Which steel materials equivalent to A709 GR 50 ?

Steel materials A709 gr 50 one common grade in ASTM specification for structural steel for bridges.In specification ASTM A709/A709M,there are steel grades a709 gr 36, a709 gr 50,a709 gr50s,a709 gr 50w,a709 gr hps 50w,a709 gr hps 70w,a709 gr hps 100w according to different strength.So what steel materials equivalent to A709 Gr 50 in Chinese specifications ? Comparasion for chemical composition and mechanical properties,Q345qC steel in chinese specifications shall be the best equivalent to A709 Gr 50 steel materials.Q345qC steel also application in bridge buildings and can resist certain atmospheric corrosion when bare and unpainting.

Xinsteel Industrial stock 4 feet and 8 feet width bridge steel plates astm a709 gr 50 in our port warehouse which can be shipping on board within 3 days.

Bridge steel grades A709GR50 vs Q345qC		Chemical composition: Heat Analysis  Max%
Standard	Grade	C	Mn	P	S	Si	Cr	Ni	Cu	N
ASTM A709/A709M	A709Gr50	0.23	1.35	0.040	0.050	0.40	/	/	/	/
GB/T 714	Q345qC	0.18	0.9-1.6	0.030	0.025	0.55	0.30	0.30	0.30	0.008
Mechanical Properties:		Thickness		Yield strength			Tensile strength
				Mpa  Min.			Mpa
ASTM A709/A709M	A709Gr50	T≤40		345			450 min.
GB/T 714	Q345qC	T≤50		345			490 min.