S355 steel plate S355 grade steel is a medium tensile, low carbon manganese steel which is readily weldable and possesses good impact resistance (also in sub-zero temperatures).S355 High Strength Structural Steel Plates are high strength, low alloy steel plates falling under the EN 10025: 2004 European standard. It offers minimum yield strength of 50 ksi and a minimum tensile strength of 470-630 Mpa; it is a low carbon structural steel plate with marvellous usability.

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EN 10025 S355 Steel

S355 steel is a European standard structural steel grade, according to EN 10025-2: 2004, material S355 is divided into 4 main quality grades:

S355JR (1.0045),
S355J0 (1.0553),
S355J2 (1.0577) and
S355K2 (1.0596).

The properties of structural steel S355 is better than steel S235 and S275 in yield strength and tensile strength.

Steel Grade S355 Meaning (Designation)

The following letters and numbers explains the steel grade S355 meaning.

“S” is short for “structural steel”
“355” refers to the minumum yield strength value for the flat and long steel thickness ≤ 16mm.
“JR” means the impact energy value is minumum 27 J at room temperature (20℃).
“J0” can withstand the impact energy at least 27 J at 0℃.
“J2” related to the minumum impact energy value is 27 J at -20℃.
“K2” refers to the minumum impact energy value is 40 J at -20℃.

Chemical composition & Mechanical property

Datasheet and Specification

Below are the tables to show the steel grade S355 datasheet including chemical composition, yield strength, tensile strength and elongation, etc. All data sheet of DIN EN 10025-2 is the same as BS EN 10025-2 and other EU member states.

Chemical Composition

The datasheet below shows grade S355 steel chemical composition.

			S355 Chemical Composition % (≤)
Standard	Steel	Grade	C	Si	Mn	P	S	Cu	N	Method of deoxidation
EN 10025-2	S355	S355JR	0.24	0.55	1.60	0.035	0.035	0.55	0.012	Rimmed steel is not allowed
		S355J0 (S355JO)	0.20	0.55	1.60	0.030	0.030	0.55	0.012	Rimmed steel is not allowed
		S355J2	0.20	0.55	1.60	0.025	0.025	0.55	–	Fully killed
		S355K2	0.20	0.55	1.60	0.025	0.025	0.55	–	Fully killed

Mechanical Properties

The datasheet below gives EN 10025 S355 steel mechanical properties such as yield strength, tensile strength and elongation.

Yield Strength

		S355 Yield Strength (≥ N/mm2); Dia. (d) mm
Steel	Steel Grade (Steel Number)	d≤16	16< d ≤40	40< d ≤63	63< d ≤80	80< d ≤100	100< d ≤150	150< d ≤200	200< d ≤250
S355	S355JR (1.0045)	355	345	335	325	315	295	285	275
	S355J0 (1.0553)
	S355J2 (1.0577)
	S355K2 (1.0596)

Tensile Strength

		S355 Tensile Strength (≥ N/mm2)
Steel	Steel Grade	d<3	3 ≤ d ≤ 100	100 < d ≤ 250
S355	S355JR	510-680	470-630	450-600
	S355J0 (S355JO)
	S355J2
	S355K2

Elongation

		Elongation (≥%); Thickness (d) mm
Steel	Steel Grade	3≤d≤40	40< d ≤63	63< d ≤100	100< d ≤ 150	150< d ≤ 250
S355	S355JR	22	21	20	18	17
	S355J0 (S355JO)
	S355J2
	S355K2	20	19	18	18	17

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