistance. J2 means doing charpy V-notch impacting test at -20℃. Q345D steel is EN S355J2 equivalent grade in China. Below is comparison between Q345D steel and EN S355J2.

EN S355J2 equivalent grade Q345D steel chemical composition:

Grade	C	Si	Mn	P	S	Nb	V	Ti	Cr	Ni	Cu	N	Mo	Als
S355J2	0.24	0.60	1.70	0.035	0.035							-
Q345D	0.18	0.50	1.70	0.030	0.025	0.07	0.15	0.20	0.30	0.5	0.30	0.012	0.1	Min. 0.015

EN S355J2 equivalent grade Q345D steel yield strength:

Grade	Yield strength ReH/(N/mm2) (t≤16mm) min
	≤ 16	> 16 ≤ 40	> 40 ≤ 63	> 63 ≤ 80	> 80 ≤ 100	> 100 ≤ 150	> 150 ≤ 200	> 200 ≤ 250	> 250≤ 400
S355J2	355	345	335	325	315	295	285	275	265
Q345D	345	335	325	315	305	285	275	265	265

EN S355J2 equivalent grade Q345D steel tensile strength:

Grade	Tensile strength Rm/(N/mm2) (3mm≤t≤16mm)
	≤ 40	> 40 ≤ 63	> 63 ≤ 80	> 80 ≤ 100	> 100 ≤ 150	> 150 ≤ 250	> 250≤ 400
S355J2	510-680	470-630	470-630	470-630	450-600	450-600	450-600
Q345D	470-680	470-630	470-630	470-630	450-600	450-600	450-600

EN S355J2 equivalent grade Q345D steel elongation:

Grade	Elongation A/%(t≤40mm) min
	> 3 ≤  40	> 40 ≤ 63	> 63 ≤100	> 100 ≤ 150	> 150 ≤ 250	> 250≤ 400
S355J2	22	21	20	18	17	-
Q345D	21	20	20	19	18	17

EN S355J2 equivalent grade Q345D steel Charpy V test:

Grade	Temperature	Impact energy (Longitudinal)/J min
	℃	≤ 150	> 150 ≤ 250	> 250≤ 400
S355J2	-20℃	27	27	27
Q345D	-20℃	34	27	27

The performance of Q345D steel and EN S355J2 are similar even in impact temperature, it is no wonder that Q345D steel is EN S355J2 equivalent grade in China. EN S355J2 steel is commonly supplied in the untreated or normalized condition. The normalized grade is known as S355J2+N.