Difference Din St50-2 and GB Q355B steel

DIN 17100 St50-2 and GB/T 1591 Q355B steels both are low alloy high strength steel materials.Chinese steel specifications change old steel grade Q345B to Q355B following international specifications such as BS EN 10025-2 S355JR,in new version standard GB/T 1591,all grades Q345 changed to Q355.

Comparasion din St50-2 and new chinese grade Q355B,Q355B steel materials owned higher strength in yield and tensile than St50-2 and also have tight control for elements P% and S% when rolling.So Q355B steels have a higher strength and anti-corrossion when using than DIN 17100 St50-2 steel materials.St50-2 steel materials mostly rolled as St50-2 round bars,St50-2 Rebars,St50-2 seamless steel pipes,St50-2 welded steel pipes,etc.

Carbon steel grades St50-2 vs Q355B		Chemical composition: Heat Analysis  Max%
Standard	Grade	C	Mn	P	S	Si	N
DIN 17100	St50-2	0.30	1.70	0.060	0.060	0.60	0.010
GB/T 1591	Q355B	0.24	1.60	0.035	0.035	0.55	0.012
Mechanical Properties:		Thickness		Yield strength		Tensile strength
				Mpa  Min.		Mpa
DIN 17100	St50-2	T≤16		295		470-610
GB/T 1591	Q355B	T≤16		355		470-630