Steel S355J0WP
EN 1.8945 · also Corten A
S355J0WP (1.8945, Corten A, 09CuPCrNi-A) is a high-phosphorus weathering structural steel that develops a protective rust patina in place of a coating system.
Reference datasheet — S355J0WP is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the AR condition
S355J0WP tempers and conditions
S355J0WP is supplied in 3 conditions, soft to hard. AR is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Normalized | Choose normalized or normalizing-rolled material when thicker structural sections need uniform fine grain and better low-temperature toughness, trading a little yield (375 MPa) for 26 % elongation. | 375 | 505 | 26 | 145 HB | 8.6 % IACS |
ARDefault as hot rolled (hot-rolled plate/coil, mill edge) | Default stock condition: pick hot-rolled plate or coil with mill edge for weathering façades, sculpture, shipping containers and rail-vehicle panels at 380 MPa yield and 24 % elongation. | 380 | 510 | 24 | 150 HB | — |
Cold rolled | Pick cold-rolled, skin-passed sheet ≤3 mm for thin weathering panels and container side walls needing good surface and thickness accuracy, accepting 165 HB and only 20 % elongation. | 400 | 530 | 20 | 165 HB | 8.6 % IACS |
Supply forms, finishes and certifications
Ways S355J0WP is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
PATINA | Pre-weathered / patinated | Surface finish |
What is S355J0WP?
S355J0WP (1.8945, Corten A, 09CuPCrNi-A) is a high-phosphorus weathering structural steel that develops a protective rust patina in place of a coating system. In the as-rolled or normalized condition it provides 380 MPa yield, 510 MPa tensile strength, 24 % elongation and about 150 HB, with impact toughness verified at 0 °C; forms include plate, hot-rolled and cold-rolled coil and pre-patinated sheet. The phosphorus content restricts welding to controlled heat-input joints, and the patina only stabilises under free wet/dry cycling, not in standing water or marine salt spray. S355J2WP is the same steel qualified to −20 °C. S355J0WP has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F). S355J0WP has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 510 MPa (74 ksi) — weaker than 68% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi).
What is S355J0WP used for?
- exposed architectural steel
- railway wagons
- outdoor sculptures
- unpainted structural cladding
Advantages
- Good corrosion resistance — 35/100, better than 97% of steel grades
- Forms and bends easily — 70/100, better than 86% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
S355J0WP properties
Typical room-temperature values for S355J0WP-AR; bars are the position among steel grades.
Physical3
S355J0WP has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,460°C (2,660 °F).
Mechanical16
S355J0WP has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 510 MPa (74 ksi) — weaker than 68% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
S355J0WP is rated for continuous service to 350°C (662 °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
S355J0WP conducts electricity at 8.6 % IACS, better than 66% of steel grades.
Chemical & Environmental3
Corrosion resistance is fair (35/100), better than 97% of steel grades.
Sustainability4
Producing a kilogram of S355J0WP takes about 25 MJ of energy and emits 2.1 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 25%.
Manufacturability7
S355J0WP's machinability is good (58/100, better than 75% of steel grades); weldability good (65/100); formability very good (70/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the steel family
Yield strength against density for every steel grade FabDigit runs. S355J0WP is highlighted; hover a dot for its name, or open the interactive family chart.
Working with S355J0WP
Is S355J0WP easy to machine?
Comparable to ordinary HSLA structural steel (about 60 % of AISI 1212); coated carbide tooling at moderate cutting speeds is sufficient. The high phosphorus makes chips slightly brittle but gives good chip breaking.
Can S355J0WP be welded?
SMAW, GMAW and SAW are all usable with weathering-matched consumables such as E8018-W2 or ER80S-G. Because of the high phosphorus, control heat input and avoid highly restrained multi-pass joints; preheat 80–120 °C for thick plate or low ambient temperatures.
Can S355J0WP be formed, bent or molded?
Cold bending performance is good; sheet bend radii are normally 1.5–2.5 t, taking the larger value transverse to the rolling direction. Hot form at 900–1050 °C and avoid heavy deformation in the 200–500 °C range.
