Steel S355J2WP
EN 1.8946 · also Corten A
S355J2WP (1.8946, Corten A, 09CuPCrNi-A) is a high-phosphorus atmospheric-corrosion-resistant structural steel from the same composition family as S355J0WP, but qualified for impact toughness at −20 °C.
Reference datasheet — S355J2WP 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
S355J2WP tempers and conditions
S355J2WP 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 when uniform fine-grain structure and reliable low-temperature toughness margin above the 27 J/−20 °C minimum are required. | 385 | 525 | 26 | 150 HB | 7.5 % IACS |
+ARDefault Hot rolled | Default stock condition for weathering plate, coil and strip up to ~12–16 mm; pick unless a normalized certificate is demanded. | 390 | 530 | 24 | 155 HB | 7.5 % IACS |
Cold rolled | Sub-3 mm decorative sheet for facade panels and signage; higher strength, reduced ductility, needs care on tight bends. | 440 | 570 | 18 | 175 HB | 7.5 % IACS |
Supply forms, finishes and certifications
Ways S355J2WP is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
HR-Coil | Hot-rolled coil / strip | Supply form |
Pre-weathered | Pre-weathered / factory pre-rusted surface | Surface finish |
What is S355J2WP?
S355J2WP (1.8946, Corten A, 09CuPCrNi-A) is a high-phosphorus atmospheric-corrosion-resistant structural steel from the same composition family as S355J0WP, but qualified for impact toughness at −20 °C. Typical values are 390 MPa yield, 530 MPa tensile strength, 24 % elongation and about 155 HB; product forms include +AR and +N plate, hot-rolled coil, cold-rolled sheet and pre-weathered material. The 0.06–0.15 % phosphorus raises hot-cracking risk, so welding is practical mainly in sections up to 12 mm. Where heavier welded sections are required, standard-phosphorus S355J0W (Corten B) is the usual substitute. S355J2WP has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F). S355J2WP has a yield strength of 390 MPa (56.6 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 64% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi).
What is S355J2WP used for?
- exposed structural steelwork in cold climates
- bridges
- railway hopper cars
- architectural facades
Advantages
- Good corrosion resistance — 35/100, better than 97% of steel grades
- Easy to machine — 62/100, better than 89% of steel grades
- Forms and bends easily — 70/100, better than 86% of steel grades
Limitations
- Hard to polish — 40/100, worse than 96% of steel grades
S355J2WP properties
Typical room-temperature values for S355J2WP-+AR; bars are the position among steel grades.
Physical3
S355J2WP has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,450°C (2,642 °F).
Mechanical16
S355J2WP has a yield strength of 390 MPa (56.6 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 64% of steel grades. Elongation at break is 24% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
S355J2WP 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 12.2 µm/m·K (6.78 µin/in·°F).
Electrical3
S355J2WP conducts electricity at 7.5 % IACS, worse than 67% of steel grades.
Chemical & Environmental3
Corrosion resistance is fair (35/100), better than 97% of steel grades.
Sustainability4
Producing a kilogram of S355J2WP 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
S355J2WP's machinability is good (62/100, better than 89% of steel grades); weldability fair (50/100); 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. S355J2WP is highlighted; hover a dot for its name, or open the interactive family chart.
Working with S355J2WP
Is S355J2WP easy to machine?
Machines like a 355 MPa HSLA steel; high phosphorus gives clean chip breaking, but tool wear rises slightly from Cr/Cu — use coated carbide, moderate speeds, generous coolant.
Can S355J2WP be welded?
Weldable in thin sections only — the 0.06–0.15 % P raises hot-cracking risk, so keep heat input low, use low-hydrogen or matching Cr-Cu-Ni weathering consumables (e.g. E8018-W2 / 09CuPCrNi wire) and avoid heavy multi-pass restrained joints; single-pass fillets in ≤12 mm are the normal envelope.
Can S355J2WP be formed, bent or molded?
Good cold bending and roll forming in coil and ≤12 mm plate; keep bend radius ≥2t (≥2.5t transverse) and deburr edges, as P-rich steel is notch sensitive at low temperature.
S355J2WP 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 |
| Pdeliberate high P for patina formation; restricts weldability | 0.06 – 0.15 | 0.09 |
| S | ≤ 0.04 | 0.02 |
| Cu | 0.25 – 0.55 | 0.4 |
| Cr | 0.3 – 1.25 | 0.65 |
| Ni | ≤ 0.65 | 0.25 |
| Fe | balance |
What surface finishes work on S355J2WP?
Normally left bare to develop the patina (allow free drainage, no water traps, avoid contact with unprotected Al/Zn and de-icing salt); factory pre-rusting or wax/sealer limits runoff staining, and it also paints/powder-coats well after blast cleaning.
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 S355J2WP in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.8946
- Trade names
- Corten A
- Similar grades
- 09CuPCrNi-A
How much does S355J2WP cost?
S355J2WP 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.
S355J2WP — frequently asked
What is S355J2WP used for?
S355J2WP is typically used for exposed structural steelwork in cold climates, bridges, railway hopper cars and architectural facades. In short: −20 °C weathering steel; cold-climate Corten A variant; thin sections only when welded.
What is the yield strength of S355J2WP?
S355J2WP has a typical yield strength of 390 MPa (56.6 ksi) and a tensile strength of 530 MPa (76.9 ksi) — weaker than 64% of steel grades. Strength varies by condition: see the 3 listed tempers.
Is S355J2WP easy to machine?
Reasonably — machinability is rated good (62/100, better than 89% of steel grades). Machines like a 355 MPa HSLA steel; high phosphorus gives clean chip breaking, but tool wear rises slightly from Cr/Cu — use coated carbide, moderate speeds, generous coolant.
Can S355J2WP be welded?
With care — weldability is rated fair (50/100). Weldable in thin sections only — the 0.06–0.15 % P raises hot-cracking risk, so keep heat input low, use low-hydrogen or matching Cr-Cu-Ni weathering consumables (e.g. E8018-W2 / 09CuPCrNi wire) and avoid heavy multi-pass restrained joints; single-pass fillets in ≤12 mm are the normal envelope.
What surface finishes work on S355J2WP?
Normally left bare to develop the patina (allow free drainage, no water traps, avoid contact with unprotected Al/Zn and de-icing salt); factory pre-rusting or wax/sealer limits runoff staining, and it also paints/powder-coats well after blast cleaning.
Can S355J2WP be formed, bent or molded?
Good cold bending and roll forming in coil and ≤12 mm plate; keep bend radius ≥2t (≥2.5t transverse) and deburr edges, as P-rich steel is notch sensitive at low temperature.
What is the maximum service temperature of S355J2WP?
S355J2WP 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 S355J2WP +AR and S355J2WP-CR?
+AR is the default condition — default stock condition for weathering plate, coil and strip up to ~12–16 mm; pick unless a normalized certificate is demanded. CR: sub-3 mm decorative sheet for facade panels and signage; higher strength, reduced ductility, needs care on tight bends. Yield strength is 390 MPa in +AR versus 440 MPa in CR.
How much does S355J2WP cost?
S355J2WP 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) — SAC (2008)
- Weathering steel (Corten A/B) plate and coil datasheets — ArcelorMittal / SSAB / Baosteel (2022)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.13 — Corrosion (atmospheric corrosion of weathering steels) — ASM International (2005)
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.