Steel P355ML1
EN 1.8832, 10028-6
P355ML1 (1.8832) is a thermomechanically rolled low-carbon C-Mn fine-grain pressure vessel plate to EN 10028-6, with L1-level toughness for sub-zero service down to -40 °C.
Reference datasheet — P355ML1 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 M condition
P355ML1 tempers and conditions
P355ML1 is supplied in 5 conditions, soft to hard. M is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
M | Upper thickness limit of the TM route; choose only where a Q&T grade (P355QL1) is not required. | 370 | 500 | 25 | 152 HB | 9 % IACS |
M | Heavy plate for thick-wall vessels and nozzle reinforcement; slightly lower guaranteed strength and toughness scatter. | 380 | 510 | 26 | 155 HB | 9 % IACS |
Stress relieved | Order this option when the vessel will be PWHT'd: properties are verified on simulated-PWHT samples, with a small loss of strength and Charpy energy. | 380 | 505 | 29 | 152 HB | 9 % IACS |
M | Medium-thickness shell and head plate; yield minimum drops one step with thickness. | 390 | 515 | 27 | 158 HB | 9 % IACS |
MDefault Thermomechanically controlled processed | Standard as-delivered thermomechanically rolled plate for the thinnest and most-stocked thickness class; full 355 MPa yield with −40 °C impact guarantee. | 400 | 520 | 28 | 160 HB | 9 % IACS |
Supply forms, finishes and certifications
Ways P355ML1 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
Z35 | Through-thickness ductility class | Certification |
What is P355ML1?
P355ML1 (1.8832) is a thermomechanically rolled low-carbon C-Mn fine-grain pressure vessel plate to EN 10028-6, with L1-level toughness for sub-zero service down to -40 °C. It gives 400 MPa yield, 520 MPa tensile and 28 % elongation with a low carbon equivalent, and is stocked as plate in M, stress-relieved (SR) and Z35 through-thickness conditions to 80 mm. Hot forming or normalizing above about 580 °C destroys the TMCP condition and requires requalification, and the bare surface has no corrosion resistance. Service is limited to 400 °C; use P355ML2 for -50 °C duty or P355QL1 where hot forming is unavoidable. P355ML1 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). P355ML1 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 60% of steel grades. Elongation at break is 28% and the elastic modulus is 210 GPa (30.5 Msi).
What is P355ML1 used for?
- low-temperature vessels
- gas storage tanks
- chemical process equipment
Advantages
- Ductile — tolerates forming and impact — 28%, better than 89% of steel grades
- Tough — resists crack growth — 130 MPa·√m (118.3 ksi·√in), better than 89% of steel grades
- Readily welded — 88/100, better than 87% 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
P355ML1 properties
Typical room-temperature values for P355ML1-M; bars are the position among steel grades.
Physical3
P355ML1 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
P355ML1 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 60% of steel grades. Elongation at break is 28% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
P355ML1 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
P355ML1 conducts electricity at 9 % IACS, better than 71% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of P355ML1 takes about 25 MJ of energy and emits 2 kg of CO₂ — less than 82% of steel grades. Typical recycled content is 25%.
Manufacturability7
P355ML1's machinability is good (60/100, better than 83% of steel grades); weldability excellent (88/100); 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. P355ML1 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with P355ML1
Is P355ML1 easy to machine?
Machines like normalized C-Mn plate at ~65 % of AISI 1212; sticky chips, use positive-rake carbide, moderate speed and generous coolant to avoid built-up edge.
Can P355ML1 be welded?
Excellent weldability with low CEV — SAW/GMAW/SMAW with basic, low-hydrogen consumables matching −40 °C toughness; keep heat input and interpass temperature controlled (typically ≤ 250 °C) so the thermomechanical fine grain and HAZ toughness are preserved.
Can P355ML1 be formed, bent or molded?
Good cold formability for rolling shells and pressing heads; hot forming above ~580 °C or normalizing destroys the TM condition and requires re-qualification (or use of the Q&T grade P355QL1).
