Equivalent steel grades bs en S355JR VS Q355B

Q355B is a new steel grade in latest version chinese steel standard GB/T1591-2018,before this version,Q355B steel called as Q345B in GB/T1591.S355JR steels from European British steel standard BS EN10025-2 low alloy high strength steels.These two steel materials Q355B and S355JR are totally equivalent in chemical composition and mechincal properties from the following comparasion data table.

S355JR steel grade can write as S355JR+AR,S355JR+N,S355JR+AR means S355jr steel materials rolled under As rolled,hot rolled.S355JR+N means S355JR steel materials rolled with heat treatment Normalized,Normalising.Normalized heat treating can approve uniformity in S355JR steel’s grain size and microstructure.

Also,S355JR steel materials equivalent to ASTM A572 Grade 50,DIN 17100 St50-2,JIS G3101 SS540.

Carbon steel grades S355JR vs Q355B		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	0.55	0.012	0.55
GB/T 1591	Q355B	0.24	1.60	0.035	0.035	0.55	0.012	0.40
Mechanical Properties:		Thickness		Yield strength		Tensile strength
				Mpa  Min.		Mpa
EN 10025-2	S355JR	T≤16		355		470-630
GB/T 1591	Q355B	T≤16		355		470-630