S355J0WP 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 |
|---|---|---|
| CEN 10025-5 max | ≤ 0.12 | 0.09 |
| Si | ≤ 0.75 | 0.35 |
| Mn | ≤ 1 | 0.45 |
| Phigh P drives weathering resistance; limits weldability | 0.06 – 0.15 | 0.1 |
| S | ≤ 0.04 | 0.02 |
| Cr | 0.3 – 1.25 | 0.6 |
| Cu | 0.25 – 0.55 | 0.35 |
| Ni | ≤ 0.65 | 0.25 |
| Fe | balance |
What surface finishes work on S355J0WP?
Natural wet/dry weathering or an acidic pre-rusting treatment is preferred. If painting is required, blast-clean thoroughly and use a weathering-compatible primer; do not leave the steel bare where water collects, in salt spray, or in direct contact with aluminium or galvanized parts.
Surface treatments FabDigit runs on steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Black / Phosphate
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Steel S355J0WP in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.8945
- Trade names
- Corten A
- Similar grades
- 09CuPCrNi-A
How much does S355J0WP cost?
S355J0WP is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
S355J0WP — frequently asked
What is S355J0WP used for?
S355J0WP is typically used for exposed architectural steel, railway wagons, outdoor sculptures and unpainted structural cladding. In short: classic Corten A equivalent; patinates without painting; thin-section weathering sheet.
What is the yield strength of S355J0WP?
S355J0WP has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 510 MPa (74 ksi) — weaker than 68% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is S355J0WP easy to machine?
Reasonably — machinability is rated good (58/100, better than 75% of steel grades). Comparable to ordinary HSLA structural steel (about 60 % of AISI 1212); coated carbide tooling at moderate cutting speeds is sufficient. The high phosphorus makes chips slightly brittle but gives good chip breaking.
Can S355J0WP be welded?
Yes — weldability is rated good (65/100). SMAW, GMAW and SAW are all usable with weathering-matched consumables such as E8018-W2 or ER80S-G. Because of the high phosphorus, control heat input and avoid highly restrained multi-pass joints; preheat 80–120 °C for thick plate or low ambient temperatures.
What surface finishes work on S355J0WP?
Natural wet/dry weathering or an acidic pre-rusting treatment is preferred. If painting is required, blast-clean thoroughly and use a weathering-compatible primer; do not leave the steel bare where water collects, in salt spray, or in direct contact with aluminium or galvanized parts.
Can S355J0WP be formed, bent or molded?
Cold bending performance is good; sheet bend radii are normally 1.5–2.5 t, taking the larger value transverse to the rolling direction. Hot form at 900–1050 °C and avoid heavy deformation in the 200–500 °C range.
What is the maximum service temperature of S355J0WP?
S355J0WP is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between S355J0WP-AR and S355J0WP-CR?
AR is the default condition — default stock condition: pick hot-rolled plate or coil with mill edge for weathering façades, sculpture, shipping containers and rail-vehicle panels at 380 MPa yield and 24 % elongation. CR: pick cold-rolled, skin-passed sheet ≤3 mm for thin weathering panels and container side walls needing good surface and thickness accuracy, accepting 165 HB and only 20 % elongation. Yield strength is 380 MPa in AR versus 400 MPa in CR.
How much does S355J0WP cost?
S355J0WP is a budget-cost steel ($), cheaper than about 90% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- EN 10025-5: Hot rolled products of structural steels — Technical delivery conditions for structural steels with improved atmospheric corrosion resistance — CEN (2019)
- GB/T 4171 (09CuPCrNi-A / Q355NH) — SAC (2008)
- ASTM G101 Estimating the Atmospheric Corrosion Resistance of Low-Alloy Steels — ASTM (2020)
- ASM Handbook Vol. 1: Properties and Selection — Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Weathering steel (Corten A / S355J0WP) product datasheet — European/Chinese mill datasheets (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.