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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