Steel P355N
EN 1.0562, 10028-3
P355N is a normalized fine-grain non-alloy pressure vessel plate steel to EN 10028-3 (material 1.0562), with counterparts A516 Grade 70, SPV355 and Q345R.
Reference datasheet — P355N 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 N condition
P355N tempers and conditions
P355N is supplied in 6 conditions, soft to hard. N is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
N | Thick-section plate for heavy-wall shells; the guaranteed yield falls stepwise with thickness per EN 10028-3. | 330 | 520 | 25 | 155 HB | 9 % IACS |
normalized plus post-weld/stress-relief heat treatment (simulated) | Order when the fabricated vessel will see PWHT (≈550–620 °C) and the mill must certify properties after simulated heat treatment. | 370 | 525 | 27 | 152 HB | 9 % IACS |
NDefault Normalized | Standard normalized plate for ambient and moderately low temperature pressure vessels down to −20 °C. | 380 | 540 | 26 | 160 HB | 9 % IACS |
Normalized, guaranteed elevated-temperature properties | Pick when the vessel is designed above ~50 °C and a certified elevated-temperature proof strength (up to 400 °C) is required. | 385 | 545 | 24 | 162 HB | 9 % IACS |
Normalized, low-temperature toughness verified at −40 °C | Use for outdoor or refrigerated equipment where the minimum design metal temperature reaches −40 °C. | 385 | 545 | 25 | 160 HB | 9 % IACS |
Normalized, low-temperature toughness verified at −50 °C | Cleanest variant (lower P and S) for cryogenic-leaning service and thick sections needing the best notch toughness. | 390 | 545 | 26 | 160 HB | 9 % IACS |
What is P355N?
P355N is a normalized fine-grain non-alloy pressure vessel plate steel to EN 10028-3 (material 1.0562), with counterparts A516 Grade 70, SPV355 and Q345R. Engineers specify it for boiler drums, shells and heat exchangers because normalizing delivers 380 MPa yield, 540 MPa tensile and 26 % elongation at about 160 HB with good notch toughness in weldable plate. Service temperature is capped near 400 °C and the steel has no corrosion resistance, so blasting and coating, cladding or a corrosion allowance is required. Choose P355NH for guaranteed elevated-temperature values or P355NL1 for −40 °C toughness. P355N 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). P355N has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 68% of steel grades. Elongation at break is 26% and the elastic modulus is 210 GPa (30.5 Msi).
What is P355N used for?
- boiler drums
- pressure vessel shells
- storage tanks
- heat exchangers
Advantages
- Tough — resists crack growth — 140 MPa·√m (127.4 ksi·√in), better than 94% of steel grades
- Readily welded — 88/100, better than 87% of steel grades
- Forms and bends easily — 68/100, better than 83% of steel grades
- Ductile — tolerates forming and impact — 26%, better than 82% of steel grades
- Conducts heat well — 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades
Limitations
- Hard to polish — 45/100, worse than 84% of steel grades
P355N properties
Typical room-temperature values for P355N-N; bars are the position among steel grades.
Physical3
P355N 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
P355N has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 68% of steel grades. Elongation at break is 26% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
P355N is rated for continuous service to 400°C (752 °F). It conducts heat at 48 W/m·K (27.7 BTU/hr·ft·°F), better than 79% of steel grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
P355N conducts electricity at 9 % IACS, better than 71% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (11/100), worse than 73% of steel grades.
Sustainability4
Producing a kilogram of P355N takes about 25 MJ of energy and emits 2.1 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 25%.
Manufacturability8
P355N's machinability is good (58/100, better than 75% of steel grades); weldability excellent (88/100); formability good (68/100).
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. P355N is highlighted; hover a dot for its name, or open the interactive family chart.
Working with P355N
Is P355N easy to machine?
Machines like ordinary C-Mn plate at ~60 % of AISI 1212; use rigid setups and coolant on drilled nozzle holes, watch for stringy chips at low hardness.
Can P355N be welded?
