Steel S355J0W +AR (Hot rolled)
Heat-treated state · default condition
EN 1.8959 · also Corten B
Default stock condition for weathering plate, coil and sections up to ~40 mm; cheapest and most widely available.
Values for the +AR condition
Other S355J0W tempers and conditions
S355J0W is listed in 4 conditions; see the grade overview at S355J0W.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Cold rolled | Thin-gauge weathering sheet for façade cassettes, cladding and rolling-stock panels where a tight tolerance and smooth surface are needed. | 380 | 510 | 24 | 160 HB | 8 % IACS |
+ARDefaultThis page Hot rolled | Default stock condition for weathering plate, coil and sections up to ~40 mm; cheapest and most widely available. | 385 | 530 | 25 | 155 HB | 8 % IACS |
Normalized | Choose for heavier plate, uniform fine-grain structure and more reliable low-temperature toughness after hot forming. | 395 | 540 | 27 | 158 HB | 8 % IACS |
Thermomechanically controlled processed | Pick where lean chemistry (low CEV) and high toughness are wanted for welding-intensive fabrication; avoid re-heating above ~580 °C, which destroys the TMCP structure. | 405 | 520 | 26 | 155 HB | 8 % IACS |
What is S355J0W +AR?
S355J0W +AR is S355J0W heat treated to +AR — default stock condition for weathering plate, coil and sections up to ~40 mm; cheapest and most widely available. S355J0W +AR has a yield strength of 385 MPa (55.8 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 65% of steel grades. Elongation at break is 25% and the elastic modulus is 210 GPa (30.5 Msi). S355J0W +AR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F).
Advantages
- Good corrosion resistance — 30/100, better than 95% of steel grades
- Readily welded — 78/100, better than 78% of steel grades
- Forms and bends easily — 62/100, better than 78% of steel grades
- Ductile — tolerates forming and impact — 25%, better than 77% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
S355J0W +AR properties
Typical room-temperature values for S355J0W +AR; 22 are specific to this condition. Other listed values are S355J0W reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
S355J0W +AR has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,420°C (2,588 °F).
Mechanical16
S355J0W +AR has a yield strength of 385 MPa (55.8 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 65% of steel grades. Elongation at break is 25% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
S355J0W +AR is rated for continuous service to 400°C (752 °F). It conducts heat at 45 W/m·K (26 BTU/hr·ft·°F), better than 66% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
S355J0W +AR conducts electricity at 8 % IACS, better than 55% of steel grades.
Chemical & Environmental3
Corrosion resistance is poor (30/100), better than 95% of steel grades.
Sustainability4
Producing a kilogram of S355J0W +AR takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 30%.
Manufacturability6
S355J0W +AR's machinability is fair (52/100, better than 52% of steel grades); weldability very good (78/100); formability good (62/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S355J0W +AR
Is S355J0W easy to machine?
Machines like normalized C-Mn structural steel — moderately gummy, use positive-rake carbide, generous feed and coolant; expect ~55–60 % of AISI 1212 tool life and deburr well since edges rust first.
Can S355J0W be welded?
Readily weldable by SMAW/GMAW/SAW with CEV ≈ 0.40–0.47; for exposed unpainted work use weathering-matching consumables (e.g. E8018-W2, ER80S-Ni1/-W) so the weld patinates with the plate, and preheat 100–150 °C above ~30 mm or in restrained joints.
Can S355J0W be formed, bent or molded?
Cold bends readily at ≥2t–3t radius transverse to rolling; hot form 900–1050 °C followed by normalizing (+N) for full toughness, and avoid finishing below ~750 °C.
What surface finishes work on S355J0W?
Normally left bare to develop its own patina — blast-clean to remove mill scale, drain all water traps, and detail against rust run-off; if painting is required, treat as ordinary structural steel with an epoxy/PU system, and note that hot-dip galvanizing forfeits the weathering benefit.
