S355JR, S355J0 and S355J2 steel plates are non-alloy structural steels specified under EN 10025-2 for hot-rolled structural products used in welded, bolted and riveted construction. The S355 designation identifies the structural steel strength class, with a minimum yield strength of 355 MPa for nominal thicknesses up to 16 mm; the specified minimum yield strength decreases as plate thickness increases.
The main difference between S355JR, S355J0 and S355J2 is their specified Charpy V-notch impact toughness: JR requires 27 J at +20°C, J0 requires 27 J at 0°C, and J2 requires 27 J at −20°C. These impact-quality designations, together with plate thickness, delivery condition, welding requirements and project specifications, determine the appropriate S355 grade for structural fabrication such as building frames, bridges, supports and other load-bearing steel components.
EN10025 European Standard Structural Steel
EN 10025 is the European standard structural steel for Hot rolled products in carbon steel. S355 grade is also defined in this standard, other than this grade there are also S235, S275, S460, S550, S620, S690 with conditions hot rolled, normalized, quenched, and tempered.
Symbols used in EN 10025
S... Structural Steel
E... Engineering Steel
355... Minimum yield strength in Mpa at 16mm test sample
...JR.. Longitudinal Charpy V-notch impacts 27J at +20℃
...J0.. Longitudinal Charpy V-notch impacts at 27J at 0℃
...J2.. Longitudinal ... impacts at 27J at -20℃
...K2.. Longitudinal ... mpacts at 40J at -20℃
...+AR Supply conditions as rolled
...+N Supply condition normalized or normalized rolled
...NL... Normalized condition Longitudinal impacts at a temperature not lower than -50℃,like S275N, S355NL.
...M... Thermomechanically rolled Longitudinal impacts at temperature not lower than -20℃
...ML... Longitudinalimpacts not lower than -50℃, like S355M, S460ML
...Q.. Quenched and tempered condition Longitudinal impacts not more than -20℃
...QL.. Not more than -40℃
...QL1.. Not more than -60℃ like S460Q, S690QL
...W.. Improved atmospheric corrossion resistance like S355J0W+AR
...P.. Greater phosphorous content (grade S355 only)
Chemical Composition S235/S275/S355JR, J0, J2 (in %)
Grade | Carbon, Max | Si, Max | Mn, Max | P, Max | S, Max | N, Max | Cu, Max |
|---|---|---|---|---|---|---|---|
S235JR, 1.0038 | 0,17 | --- | 1,40 | 0,035 | 0,035 | 0,012 | 0,55 |
S235J0, 1.0114 | 0,17 | --- | 1,40 | 0,030 | 0,030 | 0,012 | 0,55 |
S235J2, 1.0117 | 0,17 | --- | 1,40 | 0,025 | 0,025 | --- | 0,55 |
S275JR, 1.0044 | 0,21 | --- | 1,50 | 0,035 | 0,035 | 0,012 | 0,55 |
S275J0, 1.0143 | 0,18 | --- | 1,50 | 0,030 | 0,030 | 0,012 | 0,55 |
S275J2, 1.0145 | 0,18 | --- | 1,50 | 0,025 | 0,025 | --- | 0,55 |
S355JR, 1.0045 | 0,20 | 0,55 | 1,60 | 0,035 | 0,035 | 0,012 | 0,55 |
S355J0, 1.0553 | 0,20 | 0,55 | 1,60 | 0,030 | 0,030 | 0,012 | 0,55 |
S355J2, 1.0577 | 0,20 | 0,55 | 1,60 | 0,025 | 0,025 | --- | 0,55 |
Tensile Strength
EN 10025 | Yield Strength ReH Mpa Nominal Thickness mm | Tensile Strength Rm Mpa Nominal Thickness mm | |||||
|---|---|---|---|---|---|---|---|
Grade | ≤16mm | ＞16 ≤40mm | ＞40 ≤63mm | ＞63 ≤80mm | ＞80 ≤100mm | ≥3 ≤100mm | ＞100mm ≤150mm |
S235JR | 235 | 225 | 215 | 215 | 215 | 360 to 510 | 340 to 490 |
S275JR | 275 | 265 | 255 | 245 | 235 | 410 to 560 | 400 to 540 |
S355JR | 355 | 345 | 335 | 325 | 315 | 470 to 630 | 450 to 600 |
S450J0 | 450 | 430 | 410 | 390 | 380 | 550 to 720 | 530 to 700 |
Test Methods
Chemical Analysis
Mechanical Tests
Ultrosonic Testing
Retests
Our Supply Range:
Description: Carbon Structural Steel Plate EN10025
Grade: EN10025 S235 / S275 / S355JR, J0, J2
Manufacturing Types: Hot Rolled, Heat Treated
Thickness: 5 to 150 mm
Width: 0.6m to 3m
Length: 6m, 12m, customized
Surface: Natural, Painted
Packing: Standard sea packing, bundled with streel strip.
Customized cutting: Laser Cut, Plasma Cut, CNC Cut.
FAQ
Q1: Does S355 steel always have a 355 MPa minimum yield strength?
A1: No. Under EN 10025-2, 355 MPa is the specified minimum yield strength for thicknesses up to 16 mm. The minimum yield strength decreases as plate thickness increases, so thickness must be considered when checking structural design values.
Q2: Does the −20°C Charpy test for S355J2 mean a −20°C minimum service temperature?
A2: No. −20°C is the specified Charpy V-notch test temperature, not automatically the minimum design or service temperature. Material suitability must also consider section thickness, stress level, detail category and the applicable structural design specification.
Q3: Is S355JR equivalent to ASTM A572 Grade 50?
A3: Not as a direct one-to-one substitute. Both are structural steels with similar strength ranges in some thicknesses, but their chemistry, impact requirements, thickness-dependent properties and acceptance rules come from different standards. Substitution requires confirmation against the project specification and design requirements.
Q4: What is the difference between S355J2 and S355J2+N?
A4: S355J2 identifies the strength and impact-toughness quality, while +N identifies the normalized or normalized-rolled delivery condition. The +N suffix therefore describes how the steel is supplied, not a different Charpy quality grade.