P355ML1 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 |
|---|---|---|
| Ccast analysis limit | ≤ 0.16 | 0.1 |
| Si | ≤ 0.5 | 0.3 |
| Mn | 1 – 1.7 | 1.4 |
| P | ≤ 0.03 | 0.01 |
| Slower S usually supplied for low-temperature toughness / Z quality | ≤ 0.02 | 0.01 |
| Altotal Al, grain refinement | ≥ 0.02 | 0.04 |
| N | ≤ 0.02 | 0.01 |
| Nbmicroalloy; Nb+V+Ti ≤ 0.22 | ≤ 0.05 | 0.03 |
| V | ≤ 0.1 | 0.04 |
| Ti | ≤ 0.05 | 0.02 |
| Crresidual | ≤ 0.3 | 0.05 |
| Niaids low-temperature toughness | ≤ 0.5 | 0.15 |
| Curesidual | ≤ 0.3 | 0.1 |
| Moresidual | ≤ 0.1 | 0.02 |
| FeCEV (IIW) typically ≤ 0.43 % | balance |
What surface finishes work on P355ML1?
No anodizing; shot-blast to Sa 2½ and apply epoxy/zinc-rich paint, metallize or thermal-spray; hot-dip galvanizing possible but check embrittlement and coating temperature effects.
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 P355ML1 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.883210028-6
How much does P355ML1 cost?
P355ML1 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.
P355ML1 — frequently asked
What is P355ML1 used for?
P355ML1 is typically used for low-temperature vessels, gas storage tanks and chemical process equipment. In short: weldable -40 °C vessel plate; high 28 % elongation; lower-strength ML1 workhorse.
What is the yield strength of P355ML1?
P355ML1 has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 520 MPa (75.4 ksi) — weaker than 60% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is P355ML1 easy to machine?
Reasonably — machinability is rated good (60/100, better than 83% of steel grades). Machines like normalized C-Mn plate at ~65 % of AISI 1212; sticky chips, use positive-rake carbide, moderate speed and generous coolant to avoid built-up edge.
Can P355ML1 be welded?
Yes — weldability is rated excellent (88/100). Excellent weldability with low CEV — SAW/GMAW/SMAW with basic, low-hydrogen consumables matching −40 °C toughness; keep heat input and interpass temperature controlled (typically ≤ 250 °C) so the thermomechanical fine grain and HAZ toughness are preserved.
What surface finishes work on P355ML1?
No anodizing; shot-blast to Sa 2½ and apply epoxy/zinc-rich paint, metallize or thermal-spray; hot-dip galvanizing possible but check embrittlement and coating temperature effects.
Can P355ML1 be formed, bent or molded?
Good cold formability for rolling shells and pressing heads; hot forming above ~580 °C or normalizing destroys the TM condition and requires re-qualification (or use of the Q&T grade P355QL1).
What is the maximum service temperature of P355ML1?
P355ML1 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 P355ML1-M and P355ML1 M-63-80?
M is the default condition — standard as-delivered thermomechanically rolled plate for the thinnest and most-stocked thickness class; full 355 MPa yield with −40 °C impact guarantee. M-63-80: upper thickness limit of the TM route; choose only where a Q&T grade (P355QL1) is not required. Yield strength is 400 MPa in M versus 370 MPa in M-63-80.
How much does P355ML1 cost?
P355ML1 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 10028-5 — Flat products made of steels for pressure purposes, Part 5: Weldable fine grain steels, thermomechanically rolled — CEN (2017)
- EN 10164 — Steel products with improved deformation properties perpendicular to the surface — CEN (2018)
- EN 10027-2 — Designation systems for steels: Numerical system (1.8832) — CEN (2015)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Thermomechanically rolled pressure vessel plate (P355M/ML1/ML2) datasheets — European plate mills (e.g. Dillinger, Voestalpine, SSAB) (2022)
- (16MnDR/P355ML1) — Mysteel / 1688 (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.