S355 steel: Yield Strength & Tensile Strength

What is S355 steel?

S355 steel is a non-alloy European standard (EN 10025-2) structural steel, most commonly usedafter S235 where more strength is needed. It got great weldability and machinability.

S355 steel Yield Strength

S355 steel is named based on it's minimum yield strength of 355 Mpa (N/mm2), However the yield strength reduces when you go up in thickness above 16 mm for flat products & hollow sections

Here is the table showing reduction in yield strength based on thickness

Up to 16 mm - 355 Mpa

16 mm < t ≤ 40 mm - 345 Mpa

40 mm < t ≤ 63 mm - 335 Mpa

63 mm < t ≤ 80 mm - 325 Mpa

80 mm < t ≤ 100 mm - 315 Mpa

100 mm < t ≤ 150 mm - 295 Mpa

S355 steel Tensile Strength

S355 ultimate tensile strength ranges also varies based on thickness.

Up to 3 mm - 510 Mpa to 680 Mpa

3 mm < t ≤ 100 mm - 470 Mpa to 630 Mpa

100 mm < t ≤ 150 mm - 450 Mpa to 600 Mpa

S355 steel Equivalents

S355 EN 10025:1990 Equivalent

S355J2 →S355J2G4 (1.0577)

S355K2 →S355K2G4 (1.0596)

S355 DIN 17100 Equivalent

S355J0 →St 52-3 U

S355J2G3 →St 52-3 N

S355 ASTM Equivalent

S355 →A572 Grade 50 (Yield Strength 345 Mpa)

S355 Equivalent BS 4360 (British / Indian)

S355JR→50 B

S355J0 →50 C

S355J2G3 →50 D

S355 Chemical Composition

Designation	C %	Si %	Mn %	P%	S%	N%	Cu%
S355JR	0.24	0.55	1.6	0.035	0.035	0.012	0.55
S355J0	0.2	0.55	1.6	0.030	0.030	0.012	0.55
S355J2	0.2	0.55	1.6	0.025	0.025	-	0.55
S355K2	0.2	0.55	1.6	0.025	0.025	-	0.55