S355 / Equivalents

Is it really S355? 11 “equivalents” checked

Cross-reference tables pair grades by name and history. Here each pairing is judged on the minimum values each standard guarantees, with the sources for both sides.

Close match

Same strength class; guaranteed values agree within a few MPa. Still check thickness bands and impact quality.

St 52-3DIN
С355GOST
Q355SAC (GB)
SM520JIS

Approximate

Same class of steel, but at least one guaranteed value is lower or tested differently. Recheck the design.

A992ASTM
A572 Grade 50ASTM
350WCSA
Grade 350Standards Australia
E350BIS

Not equivalent

Commonly listed as an equivalent, but the guaranteed values do not support substitution.

SM490JIS
09G2S (09Г2С)GOST

Side by side

Grade	Standard	Min. yield at 10 mm	Tensile at 10 mm	Match	What differs
S355	EN 10025-2:2019	≥ 355MPa7	470–630MPa9	—	Reference grade.
St 52-3	DIN 17100(withdrawn)	not verified	not verified	Close match	The withdrawn German predecessor. Same strength class; designations on old drawings map to S355J2.
С355	GOST 27772-2015	≥ 355MPa1	≥ 470MPa1	Close match	Same yield steps as S355 up to 100 mm (355/345/335/325/315 MPa) per GOST 27772 Table 4; tensile 470 MPa minimum with no upper limit, and the table starts at 8 mm.
Q355	GB/T 1591-2018	≥ 355MPa3	470–630MPa2	Close match	China's direct counterpart since GB/T 1591-2018 renamed Q345 to Q355. Q355B/C/D test 34 J where S355JR/J0/J2 test 27 J; thickness bands and chemistry differ.
SM520	JIS G 3106	≥ 365MPa1	520–640MPa2	Close match	Matches S355's yield (365 MPa ≤ 16 mm, 355 MPa 16–40 mm) with a higher tensile range, 520–640 MPa.
A992	ASTM A992/A992M	≥ 345MPa2	≥ 450MPa2	Approximate	The US wide-flange grade: 345 MPa (50 ksi) yield, 450 MPa tensile, with a yield-to-tensile cap of 0.85 for ductility.
A572 Grade 50	ASTM A572/A572M	≥ 345MPa4	≥ 450MPa4	Approximate	Minimum yield 345 MPa (50 ksi), 10 MPa below S355; minimum tensile 450 MPa (65 ksi) with no upper limit. No impact test unless ordered as a supplement.
350W	CSA G40.21	≥ 350MPa2	450–655MPa2	Approximate	Yield 350 MPa (50 ksi), 5 MPa below S355, and only 46 ksi above 2½ in.; tensile 65–95 ksi. W has no guaranteed impact test; 350WT adds it.
Grade 350	AS/NZS 3678:2016	≥ 360MPa2	≥ 450MPa2	Approximate	Yield bands differ (360 MPa up to 12 mm, then 350 and 340). Minimum tensile 450 MPa, below S355's 470.
E350	IS 2062:2011	≥ 350MPa1	≥ 490MPa1	Approximate	Yield 350 MPa for the thinnest band, 5 MPa below S355; minimum tensile 490 MPa, above S355's 470.
SM490	JIS G 3106	≥ 325MPa2	490–610MPa3	Not equivalent	Usually listed as the JIS equivalent, but its guaranteed yield is 325 MPa — 30 MPa (8 %) below S355. Fine as a tensile-class match, not for yield-governed design.
09G2S (09Г2С)	GOST 19281-2014	≥ 265MPa1	≥ 430MPa1	Not equivalent	A chemistry grade, not a strength class: under GOST 19281-2014 it is supplied from strength class 265 upwards. Only a certificate stating class 345 or higher comes close.