Material Properties of S355 Steel

S355 is a non-alloy European standard (EN 10025-2) structural steel, most commonly used after S235 where more strength is needed. It got great weldability and machinability, let us see more mechanical details of this steel.

Identification of Different S355

S - stands for structural steel

355 - stands for minimum yield strength (though it will vary based on thickness, refer below section for more details)

Normally S355 will have following variation based on impact strength at different temperatures, as steel become more brittle when temperature drops. If your structure need to withstand -20°C, it's better and safer to choose S355J2.

S355JR - Can withstand an impact energy of 27J at +20°C

S355J0 - Can withstand an impact energy of 27J at 0°C

S355J2 - Can withstand an impact energy of 27J at -20°C

S355K2 - Can withstand an impact energy of 27J at -30°C (40J at -20°C)

And sometime followed by a letter H, like S355J2H, here H stands for hollow section.

S355 Yield Strength

S355 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 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 Density

Density of S355 is 7850 kg/m3 like all other mild steel

S355 Hardness (Brinell Hardness - HB)

Hardness for S355 J2 ranges from 146 HB to 187 HB

S355 Young's Modulus

S355 Youngs's Modulus is 190 to 210 Gpa, in a conservative design go for 190 Gpa

S355 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

Labels: Engineering Materials, feature, Steel

Material Properties of S355 Steel - An Overview