S355J0W chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cmax, per EN 10025-5 | ≤ 0.16 | 0.12 |
| Si | ≤ 0.5 | 0.35 |
| Mn | 0.5 – 1.5 | 1 |
| Pstandard-phosphorus grade (cf. S355J0WP high-P variant) | ≤ 0.04 | 0.02 |
| Smax; ≤0.030 typical mill practice | ≤ 0.04 | 0.02 |
| Crpatina former | 0.4 – 0.8 | 0.55 |
| Cupatina former | 0.25 – 0.55 | 0.35 |
| Ni | ≤ 0.65 | 0.15 |
| Nmax; relaxed if N-binding elements present | ≤ 0.01 | 0.01 |
| Nb+V+Ti+Zroptional grain refiners / micro-alloying, sum limit | ≤ 0.15 | 0.04 |
| Fe | balance | — |
S355J0W +AR — frequently asked
What is S355J0W +AR used for?
S355J0W +AR is typically used for bridges, exposed structural frames, shipping containers and outdoor structures. In short: corten B workhorse grade; weldable in heavy sections; standard-phosphorus weathering steel.
What is the yield strength of S355J0W +AR?
S355J0W +AR has a typical yield strength of 385 MPa (55.8 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 65% of steel grades. Strength varies by condition: see the 4 listed tempers.
Is S355J0W +AR easy to machine?
Reasonably — machinability is rated fair (52/100, better than 52% of steel grades). Machines like normalized C-Mn structural steel — moderately gummy, use positive-rake carbide, generous feed and coolant; expect ~55–60 % of AISI 1212 tool life and deburr well since edges rust first.
Can S355J0W +AR be welded?
Yes — weldability is rated very good (78/100). Readily weldable by SMAW/GMAW/SAW with CEV ≈ 0.40–0.47; for exposed unpainted work use weathering-matching consumables (e.g. E8018-W2, ER80S-Ni1/-W) so the weld patinates with the plate, and preheat 100–150 °C above ~30 mm or in restrained joints.
What surface finishes work on S355J0W +AR?
Normally left bare to develop its own patina — blast-clean to remove mill scale, drain all water traps, and detail against rust run-off; if painting is required, treat as ordinary structural steel with an epoxy/PU system, and note that hot-dip galvanizing forfeits the weathering benefit.
Can S355J0W +AR be formed, bent or molded?
Cold bends readily at ≥2t–3t radius transverse to rolling; hot form 900–1050 °C followed by normalizing (+N) for full toughness, and avoid finishing below ~750 °C.
What is the maximum service temperature of S355J0W +AR?
S355J0W +AR is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between S355J0W +AR and S355J0W-CR?
+AR is the default condition — default stock condition for weathering plate, coil and sections up to ~40 mm; cheapest and most widely available. CR: thin-gauge weathering sheet for façade cassettes, cladding and rolling-stock panels where a tight tolerance and smooth surface are needed. Yield strength is 385 MPa in +AR versus 380 MPa in CR.
Sources
- EN 10025-5: Hot rolled products of structural steels — Technical delivery conditions for structural steels with improved atmospheric corrosion resistance — CEN (2019)
- ASTM A588/A588M — High-Strength Low-Alloy Structural Steel with Atmospheric Corrosion Resistance — ASTM International (2019)
- ASTM G101 — Estimating the Atmospheric Corrosion Resistance of Low-Alloy Steels — ASTM International (2020)
- GB/T 4171 — Atmospheric corrosion resisting structural steel (Q355NH) — SAC (2008)
- ASM Handbook Vol. 1: Properties and Selection — Irons, Steels, and High-Performance Alloys — ASM International (1990)
- EN 1993-1-1 / EN 1993-1-2 (Eurocode 3, elastic and thermal properties of structural steel) — CEN (2005)
- Weathering steel plate datasheets (Corten A/B, Patina, Indaten class products) — European plate mills (2023)
- (Q355NH/SPA-H) — Mysteel / 1688 (2026)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.