Equivalent steel grades to astm a572 grade 50 ?

Which steel grades equivalent to astm a572 grade 50 ? Xinsteel Industrial suggest you using steel grades EN 10025-2 S355JR,DIN 17100 St50-2,GB/T 1591 Q345B or Q355B.These steel materials are all low alloy high strength for structural buildings.Steel materials a572gr50 normally supplied typies as a572gr50 angle bars,a572gr50 round bars,a572gr50 steel plate,a572gr50 steel coils,a572gr50 beams.

Comparasion of A572GR50 and BS S355JR as below table,these two grades owned the similar mechincal properties,in Chemical composition,steel materials S355JR need lower percentage for P% and S%,but only a very little gap with steel mterials A572GR50.A572 standard specification is for high strength low alloy with Columbium-Vanadium structural steels,so A572 grade 50 shall be added alloy content Columbium-Vanadium comply to specification ASTM A572/A572M TYPE 1,2,3 or 4.
 

Steel grades S355JR vs A572GR50		Chemical composition: Heat Analysis  Max%
Standard	Grade	C	Mn	P	S	Si	N	Cu
EN 10025-2	S355JR	0.24	1.60	0.035	0.035	0.40	0.012	0.55
ASTM A572/A572M	A572Gr50	0.23	1.35	0.04	0.05	0.55	0.012	/
Mechanical Properties:		Thickness		Yield strength		Tensile strength
				Mpa  Min.		Mpa
EN 10025-2	S355JR	T≤16		355		470-630
ASTM A572/A572M	A572Gr50	T≤40		345		450 Min.