Excellent weldability with CEV typically ≤0.43; SAW/SMAW/GMAW with low-hydrogen consumables, preheat 100–150 °C for thick sections and PWHT 550–620 °C when required by code.
Can P355N be formed, bent or molded?
Cold-forms readily into heads and shells (min bend radius ~1.5–2 t); hot forming 900–1000 °C must be followed by re-normalizing to restore fine grain and toughness.
P355N 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 for t ≤ 150 mm | ≤ 0.2 | 0.17 |
| Si | ≤ 0.5 | 0.35 |
| Mn | 1.1 – 1.7 | 1.4 |
| P≤0.025 for NL1, ≤0.020 for NL2 | ≤ 0.03 | 0.02 |
| S≤0.015 for NL1, ≤0.010 for NL2 | ≤ 0.03 | 0.01 |
| Altotal Al, grain refinement | ≥ 0.02 | 0.03 |
| Cr | ≤ 0.3 | 0.08 |
| Cu | ≤ 0.3 | 0.1 |
| Mo | ≤ 0.08 | 0.02 |
| Ni | ≤ 0.5 | 0.1 |
| NbNb+Ti+V ≤ 0.12 | ≤ 0.05 | 0.02 |
| Ti | ≤ 0.03 | 0.01 |
| V | ≤ 0.1 | 0.02 |
| Nlower for NL2 | ≤ 0.02 | 0.01 |
| Fe | balance |
What surface finishes work on P355N?
No anodizing — shot blast to Sa 2.5 then epoxy/zinc-rich paint, metallize or hot-dip galvanize; internal service usually lined or corrosion-allowance based.
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 P355N in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.056210028-3
- Similar grades
- A516 Grade 70SPV355Q345R
How much does P355N cost?
P355N 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.
P355N — frequently asked
What is P355N used for?
P355N is typically used for boiler drums, pressure vessel shells, storage tanks and heat exchangers. In short: baseline normalized vessel plate; good toughness, easy welding; 400 °C service ceiling.
What is the yield strength of P355N?
P355N has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 68% of steel grades. Strength varies by condition: see the 6 listed tempers.
Is P355N easy to machine?
Reasonably — machinability is rated good (58/100, better than 75% of steel grades). Machines like ordinary C-Mn plate at ~60 % of AISI 1212; use rigid setups and coolant on drilled nozzle holes, watch for stringy chips at low hardness.
Can P355N be welded?
Yes — weldability is rated excellent (88/100). Excellent weldability with CEV typically ≤0.43; SAW/SMAW/GMAW with low-hydrogen consumables, preheat 100–150 °C for thick sections and PWHT 550–620 °C when required by code.
What surface finishes work on P355N?
No anodizing — shot blast to Sa 2.5 then epoxy/zinc-rich paint, metallize or hot-dip galvanize; internal service usually lined or corrosion-allowance based.
Can P355N be formed, bent or molded?
Cold-forms readily into heads and shells (min bend radius ~1.5–2 t); hot forming 900–1000 °C must be followed by re-normalizing to restore fine grain and toughness.
What is the maximum service temperature of P355N?
P355N 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 P355N-N and P355N N-thick?
N is the default condition — standard normalized plate for ambient and moderately low temperature pressure vessels down to −20 °C. N-thick: thick-section plate for heavy-wall shells; the guaranteed yield falls stepwise with thickness per EN 10028-3. Yield strength is 380 MPa in N versus 330 MPa in N-thick.
How much does P355N cost?
P355N 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 10028-3: Flat products made of steels for pressure purposes — Weldable fine grain steels, normalized — CEN (2017)
- EN 10027-1/-2 designation and material number 1.0562 — CEN (2016)
- GB/T 713 Q345R steel plates for boilers and pressure vessels — SAC (2014)
- ASTM A516/A516M Grade 70 pressure vessel plate — ASTM (2021)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- EN 13445-2/-3/-4 Unfired pressure vessels — CEN (2021)
- Mysteel / SMM — Mysteel / SMM (2025)
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.